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On August 23, 2010, at approximately 2210 … On August 23, 2010, at approximately 2210 hours, with the Palisades unit at 100% power, the turbine protection relays, 305L and 305R, were identified as being inoperable due to a loss of electrical power from their 125 VDC power supply. On an actual turbine low auto stop oil pressure condition, 305L and 305R energize to generate a loss of load trip signal to all four channels of the Reactor Protection System (RPS). 305L provides input to RPS channels A and C. 305R provides input to RPS channels B and D. The RPS generates a reactor trip upon receipt of two (2) of four (4) loss of load trip signals. The loss of load trip is required by Technical Specification (TS) Limited Condition of Operation (LCO) 3.3.1 and was inoperable until 305L and 305R were reenergized on August 24, 2010, at approximately 0939 hours.</br>The on-shift operations crew entered a TS 3.3.1 LCO, however, TS 3.0.3 LCO should have also been entered. TS 3.0.3 LCO was applicable due to all four (4) loss of load input signals to the RPS being inoperable. The eight (8) hour notification was not reported within the required time frame due to a misinterpretation of the event that has since been re-evaluated and determined to meet the eight hour immediate notification requirement.</br>The safety significance of this even was minimal. Although required by TS, the loss of load trip function is not credited in the plant safety analysis.</br>The licensee has informed the NRC Resident Inspector.e has informed the NRC Resident Inspector. +
02:10:00, 24 August 2010 +
46,221 +
15:34:00, 1 September 2010 +
02:10:00, 24 August 2010 +
On August 23, 2010, at approximately 2210 … On August 23, 2010, at approximately 2210 hours, with the Palisades unit at 100% power, the turbine protection relays, 305L and 305R, were identified as being inoperable due to a loss of electrical power from their 125 VDC power supply. On an actual turbine low auto stop oil pressure condition, 305L and 305R energize to generate a loss of load trip signal to all four channels of the Reactor Protection System (RPS). 305L provides input to RPS channels A and C. 305R provides input to RPS channels B and D. The RPS generates a reactor trip upon receipt of two (2) of four (4) loss of load trip signals. The loss of load trip is required by Technical Specification (TS) Limited Condition of Operation (LCO) 3.3.1 and was inoperable until 305L and 305R were reenergized on August 24, 2010, at approximately 0939 hours.</br>The on-shift operations crew entered a TS 3.3.1 LCO, however, TS 3.0.3 LCO should have also been entered. TS 3.0.3 LCO was applicable due to all four (4) loss of load input signals to the RPS being inoperable. The eight (8) hour notification was not reported within the required time frame due to a misinterpretation of the event that has since been re-evaluated and determined to meet the eight hour immediate notification requirement.</br>The safety significance of this even was minimal. Although required by TS, the loss of load trip function is not credited in the plant safety analysis.</br>The licensee has informed the NRC Resident Inspector.e has informed the NRC Resident Inspector. +
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100 +
00:00:00, 1 September 2010 +
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05:53:33, 24 February 2020 +
15:34:00, 1 September 2010 +
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8.558 d (205.4 hours, 1.223 weeks, 0.281 months) +
02:10:00, 24 August 2010 +
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