ENS 46966
ENS Event | |
|---|---|
01:44 Apr 25, 2011 | |
| Title | 60 Day Optional Notification Of Invalid Start Of Emergency Diesel Generator. |
| Event Description | This report is being made per paragraphs 50.73(a)(1) and 50.73(a)(2)(iv)(A) to address an actuation of the 'B' Emergency Diesel Generator on 4/24/11 while performing a test of the diesel generator load and safeguard sequence. Emergency AC Electrical Power system including Emergency Diesel Generators is a system named in 50.73(a)(2)(iv)(6).
On 4/24/11, at 2144, [hrs. EDT] while testing the continuity of relay SI-20X that is part of the test of diesel generator load and safeguard sequence, an unexpected partial Safety Injection signal occurred. The initiating action was the testing of the continuity of relay SI-20X while the 'B' train Safety Injection DC breaker was closed. Once the testing of relay SI-20X was completed, the partial Safety Injection signal ceased and all the equipment that had started, or had been repositioned, was returned to its pre-test condition. The unexpected partial Safety Injection signal was the result of the improper sequencing of a separate test of process radiation monitors that was being performed concurrently with the test of the diesel generator load and safeguard sequence. Specific information required per NUREG-1022: a. The specific train(s) and system(s) that were actuated: The 'B' Diesel Generator actuated. In addition, (a) equipment that started, or was repositioned, were the 'D' Service Water pump, the 'B' Control Room Emergency Air Treatment System (CREATS), and Emergency Core Cooling System (ECCS) valves 871B and 852B; and (b) equipment that stopped was the containment purge supply and exhaust fans, and Control Room Air Handling Unit supply and return fans. b. Whether each train actuation was complete or partial: The actuation was partial. c. Whether or not the system started and functioned successfully: The 'B' Emergency Diesel Generator started and operated successfully. It was later secured by Operations personnel. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Ginna  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1261.68 h52.57 days <br />7.51 weeks <br />1.728 months <br />) | |
| Opened: | Ron Fellows 15:25 Jun 16, 2011 |
| NRC Officer: | John Knoke |
| Last Updated: | Jun 16, 2011 |
| 46966 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 556092021-10-17T18:58:00017 October 2021 18:58:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification for Invalid Specified Actuation of Containment Isolation Train ENS 516042015-10-21T05:29:00021 October 2015 05:29:00 10 CFR 50.73(a)(1), Submit an LER Diesel Generator Start Due to Invalid Signal ENS 502312014-05-08T17:20:0008 May 2014 17:20:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Specified System Actuation ENS 470942011-06-03T04:39:0003 June 2011 04:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generator ENS 469662011-04-25T01:44:00025 April 2011 01:44:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Notification of Invalid Start of Emergency Diesel Generator. ENS 466242010-12-29T05:00:00029 December 2010 05:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation Due to Operator Error ENS 443202008-05-10T01:32:00010 May 2008 01:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Auxiliary Feedwater System Actuation ENS 403322003-10-08T07:16:0008 October 2003 07:16:00 10 CFR 50.73(a)(1), Submit an LER Invalid Safety Injection Signal During Surveillance Testing at Ginna ENS 403312003-09-27T20:44:00027 September 2003 20:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid Partial Safety Injection Signal During Surveillance Testing at Ginna 2021-10-17T18:58:00 | |