Which of the following describes the normal lineup of the charging and letdown portions of the CVCS system?
L/D: RCS loop 3 Tc, LCV549 and 460, L/D orifice, demin, VCT
Charging: VCT, charging pump, RCS loop 1 or 4 Tc
Which of the following are purposes of the charging and letdown system?
provide seal injection flow to RCPs
control RCS coolant inventory
control RCS chemistry
What is the function of the charging pump safety grade minimum flow recirculation line isolation valves?
protect charging pumps during SBLOCA by ensuring a minimum flow path to the RWST
All the following are purposes of the CVCS except:
low head safety injection
Which of the following describes the function of the RHR system letdown control valve?
provides letdown flow when RHR system is in the S/D cooling mode
When performing a chemical addition to the RCS, why does the procedure caution to monitor for possible reactivity changes?
PGS used to flush chemicals from the chemical add tank could cause reactivity changes
During normal operations, the charging pumps are protected from low flow conditions via mini-flow recirculating line isolation valves, 3CHS*MV8111A/B/C and *MV8110.
What provisions are made to protect the charging pumps against low flow conditions in an emergency situation?
mini-flow recirc lines isols. *MV8111A/B/C and *MV8110 close and the safety grade mini-flow recirc lines *MV8511A/B open
What is the purpose of the interlock which prevents opening or closing letdown isolation valves, prior to letdown orifice isolation valves being closed?
to protect the regen HX from damage due to high temp/low pressure L/D flow from flashing to steam
What emergency signal automatically positions RCP seal return isolations, and letdown line containment isolation valves?
CIA signal
Which of the following statements describes the relationship between the charging and letdown flow passing through the regen HX during steady state operation?
letdown flow higher than charging flow
Plant at 100%
SBLOCA occurs
Crew starts second charging pump
Crew actuates SI
RCS pressure decreases/stabilizes
What is the expected position of the VCT outlet valves (CHSLCV112B/C) and the charging cold leg injection valves (SIHMV8801A/B)?
CHSLCV112B/C: closed
SIHMV8801A/B: closed
Where in the AB is 3CHS*V14 the bypass valve for letdown pressure control valve located?
AB 4’ general area
What is the purpose of placing *DEMN2 in service in the RCS letdown line when it is full of anion resin?
be an alternate method for deborating the RCS at end of core life
What is the purpose of placing *DEMN2 in service in the RCS letdown line when it is full of cation resin?
remove lithium from RCS
SI was manually actuated and all ECCS equipment operated.
What describes the response of the following CVCS components:
RCP seal return isolation valves
charging flow control isolation valves
RCP seal return isolation valves *MV8100 and 8112 CLOSED on CIA
Charging flow control isolation valves *MV8105 and 8106 CLOSED on SI
