05000373/LER-1983-039, Updated LER 83-039/03X-1:on 830418,mechanical Snubbers R141-1060S Found Locked Between Hot & Cold Settings.Caused by Transient on Line 1R141BA-10,resulting in Water Flashing to Steam.Snubbers replaced.W/840320 Ltr

Updated LER 83-039/03X-1:on 830418,mechanical Snubbers R141-1060S Found Locked Between Hot & Cold Settings.Caused by Transient on Line 1R141BA-10,resulting in Water Flashing to Steam.Snubbers replaced.W/840320 Ltr

ML20087N156
Person / Time
Site:	LaSalle
Issue date:	02/21/1984
From:	Diederich G, Spencer D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-83-039-03X, LER-83-39-3X, NUDOCS 8404030170
Download: ML20087N156 (3)

LER-2083-039, Updated LER 83-039/03X-1:on 830418,mechanical Snubbers R141-1060S Found Locked Between Hot & Cold Settings.Caused by Transient on Line 1R141BA-10,resulting in Water Flashing to Steam.Snubbers replaced.W/840320 Ltr

Event date:
Report date:
3732083039R00 - NRC Website

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'l.' LER NUMBER: 83-039/03X-1

11. LASALLE COUNTY STATION: Unit 1 Ill. DOCKET NIMBER: 050-373 IV. EVENT DESCRIPTION:

During performance of Visual Inspections required by Technical Specification 3.7 9, mechanical snubber R141-1060S was found locked between its hot and cold settings. The snubber was located on line IRl41BA-10".

V. PROBABLE CONSEQUENCES OF THE OCCURRENCE: .

The affected piping was analyzed by Sargent and Lundy with the defective snubber modeled as a rigid restraint. No adverse stresses or loads occurred Therefore, on any piping or adjacent restraints as a result of this failure.

safe operation of the plant was maintained at all times. Health and safety of the public was not affected.

VI. CAUSE:

The failed snubber was dismantledThe and transient the causewas of failure causeddetermined by water intothe be a transient on line IRl41BA-10".

line being flashed to steam when valve 1E51-F064 is opened to initiate the Steam Condensing mode of Residual Heat Removal. This flashing, coupled with the large thermal movements normally experienced by the .line, caused forces and thermal movements greater than design. Snubber manufactured by Pacific Scientific.

Vll. CORRECTIVE ACTION:

The defective snubber was replaced under Work Request L24119 All other snubbers on lines 1Rl41BA,1Rl41BB and IRl41A were stroked and two similar failures found. These snubbers were replaced under Work Requests L30072 and L30073 All affected piping was analyzed as acceptable by Sargent &

Lundy. As a long term corrective action, Modification M-1-1-82-26 tracks the addition of a warming line around valve 1E51-F064.

Prepared by: Dale A. Spencer i

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-~N Comm:nw;;lth Edison

/ ) LaSalle County Nuclear Station

L, Rural Route #1, Box 220

\ / Marseilles, Illinois 61341

,/ Telephone 815/357-6761 March 20, 1984 James G. Kepple r Regional Administrator Region lil U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Sir:

Reportable Occurrence Report #83-039/03x-1 Docket #050-373 is being submitted to your office to supersede previously submitted Reportable Occurrence Report

1. 83-039/39L-0, in accordance with NUREG-0161, " Instructions for Preparation of Data Entry Sheets for Licensee Event Report (LER) File"; General Instruction No. 3 ed G. J . Diederi ch Supe ri n tenden t LaSalle County Station GJD/GW/kg Enclosure CC: Director of Inspection & Enforcement Di rector of Management Information & Program Control U.S. NRC Document Managernent Branch INP0-Records Center File /NRC MAR 2 6 5J84' ff D t}l