05000029/LER-1976-001-03, /03L-0:on 760204,slight Leakage from Charging Pump 3 Found in Two Areas,Relief Valve Discharge Flange & Pump Suction Tee to Valve Line Welds.Caused by Vibration Induced Fatigue Failure.Flange & Tee Replaced

/03L-0:on 760204,slight Leakage from Charging Pump 3 Found in Two Areas,Relief Valve Discharge Flange & Pump Suction Tee to Valve Line Welds.Caused by Vibration Induced Fatigue Failure.Flange & Tee Replaced

ML19345A464
Person / Time
Site:	Yankee Rowe
Issue date:	03/04/1976
From:	Janet Staub YANKEE ATOMIC ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345A463	List: 05000029/LER-1976-001, Forwards LER 76-001/03L-0 05000029/LER-1976-001-03, /03L-0:on 760204,slight Leakage from Charging Pump 3 Found in Two Areas,Relief Valve Discharge Flange & Pump Suction Tee to Valve Line Welds.Caused by Vibration Induced Fatigue Failure.Flange & Tee Replaced
References
LER-76-001-03L, LER-76-1-3L, NUDOCS 8011210667
Download: ML19345A464 (2)

LER-1976-001, /03L-0:on 760204,slight Leakage from Charging Pump 3 Found in Two Areas,Relief Valve Discharge Flange & Pump Suction Tee to Valve Line Welds.Caused by Vibration Induced Fatigue Failure.Flange & Tee Replaced

Event date:
Report date:
0291976001R03 - NRC Website

text

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LICNSEE EVENT. REPORT.

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.14 15 25 26 30 31 32 WY N N CAftCCaf OOCKET NUMR(R EVENT DATE REPORT DAff c i CON T l l

l W W l Ol SI 01-l 0 l 0 l 219l l Ol' 2l 01 4l 1d l Ol 31 O! 41 7l tl 7 2 57 59 59 00 61 68 69 74 75 60 EVENT OESCRIPTION o

l Durine nomal operation the auxiliary operator noted slight icakage from the No. 3 l

7 89 80

@ l charging ptrap piping in two areas.: Relief valve discharge flange to piping weld, and l 7 89 80 BE I ptrno suction tee to relief valve discharge line welds.

Charging was transferred to l

7 89 80 50-29/76-1 l

0s I the No.1 Charging Ptunp. % is event is reported as Reportable Occurrence 7 89 83 nu lin accordance with Technical Specification Section E.2.b.2.

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CAUSE OESCRIPT ON ae l ne apparent cause of the two weld cracks was vibration induced fatigue failure caused l 7 89 60 '

l M l by continuous operation of the positive displacement charging pump. D e flange and l

7 89 60 M l tee were replaced in kind and Icak tested satisfactorily.

Due to the repetitivncss l

60 taCr TV uttoOO 07 STATUS

% POWEA OTHER STATUS O!SCOVERY OfSCOvtAf O!SCAPTON J

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1 7 8 9

10 12 13 44 45 46 80 ACTMT V CONTENT OF A!Lf ASE l Air < 3.0E-10 Beta l

lPABCubicicAreaVentedViaPrimaryStackl Fif(EAEEO AVOUNT OF ACTMTV tOCATCN OF RELEASE 12 l Ll W

7 8 9

10 11 44 45 80 PERSONNEL EXPOSURES NUMBEA TVAE DESCA'pTCN 13 l 01 Ol (( Q l NA l

7 89 11 12 13 80 PERSONNEL INJUR:ES l l

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14 7 89 11 12 60 OFFSITE CONSEOUENCES E l leakace contained within Cubicle Area and vented via monitored Primary Vent Stack l

7 89 so,

LOSS OR DAMAGE TO FACfLITY TYPE CESCE>fCN L7J l NA I

7 89 10 80 PUBLICITY H l NA l

7 09 80 ADOITIONAL FACTORS 80 3 3 n 3 o66 7

@ buse Ibscription (contd.) of this occurrence, the plant is investigating installing 'l 7 89 L0 g ja pulsation damper on the charging ptCap discharge.

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' NRC DISTRIBUTION FOn PART 50 DOCKET MATERIAL REPORT a

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FROM: YAMMEE ATOMIC ELECTRIC C0 DATE OP OOCUMENT RO'.lE, MASS 3 - Q-7L

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[ COPY DEsCRIPTlCN ENCL O',U RE LTR TR,0!S THE FOLLO'..'II:G..

LICENSEE EVENT REPORT 50-29/76-1/3L Of!

2 4-76 RE HELD CRACl:S. CAUSED BY C0;dINUOUS OPERATIOjOFTHEPOSITIVE. DISPLACEMENT CHARGING PU:!P..

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PLAhT NAME: YANKEE RO'.-lE NOTE:

IF PERSONNEL EXPOSURE IS INV0'.NED SEND DIRECTLY TO KREGER/J. COLLINS SAFETY FOR ACTION /lNFORMATION ENVIRO 3 - ti

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