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{{#Wiki_filter:UNITED NUCLEAR REGULATORY WASHINGTON, D.C. 20555-0001 Nay 10, 2011 Mr. Timothy J. O'Connor Site Vice President Monticello Nuclear Generating Plant Northern States Power Company -Minnesota 2807 West County Road 75 Monticello, MN 55362-9637 MONTICELLO NUCLEAR GENERATING PLANT (MNGP) -EXAMINATION OF CLASS I SMALL-BORE PIPING BUTT WELDS (TAC NO. ME4087) | {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Nay 10, 2011 Mr. Timothy J. O'Connor Site Vice President Monticello Nuclear Generating Plant Northern States Power Company - Minnesota 2807 West County Road 75 Monticello, MN 55362-9637 | ||
==SUBJECT:== | |||
MONTICELLO NUCLEAR GENERATING PLANT (MNGP) - EXAMINATION OF CLASS I SMALL-BORE PIPING BUTT WELDS (TAC NO. ME4087) | |||
==Dear Mr. O'Connor:== | ==Dear Mr. O'Connor:== | ||
By letter dated May 14, 2010 (Accession No. ML101370259) | By letter dated May 14, 2010 (Accession No. ML101370259) Northern States Power Company | ||
Northern States Power Company -Minnesota (the licensee) corrected a commitment made regarding inspection of small-bore stainless steel butt weld connections. | - Minnesota (the licensee) corrected a commitment made regarding inspection of small-bore stainless steel butt weld connections. The commitment was made in MNGP's Application for Renewed Operating License dated March 16, 2005 (Accession No. ML050880245). Regarding in-service inspection, a paragraph in the Application stated: | ||
The commitment was made in MNGP's Application for Renewed Operating License dated March 16, 2005 (Accession No. ML050880245). | The MNGP ASME [American Society of Mechanical Engineers] Section XI In Service Inspection, Subsections IWB, IWC, and IWD Program is part of the MNGP ASME Section XI In-Service Inspection Program. This program is in accordance with ASME Section XI 1995 Edition through the 1996 Addenda and is subject to the limitations and modifications of 10 CFR 50.55a. | ||
Regarding in-service inspection, a paragraph in the Application stated: The MNGP ASME [American Society of Mechanical Engineers] | Under the "MNGP ASME Section XI In-Service Inspection (lSI), Subsections IWB, IWC, and IWD Program," Category B-F, B-J, C-F-1 and C-F-2 welds are being inspected under a Risk-Informed Inservice Inspection (RI-ISI) program that has been reviewed and authorized by the Nuclear Regulatory Commission (NRC) staff (Accession No. ML021490050). The RI-ISI program requires that 25 percent of the locations in the high risk region and 10 percent of the locations in the medium risk region be selected for inspection; non-socket welds are subject to volumetric examination. | ||
Section XI Service Inspection, Subsections IWB, IWC, and IWD Program is part of the MNGP ASME Section XI In-Service Inspection Program. This program is in accordance with ASME Section XI 1995 Edition through the 1996 Addenda and is subject to the limitations and modifications of 10 CFR 50.55a. Under the "MNGP ASME Section XI In-Service Inspection (lSI), Subsections IWB, IWC, and IWD Program," Category B-F, B-J, C-F-1 and C-F-2 welds are being inspected under a Risk-Informed Inservice Inspection (RI-ISI) program that has been reviewed and authorized by the Nuclear Regulatory Commission (NRC) staff (Accession No. ML021490050). | The NRC staff concluded in its safety evaluation report (NUREG-1865, Accession No. | ||
The RI-ISI program requires that 25 percent of the locations in the high risk region and 10 percent of the locations in the medium risk region be selected for inspection; non-socket welds are subject to volumetric examination. | ML063050414) for Monticello license renewal that, on the basis that the licensee used an appropriate methodology to exclude the aging effect of cracking in carbon steel small-bore piping and will perform a one-time inspection for cracking in stainless steel small-bore piping, the licensee's programs for managing aging effects in Class 1 small-bore piping was acceptable. | ||
The NRC staff concluded in its safety evaluation report (NUREG-1865, Accession No. ML063050414) for Monticello license renewal that, on the basis that the licensee used an appropriate methodology to exclude the aging effect of cracking in carbon steel small-bore piping and will perform a one-time inspection for cracking in stainless steel small-bore piping, the licensee's programs for managing aging effects in Class 1 small-bore piping was acceptable. | In the MNGP license renewal application annual update dated March 15, 2006 (Accession No. | ||
In the MNGP license renewal application annual update dated March 15, 2006 (Accession No. ML060800360), the licensee determined that butt weld connections less than 4 inches in diameter did not exist, and the requirement to inspect small-bore stainless steel butt welds was removed from the inspection scoping. As a result, the licensee did not inspect a sampling of small-bore stainless butt weld connections as part of the One-Time Inspection Aging T. J. O'Connor -2 Management Program per the guidance of NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Chapter XI, Program M32. The licensee's May 14, 2010, letter stated that a recently completed review of plant drawings indicated the existence of a limited number of small-bore stainless steel butt weld connections, under examination Category B-J. Thus, the licensee proposed to update the Updated Safety Analysis Report (USAR) to indicate performance of augmented lSI volumetric examinations on nominal pipe size (NPS) 2-inch through less than NPS 4-inch stainless steel butt welds, and to add these small-bore stainless steel butt welds to the "MNGP ASME Section XI In-Service Inspection, Subsections IWB, IWC, and IWD Aging Management Program." The licensee has made the following new commitment: | ML060800360), the licensee determined that butt weld connections less than 4 inches in diameter did not exist, and the requirement to inspect small-bore stainless steel butt welds was removed from the inspection scoping. As a result, the licensee did not inspect a sampling of small-bore stainless butt weld connections as part of the One-Time Inspection Aging | ||
MNGP will perform augmented lSI volumetric examinations of ASME Class I stainless steel small-bore butt welds with a 2-inch nominal pipe size (NPS) through less than 4-inch NPS in accordance with MNGP ASME Section XI Inservice Inspection Subsections IWB, IWC, and IWD Aging Management Program. The licensee's May 14, 2010, letter cites a precedent from Point Beach Nuclear Plant, where inspection of Category 8-F, B-J, C-F-1 and C-F-2 welds is performed under a RI-ISI program that has been authorized by the NRC (Accession No. ML031630940). | |||
In its safety evaluation of the Point Beach request (NUREG-1839, Accession No. ML053420137), the NRC staff accepted crediting the RI-ISI program inspections for the One-Time Inspection Program: "This alternative is also credited for the inspection of small bore piping prior to the period of extended operation instead of the One-Time Inspection Program, as recommended in NUREG-1801 Section XI.M32." On the basis of the MNGP license renewal SER, and the Point Beach precedent, the NRC staff finds MNGP's commitment to update the USAR and to add the small-bore stainless steel piping butt welds to the "MNGP ASME Section XI. Inservice Inspection Subsections IWB. IWC and IWD Aging Management Program" acceptable. | T. J. O'Connor -2 Management Program per the guidance of NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Chapter XI, Program M32. | ||
The licensee's May 14, 2010, letter stated that a recently completed review of plant drawings indicated the existence of a limited number of small-bore stainless steel butt weld connections, under examination Category B-J. Thus, the licensee proposed to update the Updated Safety Analysis Report (USAR) to indicate performance of augmented lSI volumetric examinations on nominal pipe size (NPS) 2-inch through less than NPS 4-inch stainless steel butt welds, and to add these small-bore stainless steel butt welds to the "MNGP ASME Section XI In-Service Inspection, Subsections IWB, IWC, and IWD Aging Management Program." | |||
The licensee has made the following new commitment: | |||
MNGP will perform augmented lSI volumetric examinations of ASME Class I stainless steel small-bore butt welds with a 2-inch nominal pipe size (NPS) through less than 4-inch NPS in accordance with MNGP ASME Section XI Inservice Inspection Subsections IWB, IWC, and IWD Aging Management Program. | |||
The licensee's May 14, 2010, letter cites a precedent from Point Beach Nuclear Plant, where inspection of Category 8-F, B-J, C-F-1 and C-F-2 welds is performed under a RI-ISI program that has been authorized by the NRC (Accession No. ML031630940). In its safety evaluation of the Point Beach request (NUREG-1839, Accession No. ML053420137), the NRC staff accepted crediting the RI-ISI program inspections for the One-Time Inspection Program: "This alternative is also credited for the inspection of small bore piping prior to the period of extended operation instead of the One-Time Inspection Program, as recommended in NUREG-1801 Section XI.M32." | |||
On the basis of the MNGP license renewal SER, and the Point Beach precedent, the NRC staff finds MNGP's commitment to update the USAR and to add the small-bore stainless steel piping butt welds to the "MNGP ASME Section XI. Inservice Inspection Subsections IWB. IWC and IWD Aging Management Program" acceptable. | |||
Sincerely. | Sincerely. | ||
Robert J. Pascarelli, Chief Project Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-263 cc: Listserv T. J. O'Connor -2 Management Program per the guidance of NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Chapter XI, Program M32. The licensee's May 14, 2010, letter stated that a recently completed review of plant drawings indicated the existence of a limited number of small-bore stainless steel butt weld connections, under examination Category B-J. Thus, the licensee proposed to update the Updated Safety Analysis Report (USAR) to indicate performance of augmented lSI volumetric examinations on nominal pipe size (NPS) 2-inch through less than NPS 4-inch stainless steel butt welds, and to add these small-bore stainless steel butt welds to the "MNGP ASME Section XI In-Service Inspection, Subsections IWB, IWC, and IWD Aging Management Program." The licensee has made the following new commitment: | Robert J. Pascarelli, Chief Project Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-263 cc: Listserv | ||
MNGP will perform augmented lSI volumetric examinations of ASME Class I stainless steel small-bore butt welds with a 2-inch nominal pipe size (NPS) through less than 4-inch NPS in accordance with MNGP ASME Section XI Inservice Inspection Subsections IWB, IWC, and IWD Aging Management Program. The licensee's May 14, 2010, letter cites a precedent from Point Beach Nuclear Plant, where inspection of Category B-F, B-J, C-F-1 and C-F-2 welds is performed under a RI-ISI program that has been authorized by the NRC (Accession No. ML031630940). | |||
In its safety evaluation of the Point Beach request (NUREG-1839, Accession No. ML053420137), the NRC staff accepted crediting the RI-ISI program inspections for the One-Time Inspection Program: "This alternative is also credited for the inspection of small bore piping prior to the period of extended operation instead of the One-Time Inspection Program, as recommended in NUREG-1801 Section XI.M32." On the basis of the MNGP license renewal SER, and the Point Beach precedent, the NRC staff finds MNGP's commitment to update the USAR and to add the small-bore stainless steel piping butt welds to the "MNGP ASME Section XI, Inservice Inspection Subsections IWB, IWC and IWD Aging Management Program" acceptable. | T. J. O'Connor -2 Management Program per the guidance of NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Chapter XI, Program M32. | ||
Sincerely, IRA! Robert J. Pascarelli, Chief Project Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-263 cc: Listserv DISTRIBUTION: | The licensee's May 14, 2010, letter stated that a recently completed review of plant drawings indicated the existence of a limited number of small-bore stainless steel butt weld connections, under examination Category B-J. Thus, the licensee proposed to update the Updated Safety Analysis Report (USAR) to indicate performance of augmented lSI volumetric examinations on nominal pipe size (NPS) 2-inch through less than NPS 4-inch stainless steel butt welds, and to add these small-bore stainless steel butt welds to the "MNGP ASME Section XI In-Service Inspection, Subsections IWB, IWC, and IWD Aging Management Program." | ||
PUBLIC RidsOgcRp Resource LPL3-1 Reading RidsAcrsAcnw_MailCtr Resource RidsNrrDorlLpl3-1 Resource RidsRgn3MailCenter Resource RidsNrrPMMonticello Resource RidsNrrDciCpnb Resource RidsNrrLABTully Resource JWallace, NRR DMerzke, EDO Rill Accession No'.. ML11122A096 OFFICE LPL3-1/PM LPL3-1/LA CPNB/BC(A}* | The licensee has made the following new commitment: | ||
LPL3-1BC NAME PTam BTuily DAlley* RPascarel1i DATE 5/3/11 5/3/11 4/22/10* 5/10/11 *Safety evaluation transmitted bye-mall of4/22/11 (AccesslonNo.ML111120289). | MNGP will perform augmented lSI volumetric examinations of ASME Class I stainless steel small-bore butt welds with a 2-inch nominal pipe size (NPS) through less than 4-inch NPS in accordance with MNGP ASME Section XI Inservice Inspection Subsections IWB, IWC, and IWD Aging Management Program. | ||
The licensee's May 14, 2010, letter cites a precedent from Point Beach Nuclear Plant, where inspection of Category B-F, B-J, C-F-1 and C-F-2 welds is performed under a RI-ISI program that has been authorized by the NRC (Accession No. ML031630940). In its safety evaluation of the Point Beach request (NUREG-1839, Accession No. ML053420137), the NRC staff accepted crediting the RI-ISI program inspections for the One-Time Inspection Program: "This alternative is also credited for the inspection of small bore piping prior to the period of extended operation instead of the One-Time Inspection Program, as recommended in NUREG-1801 Section XI.M32." | |||
On the basis of the MNGP license renewal SER, and the Point Beach precedent, the NRC staff finds MNGP's commitment to update the USAR and to add the small-bore stainless steel piping butt welds to the "MNGP ASME Section XI, Inservice Inspection Subsections IWB, IWC and IWD Aging Management Program" acceptable. | |||
Sincerely, IRA! | |||
Robert J. Pascarelli, Chief Project Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-263 cc: Listserv DISTRIBUTION: | |||
PUBLIC RidsOgcRp Resource LPL3-1 Reading RidsAcrsAcnw_MailCtr Resource RidsNrrDorlLpl3-1 Resource RidsRgn3MailCenter Resource RidsNrrPMMonticello Resource RidsNrrDciCpnb Resource RidsNrrLABTully Resource JWallace, NRR DMerzke, EDO Rill Accession No'.. ML11122A096 OFFICE LPL3-1/PM LPL3-1/LA CPNB/BC(A}* LPL3-1BC NAME PTam BTuily DAlley* RPascarel1i DATE 5/3/11 5/3/11 4/22/10* 5/10/11 | |||
*Safety evaluation transmitted bye-mall of4/22/11 (AccesslonNo.ML111120289). | |||
OFFICIAL RECORD COPY}} | OFFICIAL RECORD COPY}} | ||
Revision as of 01:19, 13 November 2019
| ML11122A096 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 05/10/2011 |
| From: | Robert Pascarelli Plant Licensing Branch III |
| To: | O'Connor T Northern States Power Co |
| tam P, NRR/DORL, 415-1451 | |
| References | |
| TAC ME4087 | |
| Download: ML11122A096 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Nay 10, 2011 Mr. Timothy J. O'Connor Site Vice President Monticello Nuclear Generating Plant Northern States Power Company - Minnesota 2807 West County Road 75 Monticello, MN 55362-9637
SUBJECT:
MONTICELLO NUCLEAR GENERATING PLANT (MNGP) - EXAMINATION OF CLASS I SMALL-BORE PIPING BUTT WELDS (TAC NO. ME4087)
Dear Mr. O'Connor:
By letter dated May 14, 2010 (Accession No. ML101370259) Northern States Power Company
- Minnesota (the licensee) corrected a commitment made regarding inspection of small-bore stainless steel butt weld connections. The commitment was made in MNGP's Application for Renewed Operating License dated March 16, 2005 (Accession No. ML050880245). Regarding in-service inspection, a paragraph in the Application stated:
The MNGP ASME [American Society of Mechanical Engineers] Section XI In Service Inspection, Subsections IWB, IWC, and IWD Program is part of the MNGP ASME Section XI In-Service Inspection Program. This program is in accordance with ASME Section XI 1995 Edition through the 1996 Addenda and is subject to the limitations and modifications of 10 CFR 50.55a.
Under the "MNGP ASME Section XI In-Service Inspection (lSI), Subsections IWB, IWC, and IWD Program," Category B-F, B-J, C-F-1 and C-F-2 welds are being inspected under a Risk-Informed Inservice Inspection (RI-ISI) program that has been reviewed and authorized by the Nuclear Regulatory Commission (NRC) staff (Accession No. ML021490050). The RI-ISI program requires that 25 percent of the locations in the high risk region and 10 percent of the locations in the medium risk region be selected for inspection; non-socket welds are subject to volumetric examination.
The NRC staff concluded in its safety evaluation report (NUREG-1865, Accession No.
ML063050414) for Monticello license renewal that, on the basis that the licensee used an appropriate methodology to exclude the aging effect of cracking in carbon steel small-bore piping and will perform a one-time inspection for cracking in stainless steel small-bore piping, the licensee's programs for managing aging effects in Class 1 small-bore piping was acceptable.
In the MNGP license renewal application annual update dated March 15, 2006 (Accession No.
ML060800360), the licensee determined that butt weld connections less than 4 inches in diameter did not exist, and the requirement to inspect small-bore stainless steel butt welds was removed from the inspection scoping. As a result, the licensee did not inspect a sampling of small-bore stainless butt weld connections as part of the One-Time Inspection Aging
T. J. O'Connor -2 Management Program per the guidance of NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Chapter XI, Program M32.
The licensee's May 14, 2010, letter stated that a recently completed review of plant drawings indicated the existence of a limited number of small-bore stainless steel butt weld connections, under examination Category B-J. Thus, the licensee proposed to update the Updated Safety Analysis Report (USAR) to indicate performance of augmented lSI volumetric examinations on nominal pipe size (NPS) 2-inch through less than NPS 4-inch stainless steel butt welds, and to add these small-bore stainless steel butt welds to the "MNGP ASME Section XI In-Service Inspection, Subsections IWB, IWC, and IWD Aging Management Program."
The licensee has made the following new commitment:
MNGP will perform augmented lSI volumetric examinations of ASME Class I stainless steel small-bore butt welds with a 2-inch nominal pipe size (NPS) through less than 4-inch NPS in accordance with MNGP ASME Section XI Inservice Inspection Subsections IWB, IWC, and IWD Aging Management Program.
The licensee's May 14, 2010, letter cites a precedent from Point Beach Nuclear Plant, where inspection of Category 8-F, B-J, C-F-1 and C-F-2 welds is performed under a RI-ISI program that has been authorized by the NRC (Accession No. ML031630940). In its safety evaluation of the Point Beach request (NUREG-1839, Accession No. ML053420137), the NRC staff accepted crediting the RI-ISI program inspections for the One-Time Inspection Program: "This alternative is also credited for the inspection of small bore piping prior to the period of extended operation instead of the One-Time Inspection Program, as recommended in NUREG-1801 Section XI.M32."
On the basis of the MNGP license renewal SER, and the Point Beach precedent, the NRC staff finds MNGP's commitment to update the USAR and to add the small-bore stainless steel piping butt welds to the "MNGP ASME Section XI. Inservice Inspection Subsections IWB. IWC and IWD Aging Management Program" acceptable.
Sincerely.
Robert J. Pascarelli, Chief Project Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-263 cc: Listserv
T. J. O'Connor -2 Management Program per the guidance of NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Chapter XI, Program M32.
The licensee's May 14, 2010, letter stated that a recently completed review of plant drawings indicated the existence of a limited number of small-bore stainless steel butt weld connections, under examination Category B-J. Thus, the licensee proposed to update the Updated Safety Analysis Report (USAR) to indicate performance of augmented lSI volumetric examinations on nominal pipe size (NPS) 2-inch through less than NPS 4-inch stainless steel butt welds, and to add these small-bore stainless steel butt welds to the "MNGP ASME Section XI In-Service Inspection, Subsections IWB, IWC, and IWD Aging Management Program."
The licensee has made the following new commitment:
MNGP will perform augmented lSI volumetric examinations of ASME Class I stainless steel small-bore butt welds with a 2-inch nominal pipe size (NPS) through less than 4-inch NPS in accordance with MNGP ASME Section XI Inservice Inspection Subsections IWB, IWC, and IWD Aging Management Program.
The licensee's May 14, 2010, letter cites a precedent from Point Beach Nuclear Plant, where inspection of Category B-F, B-J, C-F-1 and C-F-2 welds is performed under a RI-ISI program that has been authorized by the NRC (Accession No. ML031630940). In its safety evaluation of the Point Beach request (NUREG-1839, Accession No. ML053420137), the NRC staff accepted crediting the RI-ISI program inspections for the One-Time Inspection Program: "This alternative is also credited for the inspection of small bore piping prior to the period of extended operation instead of the One-Time Inspection Program, as recommended in NUREG-1801 Section XI.M32."
On the basis of the MNGP license renewal SER, and the Point Beach precedent, the NRC staff finds MNGP's commitment to update the USAR and to add the small-bore stainless steel piping butt welds to the "MNGP ASME Section XI, Inservice Inspection Subsections IWB, IWC and IWD Aging Management Program" acceptable.
Sincerely, IRA!
Robert J. Pascarelli, Chief Project Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-263 cc: Listserv DISTRIBUTION:
PUBLIC RidsOgcRp Resource LPL3-1 Reading RidsAcrsAcnw_MailCtr Resource RidsNrrDorlLpl3-1 Resource RidsRgn3MailCenter Resource RidsNrrPMMonticello Resource RidsNrrDciCpnb Resource RidsNrrLABTully Resource JWallace, NRR DMerzke, EDO Rill Accession No'.. ML11122A096 OFFICE LPL3-1/PM LPL3-1/LA CPNB/BC(A}* LPL3-1BC NAME PTam BTuily DAlley* RPascarel1i DATE 5/3/11 5/3/11 4/22/10* 5/10/11
- Safety evaluation transmitted bye-mall of4/22/11 (AccesslonNo.ML111120289).
OFFICIAL RECORD COPY