ML19253A506
| ML19253A506 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 08/22/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 7909100177 | |
| Download: ML19253A506 (1) | |
Text
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UNITED STATES PDR:HQ g
NUCLEAR REGULATORY COMMISSION R
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,e AHLINGToN TEXAS 76312 August 22, 1979 Docket No. 50-267 Public Service Company of Colorado ATIN:
Mr. C. K. Millen Senior Vice President P. O. 3or 840 Denver, Colorado 80201 Centle=en:
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 with an operating license.
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Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, f
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Karl V. Seyfrit
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k 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:
D. W. Warembourg, Nuclear Production Manager Fort St. Vrain Nucicar Station P.. O. Box 368 Platteville, Colorado 80651 L. Brey, Manager, Quality Assurance n.; ;y A u ta a v rJ2.
19091 00/77 p
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE dulletin No. 79-02 Revision No. 1 (Supplement No.1)
Date: August 20, 1979 Page 1 of 2 PIPE em RASE PT ATT DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Desc r m of Circumstances:
The sunplement 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 hPC staff that defines pipe support operability. The criteria has 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 ulti-mate 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 com-pared to ultimate strengths is met.
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The above criteria may be applied pro graded to design margins of safety ex DUPLICATE DOCUMENT _
gy p and by the next refueling for nonacce Entire document Previously entered fined in Bulletin No. 79-14 where "n of the plant which can be entered duri into system under:
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b No. of Pages: