ML20028E651

Final Deficiency Repts 82-10 & 11 Re Rigid Strut Pins Mfg by Elcen.Initially Reported on 821223.Test Results Indicate No Load Capacity Data Values Violated.If Such Pins Were Used,Design Margins Not Exceeded

ML20028E651
Person / Time
Site:	Byron, Braidwood, LaSalle, 05000000
Issue date:	01/21/1983
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 5854N, NUDOCS 8301280084
Download: ML20028E651 (2)

Text

l

1. N Commonwealth Edison

. [c ) one First N tionsi Pktza. Chicago, litinois kO Addrzss R: ply to: Post Office Boi767 Chicago, Illinois 60690 January 21, 1983 Mr. James G. Keppler, Regional Administrator Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Commonwealth Edison Company Elcen Rigid Strut Pins LaSalle Unit 2, 10 CFR 50.55(e)

Final Report # 82-11 Byron Units 1 & 2, 10 CFR 50.55(e)

Final Report # 82-10 Braidwood Units 1 & 2, 10 CFR 50.55(e)

Final Report # 82-10 NRC Docket Nos. 50-373, 374, 454, 455, 456, and 457'

Dear Mr. Keppler:

Commonwealth Edison notified your office on December 23, 1982 of a potential reportable deficiency in accordance with 10 CFR50.55(e) concerning rigid strut pins manufactured by Elcen, The purpose of this letter is to provide you with the required 30 day written report on this subject.

Because of a material traceability problem identified at our Dresden and Quad Cities Stations with Elcen rigid struts, Commonwealth Edison initiated a testing program on Elcen strut material. Although ITT Grinnel Corporation furnished the piping supports at our LaSalle Station, Elcen did supply some material as a sub-vendor.

The initial test results indicated a potential problem with Elcen strut pins. On the basis of the initial test results for the Dresden and Quad Cities material, the 10CFR50.55 (e) notification was made for LaSalle County Station, Byron Station, and Braidwood Station.

The results of this initial testing which had identified certain lower yield strength pins have been reviewed. The test results are such that no "LCD" (Load Capacity Data) values are violated. Therefore, if such non-traceable pins had'been used in safety related applications, in our judgement, the design margins would not have been exceeded.

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Since the 10CFR50.55(e) notification, Edison has conducted

" Proof Loading of Hanger and Pin" tests. Additional material from Dresden and Quad Cities have been tested in a tensile test machine.

The additional material was tested at 5 times the hanger's design load for approximately 5 minutes. After testing, the hanger load pin was inspected and no deformation of pin material was observed.

The load pin is not considered to be the critical hanger component.

In addition for the Byron and Braidwood projects, a survey of ASME Section III traceable pins was conducted on January 14 through 18, 1983. No pins tested were found to have low yield strength by either Commonwealth Edison or Elcen's testing contractor.

Commonwealth Edison Company considers the technical aspects of this issue closed for all of our stations. The initial materials traceability documentation question at Dresden and Quad Cities Station is continuing to be pursued by Commonwealth Edison Company Quality Assurance Department.

To the best of my knowledge and belief the statements contained herein are true and correct. In some respects these statements are not based on my personal knowledge but upon information furnished by other Commonwealth Edison employees. Such information has been reviewed in accordance with Company practice and I believe it to be reliable.

If there are any questions concerning this subject please contact this office.

Very truly yours, V ( cn C. W. Schroeder rl2If B3 l Nuclear Licensing Administrator l cc: NRC Resident Inspector - LSCS NRC Resident Inspector - Byron NRC Resident Inspector - Braidwood NRC Resident Inspector - Zion NRC Resident Inspector - Dresden j NRC Resident Inspector - Quad Cities 1

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