ENS 45527

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v t e ENS Event
00:50 Nov 29, 2009
Title	Safety Equipment Disabled Due to a Ground in the Area Control Room Alarm
Event Description	At 1850 CST, on 11/28/09 the Plant Shift Superintendent (PSS) was notified that the C-333 Unit 6 Cell 5 UF6 Release Detection (PGLD) System was inoperable due to loss of power to the Area Control Room (ACR) alarm for this system. The purpose of the PGLD System is to detect a UF6 release and alert operators in the ACR by sounding an alarm. At the time this was discovered, G-333 Unit 6 Cell 5 was operating above atmospheric pressure. 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. With the Unit 6 Cell 5 PGLD system inoperable, none of the required heads were operable. This PGLD System was declared inoperable, TSR LCO 2.4.4.1.B.1 was entered and a continuous smoke watch was put in place within one hour. Troubleshooting was initiated, a ground was discovered on the alarm circuit, the ground was isolated, and the system was tested and declared operable at 2305 [CST]. 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 Resident Inspector has been notified of this event.

ENS 45527 +/-
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:+12.18 h0.508 days <br />0.0725 weeks <br />0.0167 months <br />)
Opened:	Calvin Pittman 13:01 Nov 29, 2009
NRC Officer:	Dong Park
Last Updated:	Nov 29, 2009
45527 - 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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