ENS 40438

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v t e ENS Event
00:00 Jan 12, 2004
Title	Safety Equipment Fails to Function
Event Description	At 1810 [CST] on 01-11-04 the Plant Shift Superintendent (PSS) was notified of a failure of the C-360 #4 Autoclave High Pressure Isolation System. Water was observed leaking from the autoclave head-to-shell interface near the six o'clock position shortly after initiating a cylinder heat cycle. At the time of discovery, the autoclave was in TSR mode 5 and the High Pressure Isolation System was required to be operable while in this mode. This system is designed to provide containment of the autoclave and prevent an external release of UF6 during a system breach while heating a UF6 cylinder. The PSS declared the system inoperable and TSR LCO 2.1.3.1 .C1 actions were implemented to remove the autoclave from service and place it in Mode 2, 'Out of Service.' 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 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 preestablished safe condition after an accident. The equipment was required by TSR to be available and operable and no redundant equipment was available to perform the required safety function. PGDP Problem Report No. ATR-04-0095; PGDP Event Report No. PAD-2004-02; Event Worksheet Responsible Division; Operations Operations has notified the Senior NRC Resident Inspector. * * UPDATE ON 1/16/04 AT 1536 EST FROM KEVIN BEASLEY TO GERRY WAIG * * * This event has been retracted and the following update information provided: Subsequent to the report, plant engineers inspected the autoclave sealing surfaces and O-ring. The O-ring and autoclave sealing surfaces were found to be in good condition with no problems noted that would cause the water leak observed by the operators. The autoclave was subjected to a head-to-shell alignment (pinch) test. The test determined that the autoclave sealing surfaces were within acceptable alignment tolerances and no adjustments were made. To determine the autoclave's ability to perform its containment function, the TSR surveillance (pressure decay test) was performed with the autoclave In the as-found condition, i.e., without any maintenance or changes in the autoclave condition. The autoclave passed this test with approximately half the maximum allowable leak rate. The successful performance of the autoclave pressure decay test indicates that the autoclave HPIS [High Pressure Isolation System] would have been able to perform its designed containment function on January 11, 2004, had it been necessary. Thus, the 10CFR76.120 reporting criteria were not met. The NRC Resident Inspector has been notified of this retraction. PGDP Problem Report No. ATR-04-0095; PGDP Event Report No. PAP-2004-02; Event Worksheet 40438 Responsible Division: Operations Notified R2DO (Robert Haag), NMSS (Tom Essig), DIRO (Richard Wessman).

ENS 40438 +/-
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:+14.28 h0.595 days <br />0.085 weeks <br />0.0196 months <br />)
Opened:	Calvin Pittman 14:17 Jan 12, 2004
NRC Officer:	Jeff Rotton
Last Updated:	Jan 16, 2004
40438 - 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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