ENS 40173
ENS Event | |
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14:25 Aug 29, 2003 | |
Title | Invalid Actuation of Containment Isolation Valves |
Event Description | On August 29th, 2003 at approximately 1025 EDT, an electrical perturbation affecting both Unit 1 & 2 at PPL Susquehanna LLC resulted in a partial isolation of Primary Containment Isolation valves on Division 1, specifically A & B Containment Radiation Monitors and the Containment Instrument Gas Purge supply valve.
This event is being reported as an invalid system actuation and is reportable under 10CFR 50.73(a)(2)(iv)(A). The condition meets the criteria of 10CFR 50.73(a)(2)(iv)(B)(2) due to a general containment isolation signal that affected containment isolation valves in more than one system. This notification is being provided via 60 day optional phone call as permitted under 10CFR 50.73(a)(1) in lieu of a written LER. The event was initiated when Operators were returning a Unit 1 13.8 KV Non-ESS breaker back in service following routine maintenance. When the breaker was restored to its closed position, a fault downstream of the breaker caused it to immediately re-open. The 13.8 Kv system supplies power to both unit's Division 14kV ESS busses. The perturbation was sufficient to cause several 'fail closed' containment isolation valves to actuate and close. The transient caused other non-safety related plant equipment to trip/auto-start, no other safety-related equipment or functions were lost. There also were no challenges to the reactor systems or containments. All plant equipment and/or systems were capable of being restored to their original alignment. The fault that caused the electrical perturbation originated at a non-ESS transformer and is currently being replaced. The licensee will inform the NRC Resident Inspector. |
Where | |
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Susquehanna Pennsylvania (NRC Region 1) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+490.7 h20.446 days <br />2.921 weeks <br />0.672 months <br />) | |
Opened: | Don E. Roland 01:07 Sep 19, 2003 |
NRC Officer: | Steve Sandin |
Last Updated: | Sep 19, 2003 |
40173 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 541032019-04-18T05:10:00018 April 2019 05:10:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification Due to Invalid Specified System Actuation ENS 527722017-04-03T01:27:0003 April 2017 01:27:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 480922012-05-14T13:28:00014 May 2012 13:28:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Emergency Service Water Actuation ENS 457262010-02-25T19:18:00025 February 2010 19:18:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 435552007-06-09T09:11:0009 June 2007 09:11:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the 'C' Emergency Diesel Generator ENS 424892006-03-11T09:32:00011 March 2006 09:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 407662004-04-04T18:57:0004 April 2004 18:57:00 10 CFR 50.73(a)(1), Submit an LER 60 -Day Report: Invalid Actuation of the "E" Emergency Diesel Generator ENS 407332004-03-21T16:32:00021 March 2004 16:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Signals in More than One System ENS 401732003-08-29T14:25:00029 August 2003 14:25:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves 2019-04-18T05:10:00 | |