Loss of Cooling Water Flashcards
How is loss of cooling water restored when the problem exists due to electrical faults?
If no cooling water pumps are running AND electrical power must be restored to start a cooling water pump, then:
Place both pumps in PTL
AND
Perform degraded electrical AOP
What are the required actions for a sustained loss of power to PW or TC?
A plant trip is required for this situation.
What are the limitations on RCP seal operation without NC?
If NC is lost to an RCP that has Seal Inj, then cooling water must be restore within 10 minutes.
If NC is lost to a RCP without Seal Inj, then cooling water must be restored within 3 minutes.
Otherwise the Rx must be tripped and the RCPs secured. Then isolate controlled bleedoff.
State the required TCAs associated with a loss of NC to RCPs.
From the time of the loss of NC, power must be reduced or cooling water isolated and the RCP shutdown within 30 minutes. This is to protect the motor and bearings from a loss of cooling to the lubricating oil, or motor assy bearing seizure may occur.
State the TCA associated with a loss of NC to priority loads, the loads affected and the consequences of not meeting the TCA.
From the time of the loss of NC due to a LOOP or unaffecting leak in the NC(isolated from the priority loads), EW must be cross connected to supply NC priority loads within 10 minutes. Those loads are the Normal chiller, RCS sample coolers, RCP loads and CEDM normal ACUs. If not done seal damage and thrust bearing damage damage including possible seizure.
Why is seal bleedoff isolated after the RCPs are tripped?
Prevents damaging the seals from hi temperature bleedoff flow.
Diagnose an NC leak inside containment and describe the required actions.
Close NC containment isolation valves(order matters!!! Supply, return, return).
Trip the Rx.
Stop all RCPs
Isolate bleedoff
GO TO SPTAs.
Determine if EW - NC is an appropriate strategy for a NC leak outside of containment.
If the leak is within the boundaries of NC-99, the normal chillers and the inside containment checkvalve then cross connecting will not be possible.
Describe the impact of EW - NC lineup has on TS operability of safety systems
EW - NC will render that train of EW inoperable(3.7.7) as well as that train of EC (3.7.10). IF EW is used to supply the SFP heat exchangers, then EW is OOS until a flow balance is performed.
How is EW flow to the RCPs increased following EW - NC cross connecting?
No more than 1 chiller outlet valve is open. Stop only one of the previously running chillers.
Unlock and throttle the SDC HX outlet valve until RCP low NC flow alarms clear OR EW system flow lowers to 8500gpm.
What will isolate NC flow to containment if EW - NC is aligned?
Train A: SIAS or EW A low surge tank level
Train B: Manual valves so only a CSAS(isolates NC isolation valves)
