ML19257D657
| ML19257D657 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/04/1980 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-03-05.A, TASK-03-05.B, TASK-3-5.A, TASK-3-5.B, TASK-RR NUDOCS 8002050269 | |
| Download: ML19257D657 (3) | |
Text
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January 4,1980
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Docket No. 50-245 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
RE:
SYSTEMATIC EVALUATION PRCGRAM TOP *CS III-5. A (EFFECTS OF PIPE BREAK CN STRUCTURE, SYSTEMS AND COWONENTS INSIDE CONTAINMENT) AND III-5.B (PIPE BREAK OUTSIDE CONTAINMENT)
On September 12, 1979, representatives o' the Systematic Evaluation Program (SEP) licensees met with the staff and indicated their concern over uncertair.ty 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 fet inpingement loads are to be evaluated in impinged pipes.
The above points are essential elenents cf the referenced SEP Topics.
As a result, the SEP Branch, Division of :pera:ing Reactors, has had frequent meetings with the Mechanical Engineering Branch (MEB), Division of Systems Safety, to ensure that the position giver below is in agreement with current criteria used in evaluating plants under review for both Construction Pemits 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 ap:ly:
1.
A whipping pipe should be considered ca:able of rupturing impacted pipes of smaller nominal size.
2.
A whipping pipe should be considered ca:able of developing through wall leakage cracks in i.: acted pi:es c' equal or larger noninal sizes with thinner wall thicknesses.
1873 256 8002050 C
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 noninal sizes with equal or larger wall thicknesses.
Confimatory analysis is not required.
4.
The effects of jet impingrent 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,
00 OA wwa Dennis L. Ziema n, Chief Operating Reactors Branch #2 Division of Operating Reactors cc:
See next page 1873 257
Y Mr. W. G. Counsil January 4, icP.n cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN:
Assistant Director Counselors at Law Research and Policy One Constitution Plaza Devel ocnent Hartford, Connecticut 06103 Department of Planning and Energy Policy Anthony Z. Roisman 20 Grand Street Natural Resources Defense Council Hartford, Connecticut 06106 917 15th Street, N. W.
Washington, D. C.
20005 Director, Technical Assessment Division Northeast Nuclear Energy Company Office of Radiation Programs ATTN:
Superintendent
( AU-459)
Millstone Plant U. S. Environnental Protection P. O. Scx EO Agency Waterford, Connecticut 06385 Crystal ".all #2 Arlington, Virginia 20460 Mr. James R. Hinnelwright Northeast Ut'ilities Service Company U. S. Environmental Protection P. O. Box 270 Agency Hartford, Connecticut 06101 Region I Office ATTN:
EIS COORDINATOR Nuclear Regulatory Corr.ission, Regior. I JFK Federal Building Office of Inspection ar.d Enforcement Boston, Massachusetts 02203 ATTN: John T. Shedlosky 631 Park Avenue X M C, Inc.
King of Prussia, Pennsylvania 19406 ATTN:
Richard Schaffstall 1747 Pennsylvania Avenue, N. M.
Waterford Public Library Suite 1050 Rope Ferry Road, Route 156 Washington, D. C.
20006 Waterfo'rd, Connecticut 06335 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 1873 258