ML081920547
| ML081920547 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 07/10/2008 |
| From: | David Loveless Division of Reactor Safety IV |
| To: | Sutton K Nebraska Public Power District (NPPD) |
| References | |
| Download: ML081920547 (3) | |
Text
Kent E. Sutton July 10, 2008 Kent E. Sutton Risk Management Supervisor Cooper Nuclear Station Nebraska Public Power District P.O. Box 98 Brownville, NE 68321
Dear Mr. Sutton:
This is in response to your email, dated July, 2, 2008 (ML081910409), requesting the linked event tree model of Cooper Nuclear Station control room abandonment developed by Region IV as described in our letter (Caniano to Minahan, dated June 13, 2008). Please find enclosed a compact disk (CD) containing this model. The CD contains the electronic files for the version of the model used in our recent significance determination addressed in Enforcement Action EA 07-204. SAPHIRE software Version 7.27 is required to perform analyses using this model. The SAPHIRE software can be obtained at the NRC Reactor Safety Code User Information Exchange web page http://www.nrccodes.com/. The model is provided in a single folder that should be copied directly to the same computer drive that contains the SAPHIRE software files.
The model includes core damage risk resulting from postulated fires in each of five fire areas designated as control room evacuation areas. The model also uses appropriate system fault trees contained in the Standardized Plant Analysis Risk model, Revision 3.40 for the Cooper Nuclear Station including the standardized input data for equipment and human performance available in that model. For your convenience, the change sets used in our recent significance determination were provided with the model. The model is currently configured to produce the case evaluation used in our final determination as discussed in our June 13, 2008 letter.
Therefore, you should be able to view the cutsets from this model using the SAPHIRE software.
This should represent the cutsets that you requested in Item 1 of your followup email, dated July 8, 2008 (ML081910406).
If you have questions about the model please contact me at (817) 860-8161 (e-mail address:
David.Loveless@nrc.gov). Questions and suggestions related to the SPAR and/or the system fault trees may also be directed to Mr. Robert Buell of the Idaho National Laboratory at (208) 526-9400 (e-mail address: Robert.Buell@inl.gov). If you have questions about SAPHIRE or would like to receive on-going technical support and your organization is not already a member, you are invited to join the SAPHIRE Users Group. Mr. Dan ONeal, NRC program manager for SAPHIRE, at (301) 415-4146 (e-mail address: Daniel.ONeal@nrc.gov) can provide more details about the group and the services offered.
UNITED STATES NUCLEAR REGULATORY COMM ISSION R E GI ON I V 612 EAST LAMAR BLVD, SUITE 400 ARLINGTON, TEXAS 76011-4125
Kent In accordance with 10 CFR 2.390 of the NRC's "Rules of Practice," a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the NRCs document system (ADAMS), accessible from the NRC website at www.nrc.gov/reading-rm/pdr.html or www.nrc.gov/reading-rm/adams.html. However, because of the sensitivity of the model contained in the enclosure, and in accordance with 10 CFR 2.390, a copy of this letters enclosure will not be available for public inspection. This model is being provided only for your organizations use and is not to be distributed further without the written consent of the Nuclear Regulatory Commission.
Sincerely,
/RA/
David P. Loveless Senior Reactor Analyst Division of Reactor Safety Docket: 50-298 License: DPR-46
Enclosure:
One CD containing:
- 1. Linked Event Tree Model of Cooper Nuclear Station Control Room abandonment
- 2. Change Sets to Model cc w/o enclosure:
David Van Der Kamp Licensing Manager Nebraska Public Power District P.O. Box 98 Brownville, NE 68321 Virgel T. Furr Risk Management Engineer Cooper Nuclear Station Nebraska Public Power District P.O. Box 98 Brownville, NE 68321
Kent Electronic distribution by RIV:
DRP Director (Dwight.Chamberlain@nrc.gov)
DRS Director (Roy.Caniano@nrc.gov)
DRS Deputy Director (Troy.Pruett@nrc.gov)
Senior Resident Inspector (Nick.Taylor@nrc.gov)
Branch Chief, DRP/C (Rick.Deese@nrc.gov)
Branch Chief, DRS/EB2 (Neil.OKeefe@nrc.gov)
Senior Project Engineer, DRP/C (Wayne.Walker@nrc.gov)
Team Leader, DRP/TSS (Chuck.Paulk@nrc.gov)
Michael.Runyan@nrc.gov Linda.Smith@nrc.gov Michael.Franovich@nrc.gov Jeff.Circle@nrc.gov Peter.Appignani@nrc.gov Risk Model on CD-ROM Enclosure - OUO:
SUNSI Review Completed:
DPL ADAMS: Yes No Initials: _______
Publicly Available Non-Publicly Available Sensitive Non-Sensitive Letter Only:
SUNSI Review Completed:
DPL ADAMS: Yes No Initials: _______
Publicly Available Non-Publicly Available Sensitive Non-Sensitive S:\\DRS\\REPORTS\\Cooper Evacuation Model Letter.doc SRA/DRS C:DRS/EB2 DPLoveless NFOKeefe
/RA/
/RA/
07/10/2008 07/10/2008 OFFICIAL RECORD COPY T=Telephone E=E-mail F=Fax