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On September 21, 2016, at 0142 Mountain St … On September 21, 2016, at 0142 Mountain Standard Time (MST), containment isolation valve SGA-UV-1134 failed to stroke closed from the control room during containment isolation valve testing. The failure resulted in an unplanned entry into Technical Specification Limiting Condition of Operation (LCO) 3.6.3, Containment Isolation Valves. On September 22, 2016, it was concluded the valve was in a configuration that rendered the pneumatic operator incapable of operating the valve, including remote operation and automatic closure in the event of a main steam isolation system signal. The valve had been in this configuration since last operated on June 28, 2016. Therefore, the valve was inoperable longer than the required 4-hour completion time of LCO 3.6.3 Condition C. On September 22, 2016, at 1457 MST, SGA-UV-1134 was properly closed, declared operable, and LCO 3.6.3 was exited.</br></br>This event was caused by human error when procedural guidance was not used to return SGA-UV-1134 to its neutral locked configuration following testing on June 28, 2016. Actions have been initiated to ensure proper procedural guidance is used to lock SGA-UV-1134 in the future.</br></br>On June, 26, 2015, LER 50-530/2015-002 reported a condition prohibited by LCO 3.0.4 that occurred on May 1, 2015, when Unit 3 entered Modes 4 and 3 while in the applicability of LCO 3.7.4. On May 2, 2015, automatic dump valve, SGB- HV-178, was stroked with steam while in Mode 3 and discovered to be inoperable due to human error incurred during post- maintenance assembly prior to entering Mode 4.tenance assembly prior to entering Mode 4. +
September 21, 2016 +
On September 21, 2016, at 0142 Mountain St … On September 21, 2016, at 0142 Mountain Standard Time (MST), containment isolation valve SGA-UV-1134 failed to stroke closed from the control room during containment isolation valve testing. The failure resulted in an unplanned entry into Technical Specification Limiting Condition of Operation (LCO) 3.6.3, Containment Isolation Valves. On September 22, 2016, it was concluded the valve was in a configuration that rendered the pneumatic operator incapable of operating the valve, including remote operation and automatic closure in the event of a main steam isolation system signal. The valve had been in this configuration since last operated on June 28, 2016. Therefore, the valve was inoperable longer than the required 4-hour completion time of LCO 3.6.3 Condition C. On September 22, 2016, at 1457 MST, SGA-UV-1134 was properly closed, declared operable, and LCO 3.6.3 was exited.</br></br>This event was caused by human error when procedural guidance was not used to return SGA-UV-1134 to its neutral locked configuration following testing on June 28, 2016. Actions have been initiated to ensure proper procedural guidance is used to lock SGA-UV-1134 in the future.</br></br>On June, 26, 2015, LER 50-530/2015-002 reported a condition prohibited by LCO 3.0.4 that occurred on May 1, 2015, when Unit 3 entered Modes 4 and 3 while in the applicability of LCO 3.7.4. On May 2, 2015, automatic dump valve, SGB- HV-178, was stroked with steam while in Mode 3 and discovered to be inoperable due to human error incurred during post- maintenance assembly prior to entering Mode 4.tenance assembly prior to entering Mode 4. +
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