EW (Essential Cooling Water) Flashcards
Action statement for 3.7.7 (Condition A) states “with one EW train inoperable, restore the EW train to OPERABLE status within 72 hours.” 3.7.7 provides NO guidance for two inoperable EW trains. Given these conditions with the unit operating in Mode 1:
0800 4/15/04: EWA-P01 becomes INOPERABLE.
2000 4/17/04: EWB-P01 becomes INOPERABLE.
2030 4/17/04: EWB-P01 becomes OPERABLE.
Assuming extensions are applied if appropriate, which of the following identifies when EWA-P01 must be returned to service before further action is required?
A. 2030 on 4/18/04
B. 0800 on 4/18/04
C. 0800 on 4/19/04
D. 2030 on 4/19/04
Answer: B
The following plant conditions exist: Nuclear Cooling water has been lost due to a pipe rupture Train ‘B’ EW has been cross-connected to NC Which one of the following identifies a plant condition that will isolate essential cooling water to the RCPs?
A. Instrument air header pressure drops to 60 psig.
B. Pressurizer pressure drops to 1800 psia.
C. B’ EW Surge Tank level drops to LO LEVEL setpoint.
D. Containment pressure rises to 9.0 psig.
Answer: D
Nuclear cooling water has been lost due to a pipe rupture in the yard. Essential Cooling Water Train “A” has been cross-connected to supply priority loads. No other equipment is out of service or in an abnormal lineup. WHICH ONE of the following identifies the plant conditions that will isolate essential cooling water to the reactor coolant pumps?
A. High level in the “A” EW surge tank
B. RCS pressure of 1800 psia
C. High EW “A” pump discharge pressure
D. Containment pressure of 2.0 psig
Answer: B
Nuclear Cooling water has been lost due to a pipe rupture Train ‘A’ EW has been cross-connected to NC Which one of the following identifies a plant condition that will isolate Essential Cooling Water to the RCP’s?
A. Containment pressure rises to 4.0 psig.
B. Pressurizer pressure drops to 1900 psia.
C. Instrument Air header pressure drops to 60 psig.
D. Loss of power to the EW to NC cross connect valves.
Answer: A
Nuclear cooling water has been lost due to a pipe rupture in the yard. Essential Cooling Water Train “B” has been cross-connected to supply priority loads. No other equipment is out of service or in an abnormal lineup. WHICH ONE of the following identifies the plant conditions that will isolate essential cooling water to the reactor coolant pumps?
A. Containment pressure 9.0 psig.
B. Pressurizer pressure 1800 psia.
C. Instrument air header pressure 60 psig.
D. Low level in the B train essential cooling water tank.
Answer: A
100% power. Loss of Nuclear Cooling Water. EW train “A” cross-connected to Nuclear Cooling Water. Which one of the following describes how the Essential Cooling Water system would respond to a Safety Injection Actuation Signal under these conditions? EW train ‘B’ pump would start and the EW Train “A”…
A. to NC cross-connect valves would remain open and Train ‘A’ EW pump would stop due to load shedding and then restart according to the sequencer.
B. would stop due to load shedding then restart according to the sequencer.
C. to NC cross-connect valves would remain open and the Train ‘A’ EW pump would remain running.
D. to NC cross-connect valves would close and the Train ‘A’ EW pump would remain running.
Answer: D
Unit 1 is operating at rated power. EW Train A is in the process of being aligned to NC due to a problem with both NCW pumps. Each RCP has about 375 gpm of cooling water flow indicated on B04. An Operator is standing by in the Train A SDC Heat Exchanger room to throttle the EW outlet of the SDC Heat Exchanger using EWA-HCV-53. Based on the above conditions, you should direct the Operator to throttle EWA-HCV-53:
A. open to increase the EW pump’s flowrate.
B. closed to divert more flow to the NCW system.
C. closed to reduce the heat load on the EW Heat Exchangers.
D. open to overcome the increased head loss that the NCW places on the EW system.
Answer: B
Of the following list of signals, select the answer that includes the signals that provide an automatic start of the Essential Cooling Water System.
A. SIAS, RAS, MSIS, AFAS
B. LOP, SIAS, MSIS, AFAS
C. LOP, RAS, CREVIAS, CREFAS
D. LOP, CSAS, CREFAS, AFAS
Answer: D
