Q35 — CCW Surge Tank Level Low / AB.CC-0001 Actions
008 A2.02 (3.2)
Given:
• Unit 2 is at 100% Power.
• Console bezel alarm, SURGE TANK LEVEL HI-LO, is LIT.
• CCW Surge Tank Level Channels A and B are LOWERING rapidly.
• The crew is implementing S2.OP-AB.CC-0001, Component Cooling Abnormality.
In accordance with S2.OP-AB.CC-0001, which ONE of the following completes the statement assuming the surge tank levels continue to lower?
When Surge Tank levels lowers to less than _(1)_, the operator is required to trip the reactor and _(2)_.
• Unit 2 is at 100% Power.
• Console bezel alarm, SURGE TANK LEVEL HI-LO, is LIT.
• CCW Surge Tank Level Channels A and B are LOWERING rapidly.
• The crew is implementing S2.OP-AB.CC-0001, Component Cooling Abnormality.
In accordance with S2.OP-AB.CC-0001, which ONE of the following completes the statement assuming the surge tank levels continue to lower?
When Surge Tank levels lowers to less than _(1)_, the operator is required to trip the reactor and _(2)_.
A. _(1)_ 17%
_(2)_ stop all RCPs, isolate Letdown, and swap Charging pump suction to the RWST
_(2)_ stop all RCPs, isolate Letdown, and swap Charging pump suction to the RWST
B. _(1)_ 17%
_(2)_ stop all RCPs ONLY
_(2)_ stop all RCPs ONLY
C. _(1)_ 5%
_(2)_ stop all RCPs ONLY
_(2)_ stop all RCPs ONLY
D. _(1)_ 5%
_(2)_ stop all RCPs, isolate Letdown, and swap Charging pump suction to the RWST
_(2)_ stop all RCPs, isolate Letdown, and swap Charging pump suction to the RWST
▶ Show Answer & Explanation
✓ D. Correct. IAW S2.OP-AB.CC-0001 Attachment 1, if surge tank level can NOT be maintained greater than 5%, then stop RCPs IAW Attachment 2. Per Attachment 2, the Rx is tripped, all RCPs are stopped, letdown is isolated, charging pump suctions are swapped to the RWST and then go to EOP-TRIP-1.
✗ A. Incorrect. First part is incorrect. Surge tank level less than 5% requires stopping RCPs IAW Attachment 2. Second part is correct. Plausible since the 17% level is expected knowledge to the operators to take immediate actions associated with low VCT level.
✗ B. Incorrect. First part is incorrect. Surge tank level less than 5% requires stopping RCPs IAW Attachment 2. Second part is incorrect. Per Attachment 2, if loss of CCW was the cause of the event, then in addition to stopping RCPs, letdown needs to be isolated and the charging pumps suction swapped over to the RWST. Plausible since the 17% level is expected knowledge to the operators to take immediate actions associated with low VCT level.
✗ C. Incorrect. First part is correct. Second part is incorrect. Per Attachment 2, if loss of CCW was the cause of the event, then in addition to stopping RCPs, letdown needs to be isolated and the charging pumps suction swapped over to the RWST.
Ref: S2.OP-AB.CC-0001 (R19) | LO: NOS05ABCC01-10, Objective 5 — Given a set of initial plant conditions: Describe the final plant condition that is established by the abnormal procedure | Source: Bank — Wolf Creek 2017 NRC RO8 | Cognitive: Comprehension/Analysis
Connections
- Related systems: CCW, CVCS
- Related procedures: S2.OP-AB.CC-0001 — Component Cooling Abnormality
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection
- Related exam: 2022 NRC Written Exam