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On August 29th, 2003 at approximately 1025 … On August 29th, 2003 at approximately 1025 EDT, an electrical perturbation affecting both Unit 1 & 2 at PPL Susquehanna LLC resulted in a partial isolation of Primary Containment Isolation valves on Division 1, specifically A & B Containment Radiation Monitors and the Containment Instrument Gas Purge supply valve.</br>This event is being reported as an invalid system actuation and is reportable under 10CFR 50.73(a)(2)(iv)(A). The condition meets the criteria of 10CFR 50.73(a)(2)(iv)(B)(2) due to a general containment isolation signal that affected containment isolation valves in more than one system. This notification is being provided via 60 day optional phone call as permitted under 10CFR 50.73(a)(1) in lieu of a written LER.</br>The event was initiated when Operators were returning a Unit 1 13.8 KV Non-ESS breaker back in service following routine maintenance. When the breaker was restored to its closed position, a fault downstream of the breaker caused it to immediately re-open. The 13.8 Kv system supplies power to both unit's Division 14kV ESS busses. The perturbation was sufficient to cause several 'fail closed' containment isolation valves to actuate and close. The transient caused other non-safety related plant equipment to trip/auto-start, no other safety-related equipment or functions were lost. There also were no challenges to the reactor systems or containments. All plant equipment and/or systems were capable of being restored to their original alignment. The fault that caused the electrical perturbation originated at a non-ESS transformer and is currently being replaced.</br>The licensee will inform the NRC Resident Inspector.e licensee will inform the NRC Resident Inspector. +
14:25:00, 29 August 2003 +
01:07:00, 19 September 2003 +
14:25:00, 29 August 2003 +
On August 29th, 2003 at approximately 1025 … On August 29th, 2003 at approximately 1025 EDT, an electrical perturbation affecting both Unit 1 & 2 at PPL Susquehanna LLC resulted in a partial isolation of Primary Containment Isolation valves on Division 1, specifically A & B Containment Radiation Monitors and the Containment Instrument Gas Purge supply valve.</br>This event is being reported as an invalid system actuation and is reportable under 10CFR 50.73(a)(2)(iv)(A). The condition meets the criteria of 10CFR 50.73(a)(2)(iv)(B)(2) due to a general containment isolation signal that affected containment isolation valves in more than one system. This notification is being provided via 60 day optional phone call as permitted under 10CFR 50.73(a)(1) in lieu of a written LER.</br>The event was initiated when Operators were returning a Unit 1 13.8 KV Non-ESS breaker back in service following routine maintenance. When the breaker was restored to its closed position, a fault downstream of the breaker caused it to immediately re-open. The 13.8 Kv system supplies power to both unit's Division 14kV ESS busses. The perturbation was sufficient to cause several 'fail closed' containment isolation valves to actuate and close. The transient caused other non-safety related plant equipment to trip/auto-start, no other safety-related equipment or functions were lost. There also were no challenges to the reactor systems or containments. All plant equipment and/or systems were capable of being restored to their original alignment. The fault that caused the electrical perturbation originated at a non-ESS transformer and is currently being replaced.</br>The licensee will inform the NRC Resident Inspector.e licensee will inform the NRC Resident Inspector. +
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00:00:00, 19 September 2003 +
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02:25:11, 2 March 2018 +
01:07:00, 19 September 2003 +
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20.446 d (490.7 hours, 2.921 weeks, 0.672 months) +
14:25:00, 29 August 2003 +
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