ENS 42967
ENS Event | |
|---|---|
23:28 Sep 8, 2006 | |
| Title | Half Scram Signal Due to Equipment Failure |
| Event Description | On September 8, 2006 at approximately 1828, with the James A. FitzPatrick Nuclear Power Plant (JAF) operating at 98% reactor power, an equipment malfunction occurred, resulting in the tripping of one of the two 'B' Reactor Protection System (RPS) motor generator Electrical Protection Assembly (EPA) breakers. This caused a corresponding loss of power to the 'B' RPS bus, a half scram and primary containment isolation valve closures. Appropriate actions were taken in accordance with Abnormal Operating Procedure (AOP)-60, 'Loss of RPS Bus B Power.' All equipment operated as designed as a result of the loss of power to the 'B' RPS bus.
At 1859, the 'B' RPS bus was placed on the alternate power supply. At approximately 1905, the RPS half scram and Primary Containment Isolation System (PCIS) isolation signal was reset. Restoration of the various isolated systems commenced shortly thereafter. The reactor remained at 98% power throughout the event and Technical Specifications (TS) Limiting Condition for Operation (LCO) Actions were entered for the affected equipment as required. The above event meets the reporting criteria of 10 CFR 50.73(a)(2)(iv)(a) since the loss of RPS bus resulted in primary containment isolation signals affecting containment isolation valves in more than one system. The following systems or components isolated as a result of the loss of 'B' RPS bus: Reactor Water Cleanup, Reactor Building Ventilation, 'B' Containment Atmosphere Dilution, Torus Vent and Purge, Drywall Equipment and Floor Drain Sumps, 'B' Drywall Containment Atmospheric Monitors, Recirculation System Sample Line, Main Steam Line Drains, Residual Heat Removal drain valve to radwaste, Standby Gas Treatment (auto initiated). Since the signal was invalid (the result of loss of power vs. an actual containment isolation condition), this event meets the criteria in 10 CFR 50.73(a)(1) for being reported as a 60 day telephone notification in lieu of a written LER. The loss of the 'B' RPS bus was caused by the tripping of one of the two in-series 'B' RPS motor generator EPA breakers. A Failure Modes and Effects Analysis was completed for the EPA breaker. Potential failure modes were evaluated and ruled out with the exception of failure of a subcomponent on the EPA breaker logic card. The logic card and breaker were replaced, restoring the 'B' RPS motor generator to service. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
FitzPatrick  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| LER: | 05000333/LER-2023-002 Reactor Protection System Electric Power Monitoring System Trip Caused Primary Containment Isolation |
| Time - Person (Reporting Time:+1403.38 h58.474 days <br />8.353 weeks <br />1.922 months <br />) | |
| Opened: | Tim Page 11:51 Nov 6, 2006 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Nov 6, 2006 |
| 42967 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 42967\u003C/a\u003E - \u003Ca href=\"/FitzPatrick\" title=\"FitzPatrick\"\u003EFitzPatrick\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EHalf Scram Signal Due to Equipment Failure\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 42967 - FitzPatrick\n","link":"","lat":43.52241111111111,"lon":-76.39899444444444,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (98 %) |
| After | Power Operation (98 %) |
WEEKMONTHYEARENS 526452017-01-31T19:25:00031 January 2017 19:25:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Report Due to Invalid Eccs Actuation Signal ENS 514802015-08-23T16:42:00023 August 2015 16:42:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Primary Containment Isolation Signal ENS 491792013-05-10T05:41:00010 May 2013 05:41:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification of Invalid Actuation of an Emergency Diesel Generator ENS 485812012-10-13T07:18:00013 October 2012 07:18:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report- Invalid Specified System Actuation ENS 485522012-10-02T14:37:0002 October 2012 14:37:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation Signal of the Primary Containment Isolation Level Transmitter ENS 446742008-10-14T16:06:00014 October 2008 16:06:00 10 CFR 50.73(a)(1), Submit an LER Faulty Voltage Regulator Causes Half Scram ENS 446732008-09-25T07:41:00025 September 2008 07:41:00 10 CFR 50.73(a)(1), Submit an LER Loose Connection Causes Half Scram While Shutdown ENS 442962008-05-31T16:06:00031 May 2008 16:06:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Report Involving an Invalid Group II Primary Containment Isolation ENS 433322007-04-12T10:20:00012 April 2007 10:20:00 10 CFR 50.73(a)(1), Submit an LER Primary Containment Isolation Due to Loss of Rps Power Supply ENS 429672006-09-08T23:28:0008 September 2006 23:28:00 10 CFR 50.73(a)(1), Submit an LER Half Scram Signal Due to Equipment Failure ENS 418782005-06-03T21:05:0003 June 2005 21:05:00 10 CFR 50.73(a)(1), Submit an LER Half Scram on Voltage Regulator Failure ENS 415552005-02-14T12:18:00014 February 2005 12:18:00 10 CFR 50.73(a)(1), Submit an LER Inadvertant Safety System Actuation During Maintenance ENS 412142004-10-08T01:55:0008 October 2004 01:55:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Report Due to an Invalid Actuation of Eccs and Edgs During Surveillance Activities ENS 411842004-10-07T07:44:0007 October 2004 07:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation 2017-01-31T19:25:00 | |