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What are the appropriate methods of raising cooldown rate using the RHR HX, when in Normal Shutdown Cooling?
- Throttle Closed the bypass (MO-2002)
- Throttle Open the HX inlet (RHR-4-1)
- Increase RHRSW flow (while maintaining HX D/P >20psid
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What is the Tech Spec status of RHR if the Torus inventory is 12,000 lbm? Why?
- INOP
- All 4 RHR pumps must be declared INOP if primary containment non-condensable inventory decreases to less than 14,225 lbm
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What is the Tech Spec status of RHR if 3 ECCS Room Sump Pumps are Inoperable? Why?
- Operable
- Only 1 of the 4 sump pumps are required for operability
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Which RHR pumps have ESW motor cooling?
RHR pumps 13 and 14
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How does a loss of MCC-133A affect operability of ECCS pumps? Why?
- It does NOT affect ECCS pump Operability.
- ECCS sump pumps in A RHR are powered from MCC-133A.
- However, only 1 of the 4 total pumps (2 in A and 2 in B) are required for operability.
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What, if anything, happens with the RHR HX bypass valve on a LPCI initiation?
The selected RHR HX bypass valve will get a 60 second seal-in OPEN signal to allow full bypass flow around the HX.
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What RHR valves receive a CLOSE signal if RHR is in S/D Cooling when a Group 2 isolation occurs?
- S/D Cooling suction valves, MO-2029 AND MO-2030
- LPCI Injection valve, MO-2013 OR MO-2014
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With Recirc Riser pressures equal, which loop will LPCI loop select logic select?
With both riser pressures equal, LPCI loop select will default to B RHR loop.
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With the mode switch in RUN, and station power supplied from 2R, what is the timing sequence of the ECCS pumps if drywell press >1.84#?
- 5 sec: 11 and 12 RHR pumps
- 10 sec: 13 and 14 RHR pumps
- 15 sec: 11 and 12 Core Spray pumps
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On an ECCS initiation, with a 2R to 1R transfer, what is the timing sequence of the ECCS pumps?
- 5 sec: 2R to 1R
- +5 sec: 11 and 12 RHR pumps
- +10 sec: 13 and 14 RHR pumps
- +15 sec: 11 and 12 Core Spray pumps
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Following a Group 2 isolation, how are MO-2029, MO-2030, or the LPCI inboard injection valves opened?
The Group 2 isolation is seal-in and the Group 2 isolation must be reset for the valves to be re-opened.
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How is RHR operability affected when venting RHR?
Venting only INOPs the LPCI mode of RHR.
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What is the system response if both "B" RHR pumps trip while lined up for Torus Spray?
MO-2007 will immediately close if the "B" RHR pumps trip while lined up for Torus Spray or Torus Cooling. MO-2008 will close if "A" RHR pumps trip.
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Which is maintained at a higher pressure:
RHR or RHRSW?
RHRSW is maintained at a higher pressure than RHR. The D/P can be read locally and at C-03.
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What RHR valve(s) get a 5 minute seal-in OPEN signal on a LPCI initiation?
MO-2012 and MO-2013 will get a 5 minute seal-in OPEN signal on a LPCI initiation.
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What are the RHR pump power supplies?
- #11 and #13 RHR pumps from 15 Bus
- #12 and #14 RHR pumps from 16 Bus
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What is the normal capacity of each RHR pump?
4000 gpm each
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What RHR components can be operated from ASDS?
- #12 RHR pump
- V-AC-4
- MO-1987: Torus suction
- MO-2003: HX Bypass
- MO-2007: Torus spray/cooling
- MO-2009: Torus cooling
- MO-2033: RHR cross-tie
- CV-1995: Min flow line
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What RHR valves are powered from the swing bus?
- MO-2013 and MO-2015: LPCI injection
- MO-4085B: RHR inter-tie
- MO-2-3-53B and MO-2-3-43B: Recirc "B" Suction/Discharge
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