ML19276H499
| ML19276H499 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 11/08/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Weigand J GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 7911290028 | |
| Download: ML19276H499 (1) | |
Text
3\\ s
/" W
,pn aeog
'7
'o, UNITED STATES
[ '?p.. cq]' h NUCLEAR REGULATORY COMMISSION 3,@%(A[
W/
E REGION IV 0,
N,C 611 RYAN PLAZA oRIVE, SUITE 10C0 h,
,n' ARLINGTON, TEXAS 76012 November 8, 1979 In Reply Refer To:
RIV Docket Nos.
50-458/IE Bulletin Nc. 79-02, Revision 2 50-459/IE Bulletin No. 79-02, Revision 2 Gulf States Utilities Attn:
Dr. J. C. Weigand General Manager, Nuclear Projects Post office Box 2951 Beaumont, Texas 77704 Centlemen:
Enclosed is IE Bulletin No. 79-02, Revision No. 2 which requires action by you with regard to your power reactor facilities with an operating license or a construction permit.
Should you have any q.estions regarding this Bulletin Revision or the actions required by you, please contact this office.
Sincerely, Y Yahdt"fr Karl V. Seyfrit Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 2 2.
List of IE Bulletins Issued in Last Six Months 1A24 515
)
7911290 0
UNITED STATES SSINS No.: 6820 NUCLEAR REGULATORY COMMISSION Accession No.:
1 0FFICE OF INSPECTION AND EhTORCEMENT 7908220136 WASHINGTON, D.C.
20555 i.
IE Bulletin No. 79-02 Revision 2 Date: November 8, 1979 Page 1 of 7 PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS j
Description of Circumstances:
Inspection experiences and the review of licensee response have identified several R2 areas whers 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 and establish the NRC positions on minimum factors of safety, anchor bolt preload, R2 rnd the expected date of completion for certain Bulletin actions.
R2 Since the issuaNe of IE Bulletin No. 79-02 on March 8, 1979, IE inspection R1 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 deleted, R1 I
and the due date for completion of the requested actions (July 6,1979) has R1
}
not been changed. The following text supersedes the text of Bulletin 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 While performing inservice inspections during a March-April 1978 refueling outage at Millstone Unit i, structural failures of piping supports for safety equipment I
were observed by the licensee. Subsequent licensee inspections of undamaged l
supports showed a large percentage of the concrete anchor bolts were not tightened properly.
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 l
rigid plate assumptions has resulted in underestimation of loads on some anchor i
bolts.
Initial investigation indicate.d that nearly fif ty percent of the base plates could not be assumed to behave as rigid plates.
In addition, licensee inspection cf anchor bolt installations at Shoreham has shown over fifty percent of the bolt installations to be deficient.
Vendor Inspection Audits by NRC at Architect Engineering firms have shown a wide range of design practices and installation procedures which have been employed h -"---* +-
A-4-
- "4-d"-*~
for the use of concrete expansion ancha--
are toward more rigorous controls and bolts.
DUPLICATEDOCUMEN342 4,o The data available on dynamic testing fatigue failures can occur at loads s Entire document previously R1 2nd R2 - Identifies those addition entered into system under:
ANO No. of 1; ages: