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At 1700 CDT, on 10-09-07 the Plant Shift S … At 1700 CDT, on 10-09-07 the Plant Shift Superintendent (PSS) was notified that the C-333 Unit 4 Cell 3 freezer/sublimer computer indicated that the 'B' valve failed to unknown status. Investigation by an operator determined that the 'B' valve would not operate electrically and was in the open position. The freezer/sublimer automatically transitioned to the Hot Standby Mode (FS4) and the electrically failed 'B' valve was closed manually by an operator. The freezer/sublimer was being operated in mode FS1, the freeze mode, at the time of the failure. TSR 2.4.3.1 requires the high-high weight trip system and its associated 'B' valve to be operable in mode FS1. It was determined that the system would not have been able to perform its intended safety function with the 'B' valve disabled. This event is reportable as a 24 hour event in accordance with 10 CFR 76.120(c)(2)(i). This is an event in which equipment is disabled or fails to function as designed when: a.) the equipment is required by a TSR to prevent releases, prevent exposures to radiation and radioactive materials exceeding specified limits, mitigate the consequences of an accident, or restore this facility to a pre-established safe condition after an accident; b.) the equipment is required by a TSR to be available and operable and either should have been operating or should have operated on demand, and c.) no redundant equipment is available and operable to perform the required safety function.</br>The NRC Resident Inspector has been notified of this event.</br>PGDP Assessment and Tracking Report No. ATR-07-2675; PGDP Event Report No. PAD-2007-1607-2675; PGDP Event Report No. PAD-2007-16 +
22:00:00, 9 October 2007 +
43,708 +
16:16:00, 10 October 2007 +
22:00:00, 9 October 2007 +
At 1700 CDT, on 10-09-07 the Plant Shift S … At 1700 CDT, on 10-09-07 the Plant Shift Superintendent (PSS) was notified that the C-333 Unit 4 Cell 3 freezer/sublimer computer indicated that the 'B' valve failed to unknown status. Investigation by an operator determined that the 'B' valve would not operate electrically and was in the open position. The freezer/sublimer automatically transitioned to the Hot Standby Mode (FS4) and the electrically failed 'B' valve was closed manually by an operator. The freezer/sublimer was being operated in mode FS1, the freeze mode, at the time of the failure. TSR 2.4.3.1 requires the high-high weight trip system and its associated 'B' valve to be operable in mode FS1. It was determined that the system would not have been able to perform its intended safety function with the 'B' valve disabled. This event is reportable as a 24 hour event in accordance with 10 CFR 76.120(c)(2)(i). This is an event in which equipment is disabled or fails to function as designed when: a.) the equipment is required by a TSR to prevent releases, prevent exposures to radiation and radioactive materials exceeding specified limits, mitigate the consequences of an accident, or restore this facility to a pre-established safe condition after an accident; b.) the equipment is required by a TSR to be available and operable and either should have been operating or should have operated on demand, and c.) no redundant equipment is available and operable to perform the required safety function.</br>The NRC Resident Inspector has been notified of this event.</br>PGDP Assessment and Tracking Report No. ATR-07-2675; PGDP Event Report No. PAD-2007-1607-2675; PGDP Event Report No. PAD-2007-16 +
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00:00:00, 10 October 2007 +
GDP-1 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
23:31:22, 24 November 2018 +
16:16:00, 10 October 2007 +
0.761 d (18.27 hours, 0.109 weeks, 0.025 months) +
22:00:00, 9 October 2007 +
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