E12 - RHR Flashcards
What is the AUTO permissive for LPCI injection? (valve open permissive)
< 476 psig
what is the manual permissive for opening LPCI injection valve?
< 450 psig
What are the temperature limits for the suppression pool?
< 95 deg F without testing, >1%
<105 deg F if heat is being added to pool (RCIC) >1%
<110 deg F, < 1% Rx power
What 2 modes of RHR will AUTO initiate?
LPCI
CTMT spray
what order do the ECCS systems turn on?
- 5 sec, RHR C and LPCS
7. 5 seconds, RHR A/B
What is the CTMT spray logic for Div 1 and Div 2?
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
what is the max flow of a RHR pump?
7450 gpm @ 125 psid
what is the max flow for RHR jockey pump?
40 gpm @ 50 psig
What combination of signals will initiate LPCI for Div 1 and 2?
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.
What are the ECCS Acceptance criterias?
CLOTH
- Core remains amenable to cooling
- Long term cooling
- Oxidation of cladding not to exceed 17% total cladding thickness
- Temp of fuel cladding not to exceed 2200 deg F
- Hydrogen generated from chemical reaction of the cladding with water or steam shall not exceed 1%.
what is the normal position of the F024 A/B and F021 (return to Supp Pool)
Normally closed and receives a closed signal on a LPCI signal
explain the 2 valve logic diagrams (since i can’t draw on this app)
F004 looks at the F006.
F006 looks at the F004 and F024.
F024 looks at the F004
F027 looks at the F028 and F042
What additional purpose does the RHR C Jockey pump have?
Reference leg fill for Div 2 suppression pool level
What happens to min/flow when starting up Shutdown Cooling?
Has 8 second time delay to prevent putting RX water in the suppression pool
What does RHR A/B Jockey pump do?
Feedwater leakage control system
How are valves aligned in Standby?
Aligned for auto initiation of LPCI or CTMT spray
What are the setpoints to initiate LPCI?
- 150.3” Rx Water level
1. 39 DW Pressure
What divisions does each RHR pump come from?
Div 1 - RHR A, LPCS
Div 2 - RHR B/C
What pressure must RX be at to inject RHR in LPCI mode?
476 psig
Where does water come from for CTMT Flooding?
SSW B downstream of RHR HX
Where does CTMT Flood discharge to?
LPCI line
How much water can CTMT Flood provide?
Above top of active fuel
Floods RX, DW, and CTMT
How is a Full Flow Test performed?
From Suppression pool, through HX, and back to suppression pool
what is the primary suction source of RHR A,B,C?
What are the other two places A and B can get a suction?
suppression Pool
Recirc Line B and Spent fuel pool
What are the time interlocks with the F048 (HX Bypass Valve) with LPCI and CTMT spray?
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.
How many pumps are required to maintain RX level after a LOCA?
3 to restore, 1 to maintain
what rate does the min/flow line restrict flow to?
1,000 gpm
Why is there a time delay on min/flow valve opening and how long is the delay?
prevent pumping RX water into suppression pool when starting shutdown cooling, 8 seconds.
What pressure should RX be at for shutdown cooling?
< 135 psig
where can shutdown cooling mode be discharged to?
Feedwater line
LPCI line
Upper CTMT pool
What level must the Suppression pool be at to run RHR pumps?
> 18’ 4 1/2” in modes 1,2,3
INOP if < 14’6” because of NPSH
What’s the normal position for the F027?
OPEN
What must be closed to open F027 from the P601 panel?
F042 AND F028 must be closed
What takes precedence between LPCI and CTMT spray?
CTMT Spray
What are the power supplies to the Jockey pumps and MOVs?
Div 1 - 15B31 (JP), 15B11 (MOVs)
Div 2 - 16B31(JP), 16B11 (MOVs)
What valve lineup should be done to put Shutdown Cooling in service?
F004 (Supp Pool Suction) and F024 (Return to Suppression Pool) Must be closed prior to opening F006 (Common Suction)
What will manual pushbutton bypass on CTMT spray?
It will bypass the timer and level, but not drywell pressure
When will the Heat Exchanger bypass valve F048 go closed during CTMT Spray?
If the HX inlet 47B and outlet 3B are Full open
What will Manual initiation bypass of CTMT spray?
LOCA and CTMT pressure, and 10.85 minute timer
BUT,
NOT Drywell Pressure
If a LPCI initiation occurs while in Fuel Pool Cooling Assist, what actions must be taken?
Turn the pump off and then Realign
What are the modes of RHR?
- LPCI
- CTMT Spray
- CTMT Flooding
- Shutdown Cooling
- Suppression Pool Cooling
- Fuel Pool Cooling Assist
- Emergency Makeup to the upper CTMT pool
What setpoints start CTMT spray 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
When does E12-F064 A/B/C (min flow valves) open and close?
Automatically cycles on pump discharge flow low, <1154 gpm, 8 second time delay, with PUMP RUNNING.
What is the flow path for the Full Flow Test?
Suppression Pool to Suppression Pool
with all flow through the HX (most resistance)
What are the following E12 valves?
F028, F037, F042, F053, F024, F004
F028 - CTMT spray F037 - Upper pool F042 - LPCI line F053 - Feedwater line F024 - Return to suppression pool F004 - Suction from suppression pool
What valve in this system is throttable?
F053 - Feedwater line
Where does SDC suck from?
Recirc B
What valves are associated with SDC
F006, F008, F009
What are the RHR pump trips?
LSS
MPD
No suction path
Low suppression pool level will NOT trip pump
What initiates CTMT spray B?
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)
Will the HX bypass valve (F048) auto close after 3.41 minutes of a LPCI signal?
No, but it can manually be closed after the 3.41 minutes
