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On April 9, 2001, testing of the Unit 2 em … On April 9, 2001, testing of the Unit 2 emergency diesel generator D6 was being performed. At 0845, surveillance procedure SP2307, "D6 Diesel Generator 6 Month Fast Start Test" was begun as part of the requirement to complete surveillance procedure SP2335, "D6 DG 18 Month 24 Hour Load Test". At 0930, at the normal step in SP2307, D6 was removed from service and Technical Specification 3.7.B.1 was entered. Technical Specification (TS) 3.7.B.1. Limiting Condition for Operation (LCO) requires, in the event of the inoperability of one of the unit's two emergency diesel generators: "One diesel generator may be inoperable for 7 days provided . . . (d) the OPERABILITY of the two required paths from the grid shall be verified OPERABLE within 1 hour and at least once per 8 hours thereafter." For item (d), the OPERABILITY of the two required paths from the grid was Busses." However, at 0130 on April 10, 2001, it was discovered that the eight hour limit for the next verification had been exceeded. Eleven minutes later, at 0141, SP2118 was completed satisfactorily and within the eight hour limit thereafter until D6 was returned to service on April 17, 2001.</br></br>Several corrective actions to improve the surveillance procedures involved in grid verification, to improve clock management, and to improve shift turnover communications have been initiated to address issues determined to have contributed to this event.ermined to have contributed to this event. +
On April 9, 2001, testing of the Unit 2 em … On April 9, 2001, testing of the Unit 2 emergency diesel generator D6 was being performed. At 0845, surveillance procedure SP2307, "D6 Diesel Generator 6 Month Fast Start Test" was begun as part of the requirement to complete surveillance procedure SP2335, "D6 DG 18 Month 24 Hour Load Test". At 0930, at the normal step in SP2307, D6 was removed from service and Technical Specification 3.7.B.1 was entered. Technical Specification (TS) 3.7.B.1. Limiting Condition for Operation (LCO) requires, in the event of the inoperability of one of the unit's two emergency diesel generators: "One diesel generator may be inoperable for 7 days provided . . . (d) the OPERABILITY of the two required paths from the grid shall be verified OPERABLE within 1 hour and at least once per 8 hours thereafter." For item (d), the OPERABILITY of the two required paths from the grid was Busses." However, at 0130 on April 10, 2001, it was discovered that the eight hour limit for the next verification had been exceeded. Eleven minutes later, at 0141, SP2118 was completed satisfactorily and within the eight hour limit thereafter until D6 was returned to service on April 17, 2001.</br></br>Several corrective actions to improve the surveillance procedures involved in grid verification, to improve clock management, and to improve shift turnover communications have been initiated to address issues determined to have contributed to this event.ermined to have contributed to this event. +
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