ML19345A877

LER 80-029/01T-0:on 801103,during Suppression Chamber Mods to Make Weld fit-up,safety Relief Valve Line 1-3019E-8 Suffered 4-inch Crack at Pipe Penetration.Caused by Excessive Force.Pipe Will Be Repaired Before Startup

ML19345A877
Person / Time
Site:	Quad Cities
Issue date:	11/12/1980
From:	Kopacz J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345A875	List: ML19345A874 ML19345A877
References
LER-80-029-01T, LER-80-29-1T, NUDOCS 8011250358
Download: ML19345A877 (2)

Text

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REPORT OATE 7 8 60 et DOCKET NUMBER e8 69 EV ENT DATE EVENT DESCRIPTION ape 0 PROBABLE CONSEQUENCES h

lo l2l l During extensive Suppression Chamber modifications excessive movement was placed on l I Safety Relief Valve line 1-3019E-8" in order to make a weld fit-up. The movement l

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lo ;4; l resulted in a 4 inch long by 1/4 to 1/8 inch deep crack at the pipe penetration. l

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l o t s i l The probable consequences are minimal since the Auto-Depressurization System is l gl required only during reactor operation. l l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 g ] Construction personnel used excassive force on the pipe causing it to crack. The l

, gl pipe will be repaired before startup. The contractor was also supplied guidance on 1

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1. 'LER NUMBER: LER/R0 80-29/0lT ll. LICENSEE NAME: Commonwealth Edison Company i Quad-Cities Nuclear Power Station

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Ill. FACILITY NAME: Unit One

! IV. DOCKET NUMBER: 050-254

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j V. EVENT DESCRIPTION:

1 j On November 3,1980, Unit One was shutdown for a refueling and maintenance i outage. A portion of the work involved extensive modification to the suppression chamber. In order to make the weld fit-ups of the T quencher i spargers, excessive mechanical movement of the safety relief valve dis-charge lines was required. Noting this, the line w.periencing the maxi-mum motion was analyzed for that motion. Based on the results, a special examination was performed on the vent header penetrations using the magnetic particle method. During this inspection, a crack was found on line 1-3019E-8", discharge from the 1-203-3E electromatic relief valve j at the penetration. The crack was approximately 4 inches long, 1/8 to j 1/4 inch deep, and had a bright appearance.

, VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The Auto-Depressurization system is not required to be operable with the unit shutdown. Therefore, this occurrence had minimal consequences. All other penetrations were examined and no indications were found.

j Vll. CAUSE:

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Construction personnel used excessive force on the pipe causing failure in the area of highest stress. The penetration rigidly supports the pipe therefore, any force would concentrate near this point. On line

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1-3019E-8" the force used to make a proper weld fit-up was large enough to crack the pipe.

Vill. CORRECTIVE ACTION:

The crack will be repaired prior to the startup. . Therefore, the Auto-l Depressurization will be fully operable prior to startup. -The other 4

safety relief valves have been inspected and no cracks were found. A

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meeting was held with the contractor involved in which guidance on the allowable pipe movement limits to achieve proper fit-up was supplied.

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