ENS 43686

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v t e ENS Event
19:06 Oct 2, 2007
Title	Release Detection System (Pgld) Declared Inoperable
Event Description	At 1406 CDST, on 10-02-07 the Plant Shift Superintendent (PSS) was notified that an alarm was received for the C-333, Unit 6, Cell 4, UF6 Release Detection (PGLD) System. Operators responded and found that the READY and MANUAL lights for this system were not illuminated. This PGLD System contains detectors that cover C-333, Unit 6, Cell 4, and Section 2 of the cell bypass piping. At the time of this alarm, some areas of Section 2 of the cell bypass were operating above atmospheric pressure. TSR 2.4.4.1 requires that at least the minimum number of detector heads in each defined section of the cell bypass are operable during steady state operations above atmospheric pressure. With the Unit 6, Cell 4, PGLD System inoperable, only 2 of the required 3 heads in Section 2 of the cell bypass were operable. This PGLD System was declared inoperable, TSR LCO 2.4.4.1 .C.1 was entered and a continuous smoke watch was put in place within one hour. An investigation is ongoing and at this point a wire was found that had failed with visible insulation damage. Engineering has determined that the system would not have been able to perform its intended safety function when this alarm came in. 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 76.1 20(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. This event is similar to EN#43670 on 09/27/07. The NRC Senior Resident Inspector has been notified of this event.

ENS 43686 +/-
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:+19.48 h0.812 days <br />0.116 weeks <br />0.0267 months <br />)
Opened:	M.C. Pitman 14:35 Oct 3, 2007
NRC Officer:	John Knoke
Last Updated:	Oct 3, 2007
43686 - 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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