ML20074A607

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Interim Deficiency Rept Re Problem Involving Embedded Plates in Primary Shield Wall W/Deformed Wire Anchors Missing or Welds Between Plate & Anchor Being Cracked.Initially Reported on 820818.Caused by Axial Tensile Stresses
ML20074A607
Person / Time
Site: Marble Hill
Issue date: 05/09/1983
From: Shields S
PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, S82-21, SUP-0091-83, SUP-91-83, NUDOCS 8305130207
Download: ML20074A607 (2)


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PUBLIC SERVICE INDIANA S. W. Shields May 9, 1983 senior vice President - S82-21 Nuclear Division SVP-0091-83 Mr. James G. Keppler, Docket Nos.: STN 50-546 Regional Administrator STN 50-547 U. S. Nuclear Regulatory Commission Construction Permit Nos.:

Region III CPPR - 170 799 Roosevelt Road CPPR - 171 Glen Ellyn, Illinois 60137 Marble Hill Nuclear Generating Station - Units 1 and 2

Dear Mr. Keppler:

On August 18, 1982, Mr. T. D. Geib of Public Service Company of Indiana, Inc. (PSI) notified your office of a potentially reportable item as required by 10 CFR 50.55(e). This problem involves embedded plates in the primary shield wall having deformed wire anchors missing or the welds between the plate and anchor being. cracked. These plates had been installed prior to the cessation of safety related work in August, 1979.

1 Tests performed by an independent laboratory to determine the failure mode of the cracked welds have been completed and the results analyzed.

The results of these tests indicate that an axial tensile stress applied to the welds was the primary cause of failure. PSI is now working to determine the source of the stress.

This letter is intended to fulfill the requirements of an interim report as defined in 10 CFR 50.55(e). A further report will be filed on or before September 2, 1983. If you have any questions regarding this matter, please contact me at your convenience.

Sincerely, 1

S. W. Shields SWS/LGY/bak 0305130207 830509 Q gDRADOCK 05000546 PDR \h MAY 1 1 1983 P. O. Box 190, New Washington, Indiana 47162 812. 289.3000

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4 PUSUC' SERVICE

'""#"# May 9, 1983 Letter: J. C. Keppler '

S82-21 SVP-0091-83 cc: Director of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 J. E. Konklin J. F. Schapker 4

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