ML19209A100

LER 79-039/03L-0:on 790831,noted That Coolant Was Leaking from Discharge Valve & Weld on Discharge Drain Line of Charging Pump.Caused by Cracks in heat-affected Zones of Socket Weld.Pipe Spool & Valve Replaced

ML19209A100
Person / Time
Site:	Calvert Cliffs
Issue date:	09/27/1979
From:	Heibel R, Miernicki M BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209A097	List: ML19209A096 ML19209A100
References
LER-79-039-03L, LER-79-39-3L, NUDOCS 7910020355
Download: ML19209A100 (2)

Text

NRC FORM 366 U. S. NUCLE AR REGUL ATORY CO.'.iMISSION 4 77) .

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7 8 60 61 DOCKET NUM8ER 68 69 DATE 74 75 80 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES O'o O 2 l During nonnal plant operation the plant operator discovered that coolant was l

,,,3;  ; leaking from the discharge valve and a weld on the discharge drain line of l l o y, y ; number 11 charging pump. The pump was removed from service and the leaks o 3 isolated. Te redundant charging pumps remained in service throughout this I o o , event, (T.S.6.9.1.9.d) . Similar events are described in LERs 79-26 (U-1) and I o , ;77-75 (U-2). l 0 9 l  !

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS g l Leaks occurred due to cracks in the heat affected zones of a socket weld on 3/4" I i l charging pumo discharge drain line and a socket weld on 2" charaine cunn dhcharna I

, 2 I line. Pipe spool and valve were removed and replaced. Vibration of the line i

, 3 appears to have been the cause of leak. I u L4 l l 1 7 8 9

• 90 STA  % PCWER OTHER STATUS 015 O RY DISCOVERY DESCRIPTION l i I s l [E Jg l 1l 0 l 0 l@l NA l l8l@l Operator Observation l A!Tivity COETENT 8 REL AMOUNT OF ACTivlTY LOCATION OF RELEASE ITTs 1 l BASED l@ OF RELEASEZlgl NA l l NA l PERSO~ net ExPOSSES NuM8ER TvPE cESCRiPTiON @

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NAVE OF PREPARER R. P. Heibel/M. J. Piernicki necNE. (301) 234-7943/7962 2,

LER NO. 79-39/3L DOCKET NO. 50-317 REPORT DATE 09/27/79 EVENT DATE 08/31/79 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

A design modification is under review to install a larger pump discharge dampener and also a suction stabilizer to mini;nize vibration on system due to flow pulsations. (FCR79-1004).

e 1136 250

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