ENS 57194
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ENS Event | |
|---|---|
05:59 Jun 27, 2024 | |
| Title | Shutdown Required by Technical Specifications |
| Event Description | The following information was provided by the licensee via email:
At 0159 EDT on 6-27-24, DC Cook Unit 2 commenced a controlled shutdown to address identified leakage through 2-QRV-251, CVCS [chemical and volume control system] charging pumps discharge flow control valve, valve packing. The leakage started at 2303 EDT on 6-26-24 and was determined to be greater than the 10 gallons per minute limit per technical specification 3.4.13 allowable leakage. The leakage was determined to not be repairable at power. Per 10CFR 50.72(b)(2) this is a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> non-emergency report for Technical Specification required shutdown." The NRC Resident Inspector was notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: A normal shutdown is expected to be completed by 0900 EDT. There are no radiological releases. Unit 1 was not affected. There is no estimate for the time of the repairs. |
| Where | |
|---|---|
Cook  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.48 h-0.0617 days <br />-0.00881 weeks <br />-0.00203 months <br />) | |
| Opened: | Ted Dey 04:30 Jun 27, 2024 |
| NRC Officer: | Natalie Starfish |
| Last Updated: | Jun 28, 2024 |
| 57194 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (99 %) |
| After | Power Operation (71 %) |
WEEKMONTHYEARENS 571942024-06-27T05:59:00027 June 2024 05:59:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Shutdown Required by Technical Specifications ENS 546872020-05-01T07:54:0001 May 2020 07:54:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Reactor Coolant System Pressure Boundary Leakage ENS 511062015-05-31T20:00:00031 May 2015 20:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Failure of an Emergency Diesel Generator ENS 510042015-04-23T06:10:00023 April 2015 06:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Manual Reactor Trip Due to a Secondary Plant Transient ENS 481202012-07-19T19:30:00019 July 2012 19:30:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Inability to Restore Main Steam Isolation Automatic Actuation Logic and Actuation Relays within the Required Time ENS 427392006-07-30T11:30:00030 July 2006 11:30:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown for High Containment Air Temperature 2024-06-27T05:59:00 | |
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