ENS 43549
ENS Event | |
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14:25 Aug 4, 2007 | |
Title | X-342 Facility Containment Shutdown |
Event Description | On Saturday August 4th 2007 at 1025 hours0.0119 days <br />0.285 hours <br />0.00169 weeks <br />3.900125e-4 months <br />, Autoclave # 1 in the X-342 Facility experienced a Containment Shutdown due to the actuation of both 'A' and 'B' EXTREME PRESSURE AUTOCLAVE alarms. The autoclave was in (applicable) TSR MODE II 'Heating' for 55 minutes when these actuations occurred. After reviewing the other autoclave operating parameters and the results of the as-found pressure loop values, it is evident that there was no release of UF6 inside this autoclave. Operations and Engineering Personnel are continuing their investigation into the circumstances surrounding this event in an attempt to identify the cause of the alarm actuations. With no evidence to suggest these alarms were caused by an invalid signal, the Plant Shift Superintendent's (PSS) Office is reporting this event as a valid actuation of a 'Q' Safety System.
The autoclave was placed in MODE VII 'Shutdown' and declared inoperable by the Plant Shift Superintendent (PSS). No release of radioactive material occurred as a result of the incident. This event is being reported in accordance with UE2-RA-RE1030 Appendix D. J. 2. Safety Equipment Actuations. The licensee notified the Department of Energy and the NRC Resident Inspector.
Following a comprehensive review of the circumstances surrounding this incident by the PORTS Nuclear Regulatory Affairs (NRA) Group, a recommendation was made to the PSS Office that this event be retracted. This recommendation was based upon the determination that the 'Q' Safety function of the 'A' and 'B' EXTREME PRESSURE AUTOCLAVE alarms is to actuate when the internal autoclave shell pressure rises above the operating steam pressure (thereby indicating a UF6 release within the autoclave and placing the autoclave in containment. Since there was no UF6 release and the autoclave internal pressure was only due to steam, there was no valid signal to the 'Q' Autoclave Shell High Pressure Containment Shutdown System. Per the reporting criteria stated in PORTS SAR section 6.9, Table 1, criteria J.2, this is not a reportable event due to the 'Q' system actuation being caused by an invalid signal. Based upon the information provided, the PORTS PSS Office is retracting this event. The licensee notified the NRC Resident Inspector. The licensee will be notifying the Department of Energy. Notified R2DO (Ogle) and FSME EO ( Flannery). |
Where | |
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Portsmouth Gaseous Diffusion Plant Piketon, Ohio (NRC Region 2) | |
License number: | GDP-2 |
Reporting | |
Other Unspec Reqmnt | |
Time - Person (Reporting Time:+19.13 h0.797 days <br />0.114 weeks <br />0.0262 months <br />) | |
Opened: | Ron Crabtree 09:33 Aug 5, 2007 |
NRC Officer: | Pete Snyder |
Last Updated: | Aug 14, 2007 |
43549 - NRC Website
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Portsmouth Gaseous Diffusion Plant with Other Unspec Reqmnt | |
WEEKMONTHYEARENS 459252010-05-13T20:02:00013 May 2010 20:02:00
[Table view]Other Unspec Reqmnt Notification of Ohio Environmental Protection Agency Due to Exceeding Npdes Discharge Permit Value ENS 459172010-05-11T21:09:00011 May 2010 21:09:00 Other Unspec Reqmnt Offsite Notification ENS 457522010-03-08T05:00:0008 March 2010 05:00:00 Other Unspec Reqmnt Potential Release of Contaminated Materals Off-Site ENS 451882009-07-07T04:54:0007 July 2009 04:54:00 Other Unspec Reqmnt 4-Hour Report Due to Notification of Ohio Epa Because of Boiler Opacity Limit Being Exceeded ENS 437832007-11-14T13:30:00014 November 2007 13:30:00 Other Unspec Reqmnt 24-Hr Incident Report - Safety System Actuation ENS 436712007-09-28T15:16:00028 September 2007 15:16:00 Other Unspec Reqmnt Smoke from Steam Plant Startup Requiring State Notification ENS 435782007-08-18T06:10:00018 August 2007 06:10:00 Other Unspec Reqmnt Feed Facility Autoclave O-Ring Failure ENS 435492007-08-04T14:25:0004 August 2007 14:25:00 Other Unspec Reqmnt X-342 Facility Containment Shutdown ENS 421702005-11-26T02:20:00026 November 2005 02:20:00 Other Unspec Reqmnt Oil Spill on Plant Site ENS 416232005-04-22T01:13:00022 April 2005 01:13:00 Other Unspec Reqmnt Autoclave Shutdown Due to High Condensate ENS 413912005-02-09T17:03:0009 February 2005 17:03:00 Other Unspec Reqmnt Offsite Notification Due to Reportable Quantity Spill Contained on Site ENS 406762004-04-15T14:30:00015 April 2004 14:30:00 Other Unspec Reqmnt Hazardous Material Spill ENS 405992004-03-19T14:10:00019 March 2004 14:10:00 Other Unspec Reqmnt Safety System Actuation at Portsmouth Gdp ENS 401242003-09-02T01:45:0002 September 2003 01:45:00 Other Unspec Reqmnt Manual Actuation of Safety Equipment for Autoclave Containment 2010-05-13T20:02:00 | |