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Category:Inspection Report
MONTHYEARIR 05000336/20234022024-01-30030 January 2024 Security Baseline Inspection Report 05000336/2023402 and 05000423/2023402 (Cover Letter Only) IR 05000336/20234402024-01-11011 January 2024 Special Inspection Report 05000336/2023440 and 05000423/2023440 (Cover Letter Only) IR 05000336/20230032023-11-0606 November 2023 Integrated Inspection Report 05000336/2023003 and 05000423/2023003 IR 05000336/20234202023-10-0404 October 2023 Security Inspection Report 05000336/2023420 and 05000423/2023420 IR 05000245/20230012023-09-19019 September 2023 Safstor Inspection Report 05000245/2023001 IR 05000336/20230102023-09-0808 September 2023 Commercial Grade Dedication Report 05000336/2023010 and 05000423/2023010 IR 05000336/20230052023-08-31031 August 2023 Updated Inspection Plan for Millstone Power Station, Units 2 and 3 (Report 05000336/2023005 and 05000423/2023005) IR 05000336/20230022023-08-0909 August 2023 Integrated Inspection Report 05000336/2023002 and 05000423/2023002 IR 05000336/20234012023-07-17017 July 2023 Material Control and Accounting Program Inspection Report 05000336/2023401 and 05000423/2023401 - (Cover Letter Only) IR 07200047/20234012023-06-0808 June 2023 NRC Independent Spent Fuel Storage Installation Security Inspection Report No. 07200047/2023401 IR 05000336/20230012023-05-0808 May 2023 Integrated Inspection Report 05000336/2023001 and 05000423/2023001 IR 05000336/20234032023-05-0202 May 2023 Public - Millstone Power Station, Units 2 and 3 Final Significance Determination of Green Finding; Inspection Report 05000336/2023403 and 05000423/2023403 IR 05000336/20233022023-03-0707 March 2023 Operator Licensing Retake Examination Report 05000336/2023302 IR 05000336/20220062023-03-0101 March 2023 Annual Assessment Letter for Millstone Power Station, Units 2 and 3 (Reports 05000336/2022006 and 05000423/2022006) IR 05000336/20220042023-02-13013 February 2023 Integrated Inspection Report 05000336/2022004 and 05000423/2022004 IR 05000336/20224012023-01-26026 January 2023 Security Baseline Inspection Report 05000336/2022401 and 05000423/2022401 and Preliminary Finding(S) of Greater than Very Low Significance and Apparent Violation(S) (Cover Letter Only) IR 05000245/20220012023-01-0909 January 2023 Safstor Inspection Report 05000245/2022001 IR 05000336/20224032023-01-0505 January 2023 Cyber Security Inspection Report 05000336/2022403 and 05000423/2022403 IR 05000336/20225012022-12-14014 December 2022 Reissued Emergency Preparedness Biennial Exercise Inspection Report 05000336/2022501 and 05000423/2022501 IR 05000336/20223012022-11-22022 November 2022 Initial Operator Licensing Examination Report 05000336/2022301 ML22325A1042022-11-21021 November 2022 Emergency Preparedness Biennial Exercise Inspection Report 05000336/2022501 and 05000423/2022501 IR 05000336/20220032022-11-14014 November 2022 Integrated Inspection Report 05000336/2022003 and 05000423/2022003 IR 05000336/20220102022-11-0101 November 2022 Biennial Problem Identification and Resolution Inspection Report 05000336/2022010 and 05000423/2022010 IR 05000336/20220112022-09-0808 September 2022 Triennial Fire Protection Inspection Report 05000336/2022011 and 05000423/2022011 IR 05000336/20220052022-08-31031 August 2022 Updated Inspection Plan for Millstone Power Station, Units 2 and 3 (Report 05000336/2022005 and 05000423/2022005) IR 05000336/20220022022-08-11011 August 2022 Integrated Inspection Report 05000336/2022002 and 05000423/2022002 IR 05000336/20224022022-05-23023 May 2022 Information Request for the Cyber Security Baseline Inspection, Notification to Perform Inspection 05000336/2022402 and 05000423/2022402 IR 05000336/20220012022-05-10010 May 2022 Integrated Inspection Report 05000336/2022001 and 05000423/2022001 IR 05000423/20223022022-03-0707 March 2022 Operator Licensing Retake Examination Report 05000423/2022302 IR 05000336/20210062022-03-0202 March 2022 Annual Assessment Letter for Millstone Power Station, Units 2 and 3 (Reports 05000336/2021006 and 05000423/2021006) IR 05000336/20210042022-02-10010 February 2022 Integrated Inspection Report 05000336/2021004 and 05000423/2021004 IR 05000336/20210112022-01-20020 January 2022 Post-Approval Site Inspection for License Renewal - Phase 4 Inspection Report 05000336/2021011 IR 05000336/20210032021-11-12012 November 2021 Integrated Inspection Report 05000336/2021003 and 05000423/2021003 IR 05000423/20213012021-11-10010 November 2021 Initial Operator Licensing Examination Report 05000423/2021301 IR 05000336/20210052021-09-0101 September 2021 Updated Inspection Plan for the Millstone Power Station, Units 2 and 3 (Report 05000336/2021005 and 05000423/2021005) IR 05000336/20210022021-08-0909 August 2021 Integrated Inspection Report 05000336/2021002 and 05000423/2021002 and Independent Spent Fuel Storage Installation Inspection Report 07200047/2021002 IR 05000245/20210012021-07-26026 July 2021 Safe Storage Inspection Report 05000245/2021001 IR 05000336/20215012021-06-23023 June 2021 Emergency Preparedness Biennial Exercise Inspection Report 05000336/2021501 and 05000423/2021501 IR 05000336/20210102021-05-17017 May 2021 Design Bases Assurance Inspection (Teams) Inspection Report 05000336/2021010 and 05000423/2021010 IR 05000336/20210012021-04-29029 April 2021 Integrated Inspection Report 05000336/2021001 and 05000423/2021001 IR 05000336/20214012021-03-25025 March 2021 Security Baseline Inspection Report 05000336/2021401 and 05000423/2021401 IR 05000336/20210122021-03-17017 March 2021 Temporary Instruction 2515/194 Inspection Report 05000336/2021012 and 05000423/2021012 IR 05000336/20200062021-03-0303 March 2021 Annual Assessment Letter for Millstone Power Station, Units 2 and 3 (Reports 05000336/2020006 and 05000423/2020006) IR 05000336/20200042021-02-0101 February 2021 Integrated Inspection Report 05000336/2020004 and 05000423/2020004 IR 05000336/20200122021-01-14014 January 2021 Biennial Problem Identification and Resolution Inspection Report 05000336/2020012 and 05000423/2020012 IR 05000336/20203012020-11-12012 November 2020 Initial Operator Licensing Examination Report 05000336/2020301 IR 05000336/20200032020-11-0202 November 2020 Integrated Inspection Report 05000336/2020003 and 05000423/2020003 and Independent Spent Fuel Storage Installation Inspection Report 07200047/2020001 IR 05000336/20204012020-10-14014 October 2020 Material Control and Accounting Program Inspection Report 05000336/2020401 and 05000423/2020401 (Cover Letter Only) IR 05000336/20204202020-10-14014 October 2020 Security Inspection Report 05000336/2020420 and 05000423/2020420 IR 05000336/20200052020-08-31031 August 2020 Updated Inspection Plan for Millstone Power Station, Units 2 and 3 (Inspection Report 05000336/2020005 and 05000423/2020005) 2024-01-30
[Table view] Category:Letter
MONTHYEARML24030A7522024-01-30030 January 2024 Technical Specification Bases Pages IR 05000336/20234022024-01-30030 January 2024 Security Baseline Inspection Report 05000336/2023402 and 05000423/2023402 (Cover Letter Only) ML23341A0172024-01-12012 January 2024 Issuance of Amendment No. 288 Revision to Applicability Term for Reactor Coolant System Heatup and Cooldown Pressure-Temperature Limitations Figures IR 05000336/20234402024-01-11011 January 2024 Special Inspection Report 05000336/2023440 and 05000423/2023440 (Cover Letter Only) ML24004A1052024-01-0404 January 2024 Request for Information for a Biennial Problem Identification and Resolution Inspection; Inspection Report 05000336/2024010 & 05000423/2024010 ML23361A0942023-12-21021 December 2023 Response to Request for Additional Information Regarding Proposed License Amendment Request to Revise Technical Specifications for Reactor Core Safety Limits, Fuel Assemblies and Core Operating Limits Report . ML23283A3052023-12-20020 December 2023 Review of Appendix F to DOM-NAF2, Qualification of the Framatome ORFEO-GAIA and ORFEO-NMGRID CHF Correlations in the Dominion Energy VIPRE-D Computer Code (EPID L-2022-LLT-0003) (Nonproprietary) ML23361A0312023-12-20020 December 2023 Intent to Pursue Subsequent License Renewal ML23352A0202023-12-18018 December 2023 Senior Reactor and Reactor Operator Initial License Examinations ML23334A2242023-11-30030 November 2023 Request for Exemption from Enhanced Weapons Firearms Background Checks, and Security Event Notifications Implementation ML23324A4222023-11-20020 November 2023 Reactor Vessel Internals Inspections Aging Management Program Submittal Related to License Renewal Commitment 13 ML23324A4302023-11-20020 November 2023 Alloy 600 Aging Management Program Submittal Related to License Renewal Commitment 15 ML23317A2702023-11-13013 November 2023 Core Operating Limits Report, Cycle 23 IR 05000336/20230032023-11-0606 November 2023 Integrated Inspection Report 05000336/2023003 and 05000423/2023003 ML23298A1652023-10-26026 October 2023 Requalification Program Inspection IR 05000336/20234202023-10-0404 October 2023 Security Inspection Report 05000336/2023420 and 05000423/2023420 ML23230A0502023-10-0202 October 2023 5 of the Quality Assurance Topical Report - Review of Program Changes ML23226A0052023-09-26026 September 2023 Issuance of Amendment No. 287 Supplement to Spent Fuel Pool Criticality Safety Analysis IR 05000245/20230012023-09-19019 September 2023 Safstor Inspection Report 05000245/2023001 IR 05000336/20230102023-09-0808 September 2023 Commercial Grade Dedication Report 05000336/2023010 and 05000423/2023010 IR 05000336/20230052023-08-31031 August 2023 Updated Inspection Plan for Millstone Power Station, Units 2 and 3 (Report 05000336/2023005 and 05000423/2023005) ML23248A2132023-08-30030 August 2023 Response to Request for Additional Information Regarding Proposed License Amendment Request to Revise the Applicability Term for Reactor Coolant System Heatup and Cooldown Pressure-Temperature. ML23242A0142023-08-30030 August 2023 Operator Licensing Examination Approval ML23223A0552023-08-18018 August 2023 Request for Withholding Information from Public Disclosure for License Amendment Request to Revise Technical Specifications for Reactor Core Safety Limits, Fuel Assemblies, and COLR Related to Framatome Gaia Fuel ML23223A0482023-08-18018 August 2023 Request for Withholding Information from Public Disclosure for License Amendment Request to Use Framatome Small Break and Realistic Large Break LOCA Evaluation Methodologies for Establishing COLR Limits IR 05000336/20230022023-08-0909 August 2023 Integrated Inspection Report 05000336/2023002 and 05000423/2023002 ML23188A0432023-07-31031 July 2023 Authorization and Safety Evaluation for Alternative Request No. IR-04-11 ML23208A0922023-07-26026 July 2023 Request for Approval of Appendix F of Fleet Report DOM-NAF-2-P Qualification of Framatome ORFEO-GAIA and OORFE-NMGRID CHF Correlations in the Dominion Energy Vipre-D Computer Code Response ML23188A0202023-07-26026 July 2023 Closeout of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors ML23207A1102023-07-26026 July 2023 NRC Regulatory Issues Summary 2023-01 Preparation and Scheduling of Operator Licensing Examinations IR 05000336/20234012023-07-17017 July 2023 Material Control and Accounting Program Inspection Report 05000336/2023401 and 05000423/2023401 - (Cover Letter Only) ML23175A0052023-07-12012 July 2023 Alternative Request P-07 for Pump Periodic Verification Testing Program for Containment Recirculation Spray System Pumps ML23193A8562023-06-28028 June 2023 Submittal of Updates to the Final Safety Analysis Reports ML23178A1682023-06-26026 June 2023 2022 Annual Report of Emergency Core Cooling System (ECCS) Model Changes Pursuant to the Requirements of 10 CFR 50.46 ML23153A1732023-06-16016 June 2023 Correction to Amendment Nos. 346 & 286 Millstone, 294 & 277 North Anna, 311 & 311 Surry, and 225 Summer to Revise Technical Specifications to Adopt TSTF-554,Rev Reactor Coolant Leakage Requirement ML23151A0742023-06-12012 June 2023 Review of the Spring 2022 Steam Generator Tube Inspection Report ML23159A2202023-06-0808 June 2023 Associated Independent Spent Fuel Storage Installation Revision to Emergence Plan - Report of Changes IR 07200047/20234012023-06-0808 June 2023 NRC Independent Spent Fuel Storage Installation Security Inspection Report No. 07200047/2023401 2024-01-04
[Table view] |
Text
March 20, 2020
SUBJECT:
MILLSTONE POWER STATION, UNITS 2 AND 3 - TEMPORARY INSTRUCTION 2515/194 INSPECTION REPORT 05000336/2020010 AND 05000423/2020010
Dear Mr. Stoddard:
On March 5, 2020, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Millstone Power Station, Units 2 and 3 and discussed the results of this inspection with John Daugherty, Site Vice President and other members of your staff. The results of this inspection are documented in the enclosed report.
No findings or violations of more than minor significance were identified during this inspection.
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 Title 10 of the Code of Federal Regulations 2.390, Public Inspections, Exemptions, Requests for Withholding.
Sincerely, X /RA/
Signed by: Glenn T. Dentel Glenn T. Dentel, Chief Engineering Branch 2 Division of Reactor Safety Docket Nos. 05000336 and 05000423 License Nos. DPR-65 and NPF-49
Enclosure:
As stated
Inspection Report
Docket Numbers: 05000336 and 05000423 License Numbers: DPR-65 and NPF-49 Report Numbers: 05000336/2020010 and 05000423/2020010 Enterprise Identifier: I-2020-010-0015 Licensee: Dominion Energy Nuclear Connecticut, Inc.
Facility: Millstone Power Station, Units 2 and 3 Location: P.O. Box 128 Waterford, CT 06385 Inspection Dates: March 3, 2020 to March 5, 2020 Inspectors: L. Dumont, Reactor Inspector B. Pinson, Reactor Inspector Approved By: Glenn T. Dentel, Chief Engineering Branch 2 Division of Reactor Safety Enclosure
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a Temporary Instruction 2515/194 Inspection at Millstone Power Station, Units 2 and 3, 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
The inspection was conducted using Temporary Instruction 2515/194 (ADAMS Accession No. ML17137A416), effective November 1, 2017. The inspectors reviewed the licensees implementation of the Nuclear Energy Institutes voluntary industry initiative in compliance with Commission guidance. The inspectors discussed Millstones open phase condition system design and ongoing implementation plans with plant staff. The inspectors reviewed licensee and vendor documentation, and performed system walkdowns to verify that the installed equipment was supported by the design documentation.
OTHER ACTIVITIES
- TEMPORARY INSTRUCTIONS, INFREQUENT AND ABNORMAL 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)
The inspectors reviewed the licensees implementation of the Nuclear Energy Institute Voluntary Industry Initiative, (ADAMS Accession No. ML15075A454) dated March 16, 2015. This included reviewing how the licensee updated their licensing basis to reflect the need to protect against open phase conditions.
Inspection of the Licensees Implementation of Industry Initiative Associated with the Open Phase Condition Design Vulnerabilities In Electric Power Systems (NRC Bulletin 2012-01)
(1 Sample)
- (1) Dominion Energy Nuclear Connecticut, Inc., selected the open phase detection system designed and manufactured by Power System Sentinel Technologies, LLC, (PSSTech) as the design vendor for the open phase condition (OPC) system at Millstone Power Station. The open phase protection system is designed to protect the offsite power sources from a loss of phase condition.
The offsite electrical distribution system is functionally the same for both Millstone Unit 2 (MP2) and Unit 3 (MP3). At each unit the offsite power system includes the transmission system and the 345-kV switchyard. Included in the system are main generator step-up transformers (GSUs) and the reserve station service transformers (RSSTs) of both MP2 and MP3.
At the end of the inspection, the PSSTechs were in the "Detect" mode of operation.
The trip function was bypassed and will remain disabled on MP2 transformers, and will not be installed on the MP3 transformers. Dominion Energy Nuclear Connecticut, Inc. plans to pursue an alternate implementation method (i.e. risk based with manual actions) for Unit 2 and Unit 3 to comply with the open phase detection initiative.
INSPECTION RESULTS
Temporary Instruction 2515/194-03.01 - Voluntary Industry Initiative 2515/194 Based on discussions with licensee staff, review of design and testing documentation, and walkdowns of installed equipment, the inspectors had reasonable assurance that the licensee is appropriately implementing, with noted exceptions discussed below, the voluntary industry initiative at Millstone Power Station, Units 2 and 3. The inspectors determined that:
Detection, Alarms, and General Criteria
1. 03.01(a)(1) OPCs are detected and alarmed in the control room for MP2 and MP3.
2. 03.01(a)(2) Detection circuits are sensitive enough to identify an OPC for credited loading
conditions (i.e., high and low loading).
3. 03.01(a)(3) OPC design and protective schemes minimize misoperation or spurious action
in the range of voltage unbalance normally expected in the transmission system that could cause separation from an operable off-site power source. In the design of the OPC system, multiple features have been added to prevent spurious trips of the system. Dominion Energy solutions demonstrated that the actuation circuit design does not result in lower overall plant operation reliability.
4. 03.01(a)(4) No class 1E circuits were replaced with non class 1E circuits during installation
of the open phase detection system.
Protective Actions Criteria
1. 03.01(b)(1) An OPC detection system was installed on the high voltage side of the MP2
GSU transformer and the MP2 RSST. Additionally, an OPC detection system was installed on the MP3 GSU transformer and the MP3 RSST "A" to mitigate the effects of an OPC.
2. 03.01(b)(2) With an OPC present and no accident condition signal, the open phase design
would not adversely affect the function of important-to-safety systems, structures, or components. The licensees OPC design solution added three PSSTech systems on the high side of the MP2 GSU and RSST and the MP3 GSU and RSST. The credited plant response was unaffected and would be the same regardless of the conditions that generated the lockout of the transformer.
No findings were identified.
Detection, Alarms, and General Criteria Exceptions 2515/194 03.01(a)(5) Neither MP2 and MP3 UFSAR were updated at the time of the inspection to describe the design features of the OPC detection system. This was documented in CR-1142660 and was identified during the self-assessment conducted prior to the start of the inspection under PIR1135211. The licensee provided to the inspectors the proposed changes to the licensing basis that discussed the system requirements related to the effects of, and protection for, any OPC design vulnerability.
Protective Actions Exceptions 2515/194 03.01(b)(3) The inspectors determined that with an OPC and an accident condition signal present, the open phase detection system would not adversely affect the function of the load shedding and sequencing system to provide a means of disconnecting and sequencing of loads on the safety related buses. The open phase protection trip circuit was installed on MP2 transformers; however, the trip function was bypassed and will remain disabled on MP2 transformers, and will not be installed on the MP3 transformers as a result of the licensee deciding to implement the risk informed guidance of NEI 19-02, Revision 3. As such, the OPC equipment on both units were not placed in the trip mode of operation.
03.01(b)(4) At the time of this inspection, the licensee had not established documentation for periodic tests, calibrations, setpoint verifications, or inspection procedures associated with the PSSTech equipment.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On March 5, 2020, the inspectors presented the Temporary Instruction 2515/194 Inspection results to John Daugherty, Site Vice President and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection Type Designation Description or Title Revision or
Procedure Date
2515/194 Calculations MP2-ENG-EMTP- MP2 Open Phase Condition Modeling Analysis 1
04446E2
MP2-ENG-EMTP- MP2 Open Phase Condition EMTP Time Delay Limit Analysis
04447E2
MP3-ENG-EMTP- MP3 Open Phase Condition Time Delay Limit Analysis 1
04547E3
MP3-ENG-EMTP- MP3 Open Phase Condition Modeling and Analysis 1
04548E3
Corrective Action CR1136741
Documents CR1136786
CR1142281
CR1142285
CR1142530
Corrective Action CR1142660
Documents
Resulting from
Inspection
Drawings 1700156-E- Generator Transformer (15G-2U) Final Trip & Coast Down 0
203-32005
1700156-E- Generator Transformer (15G-2U) Final Trip and Generator 1
20332005-B Coast Down
203-30001 Main Single Line Diagram 48
212-30001 Main One Line / Phasing Diagram PWR Distr Sys Composite 27
Engineering MP2-17-00156 MP2 Open Phase Condition Detection System (Protection 5
Changes Phase)
MP3-17-00157 MP3 Open Phase Condition Detection System (Protection 4
Phase)
Miscellaneous Open Phase Protection System Unit 3 GSU Online 12/12/2017
Commissioning Test
Unit 3 Plant Equipment Round - Outside 2/28/2020 -
3/3/2020
Millstone Switchyard Inspection 2/21/2020
Inspection Type Designation Description or Title Revision or
Procedure Date
Unit 2 Outside Rounds 2/28/2020 -
3/3/2020
Open Phase Protection System Unit 3 RSST Online 12/12/2017
Commissioning Test
Unit 2 Control 2/28/2020
Room Weekly
Checks
Unit 3 Mode 1-4 2/29/2020
Weekly Control
Room Rounds
Procedures 1-8 RSST Open Phase 014
2-1 Main XFMR Open Phase 016
3-9 RSST Open Phase Sys Trouble 014
5-1 Main XFMR Phase Sys Trouble 016
BA-47 Main XFMR Open Phase 003
BB-47 Main XFRM Open Phase Sys Trouble 002
CA-48 RSST Open Phase 003
CB-48 RSST Open Phase Sys Trouble 001
7