ENS 43563
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ENS Event | |
|---|---|
18:20 Aug 13, 2007 | |
| Title | Inoperable Radiation Monitors Due to Setpoint Calculation Errors |
| Event Description | On August 13, 2007 at 14:20 [EDT], the Susquehanna Control Room was notified that during review of calculations for the Secondary Containment Radiation Monitor Setpoints errors were identified in Tech Spec Allowable Values and TRM Trip Setpoints that rendered them non-conservative. The affected instruments are Refuel Floor Wall, Refuel Floor High, and Railroad Access radiation monitors. The condition affects both Susquehanna Units. The radiation monitors are required to be operable for conditions noted in footnotes (a), (b), and (c) in Tech Spec tables 3.3.6.2-1 and 3.3.7.1-1 (i.e. operations with a potential for draining the reactor vessel, during CORE ALTERATIONS and during movement of irradiated fuel assemblies in the secondary containment, and movement of irradiated fuel assemblies within or above the Railroad Access Shaft). The function of these instruments is to initiate systems that limit fission product release during and following certain postulated accidents and to minimize the consequences of radioactive material in the control room environment.
The radiation monitoring instruments were declared inoperable. All movement of irradiate fuel assemblies was halted (dry fuel storage activities were in progress at the time of notification). Based on this action, these monitors are no longer within the specified Applicability, and are therefore not currently required to be operable. The event has been determined to be reportable within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> under 10 CFR 50.72(b)(3)(v)(C) and 10 CFR 50.72(b)(3)(v)(D). The licensee notified the NRC Resident Inspector.
On August 13, 2007 PPL Susquehanna reported that during a review of calculations for the Secondary Containment Radiation Monitor Setpoints, errors were identified in Tech Spec Allowable Values and TRM Trip Setpoints that rendered them non-conservative. The affected monitors were declared inoperable and the required LCO & TRO Actions entered. A subsequent engineering review determined that the values used to establish the Tech Spec Allowable Values and TRM Trip Setpoints were based on a Realistic Source Term, not a Design Basis Source Term. These values were sufficiently conservative to compensate for the errors in the calculations and the dose release limits from a Design Basis Accident would not have been challenged. It was concluded that the existing Tech Spec values and setpoints remained valid and the monitors were operable in their original condition. Based on this conclusion Event Notification EN# 43563 is being retracted. The licensee notified the NRC Resident Inspector. R1DO ( Powell) was notified. |
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+1.48 h0.0617 days <br />0.00881 weeks <br />0.00203 months <br />) | |
| Opened: | Ron Fry 19:49 Aug 13, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Oct 3, 2007 |
| 43563 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Susquehanna with 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 | |
WEEKMONTHYEARENS 495652103-11-21T03:40:00021 November 2103 03:40:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Fails Drawdown Surveillance Testing ENS 564582023-04-08T00:52:0008 April 2023 00:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Injection (HPCI) System Inoperable ENS 564092023-03-14T14:00:00014 March 2023 14:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Injection Inoperable ENS 551282021-03-09T08:13:0009 March 2021 08:13:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Inoperable ENS 540782019-05-22T06:56:00022 May 2019 06:56:00 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)(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 530032017-10-06T23:45:0006 October 2017 23:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Control Room Habitability Envelope 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 502002014-06-13T08:52:00013 June 2014 08:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Both Trains of Control Structure Chilled Water ENS 501982014-06-12T18:44:00012 June 2014 18:44:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident System Restoration Error Causes Both Trains of Control Structure Chilled Water System to Be Inoperable 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 496132013-12-06T17:48:0006 December 2013 17:48:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable 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 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 488112013-03-07T06:35:0007 March 2013 06:35:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Declared Inoperable ENS 485952012-12-14T18:50:00014 December 2012 18:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown - Control Structure Chillers Inoperable 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 482932012-09-10T14:25:00010 September 2012 14:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Units Entered Technical Specification 3.0.3 Due to Inoperable Control Structure Chillers ENS 479192012-05-11T20:03:00011 May 2012 20:03:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Control Room Floor Cooling 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 478162012-04-09T05:02:0009 April 2012 05:02:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Control Structure Chillers Declared Inoperable While Switching Power Supplies ENS 478072012-04-04T22:35:0004 April 2012 22:35:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Inoperable Accident Mitigation Equipment ENS 473282011-10-06T15:40:0006 October 2011 15:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable ENS 469252011-06-04T20:14:0004 June 2011 20:14:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Control Structure Chillers Out of Service ENS 466442011-02-26T01:27:00026 February 2011 01:27:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 1 Hpci Inoperable Due to Steam Leak ENS 465192011-01-03T18:44:0003 January 2011 18:44:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Single Point of Failure Vulnerability Discovered Which Could Potentially Affect Accident Response ENS 462682010-09-22T12:30:00022 September 2010 12:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable Due to a Minor Lube Oil Leak ENS 452732009-08-18T13:20:00018 August 2009 13:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Turbine Stop Valve Fails in Midposition ENS 450732009-05-16T22:01:00016 May 2009 22:01:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Failure of High Pressure Coolant Injection Steam Supply Valve to Close During Test ENS 445032008-09-18T22:48:00018 September 2008 22:48:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Inoperable Due to Missing Insulation 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 428172006-08-31T15:11:00031 August 2006 15:11:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable Due to Stop Valve Indication Issue ENS 414632005-03-06T20:00:0006 March 2005 20:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Post-Accident Monitoring Instrumentation Inoperable ENS 413902005-02-09T14:20:0009 February 2005 14:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Trains of the Control Structure Emergency Outside Air Supply System Inoperable 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 ENS 402722003-10-23T20:40:00023 October 2003 20:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Nonemergency Notification Due to Failure to Maintain Control Structure Habitability Envelope ENS 401342003-09-05T13:33:0005 September 2003 13:33:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Declared Inoperable. 2103-11-21T03:40:00 | |
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