ENS 43708

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v t e ENS Event
22:00 Oct 9, 2007
Title	Safety System Valve Did Not Operate as Expected
Event Description	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 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 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. The NRC Resident Inspector has been notified of this event. PGDP Assessment and Tracking Report No. ATR-07-2675; PGDP Event Report No. PAD-2007-16

ENS 43708 +/-
Where
Paducah Gaseous Diffusion Plant Paducah, Kentucky (NRC Region 2)
License number:	GDP-1
Reporting

10 CFR 76.120(c)(2)
Time - Person (Reporting Time:+18.27 h0.761 days <br />0.109 weeks <br />0.025 months <br />)
Opened:	Mike Underwood 16:16 Oct 10, 2007
NRC Officer:	Mark Abramovitz
Last Updated:	Oct 10, 2007
43708 - NRC Website
v • d • e

v t e Emergency Notification System
Paducah Gaseous Diffusion Plant with 10 CFR 76.120(c)(2)
WEEKMONTHYEAR2014-05-08T15:24:00 [Table view]
[ENS list for Paducah Gaseous Diffusion Plant]

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