ENS 46070
ENS Event | |
|---|---|
04:00 May 17, 2010 | |
| Title | 60 Day Report - Invalid Actuation of Hpci and Rcic Systems |
| Event Description | Invalid Primary Containment And Vessel Isolation Control System (PCIS) signal results in partial actuation of Emergency Core Cooling System (ECCS) components:
The following information is provided as a sixty (60) day telephone notification to the NRC in accordance with 50.73(a)(1) in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of the high pressure coolant injection (HPCI) and reactor core isolation coolant (RCIC) systems. NUREG-1022, Revision 2, identifies the information that needs to be reported as discussed below. On May 17, 2010, during the Refueling Outage 28 ECCS test control room personnel identified the reactor vessel level was lowering. Valves HPCI-15 and 16 automatically isolated due to an invalid high steam flow isolation signal. The control room personnel immediately started both control rod drive (CRD) pumps as required by procedure. It was determined that the lowering of reactor vessel level was due to water flowing down the HPCI system and RCIC system turbine steam supply lines. The RCIC-15 valve was manually isolated terminating the event. At this time one CRD pump was secured. Acceptable water level in the reactor vessel was maintained throughout the event. The condition has been entered into the Vermont Yankee Nuclear Power Station Corrective Action Program for evaluation and implementation of corrective actions to preclude recurrence. The high steam flow isolation signal is considered invalid because: 1) At the time of the event, the unit mode switch was in a mode where PCIS was not required; 2) No steam was being generated; and 3) The water flow past differential pressure instrument generated a false high steam flow signal. The event is being reported in accordance with 50.73(a)(1) and 50.73(a)(2)(iv)(A) as an event or condition that as a result of an invalid initiation signal resulted in the actuation of one or more of the systems listed in paragraph 50.73 (a)(2)(iv)(B). The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Vermont Yankee File:NorthStar Vermont Yankee icon.png Vermont (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1207.63 h50.318 days <br />7.188 weeks <br />1.654 months <br />) | |
| Opened: | Andrew Wisniewski 11:38 Jul 6, 2010 |
| NRC Officer: | John Knoke |
| Last Updated: | Jul 6, 2010 |
| 46070 - NRC Website
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WEEKMONTHYEARENS 501642014-04-05T11:00:0005 April 2014 11:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation ENS 498252013-12-15T05:00:00015 December 2013 05:00:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephone Notification of Invalid Pcis System Actuation ENS 493582013-07-23T04:00:00023 July 2013 04:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Group 3 Actuation ENS 492112013-06-14T22:06:00014 June 2013 22:06:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to a Radiation Monitor Spike ENS 475002011-10-11T21:29:00011 October 2011 21:29:00 10 CFR 50.73(a)(1), Submit an LER Loss of Vital Ac Power While Shutdown ENS 460702010-05-17T04:00:00017 May 2010 04:00:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Hpci and Rcic Systems ENS 450092009-03-24T17:26:00024 March 2009 17:26:00 10 CFR 50.73(a)(1), Submit an LER Primary Containment Isolation System (Pcis) Group 3 Invalid Actuation ENS 437292007-09-15T04:00:00015 September 2007 04:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation ENS 421202005-11-04T21:08:0004 November 2005 21:08:00 10 CFR 50.73(a)(1), Submit an LER Temporary Loss of the Running Rhr Pump During a Bus Transfer ENS 422352005-11-03T00:01:0003 November 2005 00:01:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Containment Isolation Signal Affecting Containment Isolation Valves ENS 410042004-07-31T17:56:00031 July 2004 17:56:00 10 CFR 50.73(a)(1), Submit an LER Invalid Pcis Actuation ENS 403712003-10-31T05:00:00031 October 2003 05:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Group Iii Primary Containment Isolation System Actuation 2014-04-05T11:00:00 | |