ML20202H675

Forwards Rev 1 to License Amend,Dtd 960726,for License DPR-22,increasing MNGP Operating License Max Power Level from 1670 Mwt to 1775 Mwt.Proprietary Rev 1 to NEDC-32546P & Rev 1 to NEDC-32514P,encl.Proprietary Info Withheld

ML20202H675
Person / Time
Site:	Monticello
Issue date:	12/04/1997
From:	Hammer M NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19317C757	List: ML20202H675 ML20202H686 ML20202H706
References
FACA, NUDOCS 9712100340
Download: ML20202H675 (2)

Text

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Mr Northem States Power Company Monticello Nuclear oenerating Plant 2807 West Hwy 75 M "t*i' ' "#* '$***"'#

D M M 1997 US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. OPR-22 Revision 1 to License Amendment Request Dated July 26,1996 Supporting the Monticello Nuclear Generating Plan _t Power Rerate Program Attached is Revision 1 to a proposed change to Operating License DPR-22, Docket No. 50-263, for the Monticello Nuclear Generating Plant (MNGP) dated July 26,1996. This request is submitted in accordance with the provisions of 10 CFR 50.90. This revision supersedes the previous rerate license amendment request in all respects except for Exhibit F which has not been changed. Descriptions of the significant changes from the indial submittal are provided in Exhibit J. Changes to correct grammatical errors and changes that were made for the sole purpose of improving clarity without affecting contert are not identified in Exhibit J.

The requested amendment proposes an increase in the MNGP Operating License maximum power level from 1670 megawatts thermal to 1775 megawatts thermal. This change reflects an increase of 6.3% above the currently licensed power level of 1670 megawatts thermal. The proposed action supports the MNGP project commonly referred to as Power Rerate.

SupplementalInformation By letter dated September 5,1997, NSP submitted its response to a staff RAI conceming power rerate. By letters dated June 19,1997, July 16,1997 (2), and July 21,1997, NSP submitted its justification for containment analyses that bound power rerate operating conditions. These letters, in part, provide information that supports this request and should be considered as supplements to the license amendment request. I I g2100340971204

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NSP was recently informed of an apparent error in the generic terate analysis for an Anticipated Transient Without Scram (ATWS), This information wat conveyed to the staff by a phone conversation on November 17,1097. The error involves analytical assumptions for Boron concentration. Generai Electric is working to correct this error in the generic analysis. The extent of the error and its associated correction, as it is currently known to NSP, is not expected to prevent an analytical demonstration of successful mitigation of the ATWS event at power rerate conditions. NSP wil; submit a supplement to this revision of the license. amendment request that confirms the acceptability of the revised generic ATWS analysis for MNGP at rerate conditions.

Rosolution of Previous Power Rotato issues By letter dated January 27,1997, NSP committed to conduct an independent review of the Monticello Power Rerate program. This review is complete. Issues identified during this review have been resolved. The issues centained in Attachment A of this letter were also completed with the following exceptions.

An evaluation of long-term post-LOCA heatup of the reactor building is in progress. The intent of this calculation is to confirm the conservatism of assumptions used in the rerate evaluation of Generic Letter 89-10 Motor Operated Valves and SBGT System inlet and ambient temperatures. HELB impacts on Generic Letter 8910 Motor Operated Valves have been evaluated. No impact on this submittalis anticipated. A commitment to complete this evaluation is contained in Exhibit H.

In accordance with a previous commitment, the calculation to support ECCS pump NPSH fsr debris loading on suction strainers will be completed by the end of the 1998 refueling outage.

This approach has previously been reviewed and approved by the staff by SER dated July 25, 1997.

A number of commitments associated with this license amendment request are contained in Exhibit H. NSP expects that these commitments will be incorporated into the MNGP operating license.

ProprietaryInformation Exhibits E and G contain information proprietary to GE. GE requests that these documents be withheld from public disclosure in accordance with 10CFR2.790(a)(4). An affidavit supporting this request in accordance with 10CFR2.790(b)(1) is provided with Exhibits E and G.

t4{/VJ1W Mic,bvI F. Hammer Plant Manager Monticello Nuclear Generating Plant

c: Regional Administrator-Ill, NRC NRR Project Manager, NRC - 15 copies Resident inspector, NRC State of Minnesota, Attn: Kris Sanda Jay Silberg, Esq.

Attachments:

NSP Affidavit to the US Nuclear Regulatory Commission Exhibit A - Evaluation of Proposed Changes to Facility Operating License DPR-22 and the Technical Spe Nfications for Operating License DPR-22 Exhibit B - Proposed Changes Markcd Up On Operating License and Technical Specification Pages Exhibit C - Revised Operating License and Technical Specification Pages Exhibit D - Summary of Plant Modifications for Power Rerate implementation Exhibit E - NEDC-32546P ' Power Rerate Safety Analysis Report for Monticello Nuclear Generating Plant'with GE Affidavit Exhibit F - MNGP Power Rerate Environmental Evaluation (Revised Cover Page Only)

Exhibit G - NEDC-32514P 'Monticello SAFER /GESTR-LOCA Loss-of Coolant Accident Analysis' with GE Affidavit Exhibit H - License Commitments Associated with Rev.1 of the MNGP Power Rerate License Amendment Request Exhibit 1 - Evaluation of Offsite Power Under Power Rerate Conditions Exhibit J - Description of Revisions to Power Rerate License Amendment Request dated July 26,1996 Exhibit K - Evaluation of Proposed Changes to Selected USAR Sections

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