ML19322A094
| ML19322A094 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 12/04/1978 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Martin T Public Service Enterprise Group |
| References | |
| NUDOCS 7901020215 | |
| Download: ML19322A094 (1) | |
Text
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UNITED STATES
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g NUCLEAR REGULATORY COMMISSION
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REGION I 2
631 PARK AVENUE KING OF PRUS$1A, PENNSYLVANIA 19406 s.....
Docket Nos. 50-354 DEC 0 41978 50-355 Public Service Electric & Gas Company ATTN:
Mr. T. J. Martin Vice President Engineering and Construction 80 Park Place Newark, New Jersey 07101 Gentlemen:
Subject:
c4 Failure of Nelson Studs (Your letter of November 22,1978)
Thank you for your letter, referenced above, which forwarded a final report pursuant to 10 CFR 50.55(e) regarding the subject matter.
Your report will be reviewed and evaluated, and should we require additional information concerning this matter, we will contact you.
Your cooperation with us is appreciated.
Sincerely, Robert T. Carlson, Chief Reactor Construction and Engineering Support Branch cc:
E. N. Schwalje, Manager - Quality Assurance, Engineering and Construction Department 790102 0;t/5 i
m ionus J. Martin -
Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430 8316
- e Pres. dent -
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November 22, 1978
'Mr.-Boyce H.
Grier, Director U..S.' Nuclear Regulatory Commission Office of Inspection and Enforcement Region 1
.631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr..Grier:
FAILURE OF NELSON STUDS
.10CFR50.55(e), "SIGINIFICANT DEFICIENCY" NO. 1 AND
'JN I TS HOPE CREE:
NERATING STATION On' October 26, 1978 a verbal report was made to Region 1, Office of Inspection and Enforcement representative, Mr.
S.
- Ebneter,
. advising-that a potential significant item regarding 1/2" Nelson
_ studs had been identified.
This verbal report was provided in accordance.with the provisions of 10CFR50.55(e).
The following supplemental information is hereby submitted pursuant to our initial report and in accordance with the requirements of 10CFR50.55(e):
1.
Description of the Deficiency:
During installation of embeds supplied by Acme Steel Engineering Company in a nonsafety re' lated area, several 1/2" Nelson studs were found to be defective.
An investi-gation was performed whereby approximately 500 studs on installed embeds (none of which were 1/2" size) in
-the safety related areas were tested and revealed no similar problem.
However, a shipment from Acme Steel in the laydown-area revealed a failure rate of approximately 15% for the 1/2." size.
It was determined by investigation that the defective 1/2" studs were welded.without an approved' procedure.
The amperage.being used during welding.was too low and the D.C.
lead was-incorrectly termina'ted to the power generator.
e Mr. Boyce'H. Grier, Dir. 11/22/78
-2.
Analysis of the Safety Implications:
Bechtel Engineering reviewed all embedded items with 1/2" Nelson studs supplied by' Acme Steel.
Their analysis was based on the conservative assumption of failure of all 1/2" Nelson studs'-identified to be installed.
It has been concluded that had this condition remained uncorrected and stud failure occurred on certain embedded items, the safety of operations could have adversely been affected.
~I 3.
Corrective Action:
Bechtel's Field Construction placed a hold on all saf'ety related concrete placements containing Acme Steel supplied 1/2" studded items.
Nonconformance Reports Nos. 368 and 369 were issued to identify the stored and installed embeds that are involved and a list was given to their engineering department for determination of safety implications.
The disposition and corrective action to be taken for the Nonconformance Reports is' scheduled to be completed and issued to the field by December 8, 1978.
Bechtel conducted an investigation at Acme Steel and initiated the following corrective steps:
1.
Acme weld procedure was updated to include 1/2" studs.
2.
Equipment Maintenance / Calibration Program per Nelson Stud Company instruction manual was initiated.
3.
Operator training and requalification was initiated to comply with requirements of AWS Dl.l.
4.
Bechtel's supplier representative was instructed to increase surveillance and add stud welding / testing operations as a' witness point to assure compliance to approved procedure and AWS D.l.1 until confidence is restored that Acme can supply satisfactory material with studs.
4.
Bethlehem Fabricators Inc. Supplied Material:
During receiving inspection of structural steel furnished by Bethlehem Fabricators, Inc.,_it was noted that the Nelson Steel Welds did not meet AWS requirements.
Further investiga-tion by bend testing studs on installed beams resulted in three of seven failures.
A full investigation into this problem has been completed and-it has been concluded that i
had.the. defective studs-identified remained uncorrected,
.th'ey would not have adversely affected the safety of oparations of'the' plant at any-time'throughout the expected-lifetime.
..... ~ -..
Mr. ;B'oy ce H.. ' Grier, Dir..- 11/22/78.
0
- If?youfrequire addit'ional'information, we will-be. pleased to diLscuss;it.with you.
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Very truly:yours, I-(
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John H.
Davis l-Bethesda, Maryland i-1 i
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