Q86 — CR Evacuation Seal Injection
003G2.4.34 (4.1)
Given:
• A Control Room Evacuation has been initiated on Unit 2 in accordance with S2.OP-AB.CR-0001, Control Room Evacuation.
In accordance with S2.OP-AB.CR-0001, which ONE of the following describes the procedural actions taken outside the control room to maintain seal injection flows to each Reactor Coolant Pump?
Note: 2CV71, Charging Header Pressure Control Valve
2CV73, Seal Injection Pressure Control Bypass Valve
2CV55, Charging Flow Control Valve
• A Control Room Evacuation has been initiated on Unit 2 in accordance with S2.OP-AB.CR-0001, Control Room Evacuation.
In accordance with S2.OP-AB.CR-0001, which ONE of the following describes the procedural actions taken outside the control room to maintain seal injection flows to each Reactor Coolant Pump?
Note: 2CV71, Charging Header Pressure Control Valve
2CV73, Seal Injection Pressure Control Bypass Valve
2CV55, Charging Flow Control Valve
A. Take local control of 2CV71 and 2CV55.
B. Take local control of 2CV71 and 23 Charging Pump speed controller.
C. Manually adjust 2CV73 and take local control of 23 Charging Pump speed controller.
D. Manually adjust 2CV73 and take local control of 2CV55.
▶ Show Answer & Explanation
✓ D. Correct. The procedural actions in S2.OP-AB.CR-0001(Q) direct local control of seal injection by isolating CV-71 (closing CV-70) and opening CV-73 (the CV-71 bypass) and manually adjusting the manual bypass valve. Total charging flow is then controlled locally at the charging flow control valve local controller in panel 216 using a centrifugal charging pump.
✗ A. Incorrect. Plausible because certain fire protection response procedures direct controlling the CV-71 valve with a hand sender. Incorrect as AB.CR-0001 directs evacuation due to either a security event or control room atmosphere issues, not a fire. Also AB.CR-0001 directs local control of seal injection by isolating CV-71 (closing CV-70) and opening CV-73 (the CV-71 bypass) and manually adjusting the manual bypass valve. The second part is correct.
✗ B. Incorrect. Plausible because certain fire protection response procedures direct controlling the CV-71 valve with a hand sender. The second part is also plausible as the potential exists to locally control the scoop tube for 23 Charging Pump and attempt to control flow. Incorrect as seal injection is controlled by CV-73 and a centrifugal charging pump IAW the abnormal procedure. 23 Charging pump is actually tripped by the procedure, once a centrifugal pump has been verified to be running.
✗ C. Incorrect. The first part is correct. The second is plausible as the potential exists to locally control the scoop tube for 23 Charging Pump and attempt to control flow. Incorrect as seal injection is controlled by CV-73 and a centrifugal charging pump IAW the abnormal procedure. 23 Charging pump is actually tripped by the procedure, once a centrifugal pump has been verified to be running.
Ref: S2.OP-AB.CR-0001(Q), Control Room Evacuation and Bases | LO: N/A | Source: Bank – Salem Vision Database | Cognitive: Comprehension
Connections
- Related systems: RCPs, CVCS
- Related procedures: AB.CR-0001 — Control Room Evacuation
- Related exam: 2020 NRC Written Exam