CVCS Waste Flashcards
State the inputs, operating characteristics and features of the RDT.
Inputs –
- PZR safeties, SDC reliefs, RCP vapor seal leakoff, CNMT drains
0. 5 psig N2 blanket (O2);
auto isolates at 10 psig (closes 560 & 540) (outlet and vent)
52% quench volume (RMW)
20” rupture disc goes at 120 psid (stuck open PZR safety)
Vented to GR if < 10 psig or to PASS (923) if > 10 psig
RDPs stop on lo RDT level if aligned to pump the RDT
What is the purpose of CHA-560 and 561?
What is its power supply and fail state?
RDT outlet valves. Closes on CIAS and HI HI RDT pressure of 10#(560 only). Can’t override hi pressure closure.
Powered from PKA and PKB. Fails CLOSED.
What is the purpose of CHN-540?
Vent to GR; closes on Hi-Hi RDT pressure (10 psig) – can’t override
What is the purpose of CHA-580?
What is its fail state?
RDT fill; CIAS w/override; must manually align in Aux Bldg to fill RDT
Closed.
What is the operating characteristics, and features of the EDT?
When do the pumps used to lower level auto stop?
sized to hold 30 minutes of LD if problem with Gas Stripper
3 psig N2 blanket; Auto isolates at 7 psig (outlet, vent, and inlet); 35% is minimum quench volume
RDPs stop on lo EDT level if aligned to pump the EDT
What are the purposes of CHN-563, 562 and 564?
- 563 (NK-AOV) outlet isolation; closes on hi-hi EDT pressure (7 psig) can’t override
- 562 (NK-AOV) inlet isolation; closes on hi-hi EDT pressure (7 psig) can’t override
- 564 (NK-AOV) GA isolation; closes on hi-hi EDT pressure (7 psig) can’t override
What is the purpose of the RDT Pumps?
when is the gas stripper bypassed?
What are the auto features associated with the RDPs?
RDPs pump RDT or EDT to HUT thru filter, PHIX, and Gas Stripper (only path procedurally allowed)
Can bypass the gas stripper(normally) or PHIX if chemistry and activity supports
Auto Stops Lo RDT level with 560 and 561 open
Lo EDT level with 563 open
560 or 561 closed with 563 closed (no suction)
500 diverts to PHIX
Other RDP started
Loss of CP
Pump must be manually restarted once condition clears
What is the purpose of CHN-565?
what are its fail states and power supply?
565 (NK-AOV) PHIX temp bypass; fails to bypass; (IX-AUTO-BYPASS)
Bypasses on Hi PHIX inlet temp of 140F (135 reset)
Shifts to IX on VCT level of 60% if no hi inlet temp present – returns to bypass at 58%
What is the purpose CHN-566?
What is its power supply and fail state?
566 (NK-AOV) PHIX outlet; fails to bypass; (EDT/AUTO/GAS STRIPPER)
Shifts to EDT on Gas Stripper hi-hi level if in AUTO
What is the purpose of the PHIX?
How is the PHIX used at EOL?
PHIX purifies RDP discharge, LD, HUT
Used when flow is thru gas stripper to HUT
Bypassed if flow is to be returned to VCT
Can be used as a deborating IX at EOL
What is the purpose of CHN-567?
What is its power supply and fail state?
What could be a consequence of aligning the gas stripper to the VCT?
567 (NK-AOV) Fails to HUT (HUT/AUTO/VCT); auto shifts to HUT at 60% VCT level, returns at 58%
If aligned to the VCT, gas stripper operation can affect boron concentration
