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) .

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

l l l l 6

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

IO I1l8 9l Ml Dl 7

C l C [ Nl 114 l@l13 0 l 0 l - l 0 [LICENSE LICENSEE CODE l 0 l 0 l - 0 l 025l@l26 4 l1LICENSE 0 l 0NUMSER l1 l1TYPE l 1Jol@[57 CAT l

$8 lg CON'T o i REPO

, , g l JL g l 0 l 5 l 0 0l0l3l1l7 l@l 0 lEVENT 8[3 l1 l 7 l 9 ]@l 0lREPORT 9] 2lDATE 7l 719l@

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  !

7 8 9 80

~

D C SU COMPONENT CODE SU8 CODE SU DE 7

O 9 8

I 9

P l b lg hEg ll lEg l Pl Il Pl El Xl X[g gg g g to 11 12 13 13 20 19

_ SEQUENTIAL OCCUR R E NCE REPORT REVISION LE R/RO EVENT YE AR R EPORT NO. CODE TYPE N O.

@ &e,PO, 17 19 l l- 10 13 l9 l l/l 10l3l lL l-l ( 0_j

, 21 22 23 24 26 27 28 29 30 31 32 K N C ON ONP NT ME

• HOURS S 8 1 FOR 8. SUPPL ER MANUFAC RER lMZl@ 37l 0l 0l 0l 0l40 F

l33A lg[34_jg [5Z 3 _ jg l Yl@

di lNl@ lA l@ lSl0l310l@

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 @

L'_L7.J 101010 l@LZ_J@l NA 1172 9AO I

' * '

PERSONNEL thJuRIES NUMsER DESCRiPTiONh h la 'l 10 lo 10 "' l@l NA eI l

'

'gO, OR o4,,4C,E[0,4CitiTvg

,

7 91 0 0e 0 ) ' g a liIsl8 Z[@l 7 9 to NA 80 l

IS DE CRIPTION

• l 2101 dSUg @l NA l lIIllII IliIII,I 7 8 9 10 68 69 80 .

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

-