ENS 42866

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v t e ENS Event
23:02 Sep 28, 2006
Title	Failure of Autoclave High Cylinder Pressure System
Event Description	At 1802 CDT on 09/28/06, the Plant Shift-Superintendent (PSS) was notified of a failure of the C-333A Autoclave 3 South 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 a steady 65 psia to a negative value on both instruments. A 14 ton cylinder containing 0.4019% U235 assay uranium hexafluoride had been heating (TSR Mode 5) for approximately 2.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 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. There was no release of radioactive material. The licensee notified the NRC Resident Inspector.

ENS 42866 +/-
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:+15.65 h0.652 days <br />0.0932 weeks <br />0.0214 months <br />)
Opened:	Billy Wallace 14:41 Sep 29, 2006
NRC Officer:	Mark Abramovitz
Last Updated:	Sep 29, 2006
42866 - 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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