05000318/LER-1980-012-03, /03L-0:on 800219,during Routine Surveillance,Small Leak Discovered on Charging Pump Common Suction Header Relief Valve.Caused by Vibration Induced Metal Fatigue in heat-affected Zone of Welded Penetration in Header

/03L-0:on 800219,during Routine Surveillance,Small Leak Discovered on Charging Pump Common Suction Header Relief Valve.Caused by Vibration Induced Metal Fatigue in heat-affected Zone of Welded Penetration in Header

ML19305C368
Person / Time
Site:	Calvert Cliffs
Issue date:	03/19/1980
From:	Davis S, Huseby D BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305C365	List: 05000318/LER-1980-012, Forwards LER 80-012/03L-0 05000318/LER-1980-012-03, /03L-0:on 800219,during Routine Surveillance,Small Leak Discovered on Charging Pump Common Suction Header Relief Valve.Caused by Vibration Induced Metal Fatigue in heat-affected Zone of Welded Penetration in Header
References
LER-80-012-03L-01, LER-80-12-3L-1, NUDOCS 8003260623
Download: ML19305C368 (2)

LER-1980-012, /03L-0:on 800219,during Routine Surveillance,Small Leak Discovered on Charging Pump Common Suction Header Relief Valve.Caused by Vibration Induced Metal Fatigue in heat-affected Zone of Welded Penetration in Header

Event date:
Report date:
3181980012R03 - NRC Website

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60 63 DOCK ET NUVSE R 68 69 E%ENT DATE 74

'S RESORT D ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10l2l l At 1800 while makino his rounds,.the Auxiliary Buildino Goerator discovered I

io i3 i I a small weld leak on the charging oump comnon suction header relief valve.

I l o I.311 The leak resulted in a deoradation of a systen desicned to contain radio-l 1

l o i s i l active fluids (T.S. 6.9.l.9.d). The leak was stoceed at accroxiratelv 2100.

I l0 is l I The ooerability of the charoino system was not affected by the leak.

LER's I

l o 17 I I 78-16 (U-1) and 78-18 (U-2) describe similar events.

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JJ 3b 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS IiioII This leak tas caused by vibration induced netal fatique in the heat-a'fected i

1 1i l I rone of a velded nenetration in the charoinq ourns' co v en suct4n ha= 6 r.

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,i iTj l was terrorarilv repaired by encaosulation and will he re-contiv eld ra,=irad 1

I i ! 21 l. hen plant conditions nermit.

A cherme has b?en initiated to rad :ce vibration I

i li i< l I in this line and install heavier walled nicino.

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. EVENT DATE 02/19/80

.'- REo0RT DATE 03/19/80 ATTACHMENT

,CAUSE DESCRIPTIOM AND CORRECTIVE ACTION:

The leak is in the heat-affected zer.e of the penetration weld of the 4

Charging Pump Suction Relief Valve (2-CV-311-RV). The relief valve is well supported by a hanger affixed to the adjacent vall, but the piping is supported to allow longitudinal novement. The result of this movement is flexing of the adjoining piping, leading to work hardening and fatigue failure. A Facility Change Request (FCR 79-1004)

I to install surge suppressors on the suction lines and to change the suction piping from schedule 10 to schedule 40 has been initiated.

It is expected that these modifications will correct this problem.

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