ENS 45302

From kanterella

Jump to navigation Jump to search

v t e ENS Event
02:40 Aug 26, 2009
Title	Autoclave Pressure Relief System Inoperable
Event Description	On 08-25-09, the Plant Shift Superintendent (PSS) was notified that C-360 (Toll Transfer & Sampling Building) Autoclave #4 had a failure in the autoclave pressure relief system. The autoclave pressure relief system utilizes a rupture disc in series with a relief valve. A pressure indicator is located between the rupture disc and the relief valve to verify that the pressure between the two devices is less than 5 psig per TSR 2.1.3.2 Condition A. This pressure is limited to prevent any significant bias to the actuation pressure of the rupture disc. TSR 2.1.3.2 requires that the actuation pressure of the autoclave pressure relief system shall not exceed 157.5 psig. On 08-25-09 at 2140 CDT, an operator was preparing to place the #4 autoclave into service, per the proper operating procedure, when the pressure between the rupture disc and the relief valve was found to be 5.5 psig, a pressure which indicated a failure in this required safety system. The autoclave was in a mode where this TSR system is required to be operable. There is low safety significance to this failure as the TSR does allow the current operating cycle to be completed under this condition. Since the operating cycle was just started and steam had not been applied to the autoclave, the operating evolution was abandoned and the autoclave was declared inoperable and taken out of service. 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 Resident Inspector has been notified of this event. PGDP Assessment and Tracking Report No. ATRC-09-2084; PGDP Event Report No. PAD-2009-12; Worksheet No. Responsible Division: Operations

ENS 45302 +/-
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:+13.65 h0.569 days <br />0.0812 weeks <br />0.0187 months <br />)
Opened:	Billy Wallace 16:19 Aug 26, 2009
NRC Officer:	Mark Abramovitz
Last Updated:	Aug 26, 2009
45302 - 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]

Retrieved from "https://kanterella.com/w/index.php?title=ENS_45302&oldid=1183857"

ENS Notification