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Module 3 - ECCS > E12 - RHR > Flashcards

E12 - RHR Flashcards

1
Q

What is the AUTO permissive for LPCI injection? (valve open permissive)

A

< 476 psig

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2
Q

what is the manual permissive for opening LPCI injection valve?

A

< 450 psig

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3
Q

What are the temperature limits for the suppression pool?

A

< 95 deg F without testing, >1%
<105 deg F if heat is being added to pool (RCIC) >1%
<110 deg F, < 1% Rx power

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4
Q

What 2 modes of RHR will AUTO initiate?

A

LPCI

CTMT spray

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5
Q

what order do the ECCS systems turn on?

A
  1. 5 sec, RHR C and LPCS

7. 5 seconds, RHR A/B

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6
Q

What is the CTMT spray logic for Div 1 and Div 2?

A

Must have LPCI signal for division first;
THEN,
Div 1 - (CTMT) A or C, AND, (DW) A or E
Div 2- (CTMT) B or D, AND, (DW) B or F

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7
Q

what is the max flow of a RHR pump?

A

7450 gpm @ 125 psid

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8
Q

what is the max flow for RHR jockey pump?

A

40 gpm @ 50 psig

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9
Q

What combination of signals will initiate LPCI for Div 1 and 2?

A

1 A and 1 E for Div 1
1 B and 1 F for Div 2
2 levels or 2 pressures will always do it
1 level and 1 pressure MAY do it under the right logic.

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10
Q

What are the ECCS Acceptance criterias?

A

CLOTH

  1. Core remains amenable to cooling
  2. Long term cooling
  3. Oxidation of cladding not to exceed 17% total cladding thickness
  4. Temp of fuel cladding not to exceed 2200 deg F
  5. Hydrogen generated from chemical reaction of the cladding with water or steam shall not exceed 1%.
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11
Q

what is the normal position of the F024 A/B and F021 (return to Supp Pool)

A

Normally closed and receives a closed signal on a LPCI signal

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12
Q

explain the 2 valve logic diagrams (since i can’t draw on this app)

A

F004 looks at the F006.
F006 looks at the F004 and F024.
F024 looks at the F004

F027 looks at the F028 and F042

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13
Q

What additional purpose does the RHR C Jockey pump have?

A

Reference leg fill for Div 2 suppression pool level

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14
Q

What happens to min/flow when starting up Shutdown Cooling?

A

Has 8 second time delay to prevent putting RX water in the suppression pool

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15
Q

What does RHR A/B Jockey pump do?

A

Feedwater leakage control system

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16
Q

How are valves aligned in Standby?

A

Aligned for auto initiation of LPCI or CTMT spray

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17
Q

What are the setpoints to initiate LPCI?

A
  • 150.3” Rx Water level

1. 39 DW Pressure

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18
Q

What divisions does each RHR pump come from?

A

Div 1 - RHR A, LPCS

Div 2 - RHR B/C

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19
Q

What pressure must RX be at to inject RHR in LPCI mode?

A

476 psig

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20
Q

Where does water come from for CTMT Flooding?

A

SSW B downstream of RHR HX

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21
Q

Where does CTMT Flood discharge to?

A

LPCI line

22
Q

How much water can CTMT Flood provide?

A

Above top of active fuel

Floods RX, DW, and CTMT

23
Q

How is a Full Flow Test performed?

A

From Suppression pool, through HX, and back to suppression pool

24
Q

what is the primary suction source of RHR A,B,C?

What are the other two places A and B can get a suction?

A

suppression Pool

Recirc Line B and Spent fuel pool

25
Q

What are the time interlocks with the F048 (HX Bypass Valve) with LPCI and CTMT spray?

A

LPCI - after initiation, it is interlocked OPEN for 3.41 minutes to ensure MAX FLOW to RX

CTMT Spray - if CTMT spray is initiated within the 3.41 minutes of a LPCI, it will cycle for the duration of the timer. After the timer, valve will close and remain closed to provide MAX COOLING.

26
Q

How many pumps are required to maintain RX level after a LOCA?

A

3 to restore, 1 to maintain

27
Q

what rate does the min/flow line restrict flow to?

A

1,000 gpm

28
Q

Why is there a time delay on min/flow valve opening and how long is the delay?

A

prevent pumping RX water into suppression pool when starting shutdown cooling, 8 seconds.

29
Q

What pressure should RX be at for shutdown cooling?

A

< 135 psig

30
Q

where can shutdown cooling mode be discharged to?

A

Feedwater line
LPCI line
Upper CTMT pool

31
Q

What level must the Suppression pool be at to run RHR pumps?

A

> 18’ 4 1/2” in modes 1,2,3

INOP if < 14’6” because of NPSH

32
Q

What’s the normal position for the F027?

A

OPEN

33
Q

What must be closed to open F027 from the P601 panel?

A

F042 AND F028 must be closed

34
Q

What takes precedence between LPCI and CTMT spray?

A

CTMT Spray

35
Q

What are the power supplies to the Jockey pumps and MOVs?

A

Div 1 - 15B31 (JP), 15B11 (MOVs)

Div 2 - 16B31(JP), 16B11 (MOVs)

36
Q

What valve lineup should be done to put Shutdown Cooling in service?

A

F004 (Supp Pool Suction) and F024 (Return to Suppression Pool) Must be closed prior to opening F006 (Common Suction)

37
Q

What will manual pushbutton bypass on CTMT spray?

A

It will bypass the timer and level, but not drywell pressure

38
Q

When will the Heat Exchanger bypass valve F048 go closed during CTMT Spray?

A

If the HX inlet 47B and outlet 3B are Full open

39
Q

What will Manual initiation bypass of CTMT spray?

A

LOCA and CTMT pressure, and 10.85 minute timer

BUT,

NOT Drywell Pressure

40
Q

If a LPCI initiation occurs while in Fuel Pool Cooling Assist, what actions must be taken?

A

Turn the pump off and then Realign

41
Q

What are the modes of RHR?

A
  1. LPCI
  2. CTMT Spray
  3. CTMT Flooding
  4. Shutdown Cooling
  5. Suppression Pool Cooling
  6. Fuel Pool Cooling Assist
  7. Emergency Makeup to the upper CTMT pool
42
Q

What setpoints start CTMT spray A?

A

Div 1 LPCS/RHR A LPCI Initiation, AND
10.85 minute time delay, AND
High CTMT pressure 7.84 Psig, AND
High drywell pressure 1.39 psig

43
Q

When does E12-F064 A/B/C (min flow valves) open and close?

A

Automatically cycles on pump discharge flow low, <1154 gpm, 8 second time delay, with PUMP RUNNING.

44
Q

What is the flow path for the Full Flow Test?

A

Suppression Pool to Suppression Pool

with all flow through the HX (most resistance)

45
Q

What are the following E12 valves?

F028, F037, F042, F053, F024, F004

A 
F028 - CTMT spray
F037 - Upper pool
F042 - LPCI line
F053 - Feedwater line
F024 - Return to suppression pool
F004 - Suction from suppression pool
46
Q

What valve in this system is throttable?

A

F053 - Feedwater line

47
Q

Where does SDC suck from?

A

Recirc B

48
Q

What valves are associated with SDC

A

F006, F008, F009

49
Q

What are the RHR pump trips?

A

LSS
MPD
No suction path

Low suppression pool level will NOT trip pump

50
Q

What initiates CTMT spray B?

A 
Div 2 RHR B/C LPCI initiation, AND
10.85 minute timer, AND 
High CTMT pressure 7.84 psig, AND
DW pressure 1.39 psig, AND
2.5 second time delay (this TD is only for ctmt spray B)
51
Q

Will the HX bypass valve (F048) auto close after 3.41 minutes of a LPCI signal?

A

No, but it can manually be closed after the 3.41 minutes

Module 3 - ECCS (6 decks)

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