ENS 42590

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v t e ENS Event
12:15 May 20, 2006
Title	High Pressure Transmitter Failure
Event Description	At 0715 CDT on 05120/06, the Plant Shift Superintendent (PSS) was notified of a failure of the C-333A Autoclave 2 North High Cylinder Pressure System (HCPS). During a normal cylinder heating cycle the operator noted that the cylinder pressure, as read on a local digital pressure Indicator and on a digital recorder in the Operations Monitoring Room (OMR), unexpectedly fell from 55 psia to a negative value on both instruments. A 14 ton cylinder containing [deleted] U235 assay uranium hexafluoride had been heating (TSR Mode 5) for approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when the failure occurred. The PSS declared the HCPS inoperable and TSR LCO 2.2.4.14B actions were implemented to place the autoclave in Mode 2, 'Autoclave Open and Out-of-Service'. The HCPS is a TSR system designed to minimize the potential of primary system integrity failure (cylinder rupture) during a pressure increase event by tripping the steam supply to the autoclave prior to reaching the Maximum Allowable Working Pressure (MAWP) of the cylinder. 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. Work Request #5087574" submitted to troubleshoot and repair. PGDP Problem Report No. ATRC-06-1655; PGDP Event Report No. PAD-2006-06; NRC Worksheet No. 42,590 The NRC Senior Resident Inspector has been notified of this event.

ENS 42590 +/-
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:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />)
Opened:	Steve Skaggs 11:51 May 20, 2006
NRC Officer:	John Mackinnon
Last Updated:	May 20, 2006
42590 - 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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