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
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Northern states Power Company 1717 Wakonade Dr. E.
Welch, MN 55089 Tekphone 612-388-1121 June 26,1997 U S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 l
Main Steam Line Break Methodoloav l
I 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 boric acid storage tanks. While developing these new methoas, NSP determined that some assumptions used in previous analyses were non-conservative. NSP informed the NRC of these findings and prepared a justification for continued 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 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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Page 2 of 2 i
If you have any questions related to this submittal, please contact myself or Dale
[
Vincent at 612-388-1121.
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
3.
Steam Line Break Core Methodology, NSPNAD-95002, June 1997, 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)
Attn: Kris Sanda J E Silberg (without Attachment 2) 4 4
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