ENS 43855
ENS Event | |
|---|---|
15:21 Nov 8, 2007 | |
| Title | Invalid Primary Containment Isolation System (Pcis) Actuation |
| Event Description | This 60-day telephone notification is being made under reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of the containment isolation signals affecting more than one system.
On November 8, 2007, at 1021 hours0.0118 days <br />0.284 hours <br />0.00169 weeks <br />3.884905e-4 months <br />, with Unit 2 shutdown for a planned mid-cycle outage to remove a defective fuel bundle and conduct other maintenance activities, two primary containment isolation valves in different systems closed unexpectedly. The valves closed during application of a clearance section that inadvertently created a false primary containment isolation signal. None of the plant conditions which require PCIS Group 5 or 7 actuation (low reactor water level, high reactor pressure, high area temperature, etc.) existed; therefore, these actuations are considered invalid. The following two primary containment isolation valve isolations/actuations occurred: - Residual Heat Removal shutdown cooling supply inside isolation valve (2RHS*MOV112, Group 5) - Reactor Water Cleanup supply from Reactor Coolant System and Reactor Pressure Vessel inside isolation valve (2WCS*MOV102, Group 7) The valves functioned successfully as they cycled completely from full open to full closed. The event was entered into NMP's corrective action program for evaluation and resolution. The NRC Senior Resident Inspector has been notified of this report. Reference corrective action document CR 2007-6769. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1006.23 h41.926 days <br />5.989 weeks <br />1.378 months <br />) | |
| Opened: | Anthony Petrelli 13:35 Dec 20, 2007 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Dec 20, 2007 |
| 43855 - NRC Website
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WEEKMONTHYEARENS 535842018-03-19T04:00:00019 March 2018 04:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 527472017-03-20T06:16:00020 March 2017 06:16:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification for an Invalid High Pressure Coolant Injection System Actuation ENS 509092015-01-21T15:00:00021 January 2015 15:00:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Notification - Invalid Containment Isolation Signal ENS 490842013-04-02T13:46:0002 April 2013 13:46:00 10 CFR 50.73(a)(1), Submit an LER 6O-Day Optional Telephone Notification for an Invalid Specified System Actuation ENS 485702012-10-12T14:12:00012 October 2012 14:12:00 10 CFR 50.73(a)(1), Submit an LER Temperature Switch Failure Causes Division I Isolation Signal ENS 481132012-05-24T14:20:00024 May 2012 14:20:00 10 CFR 50.73(a)(1), Submit an LER 60 - Day Optional Telephone Notification of an Invalid Division 2 Containment Isolation Signal ENS 475472011-11-08T03:31:0008 November 2011 03:31:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation Due to a Possible Faulty Temperature Switch ENS 457792010-03-15T16:43:00015 March 2010 16:43:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Start of Emergency Diesel Generator ENS 439232008-01-14T18:41:00014 January 2008 18:41:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Group 5 and Group 10 Primary Containment Valves During Surveillance Testing ENS 438552007-11-08T15:21:0008 November 2007 15:21:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation ENS 407182004-04-01T07:06:0001 April 2004 07:06:00 10 CFR 50.73(a)(1), Submit an LER Invalid Automatic Start of Emergency Diesel Generator During Surveillance Test 2018-03-19T04:00:00 | |