ECCS (RQ-C-4722)

Question 1

Given:

• U1 was at 100% power
• LBLOCA occurs
• Reactor trips and SI actuates
• RCS pressure is 0 psig

Which ONE of the following valve positions would indicate an ECCS misalignment during the Injection Phase

A) BIT Inlet (IMO-255/256) and Outlet (ICM-250/251) valves OPEN.
B) VCT Outlet (QMO-451/452) valves CLOSED.
C) Centrifugal Charging Pump ELO (QMO-225/226) valves OPEN.
D) Charging Header Isolation (QMO-200/201) valves CLOSED.

Answer 1

C) Centrifugal Charging Pump ELO (QMO-225/226) valves OPEN.

Question 2

The design capacity of the ECCS accumulators is such that:

A) One accumulator spills onto the containment floor, and the others will fill outside the core barrel below the nozzles, the bottom plenum, and completely cover the core.
B) One accumulator spills onto the containment floor, and the others will fill outside the core barrel below the nozzles, the bottom plenum, and cover a portion of the core.
C) All accumulators will fully discharge to the core and will fill outside the core barrel below the nozzles, the bottom plenum, and completely cover the core.
D) All accumulators will fully discharge to the core and will fill outside the core barrel below the nozzles, the bottom plenum, and cover a portion of the core.

Answer 2

B) One accumulator spills onto the containment floor, and the others will fill outside the core barrel below the nozzles, the bottom plenum, and cover a portion of the core.

Question 3

Which ONE of the following conditions will allow the opening of 1-IMO-310 (E RHR Pump Suction)

A) RCS pressure is less than or equal to 375 psig
IMO-330, RHR Spy to Upper Cntmt East is open
IMO-215, East CTS pump suction is closed

B) ICM-305, East RHR Recirc Sump to E RHR/CTS Pumps is open
IMO-262, SI Pumps Recirc to RWST is closed
IMO-340, Chg Pumps Suct from E RHR HX is closed

C) ICM-305, East RHR Recirc Sump to E RHR/CTS Pumps is closed
IMO-330, RHR Spy to Upper Cntmt East is closed
IMO-340, Chg Pumps Suct from E RHR HX is closed

D) RCS pressure is less than or equal to 425 psig
IMO-340, Chg Pumps Suct from E RHR HX is open
IMO-215, East CTS Pump Suction is open

Answer 3

C) ICM-305, East RHR Recirc Sump to E RHR/CTS Pumps is closed
IMO-330, RHR Spy to Upper Cntmt East is closed
IMO-340, Chg Pumps Suct from E RHR HX is closed