ENS 44674
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ENS Event | |
|---|---|
16:06 Oct 14, 2008 | |
| Title | Faulty Voltage Regulator Causes Half Scram |
| Event Description | On 10/14/2008 at approximately 1106 [EDT], the James A. FitzPatrick Nuclear Power Plant was operating at approximately 99% power in Mode 1. The 'A' Reactor Protective System (RPS) Motor-Generator (MG) Set tripped. This resulted in a half-scram signal and Group II Primary Containment Isolation System [PCIS] actuation. The Group II PCIS isolation actuated valves in multiple systems.
During the event all systems operated as designed. Power was restored to 'A' RPS using the alternate power supply and the Group II PCIS isolation was reset. The cause of the event was determined to be a failure of the 'A' RPS MG Set voltage regulator. The voltage regulator was replaced and the RPS System was returned to its normal line-up. Initial troubleshooting on the failed voltage regulator determined that a Silicone Control Rectifier failed. The voltage regulator was sent off-site for further analysis to determine the cause of failure. The event is reportable under 10 CFR 50.73(a)(2)(iv)(A) 'Any event or condition that resulted in manual or automatic actuation of ...(B)(2) general containment isolation signals affecting containment isolation valves in more than one system'. A telephone notification is being made in lieu of an LER, pursuant to 10 CFR 50.73 (a)(1) as an invalid signal. The voltage regulator had been replaced approximately three weeks before this failure. (See EN#44673) 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 | |
| Time - Person (Reporting Time:+906.6 h37.775 days <br />5.396 weeks <br />1.242 months <br />) | |
| Opened: | Eugene Dorman 11:42 Nov 21, 2008 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Nov 21, 2008 |
| 44674 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (99 %) |
| After | Power Operation (99 %) |
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 | |
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