RCPs Flashcards
What are the RCP trips?
- Phase Differential
- Overcurrent / Overload
What are the RCP interlocks?
- Bearing Lift Pump Motor Starter Closed
- Bearing Lift Oil pressure at 510 psig
What are the RCP power sources?
- B #1 RCP
- C #2 RCP
- D #3 RCP
- A #4 RCP
Berrien Country District Attorney
How much heat is added to the RCS by the RCPs?
14 MW
What does the Flywheel do on the RCP?
- Helps remove decay heat immediately after trip
- Sustains RCS flow following loss of power by increasing pump inertia which causes a longer coast down time to help prevent DNB
What is the seal injection flowpath of the RCPs?
- Seal water enters below Radial Bearing and #1 Seal (Normally 8 gpm per RCP)
- 5 gpm flows down RCP shaft into the RCS
- 3 gpm flows up thru #1 seal
- 3 gph flow up thru #2 seal
- 100 cc/hr flows up thru #3 seal
What is the seal return flow path?
- # 1 Seal - Seal Water hx to CCP suction (or VCT)
- # 2 Seal - RCP Standpipe and to the RCDT
- # 3 Seal - Outlet of RCDT
What is the purpose of the Anti-Rotation device (Ratchet Plate)?
- Minimize reverse flow through an idle pump
- Lowers starting current when starting RCP with one RCPs already running
Where are the RCP bearing lift pumps powered from?
600v EZC panels
What supplies cooling to the RCP Motor Air coolers?
NESW
What supplies cooling to the Upper and Lower bearing oil coolers?
CCW
What has to be done if you lost CCW to the RCPs or if the plant has had a Phase B actuation?
Trip RCPs within 3 min and 14 secs to prevent damaging bearings
When will the RCP Bearing Lift Pump WHITE light illuminate?
immediately after sufficient oil pressure is developed.
510 psi
What happens if QCM-350 isolates with regard to seal return?
1 Seal return is isolated and SV-50 will open at 150# and relieves to PRT which keeps seal leakoff available
If there is a loss of CCW to the thermal barrier, does the RCP need to be tripped?
No, as long as there is still seal flow and all parameters stay within spec
If there is a loss of CHW to the RCP motor air coolers, does it affect the operation of the RCPs?
It does not affect RCP operation.
It has a large impact on containment temperature and pressure.
If you have a rupture of the thermal barrier, where will it most likely indicate first if its a small leak?
CCW Surge Tank Lvl
If rupture disc blows on PRT, what is your indication?
PORV outlet temp decreases
The purpose of QRV-150, RCP #1 Seal Bypass Valve, is to provide:
adequate lower radial bearing cooling flow at low RCS pressures.
How much is the seal leak off for the # 1 Seal?
3 gpm
How much is the seal leak off for the # 2 Seal?
3 gph to standpipe to RCDT
How much is the seal leak off for the # 3 Seal?
100 cc/hr
Is the RCP Bearing Lift pump required to be started on a RCP Shutdown?
NO
How many CCW lines into and out of containment for RCP Cooling? Why?
1 line in, 2 lines out
So a thermal barrier leak can be isolated.
What is the primary function of the RCPs?
Circulates reactor coolant thru the core and SGs. (Transfers heat generated in the core to the SGs).
What is different about TS 3.4.7 RCS Loops MODE 5, Loops Filled in comparison to if Loops were NOT filled?
Credit can be taken for Natural Circulation
What is the bases behind TS 3.5.5 (Seal Injection Flow)?
If the resistance is too small, ECCS injection flow may be less than required for core cooling during a small break LOCA.
What is needed to start a RCP?
- # 1 Seal ΔP > 215 psi
- Interlock met
- VCT > 15 psig
- Cooling aligned
