05000339/LER-1980-104-03, /03L-0:on 801218,w/unit in Mode 1,water Was Found Leaking from Weld Joint Connecting Vent Valve 2-CH-P-185 to Piping Into Suction Line of Charging Pump 2-CH-P-1B.Caused by Leak from Weld at Base of Valve.Weld Repaired

/03L-0:on 801218,w/unit in Mode 1,water Was Found Leaking from Weld Joint Connecting Vent Valve 2-CH-P-185 to Piping Into Suction Line of Charging Pump 2-CH-P-1B.Caused by Leak from Weld at Base of Valve.Weld Repaired

ML20002D356
Person / Time
Site:	North Anna
Issue date:	01/14/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20002D352	List: 05000339/LER-1980-104, Forwards LER 80-104/03L-0 05000339/LER-1980-104-03, /03L-0:on 801218,w/unit in Mode 1,water Was Found Leaking from Weld Joint Connecting Vent Valve 2-CH-P-185 to Piping Into Suction Line of Charging Pump 2-CH-P-1B.Caused by Leak from Weld at Base of Valve.Weld Repaired
References
LER-80-104-03L, LER-80-104-3L, NUDOCS 8101200452
Download: ML20002D356 (2)

LER-1980-104, /03L-0:on 801218,w/unit in Mode 1,water Was Found Leaking from Weld Joint Connecting Vent Valve 2-CH-P-185 to Piping Into Suction Line of Charging Pump 2-CH-P-1B.Caused by Leak from Weld at Base of Valve.Weld Repaired

Event date:
Report date:
3391980104R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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RC DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On December 18, 1980, with the unit in Mode 1, water was found leaking from a /

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weld joint that connects vent valve 2-CH-P-185 to piping that tees into the

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suction line of charging pump 2-CH-P-1B.

The leak was immediately isolated,

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charging pump 2-CH-P-1B was declared inoperable and an Emergency Maintenance

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Report was submitted. Since two charging pumps were operable the health and

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safety of the general public were not affected. This event is reportable

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pursuant to T.S. 6.9.1.9.d.

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SYSTEM

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VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/P/C/ (11) g/ (12) LC/ (13) /P/I/P/E/X/X/ (14) M/ (15)

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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER [B/ (18) LZ/ (19) LZ/ (20) g/ (21) /0/0/0/0/ (22) M/ (23) /N/ (24) /_A/ (25) /S/4/2/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27) i

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A weld at the base of a vent valve on the charging pump developed a leak.

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The weld was repaired per approved procedures.

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FACILITY METHOD OF

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/( ) DISCOVERY DISCOVERY DESCRIPTION (32)

STATUS

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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LOSS OF OR DAMAGE TO FACILITY G3)

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8 3 0 1 12 a fj M

Virginia Electric and Power Company North Anna Power Station, Unit #2

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 80-104/03L-0

Description of Event

On December 18, 1980, with the Unit in Mode 1, water was found leaking from a weld joint that connects vent valve 2-CH-185 to piping that tees into the suction line of charging pump 2-CH-P-1B.

Probcble Consequences of Occurrence Upon discovery of the leak the piping was isolated and charging pump 2-CH-P-1B was declared inoperable. Since there were two charging pumps operable the health and safety of the general public were not affected.

Cause of Event

The actual cause of a crack developing near the center of the weld material is unknown at this time. This crack may have been caused by improper fit-up of pipe to the socket weld fitting and by vibration from the charging pump.

Immediate Corrective Action

The leak was immediately isolated, charging pump 2-CH-P-1B was declared inoperable and an Emergency Maintenance Report was submitted.

i The weld was repaired and liquid penetrant inspected by approved welding procedures.

Scheduled Corrective Action None scheduled at this time.

Actions Taken to Prevent Recurrence None scheduled at this time.

Generic Implications We have experienced several failures of this kind recently and are investigating the cause of these welding failures.