ENS 54364
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ENS Event | |
|---|---|
07:16 Nov 1, 2019 | |
| Title | High Pressure Core Spray (Hpcs) System Inoperable |
| Event Description | On November 1, 2019 at 0316 EDT, Nine Mile Point Unit 2 (NMP2) received Control Room annunciation for HPCS SYSTEM INOPERABLE and inoperable status light indication for TRIP UNITS OUT OF FILE/POWER FAIL. Initial investigation has identified a potential failed 24 vdc power supply which supplies power to the HPCS trip units for system initiation and control. The HPCS system has been declared inoperable per TS 3.5.1 resulting in an unplanned 14 day LCO.
All other plant systems functioned as required. NMP2 is currently at 100 percent power in Mode 1. This condition is reportable under 10 CFR 50.72(b)(3)(v)(D) as, 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to: (D) Mitigate the consequences of an accident.' The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000410/LER-2019-001 High Pressure Core Spray Declared Inoperable |
| Time - Person (Reporting Time:+2.78 h0.116 days <br />0.0165 weeks <br />0.00381 months <br />) | |
| Opened: | Carl Jones 10:03 Nov 1, 2019 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Nov 1, 2019 |
| 54364 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Nine Mile Point with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 546922020-05-03T21:50:0003 May 2020 21:50:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Main Control Room Air Treatment System Inoperable ENS 543642019-11-01T07:16:0001 November 2019 07:16:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray (Hpcs) System Inoperable ENS 502962014-07-22T17:43:00022 July 2014 17:43:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Diesel Generator for High Pressure Core Spray Declared Inoperable During Surveillance Testing ENS 498592014-02-27T08:30:00027 February 2014 08:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray (Hpcs) System Declared Inoperable ENS 490292013-05-14T16:15:00014 May 2013 16:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Steam Flow Isolation Capability Identified as Non-Functional ENS 487942013-02-28T18:19:00028 February 2013 18:19:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Pump Failure ENS 486962013-01-23T20:16:00023 January 2013 20:16:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Concurrent Loss of High Pressure Reactor Makeup Systems Capability ENS 479672012-05-25T17:22:00025 May 2012 17:22:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident De-Energization of Both Divisions of Rhr Suction Line Primary Containment Isolations Valves During Testing ENS 452842009-08-23T21:50:00023 August 2009 21:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unplanned Inoperability of the High Pressure Core Spray System ENS 442062008-05-13T12:25:00013 May 2008 12:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Loss of Offsite Power ENS 409202004-08-03T14:46:0003 August 2004 14:46:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Rendered Inoperable Due to Faulty Test Equipment ENS 405062004-02-05T18:40:0005 February 2004 18:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Emergency Diesel Generator Ventilation Exhaust Damper Covered with Snow and Ice 2020-05-03T21:50:00 | |
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