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1. Where is fluid taken from to fill the refueling pool when refueling the core?
Answer: RWST
2. How is reactor coolant system pressure controlled when the Pressurizer is water solid?
Answer: RHR System interfaces with the CVCS System for chemistry control and pressure control when water solid. Also, RHR suction reliefs may be used to satisfy LTOPS requirements.
3. What is the relationship between decay heat and the function of the RHR System?
Answer: Decay heat is a portion of the heat energy that the RHR System is designed to remove. Unlike structural components, decay heat continues to be generated long after other components have been cooled.
1. Controls RCS cooldown rate
F. RHR Heat Exchanger Outlet Flow Control Valve
2. RCS pressure must be less than 360 psig to open
A. RCS Hot Leg to RHR Pump Suction Valve
3. Discharge to PRT
L. RHR Pump Suction Relief Valve
4. Low Head Injection
D. RHR Pump
5. Normally locked
I. RHR Pump Discharge to RWST
6. Low pressure letdown
J. RHR Pump Discharge to CVCS
7. 600 psig setpoint
M. RHR Pump Discharge Relief Valve
8. Encapsulated in concentric guard pipe
B. Containment Recirculation Sump to RHR Pump
9. Potential for pressure locking
H. RHR Pump Discharge to RCS Hot Legs
10. Closes at 1650 gpm
K. RHR Pump Minimum Flow Valve
11. Provides cooling to RHR pump
E. RHR Heat Exchanger
12. Normal source to RHR pumps
C. RWST Suction Valves to the RHR Pumps
13. Normally open for ECCS injection
G. RHR Pump Discharge to RCS Cold Legs
3. What four conditions must be established to open BB PV-8702A and EJ HV-8701A, the RCS Hot Leg 1 to RHR Pump A Suction Valves?
Answer: EJHV8811A, BNHV8812A, and EJHV8804A all closed and RCS pressure must be less than 360 psig.
1. What is the setpoint of the RHR pump discharge high-pressure alarm?
Answer: > 580 psig
2. What is the setpoint of the Containment recirculation sump high-level alarm?
Answer: 2002' 3"
3. What is the setpoint of the RHR pump cold leg injection low flow alarm?
Answer: < 1700 gpm
What is the limiting RCS temperature and pressure for placing the RHR system into normal service?
Answer: < 350� F, < 360 psig
(T/F) The swap-over from ECCS injection to ECCS recirculation occurs automatically when RWST level decreases to 36%.
Answer: True
What is meant by the term "Mid-Loop Operation?"
Answer: Operation with Hot Legs drained to approximately 2014' 6" level; however, mid-loop condition exists whenever RCS water level is below the top of the flow area of the hot legs at the junction with the Reactor Vessel.
List the means of measuring hot leg level during half-loop operations.
Answer: Tygon tube or BB LI-53A/BB LI-54A.