ML19253A505
| ML19253A505 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 08/22/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Short T OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7909100175 | |
| Download: ML19253A505 (1) | |
Text
- / a aeog%
m UNITED STATES CENTRAL FILES
$.%.f. (h.,E E
NUCLEAR REGULATORY COMMISSION PDR:HQ h
//
REGION IV 6, ' L..
/g 611 RYAN PLAZA DRIVE, SUtTE 1000 I
% ' N +"
,o ARLINGTON, TEX AS 7G012 U3IC August 22, 1979 Docket No.
50-285 0,nha Public Power District ATTN:
T. E. Short, Assistant General Manager 1623 Earney Street Omaha, Nebraska 68102 Centlesen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Supplement No. 1, which clarifies NRC positions on actions requested with regard to your power reactor facility with an operating license.
Should you have any questions regarding this Sulletin or the actions required by you, please contact this office.
Sincerel
/
ft
,__W5 4'
Karl V. 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 cc:
R. L. Andrews, Manager Fort Calhoun Station Post Of fice Box 98 Fort Calhoun, Nebraska 68102
.7 90910017 6~
P
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 20s 1979 Page 1 of 2 PIPE SUPPORT EASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Descrip ton of Ci.:cumstances:
The supplement to IE Bulletin No. 79-02 is intended to establish criteria for the evalua non of interim acceptability of plant operation with less than the design hctor : of safety for piping supports due to as-built problems, under design, base plate flexibility, or auchor 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 probl. ems 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 i The above criteria may be applied pro DUPLICATE _ DOCUMENT graded to design margins of safety ex ce,_,,
and by the next refueling for nonacce Entire document Sly entered V
fined in Bulletin No. 79-14 where "no into system under' of the plant which can be entered dur 7 9 o 8/5 o/ W ANO No. Of pages:
h
-