ENS 42973

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v t e ENS Event
22:07 Nov 7, 2006
Title	Failure of Process Gas Leak Detection System
Event Description	At 1607 on 11/7/2006, the Plant Shift Superintendent (PSS) was notified of a failure of the C-333 Unit 6 Cell 3 process gas leak detection (PGLD) system. C-333 operators were alerted to the Unit 6 Cell 3 PGLD failure by the receipt of an Area Control Room alarm. The operators responded to the Unit 6 Cell 3 cell panel and discovered that the PGLD system was inoperable. C-333 Unit 6 Cell 3 and associated piping were operating above atmospheric pressure (Cascade Mode 2) at the time of the PGLD failure. The operators initiated a continuous smoke watch of the area with lost PGLD coverage until the associated equipment and piping pressure was reduced below atmospheric pressure in accordance with TSR LCO 2.4.4.1. The PGLD system is required per TSR 2.4.4.1 to be operable when a cascade cell and associated piping is above atmospheric pressure (Cascade Mode 2). 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 Inspector has been notified of this event. PGDP Problem Report No. ATRC-06-3679; PGDP Event Report No. PAD-2006-11; NRC Worksheet No. 42973. The licensee stated that the equipment and piping pressure was reduced in order to allow the process to continue operating in a condition where the PGLD system is not required to be operable. The licensee is investigating the cause of the failure but it is preliminarily believed to be a failure of an instrumentation power supply.

ENS 42973 +/-
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:+12.82 h0.534 days <br />0.0763 weeks <br />0.0176 months <br />)
Opened:	Matt Maurer 10:56 Nov 8, 2006
NRC Officer:	Mike Ripley
Last Updated:	Nov 8, 2006
42973 - 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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