ENS 43987

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v t e ENS Event
08:07 Feb 14, 2008
Title	Alarm Received from Uf6 Release Detection System
Event Description	At 0207 CST, on 02-14-08 the Plant Shift Superintendent (PSS) was notified that an alarm was received in the C-333 Area Control Room for the C-333 Unit 5 Cell 8 UF6 Release Detection (PGLD) System. Operators responded to the local panel and verified the alarm was not due to a UF6 release, but local panel lights were flickering. Operators attempted to test the system and the system would not test fire. This PGLD System contains detectors that cover the C-333 Unit 5 Cell 8 cell housing roof and inter-cell housing and section 4 of the cell bypass housing. At the time of this alarm, C-333 Unit 5 Cell 8 and section 4 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 the cell housing roof, inter-cell housing, and section 4 of the cell bypass housing are operable during steady state operations above atmospheric pressure. With the Unit 5 Cell 8 PGLD System inoperable, none of the required 3 heads in the cell housing roof and inter-cell housing were operable and only two of the required 3 heads in the cell bypass housing were operable. This PGLD System was declared inoperable. TSR LCOs 2.4.4.1.B.1 and 2.4.4.1 .C.1 were entered and a continuous smoke watch was put in place within one hour. An investigation is ongoing to attempt to determine the cause of the failure. This event is being reported 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.

ENS 43987 +/-
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:+6.05 h0.252 days <br />0.036 weeks <br />0.00829 months <br />)
Opened:	Tony Hudson 14:10 Feb 14, 2008
NRC Officer:	John Knoke
Last Updated:	Feb 14, 2008
43987 - 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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