ENS 52805
ENS Event | |
|---|---|
14:53 Apr 16, 2017 | |
| Title | Invalid Edg Actuation During Surveillance Testing |
| Event Description | This is to report the Salem Unit 2, 2C Emergency Diesel Generator (EDG) actuation due to an invalid signal.
This report is being made per paragraphs 10CFR50.73(a)(1) and 10CFR50.73(a)(2)(iv)(A) to address the invalid actuation of the 2C EDG on April 16, 2017, while performing the 2C Safeguards Equipment Controller (SEC) Mode OPS Surveillance test. Plant conditions: Salem Unit 2 was in mode 5 at the time of the invalid actuation. On April 16, 2017, at approximately 1053 [EDT] while performing Solid State Protection System (SSPS) testing of the 2C SEC, the 2C Emergency Diesel Generator (EDG) output breaker was manually opened per the associated procedure step. The EDG output breaker unexpectedly reclosed and the 2C 4kV vital bus loaded onto the EDG in SEC Mode 2. The cause of the 2C EDG output breaker reclosure and 2C 4kV Vital bus loading during testing was determined to be two faulty input block switches in the 2C SEC. When Step 5.2.27 of the test procedure was performed, the 2C SEC 'input block' switches failed to block a 'blackout' actuation signal. This resulted in the breaker reclosure and loading of the 2C Vital Bus onto the EDG. Trouble shooting identified that the two failed switches exhibited high resistance across the switch contacts which is indicative of being in a 'fail to block' (the input signal) condition. The licensee has notified the NRC Resident Inspector. The licensee will also notify the States of New Jersey and Delaware. |
| Where | |
|---|---|
Salem  New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1436.65 h59.86 days <br />8.551 weeks <br />1.968 months <br />) | |
| Opened: | Matthew Mog 11:32 Jun 15, 2017 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Jun 15, 2017 |
| 52805 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 537862018-10-15T04:00:00015 October 2018 04:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Auxiliary Feedwater Pump Actuation ENS 528052017-04-16T14:53:00016 April 2017 14:53:00 10 CFR 50.73(a)(1), Submit an LER Invalid Edg Actuation During Surveillance Testing ENS 520072016-04-18T01:04:00018 April 2016 01:04:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generator ENS 516242015-10-29T16:12:00029 October 2015 16:12:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Unit 2 2C Safeguards Equipment Cabinet ENS 486672012-11-14T20:58:00014 November 2012 20:58:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Telephone Notification of an Invalid Reactor Trip Actuation in Mode 4 ENS 438892007-10-13T15:13:00013 October 2007 15:13:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Ler Report - 1C Edg Invalid Start ENS 434282007-04-17T02:23:00017 April 2007 02:23:00 10 CFR 50.73(a)(1), Submit an LER Invalid Esf Actuation During Refueling Outage ENS 408062004-04-12T19:43:00012 April 2004 19:43:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Notification of Invalid Actuation of Safety Injection Signal 2018-10-15T04:00:00 | |