RCPs Flashcards
What are the RCP trips?
- Phase Differential
- Overcurrent
- Overload
- Manual trip when #1 seal outlet temp > 185°F
What are the RCP interlocks?
- Bearing Lift Pump Motor Starter Closed
- Bearing Lift Oil # @ 510#
- # 1 Seal ΔP @ 215
What are the RCP power sources?
- B #1 RCP
- C #2 RCP
- D #3 RCP
- A #4 RCP
How much heat is added to the RCS by the RCPs?
- 14 MW of heat added to RCS
What does the Flywheel do on the RCP?
- helps remove decay heat immediately after trip ***
- increases 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 are the purpose of the labyrinth seals?
- Minimize thermal barrier heat exchanger bypass flow
- Minimizes RCS leakage to the seal package on a failure of the seals
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 AC EZC panels
What are the types of seals the RCP has?
- # 1 Seal - Film Riding
- # 2 Seal - Face Rubbing
- # 3 Seal - Face Rubbing
- Both 1 & 2 seals can handle RCS #
What supplies cooling to the Motor Air coolers?
- NESW
What supplies cooling to the Upper and Lower bearing oil coolers?
- CCW
What supplies cooling to the thermal barrier heat exchangers?
- 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 2 min to prevent damaging bearings
Which ONE of the following completes the following statements?
The RCP Bearing Lift Pump WHITE light will illuminate (1) after sufficient oil pressure is developed. The RCP Bearing Lift pump (2) required to be started on a RCP Shutdown.
(1) (2) A. immediately is B. immediately is NOT C. 2 minutes is D. 2 minutes is NOT
- B. (1) Immed (2) Is NOT
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
What cools the RCP if there is a failure of seal injection to the seals?
- RCS then cools the RCP by leaking past the labyrinth seal and past the thermal barrier
What does the shutdown seal do?
- Actuates when seal leakoff temp exceeds 250°F
- Rated for 24 hours
- Must actuate on stopped shaft
- Limits leakage to 1 gpm
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 directly, however, it does have a large impact on cntmt temp. A loss of the CHW cntmt header (removes cooling from CLVs and CUVs) requires a reactor trip and cooldown below 541°F to remove three RCPs
If QRV-150 is opened during normal operation (HOT), what is the risked associated with doing that?
- It increases the risk of thermal shocking the RCP shaft.
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 CCM-452 fails closed, what cooling do you lose?
- CCW to your RCP bearing oil coolers
