ML20141F260
| ML20141F260 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 06/26/1997 |
| From: | Sorensen J NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML19317C453 | List: |
| References | |
| NUDOCS 9707020204 | |
| Download: ML20141F260 (2) | |
Text
. . . _ - . -. . . .
Northern states Power Company 1717 Wakonade Dr. E.
Welch, MN 55089 Tekphone 612-388-1121 l
June 26,1997 U S Nuclear Regulatory Commission Attn: Document Control Desk l Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 ,
1 l
l Main Steam Line Break Methodoloav l I
1 in early 1994, NSP was developing new methods for calculating the Prairie Island Main Steam Line Break containment pressure response in anticipation of eventually submitting a license amendment request to reduce the boron concentration in the l boric acid storage tanks. While developing these new methoas, NSP determined I that some assumptions used in previous analyses were non-conservative. NSP ;
informed the NRC of these findings and prepared a justification for continued I operation which determined that both Prairie Island units could safely continue to operate.
NSP has completed development of the Prairie Island Main Steam Line Break methodology. Attachment 2 to this letter contains a proprietary version of these methodologies and Attachment 3 contains a non-proprietary version. NSP seeks )
NRC approval of the Prairie Island Main Steam Line Break methodology for use in ;
future analyses and to remove dependence on the justification for continued I operation for restart of each unit following each outage.
The Prairie Island Main Steam Line Break methodologies are considered company confidential, and as such NSP requests that Attachment 2 be withheld from public disclosure pursuant to 10 CFR 2.790(b)(1). The affidavit to support this request is provided as Attachment 1. .
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. 6/26/97
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- Page 2 of 2 i If you have any questions related to this submittal, please contact myself or Dale
[
Vincent at 612-388-1121. l l
d 4
l Joel P. Sorensen
- Plant Manager, l Prairie Island Nuclear Generating Plant j Attachments: !
l 1. Affidavit Requesting Withholding of Proprietary Information from Public
! Disclosure
! 2. Steam Line Break Methodology, NSPNAD-95002, June 1997, )
l Proprietary Version j Steam Line Break Core Methodology, NSPNAD-95002, June 1997, 3.
Non-Proprietary Version '
4 ;
j c: Regional Administrator-111, NRC
> NRR Project Manager, NRC j Senior Resident inspector, NRC ;
3 State of Minnesota (without Attachment 2) l
, Attn: Kris Sanda
- J E Silberg (without Attachment 2) '
4 4