ML20035B371
| ML20035B371 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Catawba, McGuire  |
| Issue date: | 03/25/1993 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20035B372 | List: |
| References | |
| NUDOCS 9304010252 | |
| Download: ML20035B371 (2) | |
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Dukeltras Cornpany flat B. Dram
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PO. Bcx 1996 Senior Vice Pruident Charlotte, NC28201-2006 Nuclear Genrration R
(704)3S2-4S31
- DUKEPOWER i
March 25,1993-3 U. S. Nuclear Regulatory Commission L
Attentioni Document Centrol Desk Washington D. C. 20555
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Subject:
Catawba Nuclear Station Docket Nos. 50-413 and 50-414 n
McGuire Nuclear Station e
Decket Nos. 50-369 and 50-370
Dear Sir:
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On April 25,1986, Duke Power Company proposed a plan for the resolution of concerns on the survivability of containment equipment, fans, and ice condenser doors when subjected to hydrogen deflagrations during postulated accidenis. The resolution plan outlined additional analyses to be performed by Duke Power Company. These new analyses would include the selection of additional core damage sequences for the containment response calculations. This proposal and the staff's acceptance of the proposed plan are reflected in Supplement 6 to the Catawba Safety Evaluation Report.
t In 1986,1988, and again in 1989 DPC submitted to the NRC information on the mass-energy releases to be used in the subsequent containment response analysis. By letter dated February 3,1993, the staff agreed that the accident sequences selected to encompass an appropriate range of scenarios consistent with the intent of 10 CFR 50.44(c)(3)(vi)(B)(3), and requested the -
submittal of the remainder of the information in accordance with the resolution plan.
Attached are five (5) copies of Revision 15 to Duke Power Company's Report, "An Analysis of Hydregen Control Measures at McGuire Nuclear Station". As noted in Revision 9, this report is applicable to the Catawba Nuclear Station. This revision adds a new section, 8.0, to the L
report. Section 8.0, " Supplemental Analyses", contains the containment remonse analysis and F
the equipment survivability evalcation based on the required additior.a1 accioent scenarios. This -
E wek was performed using the MAAP code for the mass-energy releases to the containment, the HECTR code for the containment response, and is applicable to both the McGuire and Catawba Nuclear Stations b
'1he results of the HECTR analyses indicate that the global peak temperatures predicted in the l
earlier CLASIX analyses were conservatively high values. The earlier equipment survivability evaluations based on an S2D sequence with hydrogen combustion temperatures calculated using CLAF~ ggyfyg ygynences analyni in Section 8.0, the differential pressures that c
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U. S. Nuclear Regulatory Commission March 25,1993 Page 2 result from upper compartmer.t burns are found to not adversely affect survivability of the air return fans and the ice condenser doors. The results demonstrate that Catawba and McGuire continue to meet the requirements of 10CFR 50.44.
If there any questions, please call Scott Gewehr at (704) 382-7581 or Michael Barrett at (704) 382-6754.
Very truly yours, x.6 Hal B. Tucker i
cc: Mr. T. A. Reed, Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 8H23, OWFN Washington, D. C. 20555
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Mr. R. E. Martin, Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Step 4H23, OWFN l
Washington, D. C. 20555 Mr. S. D. Ebneter, Rel c sal Administrator
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i U.S. Nuclear Regulatory Commission - Region II
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101 Marietta Street, NW - Suite 2900 Atlanta, Georgia 30323 Mr. P. K. Van Doorn Senior Resident Inspector McGuire Nuclear Station t
Mr. W. T. Orders Senior Resident Inspector Catawba Nuclear Station t
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