ENS 43312

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v t e ENS Event
08:20 Apr 22, 2007
Title	Uf6 Release Detection System Inoperable
Event Description	At 0320 CDST, on 4-22-07 the Plant Shift Superintendent (PSS) was notified that the control power for C-337A #1 Autoclave had been lost due to a blown control power fuse. Investigation of a problem with the Autoclave 1 West CV-510 valve close indicating light not functioning properly was in progress at the time the fuse blew. Maintenance personnel were performing non-intrusive checks of the valve's limit switch and had activated the limit switch operating plunger when the fuse blew. No maintenance work package was used for these checks. The power supply for the local autoclave area audible and visible alarms for the UF6 Release Detection System are fed from the #1 Autoclave control power. Due to this loss of control power, the UF6 Release Detection System was rendered inoperable. At the time of the incident, the C-337A facility was operating in an operational mode in which the UF6 Release Detection System was required to be operable, TSR 2.2.4.1 Mode 5. The C-337A Operations Monitoring Room where UF6 Release Detection System alarms would have been received was unoccupied at the time of the fuse failure due to C-337A personnel in the autoclave area assisting with the CV-510 light investigation. The system was declared inoperable and Limiting Conditions of Operation (LCO) required action, TSR 2.2.4.1 A.1, was put in place until power could be restored. Subsequent troubleshooting revealed the CV-510 limit switch was broken and has shorted the control circuit to ground when activated causing the fuse to blow. Power was restored and the UF6 Release Detection System was declared operable at 0539 on 4-22-07 following repairs and PMT. The 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 as required by 10 CFR 76.120(c)(2)(i); An event in which equipment is disabled or fails to function as designed when the equipment is required by TSR to be available and operable and no redundant equipment was available to perform the required safety function. The NRC Senior Resident Inspector has been notified of this event.

ENS 43312 +/-
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:+5.55 h0.231 days <br />0.033 weeks <br />0.0076 months <br />)
Opened:	Wf Cage 13:53 Apr 22, 2007
NRC Officer:	Jason Kozal
Last Updated:	Apr 22, 2007
43312 - 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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