ML19249B972
| ML19249B972 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/22/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 7909070165 | |
| Download: ML19249B972 (1) | |
Text
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- [ W, 7 (gl h NUCLEAR REGULATORY COMM:SSION 3 [%/AM /S.ir, j REGION IV J
611 RYAN PLAZ A DillVE, SUITE 1000
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August 22, 1979 In Reply Refer To:
RIV Docket Nos. 50-498/IE Bulletin No. 79-02 Rev. 1, Supplement 1 50-499/IE Bulletin No. 79-02 Rev. 1, Supplement 1 Houston Lighting & Power Company ATTN:
Mr. E. A. Turner, Vice President Power Plant Construction and Technical Services Post Office Box 1700 Houston, Texas 77001 Gentlemen:
Enclosed is IE Bulletin No. 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 matter, please contact this office.
Sincerely,
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(w Karl V. Seyfrit 1 Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 2.
List of IE Bulletins Issued in Last Six Months I
I 7909070
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 SU PORT BASE PI_ m DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
The suppie=ent to IE Bulletin No. 79-02 is intended to establish criteria for the evaluatica of interim acceptability ot plant operation with less than the design factors of safety for piping supports due to as-built problems, under desigt, 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 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.
The above criteria may be applied provide
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graded to design margins of safety expedi DUPLICATE DOCUMENT and by the next refueling for nanaccessib fined in Bulletin No. 79-14 where " normal Entire document previously entered of the plant which can be entered during into system under:
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