ML19249B966
| ML19249B966 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 08/22/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Weigand J GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 7909070158 | |
| Download: ML19249B966 (1) | |
Text
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f UNITED STATES 8# 3. cf,L NUCLEAR REGULATORY COMMISSION l jd! E REGION IV
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5 Gil RYAN PLAZA DRIVE. SulTE 1000 AR LINGTON, T E X A3 76012 August 22, 1979 In Reply Refer To:
RIV Docket Nos.
50-458/IE Eulletin No. 79-02 Rev. 1, Supplement 1 50-459/IE Bulletin No. 79-02 Rev. 1, Supplement 1 Gulf States Utilities Attn:
Dr. J. G. Weigand General Manager, Nuclear Projects Post Office Box 2951 Beaumont, Texas 77704 Gentlemen:
Enclosed is IE Lulletin 50. 79-02, Revision 1, Supplement No.
1, which is forwarded to you for information. No written response is required.
If you desire additional information regarding this ratter, please contact this office.
Sincerely, t
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t Ll k,arl5l.Seyfritt c~Aw' w
Director L
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 2.
List of IE Bulletins Issued in Last Six Months 7
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1909070I
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEFENT WASHINGTON, D.C.
20555 IE Bulls 5.n No. 79-02 Revision No. 1 (Supplement No. 1)
Date:
August 20, 1979 Page 1 of 2 PIPE O PCP.T 3ASE FI).TZ DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Descrict:ca of Circumstances:
The surp;e=ent to IE Eulletin No. 79-02 is intended to establish criteria for the evalua;;cn 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 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 conti r 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 providB
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$9/50/W j
No. of pages:
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