ML20080B540

Forwards Suppl to 941003 Application for Amends to Licenses DPR-42 & DPR-60 Re EDG Testing Requirements

ML20080B540
Person / Time
Site:	Prairie Island
Issue date:	11/30/1994
From:	Wadley M NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20080B542	List: ML20080B540 ML20080B544 ML20080B547
References
NUDOCS 9412050284
Download: ML20080B540 (2)

Text

A7 Northern States Power Company Prairie latand Nuclear Generating Plant 1717 Wakonade Dr. East Welch, Minnesota 55089 l

November 30, 1994 10 CFR Part 50 l Section 50.90 U S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 l

PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR 42 50-306 DPR-60  ;

1 Supplement to License Amendment Request Dated October 3, 1994 Emernency Diesel Generator Testing Requirements i On October 3, 1994, we submitted a License Amendment Request. The main i purpose of this License Amendment Request is to provide a wider band during the 24-hour load test which is performed every 18 months. The specification

currently calls for a 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> run at 105 - 110% of the continuous load rating

of the diesel generator. This range is too narrow when we consider the l potential instrument error and the inherent load swings associated with running the diesel generator connected to the system grid. The proposed specification provides a range of a load of 103 - 110% of the continuous rating.

During subsequent discussions with NRC staff we agreed to additional changes.

These additional changes are reflected in the attached revised page changes to the Technical Specifications, Appendix A of the Operating Licenses, for Prairie Island Nuclear Generating Plant, Units 1 and 2. The attached Exhibit B, Rev 1 and Exhibit C, Rev 1 replace the original Exhibits B and C in their entirety.

! The significant hazards analysis and safety evaluation submitted with the l October 3, 1994 License Amendment Request still apply since the additional

! changes restate the proposed requirements in a way which preserves the intent of the originally submitted proposal. As discussed with Sheri Peterson, we want to note that there is an error on Page 3 of Exhibit A of the October 3, 1994 letter. It states that the highest anticipated event load for Unit 1 is 2414 kW when, in fact it is 2510 kW. This is a less conservative value but remains more conservative than the regulatory guidance for sizing emergency

, diesel generators and therefore represents an acceptable decrease in margin.

l Thus, the discussion in the significant hazards analysis and safety evaluation remains valid.

l 00 941205o2g4 DR 941130 ADDCK 05000282 d l PDR i

I Northem States Power Company USNRC Page 2 of 2 November 30, 1994 i

Please contact Jack Leveille (612-388-1121, Ext. 4662) if you have any j questions concerning this License Amendment Request.

,/[/ L,) tc. f.et Michael D Wadley l Site General Manager Prairie Island Nuclear Generating Plant c: Regional Admini9trator-Region-III, NRC NRR Project Manager, NRC Senior Resident Inspector, NRC State of Minnesota Attn: Kris Sanda J E Silberg Attachments:

Affidavit Exhibit B, Rev 1 - Proposed Changes Marked-up on Existing Technical Specification Pages Exhibit C, Rev 1 - Revised Techr i cal Specifications Pages I

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