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.