ML19249C149
| ML19249C149 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/20/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7909070496 | |
| Download: ML19249C149 (1) | |
Text
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'g UNITED STATES e
[ '* 3 e c ' j NUCLEAR REGULATORY COMMISSION REGION I h ; "[E G-0,.
631 PARK AVENUE
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,d KING OF PRUSSIA, PENNSYLV ANIA 19406 AU6 2 01979 Docket No. 50-423 Northeast Nuclear Energy Company ATTN:
Mr. W. G. Counsil Vice President - Nuclear P. O. Box 270 Hartford, Connecticut 06101 Gentlemen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Supplement No. 1, which is for-warded to you for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, h
N I
oyce H. Grier Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 2.
List of IE Bulletins Issued in Last Six Months cc w/encls:
K. W. Gray, Construction Quality Assurance Lead H. R. Nims, Director of Nuclear Projects J. F. Opeka, 5tation Superintendent J. R. Himmelwright, Licensing Safeguards Engineer 92128.1.
7 9 0 D 07 0 $'C/s.
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 IE Bulletin No. 79-02 Revision No. 1 (Eupplement No. 1)
Date:
August 20, 1979 Page 1 of 2 PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
The supplement to IE Bulletin No. 79-02 is intended to establish criteria for the evaluation of interim acceptability of plant operation with less than the design factors of safety for piping supports due to as-built problems, under design, base plate flexibility, or anchor bolt deficiencies.
In the reviews for system operability of the Duane Arnold and Crystal River facilities, criteria have been developed by the NRC staff that define pipe support operability.
The criteria have been applied in lieu of other analysis or evaluation.
Specifically, the licensees identified problems with pipe supports in which the original design factors of safety were not met but some lesser margin was available.
The design margins of four or five are intended to be final design and installation objectives but systems may be classed as operable on an interim basis with some lesser margin providing a program of restoration to at least the Bulletin factors of safety has been developed.
Facilities which fall outside the operability criteria are considered to probably require a Technical Specification exception and will require review on a case by case basis.
Action to be Taken by Licensees:
For the following two cases, plant operation may continue or may begin:
a.
For the support as a unit, the factor of safety compared to ultimate strengths is less than the original design but equal to or greater than two.
b.
For the anchor bolts the factor of safety is equal to or greater than two and for the support steel the original design factor of safety compared to ultimate strengths is met.
The above criteria may be applied prob ^ ' ""'"""
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graded to design margins of safety eQ DUPLICATE DOCUMENT supports and by the next refueling fc A
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