ML19249C169
| ML19249C169 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/20/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 7909070529 | |
| Download: ML19249C169 (1) | |
Text
Tfc
[ya nic oqh UNITED STATES y*).,c ( j NUCLEAR REGULATORY COMMISSION REGION 1 g ',, J b'[/. *
- 7. -
[
631 PARK AVENUE 4,
,d KING OF PRUSSIA, PENNSYLVANIA 19406 C#
AUG 2 0 ISH Docket No. 50-271 Vermont Yankee Nuclear Power Corporation ATTN:
Mr. Robert H. Groce Licensing Engineer 20 Turnpike Road Westborough, Massachusetts 01581 Gentlemen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Supplement No. 1, which clarifies NRC positions on actions requested with regard to your power reactor facility (ies) with an operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, f],W /ktk.8 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:
W. F. Conway, Plant Superintendent Ms. J. Abbey, Technical Secretary A. Z. Roisman, Natural Resources Defense Council 790907ost3 u,
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-02 Revision No. 1 (Supplement No. 1)
Date:
August 20, 1979 Page 1 of 2 PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circur, stances:
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 npports due to as-built problems, under design, base plate flexibility, o at ar bolt deficiencies.
In the reviews for system operability of the Duane Arnold and Crystal River facilities, criteria have beer, developed by th-EC staff that define pipe support operability.
The uiteria have been applied ir lieu of other analysis or evaluatic, Specifica',1y, the licensees identified problems with pipe supports in which the orii,inal design factors of safety were not met but some lesser margin was availaK e.
The design margins of four or five are intended to be final design ard ina yllation objectives but systems may be classed as operable on an lnterim basis with some lesser margin providing a program of restoration to at least the Bulletin factors of safety has been developed.
Facilities which fill cutside the operability criteria are considered to probebly require a Tecnnical Specification exception and will require review on a case by case basis.
Action to be Ta b n by Licensees:
For the following two cases, plant operation may continue or may begin:
For the support as a unit, the factor of safety compared to ultimate a.
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 a;pliec
@y graded to design margins of safet JDUPLICATE DOCUMENT supports and by the next refuelir H is as defi:.ed in Bulletin No. 79-1 Entire document previously entered tnose areas of the plant which ct into system under:
l ANO 7 O 37b O/h4 1
s t) /
'd I No.
- f pages
q ma mmaa, 1
- -