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Category:Inspection Report
MONTHYEARIR 05000373/20230042024-01-24024 January 2024 County Station - Integrated Inspection Report 05000373/2023004 and 05000374/2023004 IR 05000373/20230122024-01-18018 January 2024 County Station - Biennial Problem Identification and Resolution Inspection Report 05000373/2023012 and 05000374/2023012 IR 05000373/20234022023-12-20020 December 2023 County Station - Security Baseline Inspection Report 05000373/2023402 and 05000374/2023402 IR 05000373/20230032023-11-0909 November 2023 County Station Integrated Inspection Report 05000373/2023003, 05000374/2023003, and 07200070/2023001 IR 05000373/20234012023-11-0707 November 2023 County Station Security Baseline Inspection Report 05000373/2023401 and 05000374/2023401 IR 05000374/20230102023-10-11011 October 2023 NRC Inspection Report 05000374/2023010 IR 05000373/20233012023-09-15015 September 2023 Errata to NRC Initial License Examination Report 05000373/2023301; 05000374/2023301 IR 05000373/20230022023-08-0101 August 2023 County Station - Integrated Inspection Report 05000373/2023002 and 05000374/2023002 IR 05000373/20230112023-06-26026 June 2023 County Station - Quadrennial Fire Protection Team Inspection Report 05000373/2023011 and 05000374/2023011 IR 05000373/20230012023-05-10010 May 2023 County Station - Integrated Inspection Report 05000373/2023001 and 05000374/2023001 IR 05000373/20220062023-03-0101 March 2023 Annual Assessment Letter for LaSalle County Station, Units 1 and 2 (Report 05000373/2022006 and 05000374/2022006) IR 05000373/20220042023-01-31031 January 2023 County Station - Integrated Inspection Report 05000373/2022004 and 05000374/2022004 IR 05000373/20224042022-12-21021 December 2022 County Station - Material Control and Accounting Program Inspection Report 05000373/2022404 and 05000374/2022404 IR 05000373/20225012022-12-0505 December 2022 County Station - Emergency Preparedness Biennial Exercise Inspection Report 05000373/2022501 and 05000374/2022501 IR 05000373/20224022022-11-17017 November 2022 County Station - Security Baseline Inspection Report 05000373/2022402 and 05000374/2022402 IR 05000373/20220112022-11-0101 November 2022 County Station Design Basis Assurance Inspection (Teams) Inspection Report 05000373/2022011 and 05000374/2022011 IR 05000373/20220032022-11-0101 November 2022 County Station - Integrated Inspection Report 05000373/2022003 and 05000374/2022003 IR 05000373/20224032022-09-15015 September 2022 County Station - Cyber Security Inspection Report 05000373/2022403 and 05000374/2022403 IR 05000373/20220052022-08-22022 August 2022 Updated Inspection Plan for Lasalle County Station (Report 05000373/2022005; 05000374/2022005) IR 05000373/20220022022-08-10010 August 2022 County Station - Integrated Inspection Report 05000373/2022002 and 05000374/2022002 IR 05000373/20224012022-05-18018 May 2022 County Station - Security Baseline Inspection Report 05000373/2022401 and 05000374/2022401 IR 05000373/20220012022-04-26026 April 2022 County Station - Integrated Inspection Report 05000373/2022001 and 05000374/2022001 ML22108A2802022-04-19019 April 2022 Information Request for an NRC Triennial Baseline Design Bases Assurance Inspection (Team) Inspection Report 05000373/2022011 05000374/20220 IR 05000373/20220102022-03-15015 March 2022 County Station License Renewal Phase 2 Report 05000373/2022010 IR 05000373/20210062022-03-0202 March 2022 Annual Assessment Letter (Report 05000373/2021006 and 05000374/2021006) IR 05000373/20210042022-02-0707 February 2022 County Station Integrated Inspection Report 05000373/2021004 and 05000374/2021004 IR 05000373/20210132022-01-20020 January 2022 County Station Biennial Problem Identification and Resolution Inspection Report 05000373/2021013 and 05000374/2021013 IR 05000373/20214022021-12-15015 December 2021 County Station - Security Baseline Inspection Report 05000373/2021402 and 05000374/2021402 IR 05000373/20210032021-11-0808 November 2021 County Station Integrated Inspection Report 05000373/2021003; 05000374/2021003 and 07200070/2021001 IR 05000373/20210022021-11-0101 November 2021 County Station Integrated Inspection Report 05000373/2021002 and 05000374/2021002 IR 05000373/20210122021-10-28028 October 2021 County Station- 50.59 Team Inspection Report 05000373/2021012 and 05000374/2021012 IR 05000373/20210052021-09-0101 September 2021 Updated Inspection Plan for Lasalle County Station, Units 1 and 2; Report 05000373/2021005 and 05000374/2021005 IR 05000373/20210112021-08-23023 August 2021 County Station - Design Basis Assurance Inspection (Programs) Inspection Report 05000373/2021011 and 05000374/2021011 IR 05000373/20215012021-06-16016 June 2021 County Station - Emergency Preparedness Biennial Exercise Inspection Report 05000373/2021501 and 05000374/2021501 IR 05000373/20214012021-05-18018 May 2021 County Station - Security Baseline Inspection Report 05000373/2021401 and 05000374/2021401 IR 05000373/20210012021-05-0404 May 2021 Lssalle County Station - Integrated Inspection Report 05000373/2021001 and 05000374/2021001 IR 05000374/20210102021-04-0505 April 2021 County Station - Post-Approval Site Inspection for License Renewal (Phase I) Report 05000374/2021010 IR 05000373/20200042021-03-0505 March 2021 Reissue - Lasalle County Station - Integrated Inspection Report 05000373/2020004; 05000374/2020004; 05000373/2020501; 05000374/2020501; 05000373/2020011 and 05000374/2020011 IR 05000373/20200062021-03-0404 March 2021 Annual Assessment Letter for Lasalle County Station Units 1 and 2 (Report 05000373/2020006 and 05000374/2020006) ML21043A1982021-02-12012 February 2021 County Station - Integrated Inspection Report 05000373/2020004; 05000374/2020004; 05000373/2020501 and 05000374/2020501 IR 05000373/20204022021-01-0505 January 2021 County Station - Security Baseline Inspection Report 05000373/2020402 and 05000374/2020402 IR 05000373/20203012020-12-17017 December 2020 NRC Initial License Examination Report 05000373/2020301; 05000374/2020301 IR 05000373/20200032020-12-11011 December 2020 County Station - Integrated Inspection Report 05000373/2020003 and 05000374/2020003 IR 05000373/20200052020-09-0101 September 2020 Updated Inspection Plan for Lasalle County Station, Units 1 and 2 (Report 05000373/2020005 and 05000374/2020005) IR 05000373/20200022020-08-11011 August 2020 County Station - Integrated Inspection Report 05000373/2020002 and 05000374/2020002 IR 05000373/20200122020-06-0505 June 2020 County Station - Triennial Fire Protection Inspection Report 05000373/2020012 and 05000374/2020012 IR 05000373/20200012020-05-11011 May 2020 County Station - Integrated Inspection Report 05000373/2020001 and 05000374/2020001 IR 05000373/20204012020-03-16016 March 2020 Security Baseline Inspection Report 05000373/2020401 and 05000374/2020401 IR 05000373/20190062020-03-0303 March 2020 Annual Assessment Letter for LaSalle County Station, Units 1 and 2 (Report 05000373/2019006 and 05000374/2019006) IR 05000373/20200102020-02-25025 February 2020 Post-Approval Site Inspection for License Renewal (Phase I) Report 05000373/2020010 2024-01-24
[Table view] Category:Letter
MONTHYEARIR 05000373/20230042024-01-24024 January 2024 County Station - Integrated Inspection Report 05000373/2023004 and 05000374/2023004 ML24024A1332024-01-24024 January 2024 Confirmation of Initial License Examination IR 05000373/20230122024-01-18018 January 2024 County Station - Biennial Problem Identification and Resolution Inspection Report 05000373/2023012 and 05000374/2023012 ML23354A2902024-01-0505 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0028 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML23360A6082023-12-27027 December 2023 County Station Request for Information for NRC Commercial Grade Dedication Inspection: Inspection Report 05000373/2024010 and 05000374/2024010 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 ML23305A1402023-12-13013 December 2023 Units 1 & 2; Nine Mile Point, Unit 2; Peach Bottom, Units 2 & 3; and Quad Cities, Units 1 and 2 - Issuance of Amendments to Adopt Traveler TSTF-580 ML23317A1192023-11-10010 November 2023 Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums RS-23-120, Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information2023-11-10010 November 2023 Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information IR 05000373/20230032023-11-0909 November 2023 County Station Integrated Inspection Report 05000373/2023003, 05000374/2023003, and 07200070/2023001 ML23286A2602023-11-0808 November 2023 Issuance of Amendment Nos. 260 and 245 to Renewed Facility Operating Licenses Relocation of Pressure and Temperature Limit Curves to the Pressure Temperature Report IR 05000373/20234012023-11-0707 November 2023 County Station Security Baseline Inspection Report 05000373/2023401 and 05000374/2023401 RS-23-103, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-10-13013 October 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation 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 IR 05000374/20230102023-10-11011 October 2023 NRC Inspection Report 05000374/2023010 IR 05000373/20233012023-09-15015 September 2023 Errata to NRC Initial License Examination Report 05000373/2023301; 05000374/2023301 RS-23-080, Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs2023-08-30030 August 2023 Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs 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 ML23212A9012023-08-0303 August 2023 Regulatory Audit Report to Support the Review of the Amendments to Relocation of the Pressure Temperature Limit Curves to the Pressure and Temperature Limits Report IR 05000373/20230022023-08-0101 August 2023 County Station - Integrated Inspection Report 05000373/2023002 and 05000374/2023002 ML23208A3182023-07-27027 July 2023 Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and RFI RS-23-084, Response to Request for Additional Information Regarding the Application to Revise Design Basis to Allow Use of Plastic Section Properties in Lower Downcomer Braces Analysis2023-07-24024 July 2023 Response to Request for Additional Information Regarding the Application to Revise Design Basis to Allow Use of Plastic Section Properties in Lower Downcomer Braces Analysis ML23192A5272023-07-12012 July 2023 NRC Initial License Examination Report 05000373/2023301; 05000374/2023301 ML23186A2062023-07-0606 July 2023 Information Request for a NRC Post-Approval Site Inspection for License Renewal 05000374/2023010 ML23181A1502023-06-30030 June 2023 Combined Response to Request for Additional Information and Supplemental Information in Support of LAR to Relocate Pressure and Temperature Limit Curves to the Pressure and Temperature Limits Report ML23178A2422023-06-28028 June 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch III IR 05000373/20230112023-06-26026 June 2023 County Station - Quadrennial Fire Protection Team Inspection Report 05000373/2023011 and 05000374/2023011 RS-23-077, Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations2023-06-16016 June 2023 Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations ML23167A0352023-06-16016 June 2023 Registration of Use of Cask to Store Spent Fuel ML23171A9562023-06-12012 June 2023 Post Exam Ltr RS-23-042, Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling2023-05-25025 May 2023 Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling IR 05000373/20230012023-05-10010 May 2023 County Station - Integrated Inspection Report 05000373/2023001 and 05000374/2023001 ML23123A2202023-05-0303 May 2023 Relief Request I4R-14 for Alternative Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection ML23118A3472023-05-0101 May 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Correction of Amendment No. 193 Adoption of TSTF-306, Revision 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration EPID L-2022-LLA-0143 ML23121A1612023-05-0101 May 2023 Information Meeting (Open House) with a Question-and-Answer Session to Discuss NRC 2022 End-of-Cycle Plant Performance Assessment of LaSalle County Station, Units 1 and 2 ML23114A2522023-04-28028 April 2023 Request to Use a Provision of a Later Edition of the ASME Boiler & Pressure Vessel Code, Section XI ML23081A0382023-04-25025 April 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Issuance of Amendments to Adopt TSTF-306, Rev. 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection ML23107A1822023-04-18018 April 2023 Operator Licensing Examination Approval Lasalle County Station, May 2023 RS-23-049, Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations2023-03-23023 March 2023 Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations ML23073A2182023-03-22022 March 2023 Issuance of Amendment No. 258 to Renewed Facility Operating Licenses Exigent Amendment to Revise Design Basis Related to Seismic Requirements RS-23-048, Exigent Amendment Request to Revise Design Basis Related to Seismic Requirements2023-03-0707 March 2023 Exigent Amendment Request to Revise Design Basis Related to Seismic Requirements ML23061A1632023-03-0303 March 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch 3 IR 05000373/20220062023-03-0101 March 2023 Annual Assessment Letter for LaSalle County Station, Units 1 and 2 (Report 05000373/2022006 and 05000374/2022006) RS-23-045, Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.2032023-02-28028 February 2023 Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.203 RS-23-037, Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for LaSalle County Station2023-02-22022 February 2023 Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for LaSalle County Station ML23024A1372023-02-0303 February 2023 Request for Withholding Information from Public Disclosure for LaSalle County Station, Unit Nos. 1 and 2 ML23031A1972023-01-31031 January 2023 Notification of NRC Fire Protection Team Inspection Request for Information, Inspection Report Nos. 05000373/2023011 and 05000374/2023011 IR 05000373/20220042023-01-31031 January 2023 County Station - Integrated Inspection Report 05000373/2022004 and 05000374/2022004 RS-23-003, Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-102023-01-31031 January 2023 Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-10 2024-01-05
[Table view] |
Inspection Report - LaSalle - 2019013 |
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Text
November 21, 2019 Mr. Bryan Senior VP, Exelon Generation Company, LLC President and CNO, Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555 SUBJECT: LASALLE COUNTY STATION, UNITS 1 AND 2 - NRC INSPECTION OF TEMPORARY INSTRUCTION 2515/194, INSPECTION OF THE LICENSEES IMPLEMENTATION OF INDUSTRY INITIATIVE ASSOCIATED WITH THE OPEN PHASE CONDITION DESIGN VULNERABILITIES IN ELECTRIC POWER SYSTEMS (NRC BULLETIN 2012-01) REPORT 05000373/2019013 AND 05000374/2019013
Dear Mr. Hanson:
On October 4, 2019, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Lasalle County Station, Units 1 And 2. On October 4, 2019, the NRC inspectors discussed the results of this inspection with Phil Hansett and other members of your staff. The results of this inspection are documented in the enclosed report.
The NRC inspectors did not identify any finding or violation of more than minor significance.
This letter, its enclosure, and your response (if any) will be made available for public inspection and copying at http://www.nrc.gov/reading-rm/adams.html and at the NRC Public Document Room in accordance with 10 CFR 2.390, Public Inspections, Exemptions, Requests for Withholding.
Sincerely,
/RA Karla Stoedter for/
Robert C. Daley, Chief Engineering Branch 3 Division of Reactor Safety Docket Nos. 05000373 and 05000374 License Nos. NPF-11 and NPF-18
Enclosure:
As stated
Inspection Report
Docket Numbers: 05000373 and 05000374 License Numbers: NPF-11 and NPF-18 Report Numbers: 05000373/2019013 and 05000374/2019013 Enterprise Identifier: I-2019-013-0014 Licensee: Exelon Generation Company, LLC Facility: LaSalle County Station, Units 1 and 2 Location: Marseilles, IL Inspection Dates: September 30, 2019 - October 4, 2019 Inspectors: Ijaz Hafeez, Reactor Inspector Approved By: Robert C. Daley, Chief Engineering Branch 3 Division of Reactor Safety Enclosure
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an NRC Inspection of Temporary Instruction 2515/194, inspection of the Licensees Implementation of Industry Initiative Associated with the Open Phase Condition Design Vulnerabilities in Electric Power Systems (NRC BULLETIN 2012-01) at LaSalle County Station, Units 1 and 2 in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRCs program for overseeing the safe operation of commercial nuclear power reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more information.
List of Findings and Violations No findings or violations of more than minor significance were identified.
Additional Tracking Items None.
INSPECTION SCOPES
Inspections were conducted using the appropriate portions of the inspection procedures (IPs) in effect at the beginning of the inspection unless otherwise noted. Currently approved IPs with their attached revision histories are located on the public website at http://www.nrc.gov/reading-rm/doc-collections/insp-manual/inspection-procedure/index.html. Samples were declared complete when the IP requirements most appropriate to the inspection activity were met consistent with Inspection Manual Chapter (IMC) 2515, Light-Water Reactor Inspection Program - Operations Phase. The inspectors reviewed selected procedures and records, observed activities, and interviewed personnel to assess licensee performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.
INSPECTION RESULTS
Observation: Detection, Alarms, and General Criteria 2515/194
- (1) Open Phase Conditions (OPCs) that are detected will be alarmed in the Main Control Room (MCR) common annunciator panel.
- (2) See item 2 in table titled Detection, Alarms, and General Criteria Exceptions for inspector identified exceptions.
- (3) The licensees design document, test results and analysis showed that the short time delay (a time delay of 0.65 seconds was selected for the OPC relays to coordinate with the fault clearing time of 345kV switchyard primary and zone 2 relays) used in the open phase condition design/protective scheme is expected to minimize misoperation or spurious trips in the range of voltage unbalances normally expected in the transmission system. The analysis also showed that the time delay may properly coordinated with switchyard fault assumptions. Based on this, the inspector had reasonable assurance that the actuation circuit design would not result in lower overall plant operation reliability. Additionally, the OPC scheme was activated or placed in-service in October of 2017. Since that time, there have not been any inadvertent actuations of this system that resulted in a trip signal or spurious actions.
- (4) No Class-1E circuits were being replaced with non-Class 1E circuits in the design.
- (5) The licensee revised Lasalle Updated Final Safety Analysis Report (UFSAR),
Section 8.3.1.1.2. Offsite Power Sources (SATs), and added the loss of phase protection to Table 8.3-2. The change was incorporated into the UFSAR Report.
See item 5 in table titled Detection, Alarms, and General Criteria Exceptions for inspector identified exceptions.
Observation: Protective Actions Criteria 2515/194
- (1) LaSalle County Station has determined that OPCs are credible events and have implemented design changes to mitigate the effects. EC 387695 and EC 387696 have installed an open phase relay scheme to detect, alarm and protect from open phase conditions.
- (2) The inspectors determined that with an open phase condition present and no accident condition signal, the OPC protection relay system would not adversely affect the function of important-to-safety systems, structures and components when the trip function is active.
As per the design description, the OPC relays will trip the System Auxiliary Transformer (SAT) lockout relays after a 0.65 second time delay. The SAT lockout relays would isolate the SAT by opening both primary and secondary side breakers. After the SAT isolates, an automatic fast transfer connects the safety-related buses fed by the SAT to the Unit Auxiliary Transformer (UAT). The licensees analysis verified that the OPC relays can detect and isolate an OPC prior to any motor damage. The algorithm time delay limits the motors exposure to negative sequence current which helps prevent excessive motor heating.
The Lasalle UFSAR states that during a power loss to the M-G set, the high-inertia flywheel is designed to maintain generator output within 5% of rated values for at least one second to keep the Reactor Protection System (RPS) bus energized. The fast bus transfer from the SAT to UAT recovers the bus voltage allowing RPS operation to be sustained throughout the transient. Analyses completed by the licensee support the ability of this arrangement to be completed within associated time constraints.
See item 2 in table titled Protective Actions Criteria Exceptions for inspector identified exceptions.
- (3) See item 3 in table titled Protective Actions Criteria Exceptions for inspector identified exceptions.
- (4) No surveillance requirements for the SEL 451-5 were added to the plant Technical Specifications.
See item 4 in table titled Protective Actions Criteria Exceptions for inspector identified exceptions.
Observation: Detection, Alarms, and General Criteria Exceptions 2515/194
- (2) Based on review of the licensees calculation for the relay settings used in the OPC algorithms, the inspectors determined that the OPC relay detection does not function under all loading conditions. The design is sensitive enough to identify an OPC when SAT transformer loading is above the MINLOAD threshold. To insure detection of an OPC, the design/implementation of OPC detection at LaSalle has a minimum loading requirement for the SAT transformers. Specifically, an OPC will be detected as long as the primary positive sequence current in the SAT is greater than the MINLOAD (low load)alarm setting. (approximately 3.6MVA (L-003786, Revision 0)). During normal operations, the SATs are routinely loaded above the MINLOAD threshold.
- (5) While the change was incorporated into UFSAR table as a trip to the SAT lockout relays, the revision did not reference any design analysis, discuss design features, discuss theory of operation for the OPC system, or list major components associated with the open phase condition equipment in detail. However, the licensee maintained that the level of detail provided in the UFSAR for the open phase condition protection was consistent with the level of detail provided for other non-safety conditions that provide an input to the associated transformer lockout relay trips.
Observation: Protective Actions Criteria Exceptions 2515/194
- (2) During low loading of the SAT or open phase detection (OPD) relay trouble alarms, manual actions may be required to address the existence of an OPC condition. The inspectors discussed the potential need for manual actions with the licensee and the licensee agreed that the current procedures did not specifically address implementation of protective actions if manual actions were required. The lack of guidance for system response when manual actions are needed, and weaknesses identified in alarm response procedures was captured in IR 04284977, NRC IDD Procedure Enhancement.
- (3) The following information was aggregated from engineering analyses, training materials and conversations with licensee staff as a detailed description of the system operation and performance was not located within the UFSAR.
The inspectors noted that, for the case where an OPC occurs and an accident condition (LOCA) signal are present simultaneously, safety-related equipment would receive a start request and would attempt to start while the OPC exists on the safety-related buses. This first start attempt occurs due to the time delay associated with 1) OPC coordination with other protective features and 2) the time delay associated with detection and actuation of the OPC equipment.
Once the SAT lockout relays isolate the SAT by opening both primary and secondary side breakers, the analysis showed the safety-related undervoltage relaying scheme would automatically separate the engineered safety feature (ESF) busses from the SAT. Subsequently, the Emergency Diesel Generator (EDG) associated with each ESF bus would automatically connect to the ESF bus and allow the ESF loads to be powered from the EDG.
- (4) At the time of this inspection, the licensee had established a functional test schedule which includes testing the relay metering function and verifying relay settings against calculated values. The licensee had not established a periodic setpoint calibration testing schedule to verify relay performance is within the tolerances assumed within the supporting analyses. The licensees relay testing procedure for microprocessor-based relays does not require calibration or setpoint verification.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
DOCUMENTS REVIEWED
Inspection Type Designation Description or Title Revision or
Procedure Date
2515/194 Calculations L-003750 LaSalle Offsite Power System Open Phase EMPT Evaluation 001
L-003786 Unit 1 and Unit 2 Loss of Phase Detection Relay Settings 003
L-003885 Open Phase Detection LOCA Analysis 1
Corrective Action 04284977 NRC IDD Procedure Enhancement 10/04/2019
Documents
Resulting from
Inspection
Drawings 1E-1-4000FC Key Diagram Essential Div. 2 125V DC Distribution Panel P
2X (1DC12E) and Panel 112Y (1DC13E)
1E-1-4004AG Schematic Diagram Main Power System MP Part 7 K
1E-1-4005DQ Schematic Diagram Auxiliary Power System AP Part 87 M
1E-2-4000A Single Line Diagram Generator, Transformers & 6900V V
Buses Part 1
1E-2-4000NF Relaying & Metering Diagram System Auxiliary G
Transforme242 (2AP91E)
Engineering 387695 Single Phase Fault Mitigation 000
Changes
Procedures LOA-AP-101 Unit 1, AC Power System Abnormal 59
LOR-1PM01J- Sat 142(242) System 1 Prot Relay Trip 3
A117
LOR-1PM01J- Sat 142 Low Load 3
A405
LOR-242 Loss of Sat 242 Loss of Phase Relay Trouble 4
Phase Relay
Trouble
LOR-2PM01J- SAT 242 System 2 Prot Relay Trip 3
A217
LST-2013-040 Single Phase Fault Mitigation Relay (EC 387695) 0
LST-2015-009 Open Phase Condition Concurrent with a LOCA Bus Transfer 0
Logic Change (EC 400355)
MA-LA-773-231 Unit 1, System Aux Transformer Relay and Meter 8
Calibrations By OAD
Inspection Type Designation Description or Title Revision or
Procedure Date
Work Orders 01513170 OAD Perform Bench Testing of Relay SEL-451 Per 12
EC387696
7