ML19276H503
| ML19276H503 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 11/08/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Aswell D LOUISIANA POWER & LIGHT CO. |
| References | |
| NUDOCS 7911290033 | |
| Download: ML19276H503 (1) | |
Text
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ba UNITED STATES
[ma Stee,%
NUCLEAR REGULATORY COMMISSION O 1,N 't!
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REGloN IV 611 RY AN PLAZA DRIVE. SUITE 1000 7
c M f ARLINGTON, TEXAS 76012
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November 8, 1979 In Reply Refer To:
RIV Docket No.
50-382/IE Bulletin No. 79-02, Revision 2 Louisiana Power and Light Co.
ATTN:
Mr. D. L. Aswell cOULEilsii" ~J '
g Wi VicePresidentofPowerP{IU=LM s --.O I, k ' b3 U
142 Delaronde Street New 0.-leans, Louisiana 70174 Gentlemen:
Enclosed is IE Bulletin No. 79-02, Revision No. 2 which requires action by you with regard to your power reactor facility with an operating license or a construction permit.
Should you have any questions regarding this Bulletin Revision or the actions required by you, please contact this office.
Sincerely, SWt N Karl V. Seyfrit Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 2 2.
List of IE Bulletins Issued in Last Six Months 1424
'22 911200 o 3 3
UNITED STATES SSINS No.:
6820 NUCLEAR REGULATORY COMMISSION Accession No.:
l OFFICE (F INSPECTION AND ENFORCEMENT 7908220136 1
W.SHINGTON, D.C.
20555 i
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IF. Bulletin No. 79-02 l
Revision 2 Date: November 8, 1979 l
Page 1 of 7 i'
PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
Inspection experiences and the review of licensee response have identified several R2 l
areas where the Bulletin intent has not been adequately addressed by licensees.
R2 Revision No. 2 of the Bulletin is intended to clarify the intent of the Bulletin R2 I
and establish the NRC positions on minimum factors of safety, anchor bolt preload, R2 and the expected date of completion for certain Bulletin actiens.
R2 Since the issuance of IE Bulletin No. 79-02 on March 8, 1979, IE inspection R1 j
experience and many inquiries from licensees indicate that additional informa-R1 tion and clarification is needed.
This revision is intended to serve that R1 purpose. None of the requirements of the original Bulletin have been del.eted, R1
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and the due date for completion of the requested actions (July 6, 1979) has R1 t
not been changed. The following text supersedes the text of Bu'I stin No. 79-02.
R1 Changes from the original text are identified by R1, R2 in the margin. The pur-R2 pose of this revision is to identify acceptable ways of satisfying the Bulletin R1
~
requirements.
R1 l
While performing inservice inspections during a March-April 1978 refueling outage
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at Millstone Unit 1, structural failures of piping supports for safety equipment were observed by the licensee.
Subsequent licensee inspections of undamaged supports showed a large percentage of the concrete anchor bolts were not tightened properly.
I i
Deficiency reports, in accordance with 10 CFR 50.55(e), filed by Long Island I
Lighting Company on Shoreham Unit 1, indicate that design of base plates using rigid plate assumptions has resulted in underestimation of loads on some anchor bolts.
Initial investigation indicated that nearly f# ".y percent of the base i
plates could not be assumed to behave as rigid plates.
In addition, licensee inspection of anchor bolt installations at Shoreham has shown over fifty percent of the bolt installations to be deficient.
Vendor Inspection Aadits by NRC at Architect Engineering firms have shown a wice range of design pra'.tices and installation procedures which have been employed for the use of concrete expansion auch
~
are toward more rigorous controls and bolts.
DUPLICATE DOCUMENT The data available on dynamic testing l
fatigue failures can occur at loads s Entire docume nt previously entered into system under:
R1 and R2 - Identifies those additions
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ANO N o.
of pages:
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