ML19207C158
| ML19207C158 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/20/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7909070295 | |
| Download: ML19207C158 (2) | |
Text
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'o, UNITED STATES NUCLEAR REGULATORY COMMISSION 3,
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.e REGION 11 4
/" 2 101 MARIETT A ST., N W SUIT E 3100 j
AT LANT A, G EORGI A 30303 0
AUG 0 1979 In Reply Refer To:
50-404 50-405 Virginia Electric and Power Cor.pany AITN:
W. L. Pro! fit:
Senior Viet President, Fever P. O. Box 26666 Rictcond, VA 2 3.' t i Gentlemen:
Enclosed is IE Bulletin No. 79-02, Eivisien 1, Sq Tlcr. cat ';
.t i o is f a-warded to you for information.
N: written response is reyt ir:
If ycu derire additional infermation regarding thir, clatter, please contat tnis office.
Sincerely,
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James P. O'Reilly Director
Enclosures:
1.
IE Bulletin No. 79-02, 3,.s Revision No. 1 (Supplement No. 1) 2.
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Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 W. L. Stewart, Manager g
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6820 Accession No:
7908150164 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 20, 1979 IE Bulletin No. 79-02 Revision No. 1 (Supplement No. 1)
PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSI 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 whic operability.
the original design factors of safety were not met but some le tion.
installation objectives but systems may be classed as operable on an interim basis available.
with some lesser margin providing a program of restoration to at least theFac Bulletin 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-mate 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 two and for the support steel the original design factor of safety com-b.
pared to ultimate strenf,.wo
-a u-The above criteria may be ap) DUPLICATE DOCUMENT _
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ntered Pports graded to design margins of 4 Entire document previous y e and by the next refueling fo $into system under:
s fined in Bulletin No. 79-14 4 l
of the plant which can be en 7 g g f O / 6 c/
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No. of pages: _
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