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steam Flashcards

1
Q

Two identical pressurizers are connected to the same location on two identical reactor coolant systems
operating at 1,000 psia. Pressurizer A volume contains 50 percent saturated water and 50 percent
saturated steam. Pressurizer B volume contains 50 percent subcooled water (at 300°F) and 50 percent
nitrogen.
Which pressurizer will maintain the higher pressure following a sudden 10 percent liquid outsurge
from each pressurizer, and why?

A. Pressurizer A due to vaporizing of saturated water as pressure begins to decrease.
B. Pressurizer A due to the expansion characteristics of saturated steam being better than the
expansion characteristics of nitrogen.
C. Pressurizer B due to the subcooled water removing a relatively small amount of energy during the
outsurge.
D. Pressurizer B due to the expansion characteristics of nitrogen being better than the expansion
characteristics of saturated steam.

A

. Pressurizer A due to vaporizing of saturated water as pressure begins to decrease

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2
Q

Two identical pressurizers are connected to the same location on two identical reactor coolant systems
operating at 1,000 psia. Pressurizer A volume contains 50 percent subcooled water (at 300°F) and 50
percent nitrogen. Pressurizer B volume contains 50 percent saturated water and 50 percent saturated
steam.

Which pressurizer will maintain the higher pressure during a sudden 10 percent liquid outsurge from
each pressurizer, and why?

A. Pressurizer A due to the subcooled water removing a relatively small amount of energy during the
outsurge.

B. Pressurizer A due to the expansion characteristics of nitrogen being better than the expansion
characteristics of saturated steam.

C. Pressurizer B due to vaporizing of saturated water as pressure begins to decrease.

D. Pressurizer B due to the expansion characteristics of saturated steam being better than the
expansion characteristics of nitrogen.

A

Pressurizer B due to vaporizing of saturated water as pressure begins to decrease.

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3
Q

A reactor is operating normally at 100 percent power. Reactor coolant enters the reactor vessel at a
temperature of 556°F and a total flow rate of 320,000 gpm. The reactor coolant leaves the reactor
vessel at 612°F.
What is the approximate flow rate of the reactor coolant leaving the reactor vessel?
A. 320,000 gpm
B. 330,000 to 339,000 gpm
C. 340,000 to 349,000 gpm
D. 350,000 to 359,000 gpm

A

D. 350,000 to 359,000 gpm

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4
Q

A liquid is saturated with 0 percent quality. Assuming pressure remains constant, the addition of a
small amount of heat will…

A. raise the steady-state liquid temperature above the boiling point.

B. result in a subcooled liquid.

C. result in some of the liquid vaporizing.

D. result in a superheated liquid.

A

result in some of the liquid vaporizing.

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5
Q

A pressurizer is operating in a saturated condition at 636°F. If a sudden 10 percent liquid outsurge
occurs, pressurizer pressure will __________; and pressurizer temperature will __________.

A. remain the same; decrease

B. remain the same; remain the same

C. decrease; decrease

D. decrease; remain the same

A

decrease; decrease

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6
Q

Consider a saturated steam-water mixture with a quality of 99 percent. If pressure remains constant
and heat is removed from the mixture, the temperature of the mixture will __________; and the quality
of the mixture will __________. (Assume the mixture remains saturated.)

A. decrease; increase

B. decrease; decrease

C. remain the same; increase

D. remain the same; decrease

A

remain the same; decrease

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7
Q

A nuclear power plant is shut down with the pressurizer in a saturated condition as follows:
Pressurizer liquid temperature = 588°F
Pressurizer vapor temperature = 588°F
Pressurizer pressure
= 1,410 psia
If the pressurizer is vented until pressure equals 1,200 psia, pressurizer liquid temperature will…

A. increase due to condensation of vapor.

B. increase due to evaporation of liquid.

C. decrease due to condensation of vapor.

D. decrease due to evaporation of liquid.

A

decrease due to evaporation of liquid.

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8
Q

Which one of the following describes saturated water at atmospheric pressure?

A. At the critical point.

B. Below the boiling point.

C. At the boiling point.

D. A quality of 100 percent.

A

At the boiling point.

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9
Q

A steam-water mixture is initially saturated with a quality of 95 percent when a small amount of heat is
added to the mixture. If the mixture remains saturated and pressure remains constant, the temperature
of the mixture will __________; and the quality of the mixture will __________.

A. increase; remain the same

B. increase; increase

C. remain the same; remain the same

D. remain the same; increase

A

remain the same; increase

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10
Q

An open container holds 1.0 lbm of saturated water at standard atmospheric pressure. The addition of
1.0 Btu to the water will…

A. raise the temperature of the water by 1°F.

B. vaporize a portion of the water.

C. increase the density of the water.

D. result in 1°F of superheat.

A

vaporize a portion of the water.

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11
Q

Consider a saturated steam-water mixture with a quality of 79 percent. If pressure remains constant
and heat is added to the mixture, the temperature of the mixture will __________; and the quality of
the mixture will __________. (Assume the mixture remains saturated.)

A. increase; increase

B. increase; remain the same

C. remain the same; increase

D. remain the same; remain the same

A

remain the same; increase

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12
Q

A nuclear power plant is shut down with the pressurizer in a saturated condition as follows:
Pressurizer liquid temperature = 588°F
Pressurizer vapor temperature = 588°F
Pressurizer pressure
= 1,410 psia
Pressurizer spray is initiated to lower pressurizer pressure to 1,350 psia. When pressurizer pressure
stabilizes at 1,350 psia, liquid temperature will be __________; and vapor temperature will be
__________.

A. the same; the same

B. the same; lower

C. lower; the same

D. lower; lower

A

lower; lower

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13
Q

A steam-water mixture is initially saturated with a quality of 50 percent when a small amount of heat is
added. If pressure remains constant and the mixture remains saturated, mixture steam quality will
__________; and mixture temperature will __________.

A. increase; increase

B. increase; remain the same

C. remain the same; increase

D. remain the same; remain the same

A

increase; remain the same

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14
Q

Which one of the following is the approximate quality of a saturated steam-water mixture at 467°F
with an enthalpy of 1,000 Btu/lbm?

A. 24 percent

B. 27 percent

C. 73 percent

D. 76 percent

A

73 percent

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15
Q

Consider a saturated steam-water mixture at 500°F with a quality of 90 percent. If the pressure of the
mixture is decreased with no heat gain or loss, the temperature of the mixture will __________; and
the quality of the mixture will __________. (Assume the mixture remains saturated.)

A. decrease; decrease

B. decrease; increase

C. remain the same; decrease

D. remain the same; increase

A

decrease; increase

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16
Q

Consider a pressurizer containing a saturated steam-water mixture at 636°F with a quality of 15
percent. If an outsurge removes 10 percent of the liquid volume from the pressurizer, the temperature
of the remaining mixture will __________, and the quality of the remaining mixture will __________.
(Assume the mixture remains saturated.)

A. decrease; decrease

B. decrease; increase

C. remain the same; decrease

D. remain the same; increase

A

decrease; increase

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17
Q

Which one of the following describes the effect of removing heat from a saturated steam-water
mixture that remains in a saturated condition?

A. Temperature will increase.

B. Temperature will decrease.

C. Quality will increase.

D. Quality will decrease.

A

Quality will decrease.

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18
Q

A nuclear power plant is shut down with the pressurizer in a saturated condition as follows:
Pressurizer liquid temperature = 588°F
Pressurizer vapor temperature = 588°F
Pressurizer pressure
= 1,410 psia
Pressurizer heaters are energized to raise pressurizer pressure to 1,450 psia. When pressurizer
pressure stabilizes at 1,450 psia, liquid temperature will be __________ and vapor temperature will be
__________.

A. the same; the same

B. the same; higher

C. higher; the same

D. higher; higher

A

higher; higher

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19
Q

An open container holds 1.0 lbm of saturated water at standard atmospheric pressure. The addition of
4.0 Btu will…

A. result in 4°F of superheat.

B. vaporize a portion of the water.

C. increase the density of the water.

D. raise the temperature of the water by 4°F.

A

vaporize a portion of the water.

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20
Q

Consider a sealed vessel containing 1,000 lbm of a saturated steam-water mixture at 500°F. The
vessel is perfectly insulated with no heat gain or loss occurring.
If a leak near the bottom of the vessel results in a loss of 10 percent of the liquid volume from the
vessel, the temperature of the mixture will __________; and the overall quality of the mixture will
__________. (Assume the mixture remains saturated.)

A. decrease; increase

B. decrease; decrease

C. remain the same; increase

D. remain the same; decrease

A

decrease; increase

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21
Q

Given the following:
* A saturated steam-water mixture with an inlet quality of 60 percent is flowing through a
moisture separator.
* The moisture separator is 100 percent efficient for removing moisture.
How much moisture will be removed by the moisture separator from 50 lbm of the steam-water
mixture?

A. 10 lbm

B. 20 lbm

C. 30 lbm

D. 40 lbm

A

20 lbm

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22
Q

Given the following:
* A saturated steam-water mixture with an inlet quality of 40 percent is flowing through a
moisture separator.
* The moisture separator is 100 percent efficient for removing water.
How much water will be removed by the moisture separator from 50 lbm of the steam-water mixture?

A. 10 lbm

B. 20 lbm

C. 30 lbm

D. 40 lbm

A

30 lbm

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23
Q

A vapor having a temperature above its saturation temperature is a…

A. saturated vapor.

B. superheated vapor.

C. dry saturated vapor.

D. wet saturated vapor.

A

superheated vapor.

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24
Q

A reactor trip occurred 10 minutes ago due to a loss of coolant accident. Emergency coolant injection
is in progress and pressurizer level is increasing. Current pressurizer conditions are as follows:
Pressurizer liquid temperature = 568°F
Pressurizer vapor temperature = 596°F
Pressurizer pressure
= 1,410 psia
Pressurizer level
= 60 percent
Given these conditions, the pressurizer liquid is __________; and the pressurizer vapor is
__________.

A. saturated; saturated

B. saturated; superheated

C. subcooled; saturated

D. subcooled; superheated

A

subcooled; superheated

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25
Q

Consider 1.0 lbm of dry saturated steam at 200 psia. If pressure does not change, which one of the
following will be caused by the addition of 6.0 Btu to the steam?

A. The steam will remain saturated at the same temperature.

B. The steam will become superheated at the same temperature.

C. The steam will remain saturated at a higher temperature.

D. The steam will become superheated at a higher temperature.

A

The steam will become superheated at a higher temperature.

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26
Q

An open vessel contains 1.0 pound-mass of water at 206°F and standard atmospheric pressure.
Which one of the following will be caused by the addition of 3.0 Btu to the water?

A. The water temperature will rise by approximately 3°F.

B. Approximately 3 percent of the water mass will vaporize.

C. The water density will decrease by approximately 3 percent.

D. The water will become superheated by approximately 3°F.

A

The water temperature will rise by approximately 3°F.

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27
Q

A reactor is shut down with reactor coolant system (RCS) pressure at 1,500 psia and core decay heat is
being removed via the steam generators (SGs). What pressure must be maintained in the SGs to
obtain a 110°F subcooling margin in the reactor coolant leaving the SGs? (Assume the reactor
coolant leaves the SGs at the SG saturation temperature.)

A. 580 psia

B. 600 psia

C. 620 psia

D. 640 psia

A

600 psia

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28
Q

A reactor is shut down with reactor coolant system (RCS) pressure at 1,000 psia and core decay heat is
being removed via the steam generators (SGs). What pressure must be maintained in the SGs to
obtain a 50°F subcooling margin in the reactor coolant leaving the SGs? (Assume the reactor coolant
leaves the SGs at the SG saturation temperature.)

A. 550 psia

B. 600 psia

C. 650 psia

D. 700 psia

A

650 psia

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29
Q

Which one of the following will increase the subcooling of the condensate in the main condenser
hotwell?

A. Isolate circulating water to one shell of the main condenser.

B. Increase circulating water inlet temperature.

C. Decrease circulating water flow rate.

D. Decrease main turbine steam flow rate.

A

Decrease main turbine steam flow rate.

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30
Q

Given a set of steam tables that lists the following parameters for saturated steam and water:
* Pressure
* Enthalpy
* Specific volume
* Entropy
* Temperature
One can determine the __________ of a saturated steam-water mixture given only the __________.

A. temperature; enthalpy

B. temperature; pressure

C. pressure; entropy

D. pressure; specific volume

A

temperature; pressure

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31
Q

A nuclear power plant experienced a loss of all AC electrical power due to a natural disaster. A few
days later, there is turbulent boiling throughout the entire spent fuel pool. Average spent fuel
assembly temperature is elevated but stable. Assume that the spent fuel pool contains pure water in
thermal equilibrium, and that boiling is the only means of heat removal from the spent fuel pool.
Given the following stable current conditions:
Spent fuel decay heat rate = 4.8 MW
Spent fuel building pressure = 14.7 psia
At what approximate rate is the mass of water in the spent fuel pool decreasing?

A. 4,170 lbm/hr

B. 4,950 lbm/hr

C. 14,230 lbm/hr

D. 16,870 lbm/hr

A

16,870 lbm/hr

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32
Q

Given the following initial conditions for a spent fuel pool:
Spent fuel decay heat rate
= 5.0 MW
Spent fuel pool water temperature = 90°F
Spent fuel pool water mass
= 2.5 x 106 lbm
Spent fuel pool water specific heat = 1.0 Btu/lbm-°F
If a complete loss of spent fuel pool cooling occurs, how long will it take for spent fuel pool water
temperature to reach 212°F? (Assume the spent fuel pool remains in thermal equilibrium, and there is
no heat removal from the spent fuel pool.)

A. 18 hours

B. 31 hours

C. 48 hours

D. 61 hours

A

18 hours

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33
Q

Which one of the following is the approximate reactor coolant system subcooling margin when reactor
coolant temperature is 280°F and pressurizer pressure is 400 psig?

A. 165°F

B. 168°F

C. 265°F

D. 268°F

A

168°F

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34
Q

Given the following reactor coolant system (RCS) parameters, what is the RCS subcooling margin?
RCS pressure
= 2,235 psig
RCS hot leg temperature = 610°F

A. 25°F

B. 31°F

C. 38°F

D. 43°F

A

43°F

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35
Q

The saturation pressure for water at 328°F is approximately…

A. 85 psig.

B. 100 psig.

C. 115 psig.

D. 130 psig

A

85 psig.

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36
Q

What is the approximate enthalpy of a saturated steam-water mixture at 130°F with a quality of 90
percent?

A. 1,015 Btu/lbm

B. 1,093 Btu/lbm

C. 1,118 Btu/lbm

D. 1,216 Btu/lbm

A

1,015 Btu/lbm

37
Q

The following steady-state 100 percent power conditions existed just prior to a plant shutdown for
maintenance:
RCS Tave = 573.5°F
SG Tstm = 513.5°F
During the shutdown, 5 percent of the total steam generator (SG) tubes were plugged. Upon
completion of the maintenance, the plant was returned to 100 percent power with RCS mass flow rate
and RCS temperatures unchanged.
Which one of the following is the approximate current SG steam pressure with the plant at 100 percent
power?

A. 711 psia

B. 734 psia

C. 747 psia

D. 762 psia

A

747 psia

38
Q

Main condenser hotwell condensate is 4°F subcooled at a temperature of 112°F. What is the main
condenser pressure?

A. 1.78 psia

B. 1.51 psia

C. 1.35 psia

D. 1.20 psia

A

1.51 psia

39
Q

For steam at 230 psia and 900°F, what is the approximate amount of superheat?

A. 368°F

B. 393°F

C. 506°F

D. 535°F

A

506°F

40
Q

Which one of the following is the approximate temperature of a saturated steam-water mixture that has
an enthalpy of 1,150 Btu/lbm and a quality of 95 percent?

A. 220°F

B. 270°F

C. 360°F

D. 440°F

A

360°F

41
Q

What is the approximate amount of heat required to convert 3.0 lbm of water at 100°F and 100 psia to
dry saturated steam at 100 psia?

A. 889 Btu

B. 1,119 Btu

C. 2,666 Btu

D. 3,358 Btu

A

3,358 Btu

42
Q

Dry saturated steam undergoes an ideal expansion process in an ideal turbine from 1,000 psia to 28
inches Hg vacuum. Approximately how much specific work is being performed by the turbine?

A. 1,193 Btu/lbm

B. 805 Btu/lbm

C. 418 Btu/lbm

D. 388 Btu/lbm

A

418 Btu/lbm

43
Q

A saturated steam-water mixture with a quality of 30 percent leaves a main turbine at 1.0 x 106 lbm/hr
and enters a steam condenser at 2.0 psia. Condensate enters the hotwell at 118°F.
Which one of the following is the approximate condenser heat transfer rate?

A. 3.1 x 108 Btu/hr

B. 5.8 x 108 Btu/hr

C. 7.2 x 108 Btu/hr

D. 9.9 x 108 Btu/hr

A

3.1 x 108 Btu/hr

44
Q

Which one of the following is the approximate amount of heat required to convert 2.0 lbm of water at
100°F and 100 psia to dry saturated steam at 100 psia?

A. 1,119 Btu

B. 1,187 Btu

C. 2,238 Btu

D. 2,374 Btu

A

2,238 Btu

45
Q

A steam line is carrying steam at 500 psia and 507°F. Approximately how much specific ambient
heat loss is required before moisture formation can occur in the steam line?

A. 31 Btu/lbm

B. 45 Btu/lbm

C. 58 Btu/lbm

D. 71 Btu/lbm

A

31 Btu/lbm

46
Q

Which one of the following is the approximate amount of heat required to convert 2.0 lbm of water at
100°F and 100 psia to superheated steam at 400°F and 100 psia?

A. 930 Btu

B. 1,160 Btu

C. 1,860 Btu

D. 2,320 Btu

A

2,320 Btu

47
Q

What is the approximate specific heat (Btu/lbm-°F) of water at 300°F and 100 psia?

A. 1.03 Btu/lbm-°F

B. 1.11 Btu/lbm-°F

C. 1.17 Btu/lbm-°F

D. 1.25 Btu/lbm-°F

A

1.03 Btu/lbm-°F

48
Q

With a nuclear power plant operating near rated power, air inleakage into the main condenser causes
main condenser pressure to increase from 1.0 psia to 2.0 psia.
Given the following:
* Initial main condenser condensate depression was 4°F.
* After the plant stabilizes, main condenser condensate depression is 2°F with main condenser
pressure at 2.0 psia.
Which one of the following is the approximate increase in main condenser specific heat rejection
needed to restore condensate depression to 4°F?

A. 2 Btu/lbm

B. 4 Btu/lbm

C. 8 Btu/lbm

D. 16 Btu/lbm

A

2 Btu/lbm

49
Q

Given the following:
* A nuclear power plant is operating near rated power.
* The main turbine is comprised of a single unit with no reheat.
* Main turbine inlet steam conditions are 900 psia and 100 percent quality.
* Ideal steam expansion is occurring in the main turbine.
* Main condenser pressure is 1.0 psia.
Which one of the following is the approximate main condenser specific heat rejection needed to
establish condensate depression at 4°F?

A. 716 Btu/lbm

B. 782 Btu/lbm

C. 856 Btu/lbm

D. 1,132 Btu/lbm

A

716 Btu/lbm

50
Q

The temperature of a saturated steam-water mixture is 467°F.
Which one of the following parameter values, when paired with the temperature, provides insufficient
information to determine the quality of the mixture?

A. Pressure is 499.96 psia.

B. Enthalpy is 977.33 Btu/lbm.

C. Entropy is 1.17 Btu/lbm -°R.

D. Specific volume is 0.817 ft3
/lbm

A

Pressure is 499.96 psia.

51
Q

A steam line is carrying dry saturated steam at 500 psia. Approximately how much heat addition to
the steam is necessary to achieve 60°F of superheat?

A. 31 Btu/lbm

B. 45 Btu/lbm

C. 58 Btu/lbm

D. 71 Btu/lbm

A

45 Btu/lbm

52
Q

An ideal main turbine generator (MTG) is producing 1,000 MW of electrical power while being
supplied with 100 percent quality steam at 920 psig. Steam supply pressure is then gradually
increased to 980 psig at the same quality. Assume turbine control valve position and condenser
vacuum remain the same.
Which one of the following describes why the MTG output increases as steam pressure increases?

A. Each lbm of steam entering the turbine has a higher specific heat.

B. Each lbm of steam entering the turbine has a higher specific enthalpy.

C. Each lbm of steam passing through the turbine expands to fill a greater volume.

D. Each lbm of steam passing through the turbine performs increased work in the turbine.

A

Each lbm of steam passing through the turbine performs increased work in the turbine.

53
Q

Which one of the following is the approximate amount of heat required to convert 2.0 lbm of water at
100°F and 100 psia to dry saturated steam at 100 psia?

A. 560 Btu

B. 1,120 Btu

C. 2,238 Btu

D. 3,356 Btu

A

2,238 Btu

54
Q

The following steady-state 100 percent power conditions existed just prior to a plant shutdown for
maintenance:
RCS Tave = 572°F
SG Tstm = 534°F
During the shutdown, 5 percent of the total steam generator (SG) tubes were plugged. Which one of
the following will be the approximate SG steam pressure when the plant is returned to 100 percent
power? (Assume RCS mass flow rate and RCS Tave are the same as their pre-shutdown 100 percent
power values.)

A. 813 psia

B. 841 psia

C. 870 psia

D. 900 psia

A

900 psia

55
Q

A 100 ft3 vessel contains a saturated steam-water mixture at 1,000 psia. The water portion occupies
30 ft3 and the steam portion occupies the remaining 70 ft3
. What is the approximate total mass of the
mixture in the vessel?

A. 1,547 lbm

B. 2,612 lbm

C. 3,310 lbm

D. 4,245 lbm

A

1,547 lbm

56
Q

A nuclear power plant has been operating at full power for six months when a sustained station
blackout occurs, resulting in a reactor trip and a complete loss of forced reactor coolant circulation.
All means of reactor coolant injection and steam generator heat removal are unavailable. Reactor
coolant system (RCS) pressure is being maintained at approximately 2,100 psia by operation of the
pressurizer relief valves.
The following conditions exist five minutes after the reactor trip:
RCS pressure
= 2,100 psia
Core exit thermocouple (CET) temperature = 550°F
With RCS pressure constant at 2,100 psia, which one of the following describes the future response of
the CET temperature indication?

A. CET indication will remain stable at approximately 550°F until the core becomes uncovered; then,
CET indication will become erratic.

B. CET indication will remain stable at approximately 550°F until the core becomes uncovered; then,
CET indication will increase to approximately 643°F where it will become erratic.

C. CET indication will steadily increase to approximately 643°F and stabilize; then, as the core
begins to uncover, CET indication will increase further until it becomes erratic.

D. CET indication will steadily increase until it becomes erratic.

A

CET indication will steadily increase to approximately 643°F and stabilize; then, as the core
begins to uncover, CET indication will increase further until it becomes erratic.

57
Q

Main steam is being used to reheat high pressure (HP) turbine exhaust in a moisture separator-reheater
(MSR).
Given:
* The HP turbine exhaust enters the MSR reheater section as dry saturated steam.
* The exhaust enters and exits the reheater section at 280 psia and a flow rate of 1.0E6 lbm/hr.
* The main steam heat transfer rate in the reheater section is 42.1E6 Btu/hr.
Which one of the following is the approximate temperature of the HP turbine exhaust leaving the
reheater section of the MSR?

A. 450°F

B. 475°F

C. 500°F

D. 525°F

A

475°F

58
Q

A saturated steam-water mixture at 50 percent quality is leaving a main turbine at 1.0 x 106 lbm/hr and
entering a condenser at 1.6 psia. Condensate enters the hotwell at 112°F.
Which one of the following is the approximate condenser heat transfer rate?

A. 3.1 x 108 Btu/hr

B. 3.8 x 108 Btu/hr

C. 4.5 x 108 Btu/hr

D. 5.2 x 108 Btu/hr

A

5.2 x 108 Btu/hr

59
Q

A nuclear power plant is operating at 100 percent power. The main turbine has one high pressure
(HP) unit and one low pressure (LP) unit.
Main steam enters the HP unit of the main turbine with the following parameters:
Pressure = 1,000 psia
Quality = 100 percent
The exhaust steam exits the HP unit at 200 psia, then goes through a moisture separator-reheater, and
enters the LP units with the following parameters:
Pressure
= 200 psia
Temperature = 500°F
The main condenser pressure is 1.0 psia. Assume that each unit of the main turbine is 100 percent
efficient.
The higher enthalpy steam is being supplied to the __________ unit of the main turbine; and the
greater moisture content is found in the exhaust of the __________ unit.
A. LP; LP

B. LP; HP

C. HP; LP

D. HP; HP

A

LP; LP

60
Q

Consider a 100 lbm quantity of a saturated steam-water mixture at standard atmospheric pressure.
The mixture has a quality of 70 percent. Assume that pressure remains constant and there is no heat
loss from the mixture.
Which one of the following is the approximate heat addition needed to increase the quality of the
mixture to 100 percent?

A. 5,400 Btu

B. 12,600 Btu

C. 29,100 Btu

D. 67,900 Btu

A

29,100 Btu

61
Q

An open vessel contains 1.0 lbm-mass of water at 204°F and standard atmospheric pressure. If 16.0
Btu of heat is added to the water, the water temperature will rise by about __________; and
approximately __________ of the water mass will become steam.

A. 8°F; 1 percent

B. 8°F; 10 percent

C. 16°F; 1 percent

D. 16°F; 10 percent

A

8°F; 1 percent

62
Q

Water enters an ideal convergent-divergent nozzle with the following parameters:
Pressure = 300 psia
Temperature= 102°F
Velocity = 50 ft/sec
The velocity of the water at the throat of the nozzle is 200 ft/sec.
Given that nozzles convert enthalpy to kinetic energy, and assuming no heat transfer to or from the
nozzle, what is the approximate pressure of the water at the throat of the nozzle?

A. 296 psia

B. 150 psia

C. 75 psia

D. 50 psia

A

50 psia

63
Q

An open vessel contains 1 lbm of water at 206°F and standard atmospheric pressure. If 12 Btu is
added to the water, the water temperature will rise by about __________; and __________ of the
water will vaporize.

A. 6°F; none

B. 6°F; some

C. 12°F; none

D. 12°F; some

A

6°F; some

64
Q

A feedwater pump discharges into a 16-inch diameter discharge line. Given the following:
Pump discharge pressure = 950 psia
Feedwater temperature = 300°F
Feedwater velocity
= 15.2 ft/sec
What is the feedwater pump discharge mass flow rate?

A. 1.1 x 106 lbm/hr

B. 4.4 x 106 lbm/hr

C. 1.8 x 107 lbm/hr

D. 5.3 x 107 lbm/hr

A

4.4 x 106 lbm/hr

65
Q

Dry saturated steam enters a frictionless convergent-divergent nozzle with the following parameters:
Pressure = 850 psia
Velocity = 10 ft/sec
The steam at the throat of the nozzle has a subsonic velocity of 950 ft/sec.
Given that nozzles convert enthalpy to kinetic energy, and assuming no heat transfer to or from the
nozzle, what is the enthalpy of the steam at the throat of the nozzle?

A. 1,162 Btu/lbm

B. 1,171 Btu/lbm

C. 1,180 Btu/lbm

D. 1,189 Btu/lbm

A

1,180 Btu/lbm

66
Q

An ideal auxiliary steam turbine exhausts to the atmosphere. The steam turbine is supplied with dry
saturated steam at 900 psia. Which one of the following is the maximum specific work (Btu/lbm) that
can be extracted from the steam by the steam turbine?

A. 283 Btu/lbm

B. 670 Btu/lbm

C. 913 Btu/lbm

D. 1,196 Btu/lbm

A

283 Btu/lbm

67
Q

An ideal steam turbine exhausts to a steam condenser at 1.0 psia. The turbine is driven by dry
saturated steam at 600 psia. What is the work (Btu/hr) of the steam turbine if the turbine steam flow
rate is 200,000 lbm/hr?

A. 7.9 x 106 Btu/hr

B. 1.6 x 107 Btu/hr

C. 7.9 x 107 Btu/hr

D. 1.6 x 108 Btu/hr

A

7.9 x 107 Btu/hr

68
Q

A steam turbine exhausts to a steam condenser at 1.0 psia. The steam turbine is supplied with dry
saturated steam at 900 psia at a flow rate of 200,000 lbm/hr. What is the approximate rate of
condensate addition to the condenser hotwell in gallons per minute?

A. 400 gpm

B. 2,400 gpm

C. 4,000 gpm

D. 24,000 gpm

A

400 gpm

69
Q

What happens to the enthalpy of the saturated steam in a steam generator (SG) as heat addition
increases SG pressure from 100 psia to 1,000 psia?

A. The enthalpy increases during the entire pressure increase.

B. The enthalpy initially increases and then decreases.

C. The enthalpy decreases during the entire pressure increase.

D. The enthalpy initially decreases and then increases.

A

The enthalpy initially increases and then decreases.

70
Q

Water enters a positive displacement pump at 50 psig and 90°F. What is the available net positive
suction head for the pump?

A. 80 feet

B. 114 feet

C. 133 feet

D. 148 feet

A

148 feet

71
Q

Dry saturated steam is flowing through a reheater. The reheater inlet and outlet pressures are both
260 psia. If the reheater adds 60.5 Btu/lbm to the steam, what is the temperature of the steam exiting
the reheater?

A. 405°F

B. 450°F

C. 465°F

D. 500°F

A

500°F

72
Q

An open vessel contains 5.0 lbm of saturated water at standard atmospheric pressure. If an additional
1,600 Btu is added to the water, the water temperature will __________, and __________ than 50
percent of the water will vaporize.

A. increase significantly; less

B. increase significantly; more

C. remain about the same; less

D. remain about the same; more

A

remain about the same; less

73
Q

Dry saturated steam at 240 psia enters an ideal low pressure (LP) turbine and exhausts to a steam
condenser at 1.0 psia. Compared to the LP turbine entry conditions, the volumetric flow rate of the
steam leaving the LP turbine will be about __________ times larger.

A. 103

B. 132

C. 174

D. 240

A

132

74
Q

An open vessel contains 1.0 lbm of water at 120°F and standard atmospheric pressure. Which one of
the following will be caused by the addition of 540 Btu to the water?

A. The water temperature will increase to approximately 212°F; and less than 50 percent of the water
will vaporize.

B. The water temperature will increase to approximately 212°F; and more than 50 percent of the
water will vaporize.

C. The water temperature will increase to significantly higher than 212°F; and less than 50 percent of
the water will vaporize.

D. The water temperature will increase to significantly higher than 212°F; and more than 50 percent
of the water will vaporize.

A

The water temperature will increase to approximately 212°F; and less than 50 percent of the water
will vaporize.

75
Q

Dry saturated steam at 1,000 psia enters an ideal high pressure (HP) turbine and exhausts at 100 psia.
The HP turbine exhaust then enters an ideal low pressure (LP) turbine and exhausts to a steam
condenser at 1.5 psia. Which one of the following will cause the HP and LP turbines to produce more
equal power? (Assume all pressures remain the same unless stated otherwise.)

A. Reheat the HP turbine exhaust.

B. Lower the steam condenser pressure.

C. Remove the moisture from the HP turbine exhaust.

D. Decrease the pressure of the dry saturated steam entering the HP turbine.

A

Remove the moisture from the HP turbine exhaust.

76
Q

A nuclear power plant experienced a reactor trip. One hour after the trip, core cooling is being
accomplished by relieving dry saturated steam from a steam generator (SG). Water level in the SG is
being maintained by an operating feedwater pump. Average fuel temperature is stable.
Given the following current conditions:
Core decay heat rate = 33 MW
SG pressure
= 1,000 psia
Feedwater temperature = 90°F
For the above conditions, approximately what feedwater flow rate is needed to maintain a constant
mass of water in the SG?

A. 100,000 lbm/hr

B. 125,000 lbm/hr

C. 170,000 lbm/hr

D. 215,000 lbm/hr

A

100,000 lbm/hr

77
Q

Subcooled water is flowing through a heat exchanger with the following parameters:
Inlet temperature = 75°F
Outlet temperature = 120°F
Mass flow rate
= 6.0 x 104 lbm/hr
What is the approximate heat transfer rate in the heat exchanger?

A. 1.1 x 106 Btu/hr

B. 2.1 x 106 Btu/hr

C. 2.7 x 106 Btu/hr

D. 3.3 x 106 Btu/hr

A

2.7 x 106 Btu/hr

78
Q

A main condenser is operating at 1.0 psia. If 20,000 ft3 of dry saturated steam is condensed to
saturated water in the condenser, what will be the approximate volume of the saturated water?

A. 1 ft3

B. 10 ft3

C. 100 ft3

D. 1,000 ft3

A

1 ft3

79
Q

An open vessel contains 2.0 lbm of water at 200°F and standard atmospheric pressure. Which one of
the following will be caused by the addition of 16.0 Btu to the water?

A. The water temperature will increase, and all of the water will boil off.

B. The water temperature will increase, and none of the water will boil off.

C. The water temperature will rise to 212°F, and some of the water will boil off.

D. The water temperature will rise to 216°F, and some of the water will boil off.

A

The water temperature will increase, and none of the water will boil off.

80
Q

Dry saturated steam at 900 psia enters an ideal high pressure (HP) turbine and exhausts at 240 psia.
How much heat, if any, must be added to the HP turbine exhaust to produce dry saturated steam at 240
psia?

A. 0 Btu/lbm

B. 11 Btu/lbm

C. 111 Btu/lbm

D. 155 Btu/lbm

A

111 Btu/lbm

81
Q

Dry saturated steam enters a turbine at 1000 psia with the turbine exhaust pressure at 2 psia. The
efficiency of the turbine is 85 percent. What is the approximate specific work output of the turbine?

A. 329 Btu/lbm

B. 355 Btu/lbm

C. 387 Btu/lbm

D. 455 Btu/lbm

A

329 Btu/lbm

82
Q

Saturated steam at 900 psia enters a high pressure (HP) turbine and exhausts at 200 psia. The HP
turbine exhaust passes through a 100 percent efficient moisture separator (with no heat gain or loss)
before it enters a low pressure (LP) turbine. What is the enthalpy of the 200 psia steam entering the
LP turbine?

A. 1,028 Btu/lbm

B. 1,076 Btu/lbm

C. 1,107 Btu/lbm

D. 1,199 Btu/lbm

A

1,199 Btu/lbm

83
Q

Three days ago, a nuclear power plant experienced a sustained loss of all AC electrical power.
Currently, there is turbulent boiling occurring throughout the entire spent fuel pool. Spent fuel
assembly temperatures are elevated but stable. Assume the spent fuel pool contains pure water in
thermal equilibrium, and boiling is the only means of heat removal from the spent fuel pool.
Given the following current conditions:
Total Spent fuel decay heat rate = 1.4 MW
Spent fuel building pressure
= 15.0 psia
What is the approximate rate of water loss occurring from the spent fuel pool?

A. 4,149 lbm/hr

B. 4,924 lbm/hr

C. 18,829 lbm/hr

D. 26,361 lbm/hr

A

4,924 lbm/hr

84
Q

A reactor is operating with the following reactor coolant system (RCS) parameters:
RCS pressure
= 2,235 psig
RCS hot leg temperature = 600F
RCS cold leg temperature = 580F
RCS mass flow rate = 1.0 x 108 lbm/hr
What is the approximate thermal power output of the reactor in megawatts (MW)?

A. 124 MW

B. 587 MW

C. 821 MW

D. 2,798 MW

A

821 MW

85
Q

Given the following initial conditions for a spent fuel pool:
Spent fuel decay heat rate
= 6.0 MW
Spent fuel pool water temperature = 90°F
Spent fuel pool water mass
= 2.5 x 106 lbm
Spent fuel pool water specific heat = 1.0 Btu/lbm-°F
If a complete loss of spent fuel pool cooling occurs, approximately how long will it take for spent fuel
pool water temperature to reach 212°F? (Assume the spent fuel pool remains in thermal equilibrium,
and there is no heat removal from the spent fuel pool.)

A. 6 hours

B. 15 hours

C. 26 hours

D. 51 hours

A

15 hours

86
Q

The pressure of a saturated steam-water mixture is 760 psia.
Which one of the following parameter values, when paired with the pressure of the mixture, provides
insufficient information to determine the specific volume of the mixture?

A. Quality is 84.6 percent.

B. Temperature is 512.4°F.

C. Enthalpy is 764.5 Btu/lbm.

D. Entropy is 0.88 Btu/lbm-R.

A

Temperature is 512.4°F.

87
Q

Three days ago, a nuclear power plant experienced a sustained loss of all AC electrical power, which
disabled the normal means of heat removal from the spent fuel pool. Currently, there is turbulent
boiling occurring throughout the spent fuel pool. A fire truck is being used to supply pure makeup
water at 70°F to maintain the spent fuel pool water level.
For simplification of calculations, assume the following:
* The spent fuel pool contains pure water.
* All steam leaving the surface of the spent fuel pool is dry saturated steam at 15.0 psia.
Approximately how much heat is each pound-mass of makeup water removing from the spent fuel
pool?

A. 143 Btu

B. 970 Btu

C. 1,113 Btu

D. 1,151 Btu

A

1,113 Btu

88
Q

A nuclear power plant is operating at a steady-state power level, with the steam generators supplying
dry saturated steam to the main steam lines.
Given:
Total main steam flow rate
= 4 x 106 lbm/hr
Condensate temperature
= 95°F
Feedwater temperature
= 450°F
Main steam pressure
= 960 psia
Steam cycle thermal efficiency = 38 percent
What is the approximate rate of heat rejection in the main condenser?

A. 341 MW

B. 478 MW

C. 556 MW

D. 823 MW

A

556 MW

TEST (22 decks)

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