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On September 26, 2001, Florida Power Corpo … On September 26, 2001, Florida Power Corporation's (FPC's) Crystal River Unit 3 (CR-3) was in MODE 1 (POWER OPERATION) at 100 percent RATED THERMAL POWER. While performing surveillance procedure SP-650, "ASME Code Safety Valve Test," on the `A' Once Through Steam Generator (OTSG) main steam safety valves (MSSVs) MSV-33 and MSV-42 setpoints were found outside their required tolerance. Improved Technical Specification (ITS) 3.7.1 states that the MSSVs shall be operable as specified in Table 3.7.1-1 in MODES 1, 2 and 3. With one or more required MSSVs inoperable, THERMAL POWER shall be reduced to less than the reduced power limit of Table 3.7.1-1 within 4 hours and the nuclear overpower trip setpoint shall be reduced in accordance with Table 3.7.1-1 within 12 hours. The existence of similar discrepancies in multiple relief valves is an indication that the discrepancies may have developed over a period of time. Therefore, FPC concludes that the condition existed during plant operation and the event is reportable under 10CFR50.73(a)(2)(i)(B) as a condition prohibited by ITS. This condition does not represent a reduction in the public health and safety. The most probable causes for this condition were disc/seat bonding and/or aging. MSV-33 and MSV-42 were adjusted and/or retested satisfactorily. Previous similar occurrences within the last three years have been identified that were not reported to the NRC.ntified that were not reported to the NRC. +
On September 26, 2001, Florida Power Corpo … On September 26, 2001, Florida Power Corporation's (FPC's) Crystal River Unit 3 (CR-3) was in MODE 1 (POWER OPERATION) at 100 percent RATED THERMAL POWER. While performing surveillance procedure SP-650, "ASME Code Safety Valve Test," on the `A' Once Through Steam Generator (OTSG) main steam safety valves (MSSVs) MSV-33 and MSV-42 setpoints were found outside their required tolerance. Improved Technical Specification (ITS) 3.7.1 states that the MSSVs shall be operable as specified in Table 3.7.1-1 in MODES 1, 2 and 3. With one or more required MSSVs inoperable, THERMAL POWER shall be reduced to less than the reduced power limit of Table 3.7.1-1 within 4 hours and the nuclear overpower trip setpoint shall be reduced in accordance with Table 3.7.1-1 within 12 hours. The existence of similar discrepancies in multiple relief valves is an indication that the discrepancies may have developed over a period of time. Therefore, FPC concludes that the condition existed during plant operation and the event is reportable under 10CFR50.73(a)(2)(i)(B) as a condition prohibited by ITS. This condition does not represent a reduction in the public health and safety. The most probable causes for this condition were disc/seat bonding and/or aging. MSV-33 and MSV-42 were adjusted and/or retested satisfactorily. Previous similar occurrences within the last three years have been identified that were not reported to the NRC.ntified that were not reported to the NRC. +
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05:31:01, 1 December 2017 +
Main Steam Safety Valve Setpoints Outside Required Tolerance Longer Than Allowed By Technical Specifications +
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