ENS 44742

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v t e ENS Event
02:43 Dec 27, 2008
Title	Process Gas Leak Detection System Inoperable
Event Description	At 2043 CST, on 12-26-08 the Plant Shift Superintendent (PSS) was notified that C-337 Unit 6 Cell 9 was above atmospheric pressure and the UF6 Release Detection (PGLD) System was inoperable. The cell had been running below atmosphere earlier in the day but a new gradient was put in and load movement caused pressure to go above atmosphere. The PGLD System for Unit 6 Cell 9 had been inoperable for an extended period of time due to wiring problems. TSR 2.4.4.1 requires that at least the minimum number of detector heads in the cell are operable during steady state operations above atmospheric pressure. Even though the increase in cell pressure was due to load movement which is transient in nature, it was determined that the pressure had been above atmosphere for about four and a half hours, which is longer than the typical transient. With the Unit 6 Cell 9 PGLD system inoperable, none of the required cell heads were operable. TSR LCO 2.4.4.1.B.1 was entered and a continuous smoke watch was put in place within one hour. 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 10CFR76.120(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. * * RETRACTION ON 12/31/2008 AT 1716 FROM TONY HUDSON TO MARK ABRAMOVITZ * * * A subsequent review of the cell pressure proved that the cell pressures were below atmosphere at all times with the exception of one pressure spike of approximately 20 minutes. Since the cell was not operated above atmosphere and the TSR does not require PGLD systems to be operable during short term pressure transients, reporting under 10CFR76.120 is not required. Notified the R2DO (Lesser) and NMSS (Lorson).

ENS 44742 +/- *RETRACTED*
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:+11.6 h0.483 days <br />0.069 weeks <br />0.0159 months <br />)
Opened:	Kevin Beasley 14:19 Dec 27, 2008
NRC Officer:	Vince Klco
Last Updated:	Dec 31, 2008
44742 - 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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