ENS 43498
ENS Event | |
|---|---|
12:28 Jun 27, 2007 | |
| Title | Failed Relay Starts One Train of the Decay Heat River Water System |
| Event Description | This event is being reported via a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER. In this case, the telephone report is not considered an LER. This report is being made under 10CFR 50.73 (a)(2)(iv)(A).
During Engineered Safeguards Actuation System (ESAS) logic testing on June 27, 2007, an invalid actuation of the 'A' train of the Decay Heat River Water System (DR) occurred. The DR is comprised of the 'A' and 'B' trains, and serves as the reactor's ultimate heat sink. The ESAS has three independent input channels, which cause actuation in a two out of three logic. During ESAS logic testing, the channel under test is placed in the tripped state. Actuation relays in the other two channels should remain energized by the outputs from the other two channels not under test. The invalid actuation of the 'A' DR train during testing on June 27, 2007, was due to a failed ESAS relay in one of the other two channels not being tested. During this invalid actuation, the 'A' DR train was fully actuated. The operation of this normally standby system did not have any adverse impact on plant operation, nor any negative impact on the DR. The failed relay that caused the invalid actuation during ESAS logic testing did not impact the OPERABILITY of the ESAS, since the relay was failed in the actuated state. The failed relay was replaced on June 29, 2007. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Crane  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+482.82 h20.118 days <br />2.874 weeks <br />0.661 months <br />) | |
| Opened: | Adam Miller 15:17 Jul 17, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jul 17, 2007 |
| 43498 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 527672017-03-24T18:25:00024 March 2017 18:25:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation During Testing ENS 516952015-12-02T02:19:0002 December 2015 02:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Emergency Feedwater Actuation ENS 453242009-07-10T06:38:00010 July 2009 06:38:00 10 CFR 50.73(a)(1), Submit an LER Electrical Short Circuit Resulted in Partial High Pressure Injection ENS 447152008-10-24T18:18:00024 October 2008 18:18:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Actuation of Engineered Safeguards System from Relay Sensing Circuit ENS 434982007-06-27T12:28:00027 June 2007 12:28:00 10 CFR 50.73(a)(1), Submit an LER Failed Relay Starts One Train of the Decay Heat River Water System 2017-03-24T18:25:00 | |