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On June 24, 2001, with both Point Beach Nu … On June 24, 2001, with both Point Beach Nuclear Plant (PBNP) Units operating at full load, one of the PBNP standby emergency power supplies, emergency diesel generator (EDG) G-03, tripped from near full power during performance of a monthly surveillance test. The redundant standby emergency power supplies were aligned to the proper safeguards buses in accordance with plant procedures and the Technical Specifications. G-03 was declared out of service and investigated for the cause of the trip. Contrary to the statements in the bases for TS 15.3.7, neither the common cause evaluation of the G-03 trip nor the requirement to start the redundant standby emergency power supplies were completed within 24 hours of the failure. This constitutes a condition prohibited by the TS and is reportable under 10 CFR 50.73. The evaluation of the G-03 trip determined that the components which caused the trip, which occurred while the EDG was in the exercise mode, would not have prohibited the EDG from performing its safety function in the event of an actual demand. Proposed corrective actions, including additional procedure remarks and implementation of ITS, should make it unlikely to overlook these testing and evaluation requirements in the future. The safety significance of this event was negligible.significance of this event was negligible. +
June 24, 2001 +
On June 24, 2001, with both Point Beach Nu … On June 24, 2001, with both Point Beach Nuclear Plant (PBNP) Units operating at full load, one of the PBNP standby emergency power supplies, emergency diesel generator (EDG) G-03, tripped from near full power during performance of a monthly surveillance test. The redundant standby emergency power supplies were aligned to the proper safeguards buses in accordance with plant procedures and the Technical Specifications. G-03 was declared out of service and investigated for the cause of the trip. Contrary to the statements in the bases for TS 15.3.7, neither the common cause evaluation of the G-03 trip nor the requirement to start the redundant standby emergency power supplies were completed within 24 hours of the failure. This constitutes a condition prohibited by the TS and is reportable under 10 CFR 50.73. The evaluation of the G-03 trip determined that the components which caused the trip, which occurred while the EDG was in the exercise mode, would not have prohibited the EDG from performing its safety function in the event of an actual demand. Proposed corrective actions, including additional procedure remarks and implementation of ITS, should make it unlikely to overlook these testing and evaluation requirements in the future. The safety significance of this event was negligible.significance of this event was negligible. +
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4 +
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15:10:38, 27 November 2017 +
August 1, 2001 +
June 24, 2001 +
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