ML19257D238
| ML19257D238 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 01/04/1980 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-03-05.A, TASK-03-05.B, TASK-3-5.A, TASK-3-5.B, TASK-RR NUDOCS 8002010562 | |
| Download: ML19257D238 (3) | |
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,o Docket No. 50-213 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
RE:
SYSTEMATIC EVALUATION PROGRAM TOPICS III-5. A (EFFECTS OF PIPE EREAX ON STRUCTURE, SYSTEMS AND COMPONENTS INSILE CONTAINMENT) AND III-5.B (PIPE BREAK OUTSIDE CONTAINMENT)
On September 12, 1979, representatives of the Systematic Evaluation Program (SEP) licensees met with the staff and indicated their concern over uncertain y related to:
1.
The intent of footnote 14 to Regulatory Guide 1.46 and Section B.2.b.(2) of Branch Technical Position APCSB 3-1 (attached to Standard Review Plan Section 3.6.1) with respect to when pipe whip loads are to be evaluated in impacted pipes of nominal sizes equal to or greater than that of the postulated broken pipe; and 2.
The criteria with respect to when jet impingement loads are to be evaluated in impinged pipes.
The above points are essential elements of the referenced SEP Topics.
As a result, the SEP Branch, Division of Operating Renctors, has had frequent meetings with the Mechanical Engineering Branch (MEB), Division of Systens Safety, to ensure that the position given below is in agreement with current criteria used in evaluating plants under review for both Construction ?ermits and Operating Licenses.
It is the staff's position that when evaluating the pipe whip impact and jet impingement effects of postulated pipe breaks for SEP Topics III-5.A and III-5.B, the following criteria shall apply:
1.
A whipping pipe should be considered capable of rupturing inpacted pipes of smaller nominal size.
2.
A whipping pipe should be considered capable of developing through wall leakage cracks in impacted pipes of eoual or larger nominal sizes with thinner wall thicknesses.
1857 189 7
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Mr. W. G. Counsil January 4,1980 3.
A whipping pipe may be considered incapable of rupturing or cracking impacted pipes of equal or larger nominal sizes with equal or larger wall thicknesses. Confirmatory analysis is not required.
4.
The effe:ts of jet impingement loads should be considered and evaluated regardless of the ratio of impinged and postulated broken pipe sizes, even if evaluation for pipe whip impact is not required by criterion 3 above.
The staff will consider analytical and experimental justification for the use of less conservative criteria by the licensees on either a generic or case-by-case basis.
Si ncerely,
.m Mmvi Dennis L. Zierann, Chief Operating Reactors Branch #2 Division of Operating Reactors cc:
See next page 1857 190
Mr. W. G. Counsil January a,1980 cc Day, Berry & Howard U. S. Environmental Protection Counselors at Law Agency One Constitution Plaza Region I Office Hartford, Connecticut 06103 ATTN:
EIS COORDINATOR i
JFK Federal Building j-Superintendent Boston, Massachusetts 02203 Haddam Neck Plant RFD #1 K M C, Inc.
Post Office Box 127E ATTN:
Richard Schaffstall East Hampton, Connecticut 06424 1747 Pennsylvania Avenue, N. W.
Suite 1050 Mr. James R. Himmelwright Washington, D. C.
20006 Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Russell Library 119 Broad Street Middletown, Connecticut 06457 Board of Selectmen Town Hall Haddam, Connecticut 06103 Connecticut Energy Agency ATTN: Assistant Director Research and Policy Development Department of Planning and Energy Policy 20 Grand Street Hartford, Connecticut 06106 Director, Technical Assessment Division Office of Radiation Programs (AW-459)
U. S. Environmental Protection Agency Crystal Mall #2 Arlington, Virginia 20460 1857 191