ENS 44820

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v t e ENS Event
07:50 Jan 31, 2009
Title	Loss of Power to Criticality Accident Alarm System Horn
Event Description	At 0150 CST, on 01-31-09 the Plant Shift Superintendent (PSS) was notified that a Criticality Accident Alarm System (CAAS) trouble alarm had actuated for the C-409 (Stabilization Building). The PSS dispatched personnel to investigate and discovered that a circuit breaker had tripped causing a loss of power to the CAAS horn uninterruptible power supply (UPS). Further investigation revealed that the output of the UPS was off. This caused loss of CAAS audibility for C-409 and TSR LCO 2.6.4.1b was immediately entered. There were no fissile material operations in progress and all personnel in the affected area had a radio in constant communication with the Central Communications Facility satisfying the required actions of TSR 2.6.4.1 b. The circuit breaker that tripped was closed, the UPS was turned back on, and TSR 2.6.4.1b was exited at 0317 hours0.00367 days <br />0.0881 hours <br />5.241402e-4 weeks <br />1.206185e-4 months <br />. 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 Assessment and Tracking Report No. ATR-09-0203; PGDP Event Report No. PAD-2009-02

ENS 44820 +/-
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:+5.53 h0.23 days <br />0.0329 weeks <br />0.00757 months <br />)
Opened:	Calvin Pittman 13:22 Jan 31, 2009
NRC Officer:	John Knoke
Last Updated:	Jan 31, 2009
44820 - 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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