ML080740325: Difference between revisions
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{{#Wiki_filter:March 14, 2008 | {{#Wiki_filter:March 14, 2008 Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 | ||
Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 | |||
==SUBJECT:== | ==SUBJECT:== | ||
BRAIDWOOD STATION, UNIT 2 - EVALUATION OF NEW INFORMATION RELATED TO ALLOY 82/182 PRESSURIZER BUT WELD INSPECTIONS RE: | BRAIDWOOD STATION, UNIT 2 - EVALUATION OF NEW INFORMATION RELATED TO ALLOY 82/182 PRESSURIZER BUT WELD INSPECTIONS RE: | ||
CONFIRMATORY ACTION LETTER NRR-07-008 (TAC NO. MD7295) | |||
==Dear Mr. Pardee:== | ==Dear Mr. Pardee:== | ||
On March 22, 2007, the U.S. Nuclear Regulatory Commission (NRC) issued Confirmatory Action Letter (CAL) No. NRR-07-008 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML070740294) regarding dissimilar metal welds in the pressurizer surge, spray, and safety/relief nozzle-to-safe end welds at Braidwood Station (Braidwood), Unit 2 . The CAL and the supporting commitment letter (ADAMS Accession No. ML070520499) indicate that inspection and mitigation actions may be conducted during your spring 2008 refueling outage, contingent on the industry providing an analysis that demonstrates an acceptable level of safety to the NRC for the operation of these welds until the spring of 2008. | On March 22, 2007, the U.S. Nuclear Regulatory Commission (NRC) issued Confirmatory Action Letter (CAL) No. NRR-07-008 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML070740294) regarding dissimilar metal welds in the pressurizer surge, spray, and safety/relief nozzle-to-safe end welds at Braidwood Station (Braidwood), Unit 2 . The CAL and the supporting commitment letter (ADAMS Accession No. ML070520499) indicate that inspection and mitigation actions may be conducted during your spring 2008 refueling outage, contingent on the industry providing an analysis that demonstrates an acceptable level of safety to the NRC for the operation of these welds until the spring of 2008. | ||
The NRC received MRP-216, Rev. 1, Materials Reliability Program: Advanced FEA [Finite Element Analysis] Evaluation of Growth of Postulated Circumferential PWSCC [Primary Water Stress-Corrosion Cracking] Flaws in Pressurizer Nozzle Dissimilar Metal Welds, on August 13, 2007 (ADAMS Accession No. ML072410235). Based on our review of this report, NRC concluded that the analysis provided adequate justification to permit inspections during your spring 2008 refueling outage, and that the analysis was applicable to Braidwood, Unit 2. On September 7, 2007, the NRC issued a letter to Exelon Generation Company, LLC (ADAMS Accession No. ML072430292), informing you that a plant shutdown by December 31, 2007, was no longer needed and Braidwood, Unit 2 could continue to operate until the spring 2008 outage. | |||
The NRC received MRP-216, Rev. 1, | On March 4, 2008, the NRC became aware of emerging information regarding certain welds in nozzles on a retired pressurizer from a pressurized-water reactor facility. This was related to new reports (ADAMS Accession Nos. ML080701017 and ML080701020) on weld examinations of those nozzles. This information raised questions regarding the technical basis for the September 7, 2007, letter. The NRC dispatched technical experts in non-destructive examination to independently review industry analyses and actions regarding this matter. On March 13, 2008, a public meeting was held in NRC Headquarters, Rockville, MD, with representatives of the eight licensees whose plants had not yet shut down for spring 2008 outages and who are subject to commitments to inspect or mitigate similar welds during spring 2008 outages. | ||
On March 4, 2008, the NRC became aware of emerging information regarding certain welds in nozzles on a retired pressurizer from a pressurized-water reactor facility. This was related to new reports (ADAMS Accession Nos. ML080701017 and ML080701020) on weld examinations of those nozzles. This information raised questions regarding the technical basis for the September 7, 2007, letter. The NRC dispatched technical experts in non-destructive examination to independently review industry analyses and actions regarding this matter. On March 13, 2008, a public meeting was held in NRC Headquarters, Rockville, MD, with representatives of the eight licensees whose plants had not yet shut down for spring 2008 outages and who are subject to commitments to inspect or mitigate similar welds during spring 2008 outages | |||
C. Pardee The NRC has evaluated the non-destructive automated phased array ultrasonic examination performed since March 4, 2008, and concluded there is reasonable assurance that there is no structurally significant service-related degradation in those nozzles that would alter the conclusions provided in our letter dated September 7, 2007, that allowed continued operation of Braidwood, Unit 2 until the spring 2008 refueling outage. The NRC will continue to evaluate new information as it becomes available. All other requirements of the CAL and the supporting commitment letter regarding enhanced inspection and leakage monitoring requirements for the reactor coolant system and associated reports remain valid. | |||
The CAL will remain open until all CAL commitments pertaining to Braidwood, Unit 2 are complete. | The CAL will remain open until all CAL commitments pertaining to Braidwood, Unit 2 are complete. | ||
Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at http://www.nrc.gov/about-nrc/regulatory/enforcement.html (click on Enforcement Policy or Enforcement Guidance) or by contacting the Government Printing Office (GPO) toll-free at 1-888-293-6498. The GPO is open from 7:00 a.m. to 9:00 p.m. EST, Monday through Friday (except Federal holidays). | Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at http://www.nrc.gov/about-nrc/regulatory/enforcement.html (click on Enforcement Policy or Enforcement Guidance) or by contacting the Government Printing Office (GPO) toll-free at 1-888-293-6498. The GPO is open from 7:00 a.m. to 9:00 p.m. EST, Monday through Friday (except Federal holidays). | ||
In accordance with Title 10 of the Code of Federal Regulations, Part 2, Section 390, of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the | In accordance with Title 10 of the Code of Federal Regulations, Part 2, Section 390, of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the NRCs document system (ADAMS), | ||
/RA by Tim McGinty for/ | accessible from the NRC Web site at http://www.nrc.gov/reading-rm.html. | ||
Catherine Haney, Director | Sincerely, | ||
/RA by Tim McGinty for/ | |||
Catherine Haney, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-457 cc: See next page | |||
C. Pardee The NRC has evaluated the non-destructive automated phased array ultrasonic examination performed since March 4, 2008, and concluded there is reasonable assurance that there is no detectable structurally significant operational degradation in those nozzles that would alter the conclusions provided in our letter dated September 7, 2007, that allowed continued operation of Braidwood, Unit 2 until the spring 2008 refueling outage. The NRC will continue to evaluate new information as it becomes available. All other requirements of the CAL and the supporting commitment letter regarding enhanced inspection and leakage monitoring requirements for the reactor coolant system and associated reports remain valid. | |||
The CAL will remain open until all CAL commitments pertaining to Braidwood, Unit 2 are complete. | The CAL will remain open until all CAL commitments pertaining to Braidwood, Unit 2 are complete. | ||
Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at | Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at http://www.nrc.gov/about-nrc/regulatory/enforcement.html (click on Enforcement Policy or Enforcement Guidance) or by contacting the Government Printing Office (GPO) toll-free at 1-888-293-6498. The GPO is open from 7:00 a.m. to 9:00 p.m. EST, Monday through Friday (except Federal holidays). | ||
In accordance with Title 10 of the Code of Federal Regulations, Part 2, Section 390, of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the | In accordance with Title 10 of the Code of Federal Regulations, Part 2, Section 390, of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the NRCs document system (ADAMS), | ||
/RA by Tim McGinty for/ | accessible from the NRC Web site at http://www.nrc.gov/reading-rm.html. | ||
Catherine Haney, Director | Sincerely, | ||
/RA by Tim McGinty for/ | |||
Catherine Haney, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-457 cc: See next page DISTRIBUTION: | |||
ADAMS Accession No. ML080740325 | PUBLIC RidsNrrDirs RidsOEMailCenter LPL3-2 R/F RidsNrrDorl RidsOgcRp RidsAcrsAcnw&mMailCenter RidsNrrDorlLpl3-2 RidsRgn3MailCenter RidsEdoMailCenter RidsNrrLAJBurkhardt RLickus, R-III SLO RidsNrrOd RidsNrrLAEWhitt MWidman, EDO R-III RidsNrrDci RidsNrrPMMMarkley RJStrasma, OPA R-III RidsNrrDciCpnb RidsNrrPMMDavid ESullivan, NRR/DCI/CPNB ADAMS Accession No. ML080740325 (*) by e-mail (**) see previous concurrence NRR-106 OFFICE DCI/CPNB DCI/CPNB/BC DORL/LPL3-2/PM DORL/LPL4/LA NAME TSullivan TChan MDavid, CG for JBurkhardt DATE 3/14/08, w/comments 3/14/08 3/14/08 3/14/08 OFFICE DORL/LPLIII-2/BC NRR/DCI/D DRP/D, R-III NRR/DORL/D NAME RGibb, CG for MEvans CPederson, SWest for Chaney, TJM for DATE 3/14/08 3/14/08 3/14/08 3/14/08 OFFICIAL AGENCY RECORD | ||
LaSalle Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL | Braidwood Station Units 1 and 2 cc: | ||
Document Control Desk - Licensing Site Vice President - Braidwood Exelon Generation Company, LLC Exelon Generation Company, LLC 4300 Winfield Road 35100 S. Rt. 53, Suite 84 Warrenville, IL 60555 Braceville, IL 60407-9619 Mr. Dwain W. Alexander, Project Manager Senior Vice President - Operations Support Westinghouse Electric Corporation Exelon Generation Company, LLC Energy Systems Business Unit 4300 Winfield Road Post Office Box 355 Warrenville, IL 60555 Pittsburgh, PA 15230 Chairman, Ogle County Board Ms. Bridget Little Rorem Post Office Box 357 Appleseed Coordinator Oregon, IL 61061 117 N. Linden Street Essex, IL 60935 Manager Regulatory Assurance - Braidwood Exelon Generation Company, LLC Howard A. Learner 35100 S. Rt. 53, Suite 84 Environmental Law and Policy Braceville, IL 60407-9619 Center of the Midwest 35 East Wacker Dr., Suite 1300 Director - Licensing and Regulatory Affairs Chicago, IL 60601-2110 Exelon Generation Company, LLC 4300 Winfield Road U.S. Nuclear Regulatory Commission Warrenville, IL 60555 Braidwood Resident Inspectors Office 35100 S. Rt. 53, Suite 79 Associate General Counsel Braceville, IL 60407 Exelon Generation Company, LLC 4300 Winfield Road Ms. Lorraine Creek Warrenville, IL 60555 RR 1, Box 182 Manteno, IL 60950 Senior Vice President - Midwest Operations Exelon Generation Company, LLC Illinois Emergency Management Agency 4300 Winfield Road Division of Disaster Assistance & Warrenville, IL 60555 Preparedness 1035 Outer Park Dr Vice President - Regulatory Affairs Springfield, IL 62704 Exelon Generation Company, LLC 4300 Winfield Road County Executive Warrenville, IL 60555 Will County Office Building 302 N. Chicago Street Manager Licensing - Braidwood, Byron and Joliet, IL 60432 LaSalle Exelon Generation Company, LLC Attorney General 4300 Winfield Road 500 S. Second Street Warrenville, IL 60555 Springfield, IL 62701 Plant Manager - Braidwood Station Exelon Generation Company, LLC 35100 S. Rt. 53, Suite 84 Braceville, IL 60407-9619}} | |||
Latest revision as of 19:40, 14 November 2019
| ML080740325 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 03/14/2008 |
| From: | Catherine Haney Plant Licensing Branch III-2 |
| To: | Pardee C Exelon Generation Co |
| Gratton C, NRR/DORL/LPL3-2, 415-1055 | |
| References | |
| TAC MD7295, NRR-07-008 | |
| Download: ML080740325 (2) | |
Text
March 14, 2008 Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
BRAIDWOOD STATION, UNIT 2 - EVALUATION OF NEW INFORMATION RELATED TO ALLOY 82/182 PRESSURIZER BUT WELD INSPECTIONS RE:
CONFIRMATORY ACTION LETTER NRR-07-008 (TAC NO. MD7295)
Dear Mr. Pardee:
On March 22, 2007, the U.S. Nuclear Regulatory Commission (NRC) issued Confirmatory Action Letter (CAL) No. NRR-07-008 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML070740294) regarding dissimilar metal welds in the pressurizer surge, spray, and safety/relief nozzle-to-safe end welds at Braidwood Station (Braidwood), Unit 2 . The CAL and the supporting commitment letter (ADAMS Accession No. ML070520499) indicate that inspection and mitigation actions may be conducted during your spring 2008 refueling outage, contingent on the industry providing an analysis that demonstrates an acceptable level of safety to the NRC for the operation of these welds until the spring of 2008.
The NRC received MRP-216, Rev. 1, Materials Reliability Program: Advanced FEA [Finite Element Analysis] Evaluation of Growth of Postulated Circumferential PWSCC [Primary Water Stress-Corrosion Cracking] Flaws in Pressurizer Nozzle Dissimilar Metal Welds, on August 13, 2007 (ADAMS Accession No. ML072410235). Based on our review of this report, NRC concluded that the analysis provided adequate justification to permit inspections during your spring 2008 refueling outage, and that the analysis was applicable to Braidwood, Unit 2. On September 7, 2007, the NRC issued a letter to Exelon Generation Company, LLC (ADAMS Accession No. ML072430292), informing you that a plant shutdown by December 31, 2007, was no longer needed and Braidwood, Unit 2 could continue to operate until the spring 2008 outage.
On March 4, 2008, the NRC became aware of emerging information regarding certain welds in nozzles on a retired pressurizer from a pressurized-water reactor facility. This was related to new reports (ADAMS Accession Nos. ML080701017 and ML080701020) on weld examinations of those nozzles. This information raised questions regarding the technical basis for the September 7, 2007, letter. The NRC dispatched technical experts in non-destructive examination to independently review industry analyses and actions regarding this matter. On March 13, 2008, a public meeting was held in NRC Headquarters, Rockville, MD, with representatives of the eight licensees whose plants had not yet shut down for spring 2008 outages and who are subject to commitments to inspect or mitigate similar welds during spring 2008 outages.
C. Pardee The NRC has evaluated the non-destructive automated phased array ultrasonic examination performed since March 4, 2008, and concluded there is reasonable assurance that there is no structurally significant service-related degradation in those nozzles that would alter the conclusions provided in our letter dated September 7, 2007, that allowed continued operation of Braidwood, Unit 2 until the spring 2008 refueling outage. The NRC will continue to evaluate new information as it becomes available. All other requirements of the CAL and the supporting commitment letter regarding enhanced inspection and leakage monitoring requirements for the reactor coolant system and associated reports remain valid.
The CAL will remain open until all CAL commitments pertaining to Braidwood, Unit 2 are complete.
Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at http://www.nrc.gov/about-nrc/regulatory/enforcement.html (click on Enforcement Policy or Enforcement Guidance) or by contacting the Government Printing Office (GPO) toll-free at 1-888-293-6498. The GPO is open from 7:00 a.m. to 9:00 p.m. EST, Monday through Friday (except Federal holidays).
In accordance with Title 10 of the Code of Federal Regulations, Part 2, Section 390, of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the NRCs document system (ADAMS),
accessible from the NRC Web site at http://www.nrc.gov/reading-rm.html.
Sincerely,
/RA by Tim McGinty for/
Catherine Haney, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-457 cc: See next page
C. Pardee The NRC has evaluated the non-destructive automated phased array ultrasonic examination performed since March 4, 2008, and concluded there is reasonable assurance that there is no detectable structurally significant operational degradation in those nozzles that would alter the conclusions provided in our letter dated September 7, 2007, that allowed continued operation of Braidwood, Unit 2 until the spring 2008 refueling outage. The NRC will continue to evaluate new information as it becomes available. All other requirements of the CAL and the supporting commitment letter regarding enhanced inspection and leakage monitoring requirements for the reactor coolant system and associated reports remain valid.
The CAL will remain open until all CAL commitments pertaining to Braidwood, Unit 2 are complete.
Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at http://www.nrc.gov/about-nrc/regulatory/enforcement.html (click on Enforcement Policy or Enforcement Guidance) or by contacting the Government Printing Office (GPO) toll-free at 1-888-293-6498. The GPO is open from 7:00 a.m. to 9:00 p.m. EST, Monday through Friday (except Federal holidays).
In accordance with Title 10 of the Code of Federal Regulations, Part 2, Section 390, of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the NRCs document system (ADAMS),
accessible from the NRC Web site at http://www.nrc.gov/reading-rm.html.
Sincerely,
/RA by Tim McGinty for/
Catherine Haney, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-457 cc: See next page DISTRIBUTION:
PUBLIC RidsNrrDirs RidsOEMailCenter LPL3-2 R/F RidsNrrDorl RidsOgcRp RidsAcrsAcnw&mMailCenter RidsNrrDorlLpl3-2 RidsRgn3MailCenter RidsEdoMailCenter RidsNrrLAJBurkhardt RLickus, R-III SLO RidsNrrOd RidsNrrLAEWhitt MWidman, EDO R-III RidsNrrDci RidsNrrPMMMarkley RJStrasma, OPA R-III RidsNrrDciCpnb RidsNrrPMMDavid ESullivan, NRR/DCI/CPNB ADAMS Accession No. ML080740325 (*) by e-mail (**) see previous concurrence NRR-106 OFFICE DCI/CPNB DCI/CPNB/BC DORL/LPL3-2/PM DORL/LPL4/LA NAME TSullivan TChan MDavid, CG for JBurkhardt DATE 3/14/08, w/comments 3/14/08 3/14/08 3/14/08 OFFICE DORL/LPLIII-2/BC NRR/DCI/D DRP/D, R-III NRR/DORL/D NAME RGibb, CG for MEvans CPederson, SWest for Chaney, TJM for DATE 3/14/08 3/14/08 3/14/08 3/14/08 OFFICIAL AGENCY RECORD
Braidwood Station Units 1 and 2 cc:
Document Control Desk - Licensing Site Vice President - Braidwood Exelon Generation Company, LLC Exelon Generation Company, LLC 4300 Winfield Road 35100 S. Rt. 53, Suite 84 Warrenville, IL 60555 Braceville, IL 60407-9619 Mr. Dwain W. Alexander, Project Manager Senior Vice President - Operations Support Westinghouse Electric Corporation Exelon Generation Company, LLC Energy Systems Business Unit 4300 Winfield Road Post Office Box 355 Warrenville, IL 60555 Pittsburgh, PA 15230 Chairman, Ogle County Board Ms. Bridget Little Rorem Post Office Box 357 Appleseed Coordinator Oregon, IL 61061 117 N. Linden Street Essex, IL 60935 Manager Regulatory Assurance - Braidwood Exelon Generation Company, LLC Howard A. Learner 35100 S. Rt. 53, Suite 84 Environmental Law and Policy Braceville, IL 60407-9619 Center of the Midwest 35 East Wacker Dr., Suite 1300 Director - Licensing and Regulatory Affairs Chicago, IL 60601-2110 Exelon Generation Company, LLC 4300 Winfield Road U.S. Nuclear Regulatory Commission Warrenville, IL 60555 Braidwood Resident Inspectors Office 35100 S. Rt. 53, Suite 79 Associate General Counsel Braceville, IL 60407 Exelon Generation Company, LLC 4300 Winfield Road Ms. Lorraine Creek Warrenville, IL 60555 RR 1, Box 182 Manteno, IL 60950 Senior Vice President - Midwest Operations Exelon Generation Company, LLC Illinois Emergency Management Agency 4300 Winfield Road Division of Disaster Assistance & Warrenville, IL 60555 Preparedness 1035 Outer Park Dr Vice President - Regulatory Affairs Springfield, IL 62704 Exelon Generation Company, LLC 4300 Winfield Road County Executive Warrenville, IL 60555 Will County Office Building 302 N. Chicago Street Manager Licensing - Braidwood, Byron and Joliet, IL 60432 LaSalle Exelon Generation Company, LLC Attorney General 4300 Winfield Road 500 S. Second Street Warrenville, IL 60555 Springfield, IL 62701 Plant Manager - Braidwood Station Exelon Generation Company, LLC 35100 S. Rt. 53, Suite 84 Braceville, IL 60407-9619