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NLO Systems NLIT exam 2 > RC- Reactor Coolant System > Flashcards

RC- Reactor Coolant System Flashcards

1
Q

What components make up the RCP shaft seal assembly?

A

casing, three tandem mechanical pressure reduction seals, auxiliary impeller

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2
Q

Name the start permissives of the RCPs.

A

no motor fauls

oil lift flow

NC water flow

RCP seal bleed off valve full open

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3
Q

What are CEA pellets made of?

A

Boron Carbide

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4
Q

Per tech spec, in mode 1 and 2, how many RCS loops have to be OPERABLE and in operation?

A

two

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5
Q

What is the tech spec limit for RCS pressure?

A

2750 psia

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6
Q

What is the heat sink to the RCS under normal operations?

A

Main steam and main feedwater systems

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7
Q

What components make up the upper guide structure assembly?

A

CEA shroud assembly

upper guide structure support barrel

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8
Q

In the reactor vessel, what allows for radial and axial expansion of the core?

A

the core support barrel assembly

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9
Q

What are the RCP trips?

A

under-voltage

over-current

coast-down

less than 600 for a few seconds during start up

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10
Q

Where is the primary chamber located in the steam generator and what is its purpose?

A

its in the bottom of the steam generator

part of the RCS boundary and directs flow through the steam generator

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11
Q

How many Fuel assemblies do the 12 finger CEAs interact with?

A

5

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12
Q

What components make up the core support barrel assembly?

A

Core support barrel

lower support structure and instrument nozzle assembly

core shroud assembly

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13
Q

How does the RCS interface with the reactor vessel level monitoring system (RVLMS)/QSPDS (SH)?

A

provides reliable (class) indication of the vessel level online and during accidents

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14
Q

What is the purpose of the anti-reverse rotation device?

A

stops a pump when it reaches zero speed so it can withstand reverse torques

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15
Q

What is the purpose of the pressurizer heaters?

A

to boil the water to increase the mass of steam in the vapor space

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16
Q

Where do the four safety valves discharge to?

A

under the water line in the RDT (reactor drain tank)

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17
Q

Per tech spec, How many pressurizer safety valves must be OPERABLE with lift settings between 2450-2549 psia

A

4

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18
Q

In the RCP shaft seal assembly, where does majority of the seal water flow get routed to?

A

through the auxiliary impeller to the journal bearing and lower journal bearing cavity

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19
Q

In the RCS, what does the RI system control?

A

nothing. it only collects data

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20
Q

What is the reactor vessel head seal drain valve? Where does it drain to?

A

When the inner reactor head o-ring starts leaking, causing an increase in pressure between the O-rings, this valve drains the coolant between the O-rings

RDT

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21
Q

What is the purpose of the steam generator tube sheet and U-tubes? How thick is the tube sheet?

A

separate primary from secondary sides of the steam generator

permit heat removal from the primary side without radioactive material transfer

23.5”

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22
Q

What is the purpose of the pressurizer spray system?

A

to reduce pressure by condensing steam in the vapor space of the pressurizer using subcooled water

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23
Q

What is the design pressure and temperature of the steam generator primary chamber?

A

650*F

2500 PSI

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24
Q

Which type of CEA do the shutdown banks A and B use?

A

12 finger only

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25
Q

How does the RCS interface with the SI system?

A

emergency core cooling and boron injection for reactor shutdown

long and short term cooling

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26
Q

Why is a steam generator tube rupture bad?

A

reactor coolant would be leaking into the main steam system allowing passage of radioactive material

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27
Q

What are the internals of the reactor vessel?

A

core support barrel assembly and the upper guide structure assembly

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28
Q

What acts as a surge volume to minimize pressure changes during load transients?

A

pressurizer

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29
Q

What system injects water at 6.6 gpm to the RCP shaft seal assembly?

A

charging

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30
Q

Are the reactor coolant pumps powered from class or non-class ?

A

non-class

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31
Q

What is the purpose of the RCP motor flywheel?

A

increases rotating inertia of the RCP which increases coast down time during LOP to pump motors

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32
Q

What is the tech spec range for pressurizer pressure?

A

2130-2295 psia

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33
Q

How many heaters are in the proportional pressurizer heater banks?

A

3 each

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34
Q

What maintains the RCS in a sub-cooled condition?

A

the pressurizer

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35
Q

What is the purpose of the reactor vessel?

A

contains the core and vessel internals

directs flow of coolant through the core

part of RCS pressure boundary to prevent fission product release

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36
Q

What happens if the RDT (reactor drain tank) is over pressurized by up to 10 psi? Over 10 psi?

A

tank reliefs to gaseous radwaste

tank relieves to containment through a rupture disk

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37
Q

What prevents the RCS from over pressurizing?

A

the pressurizer

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38
Q

What is the RCP oil lift pump auto feature?

A

prior to stopping RCP, oil lift pump handswitch must be put to auto–

RCP will stop, oil pump will turn on until operator secures handswitch

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39
Q

What two sections of the steam generator interfaces with the RCS?

A

primary chamber

tube sheet and U-tubes

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40
Q

Where does the pressurizer surge line connect the pressurizer to?

A

loop 1 hot leg

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41
Q

Why won’t the main spray flow function without the RCPs in service?

A

reactor vessel differential pressure isn’t sufficient to maintain spray flow without the RCPs

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42
Q

What is the total flow through the RCP shaft seal assembly?

A

22.6 gpm

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43
Q

describe the construction of a fuel rod

A

filled with uranium pellets with a compression spring and spacer disks at each end of a zirconium alloy tube seal welded with end caps and pressurized with helium

44
Q

What are the major components of the fuel assemblies?

A

fuel spacer grids

upper end fitting

hold down plate

lower end fitting

guide tubes

fuel rods

45
Q

How does the RCS interface with the SE (Ex-core neutron monitoring)system?

A

monitors neutron flux from detectors outside the vessel

46
Q

What is the RCS safety limit pressure?

A

2750

47
Q

what is the normal RCS pressure?

A

2250

48
Q

What minimizes leakage along the RCP shaft, also being an RCP boundary?

A

shaft seal assembly

49
Q

Describe the sealing mechanism between the reactor vessel and the closure head.

A

two silver plated inconel, self- energizing, metal O-rings sit in machined grooves on the closure head flange.

the outer o-ring is passive until the inner o-ring fails

50
Q

Why are the fuel pellets “dished” at the ends?

A

account for thermal expansion and fuel swelling

51
Q

What is the main flow path of the coolant within the reactor vessel?

A

through inlet nozzles, down between vessel wall and core barrel, through flow skirt section and into lower plenum, up through core to outlet region, through CEA shroud tubes and through outlet nozzles

52
Q

What do the four spring loaded safety valves on the pressurizer do?

A

prevent the RCS from reaching safety limit pressure

53
Q

How does the RCS interface with the NA system?

A

powers reactor coolant pumps

54
Q

In reference to the reactor vessel head, what is a self-energizing o-ring?

A

the O-rings are drilled around the inside allowing RCS pressure to pressurize the o-ring and form the seal

55
Q

How does the RCS interface with the SS (primary sampling) system?

A

samples PCS loop 1 hot leg, surge line, and pressurizer steam space

used for chemistry and boron control

56
Q

Per tech spec, in mode 3, how many RCS loops must be OPERABLE and in operation?

A

1

57
Q

How many fuel assemblies do the four finger CEAs interact with?

A

1

58
Q

What components make up the RCP oil lift system?

A

oil reservoir, filter, accumulator and oil lift pump

59
Q

How many of the pressurizer heater banks are back ups? How many proportional banks are there?

A

6

2

60
Q

What discharges from the RCS does the CH system collect?

A

drainage for maintenance

RCP seal bleed off

Primary safety valve discharge

identified leakage

61
Q

What pressures are associated with the main spray flow control valves?

A

start to open at 2275

full open at 2300

62
Q

How many spray heads are there for main spray and aux spray?

A

they share one spray head

63
Q

In the RCP shaft seal system, where is leakage past the vapor seal directed to?

A

Reactor Drain Tank

64
Q

How many heaters are in the back up pressurizer heater banks?

A

banks B1 and B2 each have 3

banks B3, 4, 5, and 6 all have 6 heaters each

65
Q

describe auxiliary spray in the pressurizer

A

water supplied from charging pumps

two solenoid valves to control flow

66
Q

What is the purpose of the pressurizer surge line?

A

flow path for coolant surging to or from pressurizer

transmits pressurizer pressure to entire RCS

67
Q

How does the RCS interface with the CEDMCS system?

A

CEDMCS controls the direction, rate, and duration of CEA’s

also controls the magnetic jack coils to CEDM’s

68
Q

Which type of CEA do the regulating groups use?

A

12 and 4 finger

69
Q

What are the primary functions of the reactor coolant pumps?

A

RCS boundary

provide flow in RCS

add heat to primary loop during plant heat ups

provide motive force for main spray valves

70
Q

Where are the pressurizer heaters powered from?

A

two back up banks are class powered from PGA/PGB

all other heaters are powered from NG

71
Q

How many CEA’s are in the core?

A

89 total

72
Q

In the reactor vessel, what purpose does the core bypass flow serve?

A

prevents stagnation of water in low flow areas

keeps primary coolant below saturation temp

removes gamma radiation heat from core support barrel

73
Q

When does shutdown cooling provide long term cooling?

A

after a LOCA

74
Q

If the pressurizer spray valve bypass valves are NOT isolation valves, what are they?

A

metering valves

75
Q

How many pressurizer heaters are there? How many banks are they divided into?

A

36

8

76
Q

How does the RCS interface with the RI (Fixed in-core instrumentation system, or FICS)?

A

measures neutron flux,

coolant temp. in 61 locations

monitors core characteristics to assure we do not exceed allowable limits

77
Q

What affect does the data collected from the surveillance capsule assemblies have on the plant?

A

Can have an effect on allowable heat up and cool down rates and the minimum temperature for reactor vessel pressurization

78
Q

Per tech specs, in mode 4, how many SDC loops must be OPERABLE? How many in operation?

A

2

1

79
Q

Describe Main spray in the pressurizer

A

subcooled water is supplied from the cold leg of the reactor

flow is controlled by diaphragm valves

80
Q

How does the RCS interface with the SG (main steam) and FW (feed water) systems?

A

remove heat from RCS

81
Q

Will the seal bleedoff isolation valves close while the RCP is running?

A

no

82
Q

why is maintaining constant main spray valve bypass flow important?

A

minimizes thermal shock on pipes, valves and spray nozzle

minimizes thermal stratification in piping

keeps chemistry uniform throughout RCS and pressurizer

83
Q

There are 48 of which CEAs?

A

12 finger full strength

84
Q

Can CEA motion be controlled automatically or manually?

A

both

85
Q

How is main spray bypass flowrate controlled?

A

manually adjusted to establish a temp differential of less than 70* between cold leg and spray nozzle piping

86
Q

What is the tech spec Tcold RCS loop temperature limit?

A

545*F

87
Q

What are the three main purposes of the RCS?

A

transfer thermal energy to the S/G

secondary barrier to the release of fission products

provide core cooling during all normal plant conditions

88
Q

In the RCP shaft seal system, what is the pressure drop across each of three seals?

A

42% of system pressure for first two seals, 16% across third seal

89
Q

Why are fuel rods pressurized with helium?

A

improve thermal conductivity of pellet to clad gap

prevent clad collapse

90
Q

When does SDC provide cooling for the reactor?

A

When the S/G’s are unavailable

91
Q

Why is Aux spray more effective than main spray?

A

charging water is 110* less than cold leg temp (555*).

92
Q

There are 28 of which CEA’s?

A

four finger full strength

93
Q

Where can I get samples of the RCS?

A

Loop 1 hot leg

Surge line

Pressurizer steam space

94
Q

How does the RCS interface with the NC system?

A

intermediate barrier between RCS and the PW system

provides cooling to the RCP motor air cooler, lube oil cooler, thrust bearing lube oil cooler, and seal coolers

95
Q

In the reactor vessel, what supports the upper ends of the fuel assemblies and protects the CEAs from coolant cross flow?

A

the upper guide structure assembly

96
Q

What are the three types of CEAs and how many are there of each?

A

5 regulating groups (1, 2, 3, 4, 5)

2 shut down groups (A and B)

2 part strength groups (P1 and P2)

97
Q

What is the difference between a steam generator tube rupture and a primary leakage?

A

S/G tube rupture is when the tube penetration is bad enough that the CVCS can’t maintain pressurizer level

primary leakage is when the CVCS can maintain pressurizer level

98
Q

What is the purpose of the RCP oil lift system?

A

provides forced lubrication to the thrust bearing

99
Q

How long before an RCP start is its respective oil lift pump started and why? how long after start up will the oil lift pump run?

A

7 minutes before so the oil can push the thrust bearing pads away from the thrust runner

2 after

100
Q

What do the surveillance capsule assemblies do?

A

monitor radiation induced changes in vessel materials

101
Q

There are 13 of which CEA’s?

A

four finger part strength

102
Q

How many kW are each of the pressurizer heaters rated at?

A

50

103
Q

How does the RCS interface with the CH system?

A

maintains pressurizer level,

chemistry control,

boron concentration

provides RCP seal injection

collects RCS discharges

supplies aux spray to pressurizer when normal spray path unavailable

purifies RCS

104
Q

How does the RCS interface with the IA system?

A

supplies control air to the pressurizer spray valves, controlled bleed-off containment isolation valves, and RDT bleed-off isolation valves

105
Q

How can the pressurizer heaters be controlled?

A

automatically by the pressurizer pressure control system

manually by operator

NLO Systems NLIT exam 2 (17 decks)

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