05000373/LER-1982-129-03, /03L-0:on 821018,condensate Leak Discovered in Heater Bay Between Heaters 13c & 14c.Caused by Crack in Socket Weld of High Vent 1CB027C.Valve Cut Out & Replaced

/03L-0:on 821018,condensate Leak Discovered in Heater Bay Between Heaters 13c & 14c.Caused by Crack in Socket Weld of High Vent 1CB027C.Valve Cut Out & Replaced

ML20028B159
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
ML20028B154	List: 05000373/LER-1982-129, Forwards LER 82-129/03L-0 05000373/LER-1982-129-03, /03L-0:on 821018,condensate Leak Discovered in Heater Bay Between Heaters 13c & 14c.Caused by Crack in Socket Weld of High Vent 1CB027C.Valve Cut Out & Replaced
References
LER-82-129-03L, LER-82-129-3L, NUDOCS 8211300112
Download: ML20028B159 (2)

LER-1982-129, /03L-0:on 821018,condensate Leak Discovered in Heater Bay Between Heaters 13c & 14c.Caused by Crack in Socket Weld of High Vent 1CB027C.Valve Cut Out & Replaced

Event date:
Report date:
3731982129R03 - NRC Website

text

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]I On October 18, 1982 a condensate leak was discovered in the L.P. heater bay between j

gl heaters 13c and 14c. Cause of leak was a crack in the socket weld of high vent valve l g;

ICB027C.

The spill was contained in'the L.P. heater bay and routed via floor drains l g;

ti Radwaste.

The plant was at 28% PWR at the time of the occurrence.

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transferred to an alternate string and the defective string was isolated Safety of l g;

the plant, personnel and general public was mai-ntained at all times.

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]I The 'cause of leak was insuf ficient weld depth on the pipe to valve weld. The valve l

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LER HUMBER:

82-129/03L-0 11.

LASALLE COUNTY STATION: Unit i 111.

DOCKET NUMBER: 050-373 IV.

EVENT DESCRIPTION

On October 18, 1982, the Shif t Engineer was inforned of a condensate leak between L.P. heaters 13c and the in the Unit 1 L.P. heater bay. Upon closer investigation it was determined that the socket weld on the high point vent valve ICB027C upstream side was the cause. All leakage was contained in the area and routed to Radwaste via equipment floor drains.

A work request was ini tiated and L.P. heater string "C" was bypassed and isolated for repair.

V.

PROBABLE CONSEQUENCES:

At the time of the occurrence, LaSalle Unit I was at 28% power with the

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mode switch in run.

There are a total of 3 L.P. heater strings, each rated for 33% operation.

Only I L.P. heater string was required for 28% operation. This left 2 L.P. heater strings available and allowed for transferring to an alter-I nate L.P. heater string while isolating the defective string.

Thus plant operation was not affected at the lower power level for this reason.

The leak was discovered early, was contained in the L.P. heater bay, and sent to Radwaste via equipment drains.

Surveys performed indicated rad levels at spill area did not exceed 5 mrem /hr, and no airborne contami-nation was present.

Safety of the plant, the plant personnel and that of the general public was maintained at all times.

VI.

CAUSE

The cause of the occurrence was insufficient depth of the weld material on the valve to pipe weld.

Vil.

CORRECTIVE ACTION

On October 18, 1982 a work request (L19803) was initiated to correct the problem of the cracked socket weld.

Under this request the valve was cut out and new valve of the some manufacturer (Hancock, Dresser ind.)

was welded in place.

Even though the original valve was in fine working order it was replaced due to the fact that a more suitable weld prepara-tion could be obtained with a new valve vice the old valve.

Prepared by: Vincent Masterson