ML19249B978
| ML19249B978 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 08/22/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Aswell D LOUISIANA POWER & LIGHT CO. |
| References | |
| NUDOCS 7909070173 | |
| Download: ML19249B978 (1) | |
Text
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UNITED STATES o.
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NUCLEAR REGULATORY COMMISSION n Q */ g t 3 ti, ;(5 7;,$.)/,. j REGION IV Gli RY Ar-J PLAZ A DRIVE, SulTE 1000 0,,
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c August 22, 1979 In Reply Refer To:
RIV Docket No.
50-382/IE Bulletin No. 79-02 Rev. 1, Supplement 1 Louisiana Power and Light Co.
ATTN:
Mr. D. L. Aswell Vice President of Power Production 142 Delaronde Street New Orleans, Louisiana 70174 Gentlemen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Suppleneat No.
1, which is forwarded to you for information. No written response is required.
If you desire additional information regarding this a ter, please contact this of fice.
Sincerely,
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Karl ". Seyfrit Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 2.
List of IE Bulletins Issued in Last Six Months c gf Of) 1909070
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 PIPt : rruR~ BASE FEAIE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Descrin;;ca of Circumstances:
The suppla-aat 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 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 desigr. 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 snme 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 c.nsidered to probably rat ire a Technical Specification exception and wil. require review on a case-by-case basis.
Action to be Taken by Licensees:
For the following two cases, plant operation may con'inue 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.
The above criteria may be applied provid[j'
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graded to design margins of safety exped[ DUPLICATE DOCUMENT and by the next refueling for nonaccessi i
fined in Bu'.letin No. 79-14 where " norma l Entire document previously entered of the plant which can be entered during i into system under:
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