ENS Event | |
|---|---|
20:13 Dec 23, 2022 | |
| Title | Technical Specification Required Shutdown |
| Event Description | The following information was provided by the licensee via email:
At 1513 EST on 12/23/22, a Technical Specification required shutdown was initiated at the Davis-Besse Nuclear Power Station Unit 1. Technical Specification [TS] Action Limiting Condition of Operation [LCO] 3.7.9 for Ultimate Heat Sink water level minimum requirements was not met and condition 'A' was entered on 12/23/22 at 1412 EST with a required action to `Be in Mode 3' with a completion time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and `Be Mode 5' with a completion time of 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. This event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(i). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. At 1640 on 12/23/22, the NRC granted enforcement discretion for the shutdown requirements of TS LCO 3.7.9 and the shutdown was terminated with the unit remaining in Mode 1. |
| Where | |
|---|---|
Davis Besse  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| LER: | 05000346/LER-2022-002 Strong Winds Result in Ultimate Heat Sink Low Water Level |
| Time - Person (Reporting Time:+-3.18 h-0.133 days <br />-0.0189 weeks <br />-0.00436 months <br />) | |
| Opened: | Matthew Allan 17:02 Dec 23, 2022 |
| NRC Officer: | Mike Stafford |
| Last Updated: | Dec 23, 2022 |
| 56284 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (86 %) |
WEEKMONTHYEARENS 578652025-08-12T20:21:00012 August 2025 20:21:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 562842022-12-23T20:13:00023 December 2022 20:13:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 557342022-02-05T20:14:0005 February 2022 20:14:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 520792016-07-01T09:42:0001 July 2016 09:42:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Failure to Perform Technical Specification Required Shutdown ENS 413302005-01-13T14:49:00013 January 2005 14:49:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Entry Into Technical Specification Required Shut Down Due to Loss of Essential Bus 2025-08-12T20:21:00 | |