ENS 43286
ENS Event | |
|---|---|
16:11 Jan 11, 2007 | |
| Title | Initiation of Invalid Primary Containment Isolation Signals |
| Event Description | This is not an L.E.R. The report is being made to the NRC under 10 CFR 50.73(a)(2)(iv)(A), and the 60 day telephone notification option under 10 CFR 50.73(a)(1). The event included invalid 'general containment isolation signals affecting containment isolation valves in more than one system' as discussed in 10 CFR 50.73(a)(2)(iv)(B).
(a) 'The specific train(s) and systems that were actuated.' On January 11, 2007 at 12:11 hours, Unit 2 received invalid Primary Containment Isolation signals to both Group 5 (RHR Shutdown Cooling System Isolation valves) and Group 10 (Reactor Core Isolation System Isolation valves) during instrumentation surveillance testing. While performing testing of the Division I Group 5 and Group 10 isolation functions of the RHR ambient temperature instrumentation, Technicians omitted a procedural step, resulting in the invalid signal actuations. (b) 'Whether each train actuation was complete or partial.' The event resulted in closure of the RCIC steam supply header outboard containment isolation valve. The Division 1 RHR Shutdown Cooling System isolation valves were already closed at the time of the isolation signal. (c) 'Whether or not the system started and functioned as designed,' The Primary Containment Isolation instrumentation logic and associated valve closure function (for RCIC) actuated as designed. The reporting of this event exceeds the 60 day notification requirement as a result of initially not fully understanding the impact of the invalid signal actuation. This condition has been entered into the Corrective Action Program. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+2039.65 h84.985 days <br />12.141 weeks <br />2.794 months <br />) | |
| Opened: | Chris Skinner 14:50 Apr 6, 2007 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 6, 2007 |
| 43286 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 493862013-09-25T19:30:00025 September 2013 19:30:00
[Table view]Other Unspec Reqmnt Environmental Impact During Service Water Mollusk Biocide Treatment ENS 432862007-01-11T16:11:00011 January 2007 16:11:00 Other Unspec Reqmnt Initiation of Invalid Primary Containment Isolation Signals ENS 423862006-03-03T23:00:0003 March 2006 23:00:00 Other Unspec Reqmnt Reactor Building Ventilation Flowpath Inoperable ENS 415002005-03-17T22:55:00017 March 2005 22:55:00 Other Unspec Reqmnt Other Unspecified Requirement - License Condition 2.F ENS 407492004-05-14T13:17:00014 May 2004 13:17:00 Other Unspec Reqmnt, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Change in the Methodology Used by Ge/Gnf to Demonstrate Compliance with Eccs Performance Requirements ENS 404872004-01-28T20:30:00028 January 2004 20:30:00 Other Unspec Reqmnt 24-Hour Condition of License Report Due to Inoperable Division II Control Room Special Filter Train 2013-09-25T19:30:00 | |