ML20135F270

Discusses Licensee Responses to NRC Request That Nuclear Licensees Perform Review of Reactor Pressure Vessel Structural Integrity Assessments,Per GL 92-01,Rev 1,Suppl 1, Reactor Vessel Structural Integrity

ML20135F270
Person / Time
Site:	Monticello
Issue date:	12/09/1996
From:	Kim T NRC (Affiliation Not Assigned)
To:	Richard Anderson NORTHERN STATES POWER CO.
References
GL-92-01, GL-92-1, TAC-M92699, NUDOCS 9612120471
Download: ML20135F270 (4)

Text

Am att FO - M 3 g *, UNITED STATES

r j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066 4001

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+9***** December 9, 1996 Mr. Roger 0. Anderson, Director Licensing and Management Issues i

Northern States Power Company 414 Nicollet Mall Minneapolis, MN 55401 l

SUBJECT:

CLOSE0VT OF RESPONSE TO GENERIC LETTER 92-01, REVISION 1, SUPPLEMENT 1 FOR MONTICELLO NUCLEAR GENERATING PLANT (TAC NO. M92699)

Dear Mr. Anderson:

On May 19, 1995, the NRC issued Generic Letter 92-01, Revision 1, Supplement 1 (GL 92-01, R9v.1, Supp.1), " Reactor Vessel Structural Integrity." In GL 92-01, Rev. 1, Supp. 1, the NRC requested that nuclear licensees perform a review of their reactor pressure vessel structural integrity assessments in order "to identify, collect, and report any new data pertinent to [the]

analysis of [the] structural integrity of their reactor pressure vessels (RPVs) and to assess the impact of that data on their RPV integrity analyses relative to the requirements of Section 50.60 of Title 10 of the Code of Federal Regulatfons (10 CFR 50.60), 10 CFR 50.61, Appendices G and H to 10 CFR Part 50 (which encompass pressurized thermal shock (PTS) and upper shelf energy (USE) evaluations), and any potential impact on low temperature overpressure (LTOP) limits or pressure-temperature (P-T) limits."

More specifically, in GL 92-01, Rev.1, Supp.1, the NRC requested that addressees provide the following information in their responses:

(1) a description of those actions taken or planned to locate all data relevant to the determination of RPV integrity, or an explanation of why the existing data base is considered complete as previously submitted; (2) an assessment of any change in best-estimate chemistry based on consideration of all relevant data; (3) a determination of the need for the use of the ratio procedure in accordance with the established Position 2.1 of Regulatory Guide (RG) 1.99, Revision 2, for those licensees that use surveillance j data to provide a basis for the RPV integrity evaluation; and  :

O (4) a written report providing any newly acquired data as specified above yy and (1) the results of any necessary revisions to the evaluations of RPV 8% '

integrity in accordance with the requirements of 10 CFR 50.60, 10 CFR 50.61, Appendices G and H to 10 CFR Part 50, and any potential impact on the LTOP and P-T limits in the technical specifications, or (2) a certification that previously submitted evaluations remain valid.

1200s1 NRC FILE CENTER COPY 9612120471 961209 PDR ADOCK 05000263 P PDR

h Roger 0. Anderson r Revised evaluations and certifications were to include consideration of j Position 2.1 of RG 1.99, Revision 2, as applicable, and any new data. The 4

information in Reporting Item (1) was to be submitted within 90 days of the issuance of the GL. The information in Reporting Items (2) - (4) was to be ,

submitted within 6 months of the issuance of the GL.

i The NRc. staff has noted that Northern States Power (NSP) Company submitted the information requested in Reporting Item (1) on August 17, 1995, and Reporting Items (2) - (4) on November 13, 1995. Your response indicates that NSP has performed some additional reviews of the pertinent Owners Group databases and '

has not found any additional data regarding the best-estimate chemistries for -

the RPV materials and surveillance capsules at the Monticello Nuclear Generating Plant. Since NSP has submitted the requested information and has indicated that the previously submitted evaluations remain valid, the staff considers the RPV integrity data for Monticello to be complete at this time.

The staff therefore concludes that no additional information regarding the structural integrity of the RPV at Monticello is available at this time, and that your efforts regarding GL 92-01, Rev. 1, Supp. I are complete. This completes all actions related to the referenced TAC Number.

The staff has also noted that you consider some of the information from the databases to be interim data pending further verification. We request that you provide us with the results of your re-evaluations of any new information you receive relative to your plant. When you provide this information, the staff may open a plant-specific TAC No. for its review.

Thank you for your cooperation. If you have any questions regarding this matter, please do not hesitate to contact me at (301) 415-1392.

Sincerely,

% fe w Tae Kim, Senior Project Manager Project Directorate 111-1 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation Docket No. 50-263 cc: See next page

Roger 0. Anderson Revised evaluations and certifications were to include consideration of Position 2.1 of RG 1.99, Revision 2, as applicable,. and any new data. The

-information in Reporting Item (1) was to be submitted within 90 days of the issuance of the GL. The information in Reporting Items (2) - (4) was to be submitted within 6 months of the issuance of the GL.

The NRC staff has noted that Northern States Power (NSP) Company submitted the information requested in Reporting Item (1) on August 17, 1995, and Reporting Items (2) - (4) on November 13, 1995. Your response indicates that NSP has performed some additional reviews of the pertinent Owners Group databases and has not found any additional data regarding the best-estimate chemistries for the RPV materials and surveillance capsules at the Monticello Nuclear Generating Plant. Since NSP has submitted the requested information and has indicated that the previously submitted evaluations remain valid, the staff considers the RPV integrity data for Monticello to be complete at this time.

The staff therefore concludes that no additional information regarding the structural integrity of the RPV at Monticello is available at this time, and that your efforts regarding GL 92-01, Rev. 1, Supp. 1 are complete. This completes all actions related to the referenced TAC Number.

The staff has also noted that you consider some of the information from the databases to be interim data pending further verification. We request that you provide us with the results of your re-evaluations of any new information you receive relative to your plant. When you provide this information, the staff may open a plant-specific TAC No. for its review.

Thank you for your cooperation. If you have any questions regarding this matter, please do not hesitate to contact me at (301) 415-1392.

Sincerely, Original signed by Tae Kim Tae Kim, Senior Project Manager Project Directorate 111-1 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation Docket No. 50-263 cc: See next page DISTRIBUTION:

Docket File (50-263) PUBLIC PD 3-1 Reading

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Mr. Roger 0. Anderson, Director Monticello Nuclear Generating Plant Northern States Power Company cc:

J. E. Silberg, Esquire Adonis A. Neblett

! Shaw, Pittman, Potts and Trowbridge Assistant Attorney General 2300 N Street, N. W. Office of the Attorney Generr.1 Washington DC 20037 445 Minnesota Street Suite 900 U.S. Nuclear Regulatory Comission St. Paul, Minnesota 55101-2127 Resident Inspector's Office 2807 W. County Road 75 Monticello, Minnesota 55362 Plant Manager Monticello Nuclear Generating Plant ATTN: Site Licensing Northern States Power Company 2807 West County Road 75 Monticello, Minnesota 55362-9637 Robert Nelson, President Minnesota Environmental Control l

Citizens Association (MECCA) 1051 South McKnight Road St. Paul, Minnesota 55119 Comissioner Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, Minnesota 55119 Regional Administrator, Region III U.S. Nuclear Regulatory Comission 801 Warrenville Road Lisle, Illinois 60532-4351 Comissioner of Health Minnesota Department of Health 717 Delaware Street, S. E.

Minneapolis, Minnesota 55440 Darla Groshens, Auditor / Treasurer Wright County Government Center l 10 NW Second Street Buffalo, Minnesota 55313 Kris Sanda, Comissioner Department of Public Service 121 Seventh Place East i

Suite 200 St. Paul, Minnesota 55101-2145  ;-,y m3 4