Document Title: | PNO-III-20-001: Unplanned Shutdown Greater Than 72 Hours Due to Reactor Coolant System Leakage Exceeding Technical Specification Limits |
Document Type: | NRC Preliminary Notification of Event/Occurrence |
Document Date: | 05/04/2020 |
Power Reactor | Event Number: 54687 |
Facility: COOK Region: 3 State: MI Unit: [] [2] [] RX Type: [1] W-4-LP,[2] W-4-LP NRC Notified By: RODNEY PICKARD HQ OPS Officer: DONALD NORWOOD |
Notification Date: 05/01/2020 Notification Time: 11:53 [ET] Event Date: 05/01/2020 Event Time: 03:54 [EDT] Last Update Date: 05/01/2020 |
Emergency Class: Non Emergency 10 CFR Section: 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION |
Person (Organization): ANN MARIE STONE (R3DO) |
Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode | |||||||
2 | N | Y | 100 | Power Operation | 0 | Hot Standby |
TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO REACTOR COOLANT SYSTEM PRESSURE BOUNDARY LEAKAGE "At 1000 EDT on May 1 2020, Operations commenced a shutdown of DC Cook Unit 2 to comply with LCO 3.4.13, Condition B Reactor Coolant System (RCS) pressure boundary leakage. "At 0354 EDT on May 1, 2020, Operations detected an estimated 8 gpm Reactor Coolant System leak. The source of the leak could not be identified and Tech Spec 3.4.13, Condition A was entered for unidentified RCS leakage in excess of the 0.8 gpm limit. "At 0745 EDT on May 1, 2020, Unit 2 entered LCO 3.4.13, Condition B when the 4-hour limit to complete the required actions of Condition A could not be met. "At 0945 EDT on May 1, 2020, Unit 2 entered LCO 3.4.13, Condition B when the 4-hour limit to complete the required actions of Condition A could not be met. "At 0945 EDT on May 1, 2020, inspections inside containment identified the leak as pressure boundary leakage from a pressurizer spray line which also requires entry into LCO 3.4.13, Condition B. "At 1059 EDT on May 1, Unit 2 was tripped from 15 percent power. All systems functioned normally. "This event is reportable under 10 CFR 50.72(b)(2)(i), the initiation of any nuclear plant shutdown required by the plant's Technical Specifications as a 4-hour report and under 10 CFR 50.72 (b)(3)(ii)(A), degraded condition, as an 8-hour report. The NRC Resident Inspector has been notified." |