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During a review of the dedicated shutdown … During a review of the dedicated shutdown procedure (20.000.18), several possible design and operating procedure deficiencies were identified affecting Appendix R events. BOP Battery Charger 2C-1 is relied upon to feed post fire emergency shutdown loads. It was determined that although a circuit breaker supplying power to battery charger 2C-1 was re-closed by procedure, an additional action was required to place the battery charger in service. The BOP battery charger 2C-1 contactor circuit logic requires the control switch first be returned to the off-reset position, before the contactor can be re-energized. That control switch and associated control wiring is located in the control room envelope that is evacuated in an Appendix R fire scenario. Furthermore, the dedicated shutdown logic does not isolate this control switch circuitry from cables in the fire affected zone which is a requirement of the Appendix R circuit design.</br>In addition to the same issues identified for battery charger 2C-1, it was determined that the dedicated shutdown procedure did not provide for closure of the circuit breaker feeding power to battery charger 2C1-2. Battery charger 2C1-2 is required to power 260VDC motor operated valves used by the standby feedwater system to provide reactor cooling water and to control reactor water level after a shutdown due to an Appendix R fire. For both of these problems, power would be initially supplied by the associated batteries, but the batteries are not sized to provide power for the entire duration of the Appendix-R event. Therefore, when the plant must be shutdown from outside of the control room, a safe shutdown cannot be assured using the dedicated shutdown panel. This event is being reported as an unanalyzed condition under 50.72(b)(3)(ii)(B).</br>The affected Appendix R equipment was declared inoperable, and procedure changes to address this issue are being considered to address these conditions. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.
22:50:00, 18 May 2005 +
19:27:00, 18 May 2005 +
22:50:00, 18 May 2005 +
During a review of the dedicated shutdown … During a review of the dedicated shutdown procedure (20.000.18), several possible design and operating procedure deficiencies were identified affecting Appendix R events. BOP Battery Charger 2C-1 is relied upon to feed post fire emergency shutdown loads. It was determined that although a circuit breaker supplying power to battery charger 2C-1 was re-closed by procedure, an additional action was required to place the battery charger in service. The BOP battery charger 2C-1 contactor circuit logic requires the control switch first be returned to the off-reset position, before the contactor can be re-energized. That control switch and associated control wiring is located in the control room envelope that is evacuated in an Appendix R fire scenario. Furthermore, the dedicated shutdown logic does not isolate this control switch circuitry from cables in the fire affected zone which is a requirement of the Appendix R circuit design.</br>In addition to the same issues identified for battery charger 2C-1, it was determined that the dedicated shutdown procedure did not provide for closure of the circuit breaker feeding power to battery charger 2C1-2. Battery charger 2C1-2 is required to power 260VDC motor operated valves used by the standby feedwater system to provide reactor cooling water and to control reactor water level after a shutdown due to an Appendix R fire. For both of these problems, power would be initially supplied by the associated batteries, but the batteries are not sized to provide power for the entire duration of the Appendix-R event. Therefore, when the plant must be shutdown from outside of the control room, a safe shutdown cannot be assured using the dedicated shutdown panel. This event is being reported as an unanalyzed condition under 50.72(b)(3)(ii)(B).</br>The affected Appendix R equipment was declared inoperable, and procedure changes to address this issue are being considered to address these conditions. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.
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