ML19289C848
| ML19289C848 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 01/15/1979 |
| From: | Stello V Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR NUDOCS 7901250300 | |
| Download: ML19289C848 (3) | |
Text
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UNITED STATES 3"
NUCLEAR REGULATORY COMMISSION f
WASHINGTON, D. C. 20565 O
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January 15, 1979 Docket No. 50-213 Connecticut Yankee Atomic Power Company ATTN: Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Post Office Box 270 Hartford, Connecticut 06101 Gentlemen:
RE: HADDAM NECK As part of the Systematic Evaluation Program (SEP) the NRC staff has completed a search of your docket for pertinent infomation related to the seismic design bases of your facility. We find that your docket lacks sufficient information concerning the seismic design input and structural capability for safety-related structures, systems and equip-ment to withstand earthquake effects to enable us to complete our evaluation.
As you know, the major NRC regulations dealing with seismic design are 10 CFR Part 50, Appendix A (General Design Criterion 2) and 10 CFR Part 100, Appendix A.
We recognize that both of these regulations were issued subsequent to the design of your facility. However, one of the objectives of the SEP is to compare the original design basis with current criteria. Currently, the information on the docket is not sufficiently complete to adequately address the potential hazard of earthquakes, nor to determine whether backfitting of additional seismic resistance would provide substantial atitional protection required for safety.
While the docket does not contain sufficient information on geologic and seismic input to allow a comparison to current criteria, seismic input information for your facility could be developed based on current criteria and a bounding conservative assessment; however, evaluation of various site specific response spectra methodologies may demonstrate a more realistic approach in determining seismic input. Staff effort in these methodologies is expected to lead to acceptable procedures for detemining site specific spectra. We encourage you to closely follow the progress of our work aimed at the development of a seismic input for your facility.
79012503ca
Common ealth Edison Company January 15, 1979 We recognize that your facility possesses inherent structural capabili-ties to withstand earthquake effects. However, there is insufficient info.1 nation docketed to adequately quantify such capability. We believe that a significant effort on your part may be required to assess the seismic safety margins of your facility. As we have discussed with your representatives, this issue can be most efficiently resolved within the time frame of the SEP by concentrating both of our resources on those areas of seismic design most important to safety HiiWwhere sufficient documentation of seismic resistance is not available. In this regard, the staff has assembled a group of recognized seismic design experts to help evaluate the seismic safety margins of your facility. This team will be utilized to identify siv ficant issues in tenns of overall plant safety in an effort to identify any items which may require further consideration and, if shown to be necessary, to limit the scope of any necessary evalu-ations.
Although we have undertaken substantial effort both in establishing a seismic input and in seismic design, we expect you to be responsible for a documented seismic design basis for your facility. This would include a seismic input as well as analytical or other procedures for demonstrating that acceptable structural design criteria are satisfied. The staff ex-pects to work with you in this effort, especially in the areas of definition of acceptable seismic structural design criteria and seismic input.
Your representatives have indicated your willingness to proceed with the cutlined program. As we have discussed with them, the planned site visit on February 21, 1979, during the upcoming refueling outage should provide an excellent opportunity for our team of seismic design experts to gain a first hand view of the facility. Prior to the visit, any information required to support this effort will be defined. The staff will contact you shortly with further details.
Si cerely, Victor Stel o, r., Director Division of Operating Reactors Office of Nuclear Reactor Regulation cc:
See next page
Connecticut Yankee Atomic Power Company January 15, 197P cc:
Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 061 03 Superintendent Haddam Neck Plant RFD #1 Post Office Box 127E East Hanpton, Connecticut 06424 Russell Library 119 Broad Street Middletown, Connecticut 16457 j
Mr. James R. Himmelwright Post Office Box 270 Hartford, Connecticut 06101 I
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