ML19262C164
| ML19262C164 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 01/17/1980 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8002070039 | |
| Download: ML19262C164 (7) | |
Text
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JAN 1'l M Docket No: 50-358 Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas & Electric Company P. O. Box 960 Cincinnati, Ohio 45201
Dear Mr. Borgmann:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (WM. H. ZIMMER, UNIT N0. 1)
In order that we may continue our review of your application for a license to operate the Zimer Nuclear Power Station, Unit No.1, your response to the enclosed request for additional infomation is needed.
The request is based upon information contained in your application as amended through Revision 62 and your responses to our previous requests. We will need your response to this request prior to April 30, 1980.
Please contact us if you desire infomation or clarification regarding the enclosure.
Sincerely,
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'oh F. Stolz, Chief t Water Reactors Branch No.1 Division of Project Management
Enclosure:
Requests for Additional Infomation cc:
See next page 1926 164 8002070 03C[
1 cc: Troy B. Conner, Jr., Esq.
David B. Fankhauser, PhD Conner, Moore & Corber 3569 Nine *?ile Road 1747 Pennsylvania Avenue, N. W.
Cinc* w
, Ohio 45230 Washington, D. C.
20006 Dr. Frank F. Hooper Mr. William J. Moran School of Natural Resources General Counsel.
University of "ichigan The Cincinnati Gas and Electric Ann Arbor, Michigan 48109 Company P. 0. Box 960 Mr. Stephen Schumacher Cincinnati, Ohio 45201 Miami Valley Power Project P. 0. Box 252 fir. William G. Porter, Jr.
Dayton, Ohio 45401 Porter, Stanley, Arthur and Platt lis. Augusta Prince, Chairperson 37 West Broad Street 601 Stanley Avenue Columbus, Ohiu 43215 Cincinnati, Ohio 45226 fir. Steven G. Smith, Manaaer Charles Bechhoefer, Esq., Chairman Engineering & Project Control Atomic Safety & Licensing Board The Dayton Power and Light Panel Company U. S. Nuclear Regulatory Comission P. O. Box 1247 Washington, D. C.
20555 Dayton, Ohio 45401 Mr. Glenn 0. Bright J. Robert Newlin, Counsel Atomic Safety and Licensing The Dayton Power and Light Board Panel Company U. S. Nuclear Regulatory Comission P. O. Box 1247 Washington, D. C.
20555 Dayton, Ohio 45401 Leah S. Kosik Esq.
Mr. James D. Flynn 3454 Cornell Place Manager, Licensing Cincinnati, Ohio 45220 Environmental Affairs The Cincinnati Gas and W. Peter Heile, Esq.
Electric Company Assistant City Solicitor P. 0. Box 960 Room 214, City Hall Cincinnati, Ohio 45201 Cincinnati, Ohio 45220 Mr. J. P. Fenstermaker Atomic Safety and Licensing Board Senior Vice President-0perations Panel Columbus and Southern Ohio U. S. Nuclear Regulatory Comission Electric Company Washington, D. C.
20555 215 North Front Street Columbus, Ohio 43215 Atomic Safety and Licensing Appeal Board David Martin, Esq.
U. S. Nuclear Regulatory Commission Office of the Attorney General Washington, D. C.
20555 209 St. Clair Street First Floor Resident Inspector /Zimmer Frankfort, Kentucky 40601 U. S. Nuclear Regulatory Comission P. O. Box 58 New Richmond, Ohio 451E' 1926 165
1 ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION WM. H. ZIMMER ROUND-TWO QUESTIONS INTRODUCTION This enclosure consists of the thirty-first in a series of positions (and requests for additional information). We will need your response in order to complete our safety cycluation of your Zimmer OL application. The requests are in the area of:
130.0 Structural Engineering 423.0 Initial Test Program It will be helpful to us if your responses are in a " Position and Response" fomat using the same number designation as the position. The first number designated the review area and the second (in parentheses) designated the associated section of the FSAR. Of course, your responses should include revision to the FSAR wherever appropriate.
NOTE Request 130.28 seeks additional infomation on the structural responses of Category I structures by using the half space analysis method for soil-structure interaction.
The attached infomation is requested because state of the art reveals that (1) the half space analysis is a well-known method whose use in comparing structural responses to those from the shear-beam-finite-element method will enable the reviewer to better assess the degree of conservatism in the results of the shear-beam-finite-element analysis for the plant and, (2) the implemen-tation of the half space analysis method on other plants has revealed that some numerical results of th( shear-beam-finite-element analysis are less conservative than the results of the half space method because of the different assumptions and/or modeling techniques being employed. We would be happy to meet with you or hold telephone discussions to explain or clarify this requested infomation.
Regarding request 4?3.40 it was recently brought to our attention by IE that some applicants do not intend to perfonn full-load tests of vital 480 volt AC buses using all sources af power supplies to the buses. As a result, some 4160-480 volt transformers would not be full-load tested. Our concern is that if the trans-formers were not properly sized, a loss of voltage or a degraded voltage condition on the vital buses during an accident could result. These applicants had committed in their FSAR to Regulatory Guide 1.68 and did not take exception to the part which states that load testing of vital buses and their power supolies should be conducted.
However, their test descriptions (in FSAR Chapter 14) did not state explicitly that this testing would be conducted, and they maintained that their progrc.ms had been approved without full-load tests of these transfonven 1926 166
. Zimmer is comitted to Regulatory Guide 1.68, but did not state explicitly in its test abstracts that this testing will be conducted.
It is our position that full-load tests of the vital bases must be conducted including all power supplies.
e 1926 167
130.0 Structural Engineering 130.28 Recent developments have shown that narkedly varying results can be cal-culated by various methods of soil-structure interaction analyses. The cceplexity of methods such as those employed for the Zimner Station preclude an a priori assessment of the significance of the calculated structural resconses for review purposes by the Staff.
Characterization of the calculated responses for review purposes is best achieved by comparing the presently calculated structural response at a few typical locations with the response at these sa e locations calculated by another well-known method.
We request that you perform this limited comparison for all seismic Category I structures at the Zimmer station using the half space method (frequency independent ccmpliance functions) employing current R.Gs. 1.60 and 1.61 criteria for the Safe Shutdown Earthquake. 'lary the soil properties to include the average values and the vocer and lower bound values in the analysis.
Show the key floor response spectr4 seismic forces (shear and acment) and deflections for all seismic Cate-gory I structures and compare to current corresponding quantities.
If calculated results using the half space method and using R.Gs. 1.60 and 1.61 criteria are greater than the current response, assess the safety significance of the differences in res onse.
~
1926 168
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For the containment, floor response spectra (at 2*. and 5". damping) should be provided at the operating floor, reactor stabilizer level, reactor vessel support, divider barrier, base mat, and the refueling hatch. For other seismic Category I structures, floor response spectra (at 2:: and 5!; damping) should be provid=c at the base. tat, an inter eciate alevation,and an apper alevation.
1926 169
s 423.0[
Initial Test Program 423.@
It has come to our attention that although some applicants had committed to Regulatory Guide 1.68, they did not intend to conduct full-load t ',cs of some 4160-480 volt transformers supplying power to vital buses. Your test description in FSAR Chapter 14 does not contain sufficient detail for us to detemine if you intend to conduct such a test.
It is our position that full-load tests of vital buses must be conducted including all sources of power supplies to the buses.
Modify your test description to indicate that this testing will be conducted in accordance with Regulatory Guide 1.68.
1926 170