ML20028B292

LER 82-130/03L-0:on 821019,leak Discovered in Socket Weld of Mechanical Seal Injection Line Valve for Condensate/ Condensate Booster Pump 1A.Caused by Cracked Weld Due to Vibrational Stress.Injection Line Replaced

ML20028B292
Person / Time
Site:	LaSalle
Issue date:	11/15/1982
From:	Masterson V COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028B291	List: ML20028B290 ML20028B292
References
LER-82-130-03L, LER-82-130-3L, NUDOCS 8211300255
Download: ML20028B292 (2)

Text

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I 8 60 61 COOKET % MBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h aill I On October 19, 1982, a leak developed in the mechanical seal injection line for "lA" 3j g g

,,,,g CD/CB pump. The pump was shutdown and the leak isolated. 3 out of 4 CD/CB remained l g ; 3, g operational maintaining 100I6 rated power capability if needed. Plant operation was  ;

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l .' LER NUMBER: 82-130/03L-0

11. LASALLE COUNTY STATION: Unit 1 111. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

On October 19, 1982, a small leak was discovered in the socket weld of the mechanical seal injection line valve for condensate / condensate booster pump "l A". The shift ordered "lC" CD/CB pump started and shutdown "1A" CD/CB pump. The leak was isolated and all leakage was contained within the pump room and routed to Radwaste via floor drains.

Work request (L19811) was written to repair weld on mechanical seal injection line booster side valve. ,

l V. PROBABLE CONSEQUENCES: j At the time of the occurrence the Reactor Plant was at 33% power with ,

the mode switch in run. There are 4 CD/CB pumps for Unit 1 of which l only 3 are required for 100% rated operation. Since only the "1A" CD/CB was secured and isolated this did not effect plant operation as the  !

other remaining pumps were operational. Thus plant operation was not J limited.

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No presence of airborne contamination was detected and all leakage was 4 contained in the pump room and sent to Radwaste via floor drains. Safe  !

operation of the unit was maintained at all. times and the safety and -

b health of the general public was not affected, VI. CAUSE:

The cause of the cracked weld was due to vibrational stress. The condensate / condensate booster pump system contains hard piping for the mechanical seal injection line. This was determined to be a design problem due to the vibration of the pumps causing the line to leak at .

welded connections. A modification was made to the existing mechanical seal injection piping replacing existing piping with flexible high pressure hose to alleviate the vibretion problem. The modification was in progress at the time and "lA" CD/CB was scheduled to have its mechanical seal injection line replaced when the Icak developed.

Vll. CORRECTIVE ACTION:

The "lA" mechanical seal injection line which developed the leak was replaced with the new high pressure flex hose, per modification under field change request, FCR L0197 The modification to mechanical seal injection lines for all CD/CB was completed. October 28, 1982.

Prepared by: Vincent Masterson

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