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{{#ask: [[Originated by::Alan Gustafson]] [[Category:ENS Notification]]
 |?Entered date
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{
    "query_string": "[[Originated by::Alan Gustafson]] [[Category:ENS Notification]]",
    "query_source": "SMWSQLStore",
    "query_time": "0.0089",
    "from_cache": false
}

	Entered date	Event description
ENS 46708	30 March 2011 01:39:00	The design of the Auxiliary Feedwater (AF) system is for the AF pumps to normally take suction from the condensate storage tank. If the condensate storage tank is not available, the essential service water system provides the alternate supply. Due to the AF system suction piping and valve configuration, a voided section of pipe could exist in the portion that isolates the condensate storage tank supply from the essential service water supply. A preliminary vendor analysis has determined that the void fraction to reach the pump in a dynamic scenario exceeds the acceptance criteria for AF pump operability. Based on past operation in this configuration, the event is being reported as a unanalyzed condition that significantly degrades plant safety and a condition that could have prevented the fulfillment of a safety function (i.e., remove residual heat) under 10CFR50.72(b)(3)(ii) and 10CFR50.72(b)(3)(v). Further review of the void model and pump performance characteristics are planned. In 2011, prior to the completion of this analysis. The void was refilled and verified full for both trains at Byron U1 and U2. Unit 1 is defueled. This condition affects both 'A' and 'B' trains of auxiliary feedwater for both Unit 1 and Unit 2. The NRC Resident Inspector has been notified.

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