ENS 48581
ENS Event | |
|---|---|
07:18 Oct 13, 2012 | |
| Title | 60 Day Report- Invalid Specified System Actuation |
| Event Description | Event Summary: On October 13, 2012, at approximately 0218 [EST], a full reactor scram signal was received in the James A. FitzPatrick (JAF) control room. At the time of this event, the plant was in cold shutdown (Mode 4) and refueling outage 20 (R20) was in progress. The scram signal occurred because Reactor Vessel Scram & Primary Containment Isolation Level Transmitter (02-3LT-101C) and Reactor Vessel Scram & Primary Containment Isolation Level Transmitter EQ (02-3LT-101D) momentarily failed downscale, and then immediately recovered.
02-3LT-101C is an 'A' division component and 02-3LT-101D is a 'B' division component. Therefore, both the 'A' and 'B' divisions of reactor protection actuated providing a full reactor scram and outboard primary containment isolation signal. AOP-15, 'Isolation Verification and Recovery' verified that the proper containment isolation response was received. This event is reportable under 10 CFR 50.73(a)(2)(iv)(A) because it resulted in the invalid actuation of the reactor protection system while the reactor was already shut down. Apparent Cause: A Failure Mode Analysis and Apparent Cause Evaluation were performed to determine the most likely cause of both level transmitters to momentarily spike downscale. It was concluded that the most probable cause was due to a worker inadvertently coming into contact with the level transmitters' exposed sensing lines. Contributing to this event was the misjudgment by the Operations individual reviewing the work package, on the risk significance of the instrumentation in the vicinity of the work area. As a result, the work area was not constructed in a manner to preclude interference with the level transmitters or associated sensing lines. Corrective Actions: Immediate corrective actions were to walk down the affected instrument lines to ensure no damage had been caused. Additional corrective actions were to install signs near the level transmitters and exposed sensing lines. The signs denote that sensitive instrument lines are present. Future corrective actions include a walk down by engineering and operations to identify other areas in the plant where sensitive instrument lines are present and place additional signs or barriers as appropriate. 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:+1444.2 h60.175 days <br />8.596 weeks <br />1.978 months <br />) | |
| Opened: | Henk Verwey 12:30 Dec 12, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Dec 12, 2012 |
| 48581 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
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 | |