ENS 47572
ENS Event | |
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15:44 Nov 7, 2011 | |
Title | 60-Day Report Involving an Invalid Edg Actuation Due to Technician Error |
Event Description | This 60-day telephone notification is being made pursuant to the requirements specified in 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) in lieu of submitting a written Licensee Event Report due to invalid actuation of an emergency AC electrical power system while removed from service for testing.
On November 7, 2011 with the Station at 100% power, the Emergency Diesel Generator 'B' (EDG 'B') output breaker closed unexpectedly resulting in the EDG being paralleled to the grid out of phase during the performance of the semi-annual fast start test required by Technical Specifications. The actuation of the EDG 'B' output breaker to close was determined to be invalid as it occurred while a technician was performing a required voltage check across a set of contacts in the output breaker circuit. The individual switched an analog multi-meter from the DC voltage range to resistance range while test leads were still in place across the test points. This action actuated the breaker closure relay, which caused the output breaker to close, placing the EDG 'B' in parallel to the grid. The EDG picked up load as expected until the output breaker was opened approximately 52 seconds later by an operator in the control room. A review of data from the event verified that the maximum rating of the EDG was not exceeded. Subsequent inspection and testing of the EDG 'B' and output breaker found no abnormalities as a result of the out of phase paralleling of the EDG 'B' to the grid. The NRC Resident Inspector has been notified. |
Where | |
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Kewaunee Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1414.98 h58.958 days <br />8.422 weeks <br />1.938 months <br />) | |
Opened: | Jack Gadzala 14:43 Jan 5, 2012 |
NRC Officer: | Steve Sandin |
Last Updated: | Jan 5, 2012 |
47572 - 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 %) |
WEEKMONTHYEARENS 475722011-11-07T15:44:0007 November 2011 15:44:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Report Involving an Invalid Edg Actuation Due to Technician Error ENS 455112009-09-27T22:48:00027 September 2009 22:48:00 10 CFR 50.73(a)(1), Submit an LER Optional 60-Day Telephonic Notification for Invalid Specified System Actuation ENS 411522004-09-15T14:11:00015 September 2004 14:11:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves 2011-11-07T15:44:00 | |