Main turbine and reheaters

Question 1

HP turbine spins at ______ RPM, double axial flow, _____ stages in each direction. First stage is ____ blading and remaining stages _____.

Answer 1

1800 RPM
8 stages U1, 7 stages U2
Impulse; reaction

Question 2

Fourth stage extraction steam and drains are used _______ and _____.

Answer 2

in #_7A and B FW heaters.

as reheat steam in the first stage of the MSR.

Question 3

Sixth stage extraction steam and drains are routed to_____.

Answer 3

_6A and B FW heaters.

Question 4

Eighth stage extraction steam and drains are used in ____.

Answer 4

_5A and B FW heaters

Question 5

LP turbine spins at ______ rpm and the steam flowpath is ______ . How many stages and what type?

Answer 5

1800 rpm
Double axial flow ‑ steam enters in center and flows outward through 10 reaction stages.

Question 6

Intercept valves (closest to LP turbine) limits steam flow from MSR to LP turbine on a load rejection to prevent _______.
Reheat Stop valves provides added safety to prevent overspeed of turbine if turbine trips and ______.

Answer 6

Turbine overspeed.

intercept valves fail.

Question 7

Second stage extraction steam and drains from LP turbine are routed to _______.

Answer 7

FW heaters #_4A,B,C.

Question 8

Fourth stages LP turbines _______.

Answer 8

‑ FW heaters #_3A,B,C.

Question 9

Sixth stages LP turbines_____.

Answer 9

‑ FW heaters #_2A,B,C.

Question 10

Eighth and ninth stages LP turbines _________

Answer 10

‑ FW heaters #_1A,B,C

Question 11

Where do _PT-505 and 506 tap off?

Answer 11

Between 1st and 2nd stages

Question 12

Purpose of MSRs

Answer 12

Purpose – dry and superheat the HP turbine exhaust prior to use by the LP turbines in order to increase cycle efficiency and protect the low-pressure turbine blading from erosion.

Question 13

1st and 2nd stage reheat steam have startup drains. Drainage from these lines routed to condenser via crossover drains (_ES034A/B, _ES061A/B/C/D). What signals operate these valves?

Answer 13

Auto open on Turbine trip
Auto close at 27.3 psig crossover pressure

Question 14

Cold start in AUTO sequence:

Answer 14

Controller opens leakoff valves (_MS114’s)
Controller opens purge valves (_MS067’s) at 10% load.
Opens shutoff valves (_MS009’s) and closes leak off valves (_MS114’s) at 35% load.
Verifies shutoff valves (_MS009’s) open, then begins to increase inlet steam temp at 100F/HR by opening _MS147’s first, then _MS010’s.

Question 15

_____ is design limit for turbine materials analysis.

Answer 15

550F

Question 16

Reheat temperature ramps shall be limited to less than______

Answer 16

100F/hr

Question 17

LP Turbine Inlet Steam Temperature shall not exceed_____differential between turbines

Answer 17

50F

Question 18

Total loss of power to MSR controller will cause a loss of control system for AUTO and MANUAL control and the _________ will close.

Answer 18

MSR RTC valves will close

Question 19

High temp steam light will be lit when ____ and automatic action is _____.

Answer 19

Lit if LP inlet steam temp. > 550°F.
Reheat steam control valves (_MS010’s, _MS147’s) ramp back to lower LP inlet temp.

Question 20

Low load operate light maintains _____F when load is _____ for 5 minutes.

Answer 20

<425F
<10%

Question 21

Loss of a tube bundle requires it’s counterpart from _____ to be removed from service.

Answer 21

the other MSR

Question 22

Normally _____ pairs of thermocouples used for RTC with ____ as a backup.
Will shift _____ if backup lost.

Answer 22

A and C
B
manual

Question 23

Failure of any TC lights the ______.

Answer 23

TC fail light.

Question 24

MS010/147 Won’t open unless _______.

Answer 24

MS009 shutoff valves are open

Question 25

MS147A-D and _MS010A-D and some miscellaneous drain valves__________.

Answer 25

fail open on loss of IA

Question 26

Proper temperature control of MSR is required to prevent: (3 items)

Answer 26

Thermally induced damage
Excessive vibration
Excessive differential expansion

Question 27

What is the difference between hot reheat header A and B supplies?

Answer 27

Hot reheat header A supplies the steam to drive the turbine driven main feed pumps.

Question 28

Normally, the MSR drains go to _____, 1st stage reheater drains go to _____ and 2nd stage reheater drains go to_______.

Answer 28

HDT
1st stage=5a/b heaters
2nd stage=7a/b heaters