ENS 55451
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ENS Event | |
|---|---|
05:33 Sep 9, 2021 | |
| Title | High Pressure Core Spray Inoperable |
| Event Description | At 0033 CDT on September 9, 2021, Grand Gulf Nuclear Station (GGNS) was operating at 70 percent power when the High Pressure Core Spray (HPCS) was declared inoperable. The inoperability determination was made due to control room annunciations. In accordance with GGNS Technical Specification 3.5.1.B.1, the Reactor Core Isolation Cooling system was verified to be operable. Troubleshooting is in progress.
This event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as an event or condition which could have prevented the fulfillment of a safety function. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-1.23 h-0.0513 days <br />-0.00732 weeks <br />-0.00168 months <br />) | |
| Opened: | Gabe Hargrove 04:19 Sep 9, 2021 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Sep 9, 2021 |
| 55451 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (70 %) |
| After | Power Operation (80 %) |
Grand Gulf with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 554512021-09-09T05:33:0009 September 2021 05:33:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Inoperable ENS 543712019-11-06T00:11:0006 November 2019 00:11:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Two Diesel Generators Concurrently Inoperable ENS 542442019-08-28T18:16:00028 August 2019 18:16:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of High Presssure Core Spray ENS 533172018-04-05T16:17:0005 April 2018 16:17:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Hatch Left Open ENS 532272018-02-18T06:06:00018 February 2018 06:06:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Emergency Diesel Generators Inoperable ENS 531172017-12-12T19:30:00012 December 2017 19:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Declared Inoperable ENS 530382017-10-26T19:45:00026 October 2017 19:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Divisions of Drywell Vacuum Relief Declared Inoperable ENS 528432017-07-10T02:58:00010 July 2017 02:58:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Safety Function - Control Room Envelope Inoperable ENS 525162017-01-28T00:08:00028 January 2017 00:08:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Declared Inoperable ENS 507862015-02-04T15:34:0004 February 2015 15:34:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Ventilation Inoperable Due to Mispositioned Ventilation Inspection Port ENS 496472013-12-17T19:32:00017 December 2013 19:32:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Containment Isolation Capability Due to Surveillance Procedure Error ENS 466872011-03-20T03:36:00020 March 2011 03:36:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Valve Breaker Overcurrent Trip Setpoint Out of Tolerance ENS 463342010-10-14T09:22:00014 October 2010 09:22:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Trains of Control Room Air Conditioning Inoperable ENS 416502005-04-29T06:27:00029 April 2005 06:27:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Reactor Core Isolation Cooling Full Flow Test Line May Not Isolate ENS 416452005-04-27T23:07:00027 April 2005 23:07:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Main Steam Line Drain Containment Isolation Valves May Not Isolate ENS 409522004-08-14T15:25:00014 August 2004 15:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Grand Gulf Standby Service Water "C" and High Pressure Core Spray Declared Inoperable 2021-09-09T05:33:00 | |
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