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MONTHYEARML0110602362002-08-0707 August 2002 Request for Relief to Use Mechanical Nozzle Seal Assemblies (Tac Nos. MB0557 and MB0558) Project stage: Acceptance Review ML0402002412004-01-14014 January 2004 Application of Mechanical Nozzle Seal Assemblies to Pressurizer Heater Sleeves Project stage: Other ML0806702242008-03-21021 March 2008 Clarification of Staff Approval to Implement Mechanical Nozzle Seal Assemblies at Calvert Cliffs Nuclear Power Plant Unit Nos. 1 and 2 (TAC Nos. MB0557 and MB0558) Project stage: Other 2004-01-14
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Category:Letter
MONTHYEARIR 05000317/20230042024-02-0101 February 2024 Integrated Inspection Report 05000317/2023004 and 05000318/2023004 ML24029A0102024-01-29029 January 2024 Request for Information and Notification of Conduct of IP 71111.21.N.04, Age-Related Degradation, Reference Inspection Report 05000317/2024010 and 05000318/2024010 ML24003A8872024-01-19019 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0033 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) 05000318/LER-2023-004, Submittal of LER 2023-004-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Submittal of Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer2024-01-16016 January 2024 Submittal of LER 2023-004-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Submittal of Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer ML24011A0732024-01-11011 January 2024 Proposed Alternative to the Requirements for Repair/Replacement of Saltwater (SW) System Buried Piping 05000318/LER-2023-002, Forward LER 2023-002-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer2024-01-0808 January 2024 Forward LER 2023-002-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer 05000318/LER-2023-003, Forward LER 2023-003-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Manual Actuation of Auxiliary Feedwater System Due to 22 Steam Generator Feedwater Pump Trip2024-01-0808 January 2024 Forward LER 2023-003-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Manual Actuation of Auxiliary Feedwater System Due to 22 Steam Generator Feedwater Pump Trip ML24005A0222024-01-0505 January 2024 Revised Steam Generator Tube Inspection Reports ML23304A0642024-01-0202 January 2024 Issuance of Amendment No. 349 to Modify the Long-Term Coupon Surveillance Program RS-23-125, Request for Exemption from 10 CFR 2.109(b)2023-12-0707 December 2023 Request for Exemption from 10 CFR 2.109(b) ML23331A2992023-11-27027 November 2023 Submittal of Condition Prohibited by Technical Specifications Due to Failure to Sample Diesel Generator Fuel Oil Storage Tank IR 05000317/20230102023-11-20020 November 2023 Biennial Problem Identification and Resolution Inspection Report 05000317/2023010 and 05000318/2023010 ML23318A4722023-11-14014 November 2023 Supplement to License Amendment Request to Adopt TSTF-59-A ML23317A1032023-11-10010 November 2023 Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information ML23317A1192023-11-10010 November 2023 Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums ML23310A0442023-11-0707 November 2023 Project Manager Assignment IR 05000317/20230402023-11-0202 November 2023 95001 Supplemental Inspection Report 05000317/2023040 and Follow-Up Assessment Letter IR 05000317/20230032023-11-0101 November 2023 Integrated Inspection Report 05000317/2023003 and 05000318/2023003 IR 05000317/20230902023-10-26026 October 2023 Final Significance Determination of a White Finding with Assessment Follow-Up and Notice of Violation; Inspection Report 05000317/2023090 ML23289A1202023-10-16016 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 RS-23-108, Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator Pressure Retaining Welds and Full Penetration Welded Nozzles2023-10-11011 October 2023 Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator Pressure Retaining Welds and Full Penetration Welded Nozzles RS-23-105, Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds and Nozzle Inside Radius Sections2023-10-10010 October 2023 Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds and Nozzle Inside Radius Sections ML23279A1202023-10-0606 October 2023 Response to NRC Inspection Report and Preliminary White Finding IR 05000317/20230502023-09-29029 September 2023 Special Inspection Report 05000317/2023050 and Preliminary White Finding and Apparent Violation ML23272A1032023-09-29029 September 2023 Condition Prohibited by Technical Specifications Due to Inoperable Nuclear Instrumentation at Very Low Power IR 05000317/20234012023-09-18018 September 2023 Cyber Security Inspection Report 05000317/2023401 and 05000318/2023401 ML23254A0012023-09-0505 September 2023 Registration of Use of Casks to Store Spent Fuel IR 05000317/20230052023-08-31031 August 2023 Updated Inspection Plan for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Report 05000317/2023005 and 05000318/2023005) ML23158A1952023-08-30030 August 2023 R. E. Ginna - Issuance of Amendments to Adopt TSTF-273-A, Revision 2, Safety Function Determination Program Clarifications ML23241A8412023-08-29029 August 2023 Response to Request for Additional Information - Proposed Alternative to the Requirements for Repair/Replacement of Saltwater (SW) System Buried Piping ML23240A3872023-08-28028 August 2023 Senior Reactor and Reactor Operator Initial License Examinations ML23151A3472023-08-21021 August 2023 Issuance of Amendments to Adopt TSTF-295-A, Modify Note 2 to Actions of PAM Table to Allow Separate Condition Entry for Each Penetration ML23219A1662023-08-16016 August 2023 Request for Additional Information Regarding Proposed Alternative to the Requirements for Repair/Replacement of Saltwater (SW) System Buried Piping (EPID: L-2023-LLR-0006) - Non-proprietary ML23228A1002023-08-15015 August 2023 Notification of Readiness for NRC 95001 Inspection ML23188A0402023-08-0808 August 2023 Issuance of Amendment Nos. 346 and 324 Adoption of TSTF-577, Revised Frequencies for Steam Generator Tube Inspections, Revision 1 ML23214A1572023-08-0707 August 2023 Correction to the Renewed Facility Operating License Page 3 in Amendment No 345 IR 05000317/20230022023-08-0303 August 2023 Integrated Inspection Report 05000317/2023002 ML23188A0512023-07-13013 July 2023 Correction to the Renewed Facility Operating License Pages in Amendment Nos. 336 and 314 ML23186A0372023-07-13013 July 2023 Correction to the Renewed Facility Operating License Pages in Amendment Nos. 340 and 318 IR 05000317/20233012023-07-12012 July 2023 Initial Operator Licensing Examination Report 05000317/2023301 and 05000318/2023301 IR 05000317/20230122023-07-10010 July 2023 Commercial Grade Dedication Report 05000317/2023012 and 05000318/2023012 ML23180A2362023-06-29029 June 2023 Correction of Errors on Technical Specification Pages RS-23-083, Withdrawal - Proposed Alternatives Related to the Steam Generators2023-06-27027 June 2023 Withdrawal - Proposed Alternatives Related to the Steam Generators ML23156A6752023-06-20020 June 2023 Request for Withholding Information from Public Disclosure for Proposed Alternative to the Requirements for Repair/Replacement of Saltwater System Buried Piping 2024-02-01
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March 21, 2008 Mr. James A. Spina, Vice President Calvert Cliffs Nuclear Power Plant, Inc.
Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702
SUBJECT:
CLARIFICATION OF STAFF APPROVAL TO IMPLEMENT MECHANICAL NOZZLE SEAL ASSEMBLIES AT CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 (TAC NOS. MB0557 AND MB0558)
Dear Mr. Spina:
By letter dated August 7, 2002 (Agencywide Documents Access Management System (ADAMS)
Accession No. ML011060236), and pursuant to Title 10 of the Code of Federal Regulations, Section 50.55a(a)(3)(i), the Nuclear Regulatory Commission (NRC) approved the use of mechanical nozzle seal assembly (MNSA) devices as an acceptable alternative to the requirements of Section XI of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code. Recent developments have demonstrated that clarification to the NRCs safety evaluation (SE) supporting this approval is desirable.
The NRC staffs SE did not include specific details regarding the intended applications of the MNSA devices. Rather, the SE simply concluded that the installation of MNSA devices was acceptable as a temporary alternative repair method for cracked Alloy 600 instrumentation and sampling nozzles in the Calvert Cliffs reactor coolant pressure boundary for up to two operating cycles. At the time of the submittal, the licensee did not have a specific need to install an MNSA device and was only requesting prior NRC approval in the event that a need would occur.
During the February 2008 refueling outage at Calvert Cliffs Unit 1, the licensee observed boric acid crystals emanating from a cracked Alloy 600 pressurizer heater sleeve penetration. The licensee decided to install an MNSA device on this line citing prior NRC approval in the above SE. Due to the lack of specificity in the staffs SE, questions were raised regarding the intended scope of applicability and whether MNSA devices should be limited to instrumentation and sampling nozzles as cited in the staffs SE.
The licensees submittal identified six MNSA designs intended for use at Calvert Cliffs. These six applications, which were identified in proprietary Enclosure 4 to the licensees letter dated November 17, 2000 (ADAMS Accession No. ML003770894, page 172 of 434), and in the non-proprietary Attachment 1 to the licensees letter dated March 14, 2001 (ADAMS Accession No. ML010780260), include:
- Hot Leg Resistance Temperature Detector (RTD) Nozzle
- Hot Leg Pressure Differential Transmitter or Sampling Nozzle
- Pressurizer Heater Sleeve Nozzle
- Upper Pressurizer Instrument Nozzle
- Side Pressurizer RTD Nozzle
- Bottom Pressurizer Instrument Nozzle
J. Spina Based upon internal discussions and a re-examination of our original SE, we concur with expanding the scope of the original SE, as intended by the licensees submittal, to include the six intended designs identified above. Our failure to address the specific applications in the SE was an oversight. There is no technical justification to exclude the use of the MNSAs on the pressurizer heater sleeves as opposed to limiting their use to instrumentation and sampling nozzles.
Please contact me at 301-415-1364 if you have any questions.
Sincerely,
/RA/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318 cc: See next page
ML080670224 OFFICE LPL1-1/PM LPL1-1/LA CVIB/BC LPL1-1/BC NAME DPickett SLittle MMitchell MKowal 3/19/08 3/19/08 3/20/08 3/21/08 DATE Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 cc:
Mr. Michael J. Wallace, President Ms. Kristen A. Burger, Esquire Constellation Energy Nuclear Group, LLC Maryland People's Counsel 750 East Pratt Street, 18th Floor 6 St. Paul Centre Baltimore, MD 21202 Suite 2102 Baltimore, MD 21202-1631 Mr. John M. Heffley, Senior Vice President and Chief Nuclear Officer Ms. Patricia T. Birnie, Esquire Constellation Energy Nuclear Generation Co-Director Group Maryland Safe Energy Coalition 111 Market Place P.O. Box 33111 Baltimore, MD 21202 Baltimore, MD 21218 President Mr. Roy Hickok Calvert County Board of NRC Technical Training Center Commissioners 5700 Brainerd Road 175 Main Street Chattanooga, TN 37411-4017 Prince Frederick, MD 20678 Mr. Louis S. Larragoite Mr. Carey Fleming, Esquire Manager - Nuclear Licensing Sr. Counsel - Nuclear Generation Constellation Energy Nuclear Generation Constellation Energy Nuclear Group, LLC Group 750 East Pratt Street, 17th floor 111 Market Place, 2nd Floor Baltimore, MD 21202 Baltimore, MD 21202 Mr. Jay S. Gaines Director, Licensing Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702 Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 287 St. Leonard, MD 20685 Mr. R. I. McLean, Manager Nuclear Programs Power Plant Research Program Maryland Department of Natural Resources 580 Taylor Avenue (B wing, 3rd floor)
Tawes State Office Building Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406