ML19249C062
| ML19249C062 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 08/20/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley M MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 7909070265 | |
| Download: ML19249C062 (2) | |
Text
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UNITED STATES g,
8 NUCLEAR REGULATORY COMMISSION
. f 101 MARIETTA ST., N.W., SUITE 3100 REGION 11 o,
f ATLANTA, GEORGIA 303C3
,e IV In Reply Refer To:
RII:JP0 50-416 50-417 Mississippi Power and Light Company AITN:
N. L. Starpley Vice President of Production P. O. Box 1640 Jackson, MS 39205 Gentlemen :
Enclosed is IE Bu11ctin Ne. 79-C2, Revision 1, Supple =ent 54 1, wh!ch is fer-warded to you for information.
No written respense is requittd.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
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j James P. O'Rei1[y Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 2.
Listing of IE Bulletins Issued in Last Six Months
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AUG 2 0 1979 Mississippi Power and Light Company cc w/ enc 1:
C. K. McCoy Plant Manager Post Office Box 756 39150 Port Gibson, Mississippi S
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SSINS: 6820 Accession No:
7908150164 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT MSHINGTON, D.C.
20555 August 20, 1979 IE Bulletin No. 79-02 Revision No. 1 (Supplement No. 1)
PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION 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 defines pipe support The criteria has been applied in lieu of other analysis or evalua-Specifically, the licensees identified problems with pipe supports in which operability.
tion.
the original design factors of safety were not met but some les available.
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 Facilities which fall outside the Sulletin factors of safety has been developed.
operability criteria are considered to probably require a Technical Specifica-tion 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:
For the support as a unit, the factor of safety compared to ulti-cate strengths is less than the original design but equal to or greater a.
than two.
For the anchor bolts the factor of safety is equal to or greater than b.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 (
DUPLICATE DOCUMENT graded to design margins of safety and by the next refueling for nona Entire document previously entered fined in Bulletin No. 79-14 where of the plant which can be entered lintosystemunder:
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l ANO No. of pages:
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