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On June 3, 2005 at approximately 1705, wit … On June 3, 2005 at approximately 1705, with the James A. FitzPatrick Nuclear Power Plant (JAF) operating at 100% reactor power, a failure of the 'A' Reactor Protection System (RPS) motor generator voltage regulator occurred, resulting in a loss of power to the 'A' RPS bus, a half scram and multiple system isolations. The voltage transient caused by Technical Specification required RPS testing revealed the voltage regulator failure. Appropriate actions were taken in accordance with Abnormal Operating Procedure (AOP)-59, Loss of RPS Bus. All equipment operated as designed as a result of the loss of power to the RPS bus.</br>At 1744, the 'A' RPS bus was placed on the alternate power supply and the half scram was reset. The Primary Containment Isolation System (PCIS) isolation signal was reset at 1805 and restoration of the various isolated systems commenced shortly thereafter. The reactor remained at 100% reactor power throughout the event and Limiting Conditions for Operation were entered for the affected equipment as required.</br>The above event meets the reporting criteria of 10 CFR 50.73(a)(2)(iv)(a) since the loss of RPS bus resulted in general containment isolation signals affecting containment isolation valves in more than one system. The following systems or components isolated as a result of the loss of RPS bus:</br>Reactor Water Cleanup, Reactor Building Ventilation, 'A' Containment Atmosphere Dilution, Torus Vent and Purge, Drywell Equipment and Floor Drain Sumps, 'A' Drywell Containment Atmospheric Monitors, Recirculation System Sample Line, Main Steam Line Drains, Residual Heat Removal drain valve to radwaste, Standby Gas Treatment (auto Initiated).</br>Since the signal was invalid (the result of loss of power vs, an actual containment isolation condition), this event meets the criteria in 10 CFR 50.73(a)(1) for being reported as a 60 day telephone notification In lieu of a written LER.</br>The event was entered into the corrective action program. The loss of the 'A' RPS bus was caused by the failure of a uni-junction transistor (UJT) in the voltage regulator of the 'A' RPS motor generator, which resulted in an overvoltage condition and resultant protective trip. The voltage regulator was replaced with a spare from stock with a UJT from a different manufacturer. Other corrective actions include changing manufacturer's of the UJT (the former vendor no longer makes this UJT), and replacing the 'B' motor generator and alternate power supply voltage regulators with ones having new UJTs.</br>The licensee notified the NRC Resident Inspector and the state Public Service Commission.r and the state Public Service Commission.
21:05:00, 3 June 2005 +
41,878 +
10:21:00, 28 July 2005 +
21:05:00, 3 June 2005 +
On June 3, 2005 at approximately 1705, wit … On June 3, 2005 at approximately 1705, with the James A. FitzPatrick Nuclear Power Plant (JAF) operating at 100% reactor power, a failure of the 'A' Reactor Protection System (RPS) motor generator voltage regulator occurred, resulting in a loss of power to the 'A' RPS bus, a half scram and multiple system isolations. The voltage transient caused by Technical Specification required RPS testing revealed the voltage regulator failure. Appropriate actions were taken in accordance with Abnormal Operating Procedure (AOP)-59, Loss of RPS Bus. All equipment operated as designed as a result of the loss of power to the RPS bus.</br>At 1744, the 'A' RPS bus was placed on the alternate power supply and the half scram was reset. The Primary Containment Isolation System (PCIS) isolation signal was reset at 1805 and restoration of the various isolated systems commenced shortly thereafter. The reactor remained at 100% reactor power throughout the event and Limiting Conditions for Operation were entered for the affected equipment as required.</br>The above event meets the reporting criteria of 10 CFR 50.73(a)(2)(iv)(a) since the loss of RPS bus resulted in general containment isolation signals affecting containment isolation valves in more than one system. The following systems or components isolated as a result of the loss of RPS bus:</br>Reactor Water Cleanup, Reactor Building Ventilation, 'A' Containment Atmosphere Dilution, Torus Vent and Purge, Drywell Equipment and Floor Drain Sumps, 'A' Drywell Containment Atmospheric Monitors, Recirculation System Sample Line, Main Steam Line Drains, Residual Heat Removal drain valve to radwaste, Standby Gas Treatment (auto Initiated).</br>Since the signal was invalid (the result of loss of power vs, an actual containment isolation condition), this event meets the criteria in 10 CFR 50.73(a)(1) for being reported as a 60 day telephone notification In lieu of a written LER.</br>The event was entered into the corrective action program. The loss of the 'A' RPS bus was caused by the failure of a uni-junction transistor (UJT) in the voltage regulator of the 'A' RPS motor generator, which resulted in an overvoltage condition and resultant protective trip. The voltage regulator was replaced with a spare from stock with a UJT from a different manufacturer. Other corrective actions include changing manufacturer's of the UJT (the former vendor no longer makes this UJT), and replacing the 'B' motor generator and alternate power supply voltage regulators with ones having new UJTs.</br>The licensee notified the NRC Resident Inspector and the state Public Service Commission.r and the state Public Service Commission.
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100 +
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54.553 d (1,309.27 hours, 7.793 weeks, 1.793 months) +
21:05:00, 3 June 2005 +
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