05000254/LER-1979-012-03, /03L-0 on 790214:air Found Blowing Through Weld on 3/4 Inch Vent Line.Caused by Component Failure.Vent Line Inserted Into Sockolet & re-welded

/03L-0 on 790214:air Found Blowing Through Weld on 3/4 Inch Vent Line.Caused by Component Failure.Vent Line Inserted Into Sockolet & re-welded

ML19261C738
Person / Time
Site:	Quad Cities
Issue date:	03/12/1979
From:	Tietz G COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19261C735	List: 05000254/LER-1979-012, Forwards LER 79-012/03L-0 05000254/LER-1979-012-03, /03L-0 on 790214:air Found Blowing Through Weld on 3/4 Inch Vent Line.Caused by Component Failure.Vent Line Inserted Into Sockolet & re-welded
References
LER-79-012-03L, LER-79-12-3L, NUDOCS 7903280327
Download: ML19261C738 (2)

LER-1979-012, /03L-0 on 790214:air Found Blowing Through Weld on 3/4 Inch Vent Line.Caused by Component Failure.Vent Line Inserted Into Sockolet & re-welded

Event date:
Report date:
2541979012R03 - NRC Website

text

U. S. NUCLEAR HEGULAToRY CoMMISSloN

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LICENSEE EVENT REPORT dONTHOL BLOCK: [

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EVE *.T D ATE 14 75 REPORT DATE 80 EVENi DESCRIPTION AND PROS ABLE CONSEQUENCES h o

2 l While pressurizing the volume between MO 1-1001-50 and 47 for leak rate testing, I

ir was found blowing through a weld on a 3/4 inch vent line, line number 1-10102-3/4"1A.

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[ A visual inspection revealed two linear surface indications on the socko!et-to-vent o

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nch in length and 180 apart.

The conse-l i

line weld, each one was approximately one g

3 that the vent line is isolated l g quences of this occurrence are minimal due to the fact g

g when reactor pressure is greater than 100 psig.

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80 C O'.' P.

VALV E SYSTEM

CAUSE

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40 41 42 43 44 47 33 34 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l The cause of this occurrence is component failure. The root cause of the weld

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indication is unknown.

The defective fillet weld was ground out and the 3/4" vent I

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line was removed from the sockolet.

The bottom few inches of the vent line were l

, j g then cut-off.

The vent line was then inserted in to the sockolet and re-welded.

The l 3

new weld was dye penetrant tested and determined acceptable.

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% POWER OTHER STATUS ISCO HY DISCOVERY DESCRIPTION Test and insoection NA l

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LER NUMBER:

LER/R0 79-12/03L-0 11.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station 111.

FACILITY NAME: Unit One IV.

DOCKET NUMBER: 050-254 V.

EVENT DESCRIPTION

On February 14, 1979 while performing a local leak rate test on the MO 1-1001-50 and 47 Shutdown Cooling isolation valves, i t was noticed that the air pressure was decreasing rapidly.

An investigation of the pressurized volume revealed that air was blowing through a weld on a 3/4" vent line, line number 1-10102-3/4"-A.

The vent line is a stainless steel pipe, class 900 lb., ASTM specification A312 Grade TP304.

A visual inspec-tion of the 3/4" pipe revealed two linear surface indications on the sockolet-to-vent line weld, each one was approximately one Inch in length and 180 apart.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The consequences of this occurrence are minimal due to the fact that the vent line is located downstream of valve MO 1-1001-50, and by closure of valves MO 1-1001-47 and MO 1-1001-50 when reactor pressure is greater than 100 psig. The refo re,

any leakage from this line would be at a minimum.

Had a continuous leak occurred, the drywell floor drain sump level sould have detected the condition.

Vll.

CAUSE

The cause of this occurrence is component failure.

The root cause of the weld indication is unknown.

Vill.

CORRECTIVE ACTION

The corrective action performed was to grind out the defective fillet weld and remove the 3/4" vent ilne from the sockolet.

The bottom few inches of the vent line were then cut-off.

The vent line was then inserted into the sockolet and re-welded.

The new weld was dye penetrant tested and determined to be acceptable.

No further action was deemed necessary.

The re has been no previous occurrences of this nature on the RHRS piping.