NRC Preliminary Notification of Occurrence (PNO) at Cook 2 in MI: Reactor Coolant System (RCS) pressure boundary from a pressurizer spray line

Cook nuclear power plant, Bridgman, MI, on Lake Michigan shore.[Cook Unit 2 in Bridgman, MI, on the Lake Michigan shore, went from 100% power level to 0% power level within just several hours, due to this occurrence/event.]

For Immediate Release - Posted to Public into ADAMS at 10:59 am 5/5/2020

D.C. Cook - Preliminary Notice of Occurrence (PNO) - 

The first issued by NRC Industry-wide for 2020

ML20125A383

https://adamswebsearch2.nrc.gov/webSearch2/main.jsp?AccessionNumber=ML20125A383 

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

Michael J. Keegan

Don't Waste Michigan

For Immediate Release Docketed 5/4/2020

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
5/1/2020 - 5/4/2020

54687

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

Event Text

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."

Forwarded by

Michael J. Keegan

Don't Waste Michigan