RQ-C-4922, E-1 Series & Background Flashcards
1
Q
During a LBLOCA, why are RCPs tripped?
A
- To protect pumps from damage due to loss of cooling due to the Phase B Containment Isolation signal.
2
Q
What is the purpose of checking for any SG pressure lowering or RCS pressure rising in E-1?
A
- To determine if a faulted SG is still blowing down. If it is, then loop back in the procedure.
3
Q
What is the purpose of tripping RCPs during a SBLOCA?
A
- Prevents an increased mass loss through the break location thus mitigating core uncovery
4
Q
When is PZR level not a valid indication of RCS inventory and why?
A
- When subcooling does not exist in the RCS
- Voids in the RCS can cause a rise in PZR level with no increase in inventory (i.e., mass).
5
Q
During a LBLOCA, one train of ECCS equipment is without power. After 50 minutes, would the only remaining RHR pump be used for RHR spray?
A
- Yes as long as one SI pump and one CCP are running with suction aligned to the sump
6
Q
Why are the CCW trains split during the transfer to cold leg recirculation?
A
- Prevent runout of the remaining CCW pump if one were to trip/rupture
7
Q
What panel indications would be indicative of sump blockage?
A
- Erratic or low motor amps, pump discharge pressure, or vibes
8
Q
During transfer of RHR and CTS to recirculation, how long should flow be interrupted
A
- <5 minutes
