ML19271A886
| ML19271A886 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/04/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Peoples D COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8008110064 | |
| Download: ML19271A886 (4) | |
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- AUG 0 41980 Docket No. 50-10 Mr. D. Louis Peoples Director of Nuclear Licensing Comonwealth Edison Co@any Post Office 767 Chicago, Illinois 60690 Gentlemen:
RE: ORESDEN Our letter to you dated January 15, 1979 requested that you initiate as part of the Systematic Evaluation Program (SEP) a program to demonstrate the seismic design adequacy of your facility.
In relation to this request, we are aware of your efforts to develop a site specific ground response spectrum for your site; however, active structural / mechanical evaluations have not specifically been i nitiated. You are requested to submit, by September 15, 1980, details of your plans for proceeding with a seismic evaluation program and provide justification for why you conclude that continued operation is justified in the interim until the program is co@lete.
Your submittal should address the scope of review and evaluation criteria and pro-vide a schedule for cogletion. The analytical portion of your program should be cogleted no later than January 1,1982. Any modifications to the facility that may be necessary as a result of your evaluations should be installed by the following refueling outage, but no later than January 1,1983. Any proposed changes to the facility as described in the safety analysis report shall be made in accordance with 10 CFR 50.59 of the Comission Regulations.
As a minimum, your program should provide for an evaluation of:
1.
The integrity of the reactor coolant pressure boundary, 2.
The integrity of flubi and electrical distribution systems related to safe shutdown and engineered safety features, 3.
The integrity and functionability of mechanical and electrical equipment and engineered safety feature systems (including containment).
Although we have delayed until the end of 1980 a final decision relative to seismic input to maximize the potential benefits to be derived from use of site specific ground response spectra, we expect you to proceed with your seismic evaluation program. Based upon input that we have received from the Lawrence Livermore Laboratory / TERA Corporation Site Specific Spectra Project, the Systematic Evaluation Program licensees, NRC consultants and other sources, we have concluded that the ground response spectra shown in the Attachment 1 is an appropriate level at which to initiate your evaluations. Between now and the end of 1980 we clan to complete additional work that will allow us to finalize our decision.
It does not a ear likely that the ground response spectra shown 800811006/
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AUG 0 4 ;980 Mr. D. Louis Peoples in Attachment I will be modified to a large degree. Therefore, we strongly recommend that you use this ground response spectrum in your evaluations.
The bases for our decision are documented in Attachment 2.
You are free to make an alternative proposal for use in the interim until the final NRC staff decision is made. We must emphasize that taking such an approach involves increased risk on your part because certain evaluations may have to be redone at a later time.
Furthermore, limitations of NRC staff resources make review of. alternative proposals impossible in the near term.
In accordance with 10 CFR 50.54(f) of the Commission's regulations you are requested to submit the information described above on the dates indicated above in order to enable the Commission to determine whether or not your license should be modified, suspended or revoked.
- incerely, Division ofg se ire tor e
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.icensing Office of Nuclear Reactor Regulation
Attachment:
As stated cc: See next page
Mr. D. Louis Peoples cc Isham, Lincoln & Beale Director. Technical Assessment Counselors at Law Division One First National Plaza, 42nd Floor Office of Radiation Programs Chicago, Illinois 60603 (AW-459)
U. S. Environmental Protection Mr. B. B. Stephenson Agency Plant Superintendent Crystal Mall #2 Dresden Nuclear Power Station Arlington, Virginia 20460 Rural Route #1 Morris, Illinois 60450 U. S. Environmental Protection Agency U. S. Nuclear Regulatory Commission Federal Activities Branch Resident Inspectors Office Region V Office Dresden Station ATTN: EIS COORDINATOR RR #1 230 South Dearborn Street Morris, Illinois 60450 Chicago, Illinois 60604 Susan N. Sekuler Assistant Attorney General Environmental Control Division 188 W. Randolph Street Suite 2315 Chicago, Illinois 60601 Morris Public Library
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1 604 Liberty Street Morris, Illinois 60451 Chai rman Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 Department of Public Health ATTN: Chief, Division of Nuclear Safety 535 West Jefferson Springfield, Illinois 62761
0 ATTACHMENT 1 DRESDEN 1000.0 N
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D. Crutchfield, Acting Chjef Systematic Evaluation Program 3 ranch THRU:
James P. Knignt, Assistant Director for
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Rcbert E. Jackson, Chief Gecsciences Scancn, CE SU3dECT:
INITIAL REVIE*J AND RECCtHE.510ATIONS FCR SITE SPECIFIC SPECUA AT SEP SITES
'We have been working for the past two years with the SEP 3 ranch and their consultants in order to provide preliminary rec:mendations regarcing site specific spectra to be used in the SEP for evaluatien of the seismic design adequacy of the selected plants.
The 3rinch reccmendations are attached, however, it shcuid be noted that they are subject to the limitations described in the sections entitled "Pur;csa and Scccei' and" Rec =endations." These recer:r:endations were prepared by Dr. Lecn Reiter based primarily on documents submitted in the Site Scecific Spectra Program. We ex:ect that cur evaluation of items still forthe: ming in the Site Specific Spectra Program may result in the following:
1.
It is likely that there will be further changes in the return periods associated with the rec mended spectra for the various sites. These return periods will still be able to be described as "of the order of ICCO cr 10,000 years", which is the present descristien of the spectra and the level implicitly accepted by NRC in recent licensing decisions.
2.
There will be no major change in the relative levels of seismic hazard between sites.
3.
There will be little or no chacge in the ":eterministic" ccmcarisens for the varicus site used to evaluate the accectability of the spectra rec mended in the attached review.
There is a preliminary indication that a recuction in spectra at inter-mediate and low frequencies may be called for at rock sites (Cresden, Ginna, Haccam Neck and Millst:ne). Probabilistic precictions of :eak velocities at these sites may also be affected.
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