ML20041F715

Final Deficiency Rept 82-03 Re Mechanical Snubbers in Close Proximity to Rigid Restraints Which Might Prevent Locking, Initially Reported 820209.Mechanical Snubbers Replaced W/Struts

ML20041F715
Person / Time
Site:	LaSalle
Issue date:	03/10/1982
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 3609N, NUDOCS 8203170326
Download: ML20041F715 (2)

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Commonwealth Edison

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/Firtt Nttional Ptna. Chic 1go, lilino(s t T" 7 Address Riply to: Post Offica Box 767 Chicago, Illinois 60690 March 10, 1982 9 W Mr. James G. 'Keppler, Regional Administrator '

Directorate of Inspection and 2 Enforcement - Region III RECrengm3 1 U.S. Nuclear Regulatory Commission (; -

799 Roosevelt Road -

MAR 161982n 3 Glen Ellyn, IL 60137 1( "Ey@fy

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Subject:

LaSalle County Station Units 1 an ; \

j Mechanical Snubbers in Close Proxi (

Rigid Restraints 10 CFR 50.55(e) Final Report #82-03 1

NRC Docket Nos. 50-373 and 50-374

Dear Mr. Keppler:

The purpose o f this letter is to provide the Final Report on Mechanical Snubbers in Close Proximity to Rigid Restraints. This report fulfills the 30 day reporting requirements o f 10 CFR 50.55(e).

Commonwealth Edison notified your office on February 9, 1982, of a deficiency in design in that approximately 113 snubbers were located in close proximity to rigid restraints and therefore might not lock up.

Commonwealth Edison Company's Project Engineering then determined that movements by the pipe o f 1/16" or less were of such small magnitude that the snubber would not engage. Using this criterio, a survey of all the snubbers at LaSalle was performed to determine which could be removed.

Accordingly, a total o f 182 mechanical snubbers required for Unit 1 operation were identified as being located in such proximity to rigid restraints that greater than 1/16" movement would not be permitted. These were identified on numerous design change documents and have all been replaced at LaSalle with struts. The 182 include both Unit 1 snubbers and Unit 2 snubbers required for Unit 1 operation.

The Unit 2 list has been identified, and will be completed prior to Unit 2 fuel load. Commonwealth Edison considers this report to fulfill the Final Report requirements o f 10 CFR 50.55(e) .

P203170326 820310 PDR ADOCK 05000373 kMR F 2 $gh hIA

o J. G. Keppler March 10, 1982 If there are any further questions concerning this matter, please contact this office.

Very truly yours, s 3 /o/B1 C. W. Schroeder 1m cc: NRC Resident Inspector 3609N