ENS 50055
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ENS Event | |
|---|---|
06:30 Apr 24, 2014 | |
| Title | Loss of Secondary Containment During Routine Swap of a Power Supplies |
| Event Description | On April 24, 2014 at 0230 [EDT], Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure lowered to 0.10 [negative inches] WG [Water Gauge] when restoring Unit 1 Zone 3 HVAC during a routine swap of RPS power supplies, due to a trip of the Unit 1 Zone 3 Supply fan. Zone 3 differential pressure was restored to > 0.25 [negative inches] WG at 0243 hours0.00281 days <br />0.0675 hours <br />4.017857e-4 weeks <br />9.24615e-5 months <br />. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable.
Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 WG [negative inches] at 0243 hours0.00281 days <br />0.0675 hours <br />4.017857e-4 weeks <br />9.24615e-5 months <br /> and was verified to be stable. LCO 3.6.4.1 was entered at 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br /> and exited at 0313 hours0.00362 days <br />0.0869 hours <br />5.175265e-4 weeks <br />1.190965e-4 months <br />. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 [negative inches] WG for all three Reactor Building Ventilation Zones when secondary containment is required. This event is being reported under 10CFR50.72(b)(3)(v)(C) and per the guidance of NUREG-1022,Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment System. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+1.33 h0.0554 days <br />0.00792 weeks <br />0.00182 months <br />) | |
| Opened: | Martin Lichtner 07:50 Apr 24, 2014 |
| NRC Officer: | Vince Klco |
| Last Updated: | Apr 24, 2014 |
| 50055 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Susquehanna with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
WEEKMONTHYEARENS 540782019-05-22T06:56:00022 May 2019 06:56:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Technical Specification Required Shutdown ENS 533102018-04-03T04:19:0003 April 2018 04:19:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Following Surveillance Testing ENS 532022018-02-12T03:03:00012 February 2018 03:03:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Out of Specification ENS 530982017-11-30T15:26:00030 November 2017 15:26:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Briefly Indicated Outside of Tech Spec Limit ENS 529732017-09-16T17:30:00016 September 2017 17:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure ENS 528922017-08-09T00:44:0009 August 2017 00:44:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure ENS 528442017-07-10T06:50:00010 July 2017 06:50:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Due to Failure of Non-Safety Related Discharge Damper ENS 528262017-06-24T14:28:00024 June 2017 14:28:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment ENS 527972017-06-09T09:09:0009 June 2017 09:09:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Exhaust Fan Breaker Failure Causing Low Secondary Containment Differential Pressure ENS 525992017-03-08T07:39:0008 March 2017 07:39:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Due to Containment Fan Trip ENS 525522017-02-15T18:37:00015 February 2017 18:37:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure ENS 523692016-11-16T15:45:00016 November 2016 15:45:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Failure of Unit 2 B Engineered Safeguards System Bus Sync Selector Switch ENS 522662016-09-27T20:44:00027 September 2016 20:44:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Leakage Exceeding Requirements ENS 522552016-09-22T07:20:00022 September 2016 07:20:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure ENS 519252016-05-13T05:10:00013 May 2016 05:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Manual Reactor Scram Due After Loss of an Essential Motor Control Center ENS 518722016-04-20T01:59:00020 April 2016 01:59:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Inoperable Secondary Containment ENS 518512016-04-06T17:37:0006 April 2016 17:37:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Reactor Building Airlock Doors Opened Simultaneously ENS 518302016-03-30T02:56:00030 March 2016 02:56:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure ENS 517772016-03-08T07:32:0008 March 2016 07:32:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Outside Specification ENS 517642016-03-02T18:30:0002 March 2016 18:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 517502016-02-22T18:45:00022 February 2016 18:45:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Unit 1 Secondary Containment Inoperable When Personnel Opened Both Access Doors Simultaneously ENS 515882015-12-06T10:46:0006 December 2015 10:46:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure Due to Exhaust Fan Trip ENS 515872015-12-06T08:50:0006 December 2015 08:50:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Differential Pressure Due to Icing of Intake Supply Plenum Screens ENS 515762015-12-01T17:45:0001 December 2015 17:45:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Reactor Building Airlock Doors Being Opened Simultaneously ENS 515332015-11-12T16:32:00012 November 2015 16:32:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 514322015-09-29T14:30:00029 September 2015 14:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Trains of the Standby Gas Treatment System Declared Inoperable ENS 513552015-08-27T17:47:00027 August 2015 17:47:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Brief Loss of Secondary Containment Due to Both Airlock Doors Open Simultaneously ENS 512692015-07-27T15:18:00027 July 2015 15:18:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Due to Opening Single Door Without Proper Authorization ENS 510402015-05-04T18:39:0004 May 2015 18:39:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Low Differential Pressure Resulting in Loss of Secondary Containment ENS 510172015-04-27T12:50:00027 April 2015 12:50:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Boundary Door Found Ajar ENS 510012015-04-22T02:58:00022 April 2015 02:58:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Inoperable Secondary Containment ENS 509742015-04-11T04:51:00011 April 2015 04:51:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Failure of Running Fans ENS 508852015-03-13T13:19:00013 March 2015 13:19:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Due to Ventilation Plenum Door Open ENS 505952014-11-05T16:15:0005 November 2014 16:15:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Zones 2 and 3 Unintentionally Crosstied ENS 500552014-04-24T06:30:00024 April 2014 06:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment During Routine Swap of a Power Supplies ENS 500402014-04-17T07:35:00017 April 2014 07:35:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment During Preparation for Loca/Loop Testing ENS 498842014-03-08T08:25:0008 March 2014 08:25:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Unit 2 Loss of Secondary Containment Due to Discharge Damper Failure ENS 498672014-03-04T05:25:0004 March 2014 05:25:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Declared Inoperable During Surveillance Testing ENS 498212014-02-12T12:11:00012 February 2014 12:11:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Boundry Door Found Ajar ENS 496142013-12-07T14:50:0007 December 2013 14:50:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Fails Retest of Drawdown Surveillance Test ENS 495882013-11-27T15:01:00027 November 2013 15:01:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Unit 1 Reactor Building Secondary Containment Differential Pressure Out of Specification ENS 495652013-11-21T03:40:00021 November 2013 03:40:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Fails Drawdown Surveillance Testing ENS 495312013-11-13T07:26:00013 November 2013 07:26:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Zone II Differential Pressure Lost During Recovery from Ventilation Drawdown Test ENS 494922013-11-01T07:09:0001 November 2013 07:09:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Not within Limits Following Trip of Exhaust Fan ENS 494892013-10-31T06:51:00031 October 2013 06:51:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Not within Limits Following Trip of Exhaust Fan ENS 494652013-10-23T10:20:00023 October 2013 10:20:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Reactor Building Differential Pressure Less than Required by Technical Specifications ENS 494322013-10-13T08:20:00013 October 2013 08:20:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure at Zero Inches Water Gauge ENS 485252012-11-20T11:45:00020 November 2012 11:45:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Condition That Could Have Prevented Automatic Isolation of Reactor Water Cleanup System ENS 478442012-04-17T19:40:00017 April 2012 19:40:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Unit 2 Secondary Containment Affected by Violation of Unit 1 Secondary Containment Integrity During Outage ENS 439632008-02-05T23:45:0005 February 2008 23:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Irradiated Fuel Movement Performed with a Required Accident Mitigation/Radiation Release System Bypassed ENS 435632007-08-13T18:20:00013 August 2007 18:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Inoperable Radiation Monitors Due to Setpoint Calculation Errors ENS 412152004-11-22T20:10:00022 November 2004 20:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Portion of Primary Instrument Lines Not Aligned to Secondary Containment ENS 409702004-08-20T16:15:00020 August 2004 16:15:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Railroad Access Process Radiation Monitors Actuation Capability Was Inadvertently Defeated ENS 406462004-04-05T15:40:0005 April 2004 15:40:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Safety Function for Emergency Diesel Generators During Surveillance Testing 2019-05-22T06:56:00 | |
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