ENS 42494: Difference between revisions
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| facility = Paducah Gaseous Diffusion Plant | | facility = Paducah Gaseous Diffusion Plant | ||
| Organization = | | Organization = | ||
| license number = | | license number = GDP-1 | ||
| region = 2 | | region = 2 | ||
| state = Kentucky | | state = Kentucky | ||
Latest revision as of 19:35, 24 November 2018
ENS Event | |
|---|---|
13:13 Apr 12, 2006 | |
| Title | Uf6 Release Detection System Failed During Testing |
| Event Description | At 0813 CDT on 04/12/2006, the Plant Shift Superintendent (PSS) was notified that immediately following routine test firing of the C-333 Unit 4 cell 7 UF6 Release Detection System (TSR surveillance requirement 2.4.4.1-1), smoke and sparks were observed coming from the UF6 Release Detection System control module and the system ready light was extinguished. The Area Control Room alarm locked in and the system was declared inoperable by the PSS. The cell and associated piping were above atmospheric pressure (Cascade Mode 2) at the time of the failure.
The UF6 Release Detection System is a TSR system that is required to be operable per TSR 2.4.4.1, when a cascade cell and associated piping are in Cascade Mode 2. After discovery of failed system condition, a continuous UF6 smoke watch was initiated on the areas affected by the loss of detection capability in accordance with LCO Required Actions 2.4.4.1.B.1 and 2.4.4.C.1. 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 Senior Resident Inspector has been notified of this event. PGDP Problem Report No. ATRC-06-1197; PGDP Event Report No. PAD-2006-03. There was no release from this event. The failure was shorted contacts in the alarm reset relay.
This report is being retracted. Subsequent to the event, Maintenance and System Engineering determined that the alarm disable switch control module faulted when the operator attempted to reset the ACR PGLD alarm. This fault caused the system power supply to fail. Resetting the alarms is the last step in the test procedure being performed when the failure occurred. Only after the alarms are cleared is the PGLD system returned to normal operating condition and testing complete. In this case, the evidence clearly indicated that the failure occurred during the conduct of the surveillance and the successful firing of the detectors and the start of the test provides positive evidence that the failure did not exist prior to the surveillance. Therefore, the in-service safety system failure reporting criteria of 10CFR 76.120(c)(2)(i) is not applicable. The Senior Resident Inspector has been notified of this retraction. Notified R2DO(Lesser) and NMSS (Janosko). |
| 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:+4.28 h0.178 days <br />0.0255 weeks <br />0.00586 months <br />) | |
| Opened: | Eric Walker 17:30 Apr 12, 2006 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Apr 18, 2006 |
| 42494 - NRC Website | |
Paducah Gaseous Diffusion Plant with 10 CFR 76.120(c)(2) | |
WEEKMONTHYEARENS 500992014-05-08T15:24:0008 May 2014 15:24:00
[Table view]10 CFR 76.120(c)(2) High Pressure Fire Water Sprinkler System B-6 Declared Inoperable ENS 499532014-03-24T01:50:00024 March 2014 01:50:00 10 CFR 76.120(c)(2) Safety Equipment Potential Failure - High Pressure Fire Water Sprinkler System ENS 499182014-03-14T18:30:00014 March 2014 18:30:00 10 CFR 76.120(c)(2) High Pressure Fire Water Systems Declared Inoperable ENS 485222012-11-19T22:25:00019 November 2012 22:25:00 10 CFR 76.120(c)(2) Uninterruptible Power Supply Safety Equipment Failure ENS 480222012-06-12T20:45:00012 June 2012 20:45:00 10 CFR 76.120(c)(2) Safety Equipment Failure - Criticality Air Horns Not Tested for Audibility ENS 479112012-05-08T21:16:0008 May 2012 21:16:00 10 CFR 76.120(c)(2), Response Autoclave High Pressure Isolation System Failure ENS 475312011-12-17T06:01:00017 December 2011 06:01:00 10 CFR 76.120(c)(2) Possible Degradation in High Pressure Fire Water Sprinkler Heads ENS 473762011-10-26T18:20:00026 October 2011 18:20:00 10 CFR 76.120(c)(2) 24 Hour Report Due to Detection of Linear Defect in Surge Volume Accumulator ENS 469962011-06-28T05:05:00028 June 2011 05:05:00 10 CFR 76.120(c)(2) Failure of #2 Fire Water Pump to Realign ENS 468532011-05-15T17:54:00015 May 2011 17:54:00 10 CFR 76.120(c)(2) Portion of High Pressure Fire Water System Declared Inoperable ENS 458902010-04-30T15:15:00030 April 2010 15:15:00 10 CFR 76.120(c)(2) Tar Found on Overpressure Rupture Discs Potentially Changing the Relief Set Point ENS 458002010-03-29T13:08:00029 March 2010 13:08:00 10 CFR 76.120(c)(2) Safety Equipment Failure - Process Gas Detection System Found Inoperable ENS 456292010-01-13T14:50:00013 January 2010 14:50:00 10 CFR 76.120(c)(2) Process Gas Leak Detection System Inoperable ENS 455272009-11-29T00:50:00029 November 2009 00:50:00 10 CFR 76.120(c)(2) Safety Equipment Disabled Due to a Ground in the Area Control Room Alarm ENS 453652009-09-19T18:23:00019 September 2009 18:23:00 10 CFR 76.120(c)(2) High Voltage Process Gas Leak Detector Rendered Inoperable ENS 453022009-08-26T02:40:00026 August 2009 02:40:00 10 CFR 76.120(c)(2) Autoclave Pressure Relief System Inoperable ENS 448202009-01-31T07:50:00031 January 2009 07:50:00 10 CFR 76.120(c)(2) Loss of Power to Criticality Accident Alarm System Horn ENS 448192009-01-30T18:17:00030 January 2009 18:17:00 10 CFR 76.120(c)(2) 24 Hour Report of Process Gas Leak Detection System Inoperability ENS 447422008-12-27T02:43:00027 December 2008 02:43:00 10 CFR 76.120(c)(2) Process Gas Leak Detection System Inoperable ENS 447052008-12-08T08:19:0008 December 2008 08:19:00 10 CFR 76.120(c)(2) Process Gas Leak Detection System Inoperable ENS 446642008-11-18T09:08:00018 November 2008 09:08:00 10 CFR 76.120(c)(2) Fire Water Sprinkler System Out of Service ENS 446212008-11-01T13:37:0001 November 2008 13:37:00 10 CFR 76.120(c)(2) Process Gas Leak Detection System Not Functioning Correctly ENS 446082008-10-28T13:49:00028 October 2008 13:49:00 10 CFR 76.120(c)(2) Process Gas Leak Detection System Inoperable ENS 445152008-09-23T14:37:00023 September 2008 14:37:00 10 CFR 76.120(c)(2) Safety Equipment Failure Due to Loss of Power ENS 444482008-08-28T16:43:00028 August 2008 16:43:00 10 CFR 76.120(c)(2), Other Unspec Reqmnt Leak in High Pressure Fire Water System ENS 443562008-07-20T17:20:00020 July 2008 17:20:00 10 CFR 76.120(c)(2) Failure of Process Gas Leak Detection System ENS 442022008-05-12T17:30:00012 May 2008 17:30:00 10 CFR 76.120(c)(2) 24-Hr Report - Uf6 Release Detection System Failure ENS 441582008-04-22T14:00:00022 April 2008 14:00:00 10 CFR 76.120(c)(2) Improperly Installed Steel Angle Supports on Freezer Sublimer Vessel ENS 441342008-04-11T00:03:00011 April 2008 00:03:00 10 CFR 76.120(c)(2) Failed Detector Heads ENS 439872008-02-14T08:07:00014 February 2008 08:07:00 10 CFR 76.120(c)(2) Alarm Received from Uf6 Release Detection System ENS 439532008-01-31T20:06:00031 January 2008 20:06:00 10 CFR 76.120(c)(2) 24 Hour Report of Release Detection System Failure ENS 439032008-01-13T21:12:00013 January 2008 21:12:00 10 CFR 76.120(c)(2) Failure of Uf6 Release Detection System ENS 438012007-11-21T02:28:00021 November 2007 02:28:00 10 CFR 76.120(c)(2) Failure of Uf6 Release Detection System ENS 437082007-10-09T22:00:0009 October 2007 22:00:00 10 CFR 76.120(c)(2) Safety System Valve Did Not Operate as Expected ENS 436962007-10-05T21:43:0005 October 2007 21:43:00 10 CFR 76.120(c)(2) Process Gas Leak Detection (Pgld) System Inoperable ENS 436862007-10-02T19:06:0002 October 2007 19:06:00 10 CFR 76.120(c)(2) Release Detection System (Pgld) Declared Inoperable ENS 436702007-09-27T05:12:00027 September 2007 05:12:00 10 CFR 76.120(c)(2) Temporary Loss of Smoke Detector Function ENS 433122007-04-22T08:20:00022 April 2007 08:20:00 10 CFR 76.120(c)(2) Uf6 Release Detection System Inoperable ENS 433052007-04-17T00:15:00017 April 2007 00:15:00 10 CFR 76.120(c)(2) Large Water Leak on High Pressure Fire Water System ENS 432682007-03-30T15:30:00030 March 2007 15:30:00 10 CFR 76.120(c)(2) Safety Equipment Failure - Process Gas Leak Detection System ENS 429732006-11-07T22:07:0007 November 2006 22:07:00 10 CFR 76.120(c)(2) Failure of Process Gas Leak Detection System ENS 429722006-11-07T14:59:0007 November 2006 14:59:00 10 CFR 76.120(c)(2) Process Gas Leak Detector Failure ENS 428662006-09-28T23:02:00028 September 2006 23:02:00 10 CFR 76.120(c)(2) Failure of Autoclave High Cylinder Pressure System ENS 427632006-08-10T22:05:00010 August 2006 22:05:00 10 CFR 76.120(c)(2) Inoperable High Pressure Fire Water System ENS 425902006-05-20T12:15:00020 May 2006 12:15:00 10 CFR 76.120(c)(2) High Pressure Transmitter Failure ENS 424942006-04-12T13:13:00012 April 2006 13:13:00 10 CFR 76.120(c)(2) Uf6 Release Detection System Failed During Testing ENS 422382006-01-02T10:38:0002 January 2006 10:38:00 10 CFR 76.120(c)(2) Report of Safety Equipment Failure ENS 421762005-11-29T14:45:00029 November 2005 14:45:00 10 CFR 76.120(c)(2) Faulty Switch Rendered Criticality Accident Alarm System Inoperable ENS 418822005-07-29T02:25:00029 July 2005 02:25:00 10 CFR 76.120(c)(2) Failure of Safety Equipment on C-310 Cylinder Valve Closure System ENS 413782005-02-06T16:08:0006 February 2005 16:08:00 10 CFR 76.120(c)(2) 24 Hour Report of a Safety Equipment Failure ENS 412442004-12-04T12:50:0004 December 2004 12:50:00 10 CFR 76.120(c)(2) High Pressure Transmitter Failure ENS 412232004-11-23T19:25:00023 November 2004 19:25:00 10 CFR 76.120(c)(2) Failure of Uf6 Release Detection System Due to Loss of Electrical Power ENS 407382004-05-09T06:30:0009 May 2004 06:30:00 10 CFR 76.120(c)(2) Failure of the High Voltage Uf6 Release Detection System ENS 404992004-02-02T10:15:0002 February 2004 10:15:00 10 CFR 76.120(c)(2) Failure of C-360 #1 Autoclave High Pressure Isolation System. ENS 404922004-01-30T15:41:00030 January 2004 15:41:00 10 CFR 76.120(c)(2) Safety Equipment Failure ENS 404382004-01-12T00:00:00012 January 2004 00:00:00 10 CFR 76.120(c)(2) Safety Equipment Fails to Function ENS 404232004-01-02T08:30:0002 January 2004 08:30:00 10 CFR 76.120(c)(2) Failure of Autoclave Isolation System 2014-05-08T15:24:00 | |