ENS 47376

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v t e ENS Event
18:20 Oct 26, 2011
Title	24 Hour Report Due to Detection of Linear Defect in Surge Volume Accumulator
Event Description	At 1320 CDT, on 10-26-11 the Plant Shift Superintendent (PSS) was notified that the C-310 Side Accumulator had a linear defect in the vessel shell that caused a UF6 release on 10-21-2011. The UF6 liquid accumulators serve the product withdrawal system. The side accumulator is a monel tank used in the product withdrawal system to provide a surge volume. The safety function of the side accumulator is to provide UF6 primary system integrity for the withdrawal process that contains a gaseous and liquid UF6. TSR 2.3.5.6 is a design feature that requires the withdrawal area UF6 condensers and accumulator vessels to have a minimum required metal thickness in accordance with ASME requirements to prevent UF6 releases. There are no LCO actions associated with this TSR but there is a 5 year surveillance requirement to perform a visual inspection including thickness measurements. The side accumulator was in service when a small UF6 release occurred on 10-21-2011. The release was contained to the immediate area and the side accumulator was taken out of service for investigation and subsequent repairs. 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 10CFR 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 Senior Resident has been notified of this event. PGDP Assessment and Tracking Report No. ATR-11-2856; PDGP Event Report No. PAD-2011-19.

ENS 47376 +/-
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:+3.07 h0.128 days <br />0.0183 weeks <br />0.00421 months <br />)
Opened:	Joe Barletto 21:24 Oct 26, 2011
NRC Officer:	Steve Sandin
Last Updated:	Oct 26, 2011
47376 - 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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