ML18066A790
| ML18066A790 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/11/1996 |
| From: | Sheron B NRC (Affiliation Not Assigned) |
| To: | Bordine T CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| TAC-M96355, NUDOCS 9612260130 | |
| Download: ML18066A790 (4) | |
Text
{{#Wiki_filter:.. c ~,* . ',.~?- UNITED STATES NUCLEAR REGULATORY COMMISSION Mr. Thomas C. Bordine Manager, (icensing Palisades Plant WASHINGTON, D.C. 2055IHl001 October 11, 1996 27780 Blue Star Memorial Highway Covert, MI 49043
SUBJECT:
10 CFR 50.46 LARGE BREAK LOss~oF-COOLANT ACCIDENT EVALUATION MODEL . FOR PALISADES PLANT (TAC NO.. M96355)
Dear Mr. Bordine:
.*During August 1995, th~ Nuclear Regulatory Commission (NRC) met with Siemens Power Corporat i.on ( SPC) with regard to the.1 arge break 1oss-of-coo1 ant accident (LBLOCA) evaluation*model'. As a result of that meeting, we. sent a letter to SPC, dated November 13, 1995, ~hich ideritified probl~ms concerning changes in the*model. used by SPC for pressurized water reactors. This model* was approved by the NRC staff to nieet the requirements of 10 CFR 50.46 in the* letter of July 8, 1986, from D.M. *Crutchfi~ld {NRC) to G. Ward {Exxon). In the staff's letter of November 13, 1995, we stated that SPC had made
- changes to the NRC-approved Fuel Cooling Test~facility (FCTF) reflood heat*;
transfer coefficientcorrelation used in the TOODEE2 computer code and did not
- p~operly assess the significance. ~f the code changes. It appears that the following two major changes were mad~ to the FCT~ correlation in the TOODEEt code:
(1) some nonphysical non-monotonjc behavit>r of the *FCTF heat transfer
- coefficient correlation with respect to *the reflood_rate were eliminated and
- {2) the quench time calculation used in *the model, using data from Cylindrical Core Test Facility {CCTF) experiments, was modified.. By Jetter dated March
- 13, 1996, the staff requested*spc* to address the changes to_ the TOODEE2 model and the code errors identified ~ince J~ly ~986~
On June 2, 1996,-SPC submitted topical report XN-NF-82::.20, "EXEM/PWR Large Break LOCA ECCS TOODEE2 Updates," Revision 1, Supplement 5, which described the updates made t~ the TOODEE2 computer c9de*since 1986. The stiff has completed its. review Qf this report and.has c.oncluded that the proposed . LBLOCA-ECCS model (i.e., 1991 model) is not acceptable and the previous* approved model (i.e., the 1986 model) has an unacceptable error in the model. The staff's letter to SPC dated.October 11, 1996, which includes the.summary -- ~of conf eroence ca 11 s--w.ith SPC..on. October_ IO_ ~and ll, 1_99_6, on this matter, wi 11 be telecopied separately~.. _,... ** 260018 9612260130 961011 PDR ADOCK 05000255 P PDR ~ fA\\ -~.. ~
Mr. Thomas C. Bo*rdi ne *
- Because of the staff's-conclusions regarding the unaccepability of the reflood heat transfer coefficient correlation used in the TOODEE2 computer code, we conducted a conference call on Thursday, October 10, 1996, with several 1 icensees, including a representathe of your plant. Other participants were representatives from Comanche Peak Station Units 1/2, Kewaunee Plant, Millstone Station Unit 2, Robinson Plant Unit 2, Shearon Harris Plant Unit 1, St. Lucie Plant Unit 1, and SPC.
The purpose of the conference call was to inform each licensee tha.t the staff had found changes in the unapproved 1991
- LBLOCA eva 1 uatio:n model, which were intended to address prob 1 ems with the approved; 1986 mde l used by SPC for the LBLOCA and emergency core coo 1 i ng
.system analyses, unacc.eptable. In addition, the staff indicated that it will.
- not accept LBLOCA analyses using the previously approved 1986 model unless that model adequately corrects the non-physical behavior observed in the*
-ref-luod-heat t-r~::s-f.2-~ *~C*r:r-e~la-ti-on.: ~ Therefore, in accordance with 10 CFR 50.46(a)(3}(ii}, you should assess the impact of these model errors and changes and take whatever actions are required to*assure compliance* with 10 CFR 50.46. Further, as you were informed in the conference call, the staff has scheduled a public meeting on October 16, 1996" at 1:00 pm, in 0-12811, at its Headquarters Offices. The affected plants and *spc were,,requested.to attend this meeting to present. the results of thei~ asse~sment of the peak cladding temp~rature for the LBLOCA and.the corrective* actions and compensatory measures that have.been undertaken, both s~ort-term and long-term, to assure plant compliance with 10. CFR 50.46. If you ha~e ~ny questions abotit.thi~ matter, please contact Robert Schaaf ~t 301-415-1312, or Jack Donohew at 301-415-1307. . S.incerely, D~ w. PC,_:__
- , *Brian W. Sheron, Atting Associate Director for Technical Review Office of Nuclear Reactor Regulation Docket No. 50-255
. cc: ' See next page
Mr. Thomas C. Berdine Consumers Power Company cc: Mr. Thomas J. Palmisano Plant General Manager Palisades Plant 27780 Blue Star Memorial Highway Covert, ~ichigan 49043 Mr. Robert A. Fenech Vice President, Nuclear Operations Palisades Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043 .,.[ l. -Mlll er, *-rsqulre Sidley & Austin 54th Floor One First National Plaza. Chi~ago, Illinois 60603 Mr. Thomas A. McNish Vice President & Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road. Lisle, Illinois 60532-4351 Jerry Sarno Township Supervisor Covert Township 36197 M-140 Highway Covert, Michigan. 49043 Office bf the Gov~rnor Room 1 - Ca~itol Building Lans*ing~ MiC:higari *- 48913 *- U.S. Nuclear Regulatory Commission Resident Inspector's Office Palisades Plant 27782 Blue Star Memorial Highway Covert, Michigan 49043 Palisades Plant Drinking Water and Radiological Protection Division Michigan Department of Environmental Quality 3423 N. Martin Luther King Jr Blvd P. 0. Box 30630 CPH Mailroom Lansing, Michigan 48909-8130 Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 2300 N Street, N. W. Washin~to_~ _DC_. 20037
- Michigan Department of Attorney.
General Special Litigation Division 630 Law Building P.O. Box 30212 Lansing, Michigan 48909 August 1996
Mr. Thomas C. Bordine . s ~~ \\J~,I ~-~f~~r FMiraglia/AThadani RZimmerman JRoe JHannon BS heron GHol ahan. RJones TCollins RSchaaf
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