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Category:Letter
MONTHYEARIR 05000352/20243012024-02-0202 February 2024
Initial Operator Licensing Examination Report 05000352/2024301 and 05000353/2024301
IR 05000352/20230042024-01-31031 January 2024
Integrated Inspection Report 05000352/2023004 and 05000353/2023004
IR 05000352/20240112024-01-31031 January 2024
Information Request to Support Post-Approval Site Inspection for License Renewal; Inspection Report 05000352/2024011
ML24026A2962024-01-26026 January 2024
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System (PPS)- Syrs, .
ML24004A0342024-01-17017 January 2024
Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0026 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting))
IR 05000352/20230102024-01-11011 January 2024
Age-Related Degradation Report 05000352/2023010 and 05000353/2023010
IR 05000352/20234012023-12-21021 December 2023
Cybersecurity Inspection Report 05000352/2023401 and 05000353/2023401
ML23321A2362023-12-14014 December 2023
Issuance of Amendment Nos. 262 and 224 Adoption of TSTF-477, Revision 3 and Associated Technical Specification Changes
ML23278A1292023-12-14014 December 2023
Units 1 & 2; Limerick, Units 1 & 2; Nine Mile Point, Units 1 & 2; and Peach Bottom, Units 2 & 3 -Revision to Approved Alternatives to Use Boiling Water Reactor Vessel and Internals Project Guidelines
ML23333A2182023-11-29029 November 2023
Operator Licensing Examination Approval
ML23325A2062023-11-21021 November 2023
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System
ML23313A0432023-11-13013 November 2023
Summary of Regulatory Audit in Support of Amendment Request for Control Room Air Conditioning Technical Specifications
ML23317A1192023-11-10010 November 2023
Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums
IR 05000352/20230032023-10-27027 October 2023
Integrated Inspection Report 05000352/2023003 and 05000353/2023003 and Independent Spent Fuel Storage Installation Inspection 07200065/2023001
ML23297A1722023-10-24024 October 2023
Request for Information for a Biennial Problem Identification and Resolution Inspection; Inspection Report 05000352/2024010 and 05000353/2024010
IR 05000352/20235012023-10-17017 October 2023
Emergency Preparedness Biennial Exercise Inspection Report 05000352/2023501 and 05000353/2023501
RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023
Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans
ML23279A0612023-10-0505 October 2023
Paragon Energy Solutions LLC, Part 21 Final Report Re Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs)
ML23276A5162023-10-0303 October 2023
Federal Emergency Management Agency Level 1 Finding from 2023 Evaluated Emergency Preparedness Exercise
ML23275A1082023-09-29029 September 2023
FEMA Level 1 Findings Limerick NPP- Boyertown/Colebrookdale
ML23241A9452023-09-27027 September 2023
Generation Station, Units 1 and 2 Regulatory Audit Plan Supporting Review of the Equipment Qualification Portion of Limerick Digital Instrumentation and Controls License Amendment Request
ML23269A0522023-09-26026 September 2023
Request for Information and Notification of Conduct of IP 71111.21.N.04, Age-Related Degradation, Reference Inspection Report 05000352/2023010 and 05000353/2023010
ML23255A0952023-09-12012 September 2023
Resubmittal of License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System (PPS) to Address
ML23254A0242023-09-0606 September 2023
Paragon Energy Solutions LLC, Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs)
ML23249A1002023-09-0606 September 2023
Requalification Program Inspection
IR 05000352/20230052023-08-31031 August 2023
Updated Inspection Plan for Limerick Generating Station, Units 1 and 2 (Report 05000352/2023005 and 05000353/2023005)
ML23248A2082023-08-31031 August 2023
UFSAR Cover Page
ML23242A2172023-08-30030 August 2023
Response to Request for Additional Information for Application to Adopt TSTF-477, Revision 3, Add Action for Two Inoperable Control Room AC Subsystems and Associated Technical Specification Changes
NMP2L2851, Relief Request Associated with Successive Inspections for Generic Letter 88-01 / BWRVIP-75-A Augmented Examinations2023-08-25025 August 2023
Relief Request Associated with Successive Inspections for Generic Letter 88-01 / BWRVIP-75-A Augmented Examinations
ML23228A0942023-08-16016 August 2023
Response to Request for Additional Information for Supplemental License Amendment Request to Revise Technical Specifications and Exemption Request from Requirements of 10CFR50.62 ATWS Rule to Support the .
IR 05000352/20230022023-08-14014 August 2023
Integrated Inspection Report 05000352/2023002 and 05000353/2023002
ML23220A0182023-08-0808 August 2023
Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection 05000352/2023401 and 05000353/2023401
RS-23-087, Revision to Approved Alternatives Associated with the Use of the BWRVIP Guidelines in Lieu of Specific ASME Code Requirements on Reactor2023-08-0404 August 2023
Revision to Approved Alternatives Associated with the Use of the BWRVIP Guidelines in Lieu of Specific ASME Code Requirements on Reactor
ML23212B2362023-07-31031 July 2023
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System - WEC Documents
ML23212B1052023-07-31031 July 2023
Supplement to License Amendment Request to Revise Technical Specifications and Exemption Request from Requirements of 10CFR50.62 ATWS Rule to Support the Digital Modernization Project Installation - Revise
ML23202A2192023-07-21021 July 2023
Response to Request for Additional Information for Supplemental License Amendment Request to Revise Technical Specifications and Exemption Request from Requirements of 10CFR50.62 ATWS Rule to Support the .
ML23193B0122023-07-20020 July 2023
Audit Plan in Support of Review of License Amendment Request and Exemption Request for Digital Instrumentation and Controls Installation Support (Epids L-2023-LLA-0025 and L-2023-LLE-0005)
ML23187A0962023-07-19019 July 2023
Generation Station, Unit Nos. 1 and 2 - Revised Estimated Review Completion Date Concerning License Amendment Request to Replace Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System
ML23208A1522023-07-0606 July 2023
PEMA Letter Dated 7-6-23 Re Limerick Exercise 9-26-23
ML23177A2242023-06-26026 June 2023
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection .
ML23145A1972023-06-23023 June 2023
Correction to the Renewed Facility Operating License Pages in Amendment Nos. 255, 256, 257, 258, 259, and 260
2024-02-02
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TRM 3.3.7.2 March 8, 2011 U.S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Units 1 and 2 Facility Operating License Nos. NPF-39 and NPF-85 NRC Docket Nos. 50-352 and 50-353
Subject:
Special Report - Seismic Monitoring Instrumentation Inoperability, Rev. 2
References:
(1) Special Report - Seismic Monitoring Instrumentation Inoperability, Rev. 1, date 1/25/11 (2) Special Report - Seismic Monitoring Instrumentation Inoperability, Rev. 0, date 4/23/10 This Special Report is being updated and re-submitted pursuant to the requirements of Limerick Generating Station (LGS), Unit 1 and Unit 2 Updated Final Safety Analysis Report (UFSAR) section 3.7.4.5, Technical Specification 6.9.2, and Technical Requirements Manual 3.3.7.2 which states With one or more of the seismic monitoring instruments inoperable for more than 30 days, a Special Report shall be prepared and submitted to the Nuclear Regulatory Commission pursuant to Specification 6.9.2 of the Technical Specifications within the next ten days outlining the cause of the malfunction and the plans for restoring the instrument(s) to operable status. This revised report describes the identification of additional inoperable instruments. All of the seismic monitoring instruments, except the Spray Pond Pump House instrument, are now inoperable due to surveillance testing that could not be performed. The test could not be performed due to an inoperable power supply. The surveillance test (ST-2-036-600-0) is now overdue and will be performed following repair of the failed power supply.
On Tuesday, March 16, 2010, Unit 1 was operating at 94% power due to end-of-cycle coast down and Unit 2 was operating at full power with functional testing of the seismic monitoring instrumentation system in progress. During the test, the Operating Basis Earthquake (OBE) red light failed to illuminate and the "OBE exceeded" alarm failed to operate as expected.
Operations declared the triaxial response spectrum analyzer inoperable. The failure was later determined to be caused by faulty test equipment.
Special Report Inoperable Seismic Monitor Docket Nos. 50-352 and 50-353 March 8, 2011 Page 2 On Thursday, April 22, 2010, both units were operating at full power and seismic instrumentation surveillance test (ST-2-036-426-0) was in progress. The test was being performed as the post maintenance test (PMT) for the inoperable triaxial response spectrum analyzer which passed the test and was later declared operable. However, during the test, the seismic monitor sensor array XE-VA-105 for D Main Steam Line (MSL) failed to provide the expected indication. The time response of channel #2 did not respond per the ST requirement. Instrumentation and Control (I&C) and Engineering personnel determined that D MSL channel sensor array of the seismic monitor was degraded. Accordingly, Operations declared the sensor inoperable. The degraded sensor array is located in the Unit 1 drywell and cannot be accessed for recalibration or repair without a plant outage.
On Friday, December 17, 2010, during a test of the seismic monitor alarm panel the annunciator lights and tone alarms did not function. Operations declared the instrument inoperable. Troubleshooting determined that an instrument power supply was failed. An equivalent power supply is being procured. The power supply is expected to be approved for use by June 27, 2011. The instrument is expected to be operable by July 29, 2011.
On Thursday, January 27, 2011, the Seismic Monitoring - Triaxial Time-History Accelerometers Recorders and Triaxial Response Spectrum Analyzer Functional Test (ST-2-036-600-0) exceeded its due date resulting in all of the instruments on the Seismic Monitor, except the Spray Pond instrument, being inoperable. The test could not be performed due to an inoperable power supply which is expected to be repaired by July 29, 2011.
The Seismic Monitoring System consists of two systems. One system is located in the main Control Room (MCR) with 5 sensors located at various plant locations and elevations. The MCR Seismic Monitor has 5 tri-axial time history accelerometers, 1 response spectrum analyzer, 5 digital recorders and a playback unit. Four of the five sensor arrays are still providing indications but are statused as inoperable due to the overdue surveillance test. The fifth sensor is available but degraded. The seismic monitor sensor array (XE-VA-105) that is located in the drywell of Unit 1 will be repaired, tested, and returned to operable status by the end of 1R14 refueling outage (April 2012). The triaxial response spectrum analyzer will be repaired, tested and returned to operable status by July 29, 2011. These commitments are contained in the attachment to this letter.
The second system is a stand-alone system located at the Spray Pond Pump House. The Spray Pond Seismic Monitor is a self-contained system with its own sensor array not associated with the MCR Seismic Monitor. The Spray Pond Seismic Monitor remains operable and is not affected by the overdue testing. The Spray Pond Seismic Monitor is tested via ST-2-036-606-0 and is due July 6, 2011 and is not impacted by the MCR equipment that is out of service.
Special Report Inoperable Seismic Monitor Docket Nos. 50-352 and 50-353 March 8, 2011 Page 3 If you have any questions or require additional information, please do not hesitate to contact us.
Sincerely, Original signed by William F. Maguire Vice President - Limerick Generating Station Exelon Generation Company, LLC
Attachment:
List of commitments cc: W.M. Dean, Administrator, Region I, NRC E.M. DiPaolo, NRC Senior Resident Inspector, Limerick
SUMMARY
OF EXELON NUCLEAR COMMITMENTS The following table identifies commitments made in this document. (Any other actions discussed in the submittal represent intended or planned actions. They are described to the NRC for the NRC's information and are not regulatory commitments.)
Committed Commitment Type Commitment Date or One-Time Action Programmatic "Outage" (Yes/No) (Yes/No)
The degraded seismic monitor sensor Outage Yes No array (XE-VA-105) that is located in the drywell of Unit 1 will be repaired, tested, and returned to operable status by the end of the 1R14 refueling outage (April 2012).
The triaxial response spectrum 7/29/11 Yes No analyzer will be repaired, tested and returned to operable status by July 29, 2011.
