05000029/LER-1976-002-03, /03L-0:on 760210,auxiliary Operator Noted Leak in Weld on Reducer Discharge Header of Charging Pump 3.Caused by Vibration Induced Fatigue Failure,Due to Continuous Operation of Displacement Charging Pump

/03L-0:on 760210,auxiliary Operator Noted Leak in Weld on Reducer Discharge Header of Charging Pump 3.Caused by Vibration Induced Fatigue Failure,Due to Continuous Operation of Displacement Charging Pump

ML19345A491
Person / Time
Site:	Yankee Rowe
Issue date:	03/10/1976
From:	Janet Staub YANKEE ATOMIC ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345A490	List: 05000029/LER-1976-002, Forwards LER 76-002/03L-0 05000029/LER-1976-002-03, /03L-0:on 760210,auxiliary Operator Noted Leak in Weld on Reducer Discharge Header of Charging Pump 3.Caused by Vibration Induced Fatigue Failure,Due to Continuous Operation of Displacement Charging Pump
References
LER-76-002-03L, LER-76-2-3L, NUDOCS 8011210742
Download: ML19345A491 (2)

LER-1976-002, /03L-0:on 760210,auxiliary Operator Noted Leak in Weld on Reducer Discharge Header of Charging Pump 3.Caused by Vibration Induced Fatigue Failure,Due to Continuous Operation of Displacement Charging Pump

Event date:
Report date:
0291976002R03 - NRC Website

text

CONTROL BLOCK:l l

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l (PLEASE CH NT ALL RETUCES INFZMAT8C!2]

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tcENSE P.UVSER E

T PE Nave lM l A l Yl KjR 11 l-l0 D l-l0 l0 l0 l0 l0 l-D D j l4 l1 l1 l1l1l f$l o1 d5 26 30 31 32 7 89 14 15 T7P OCCKET NUVBEA EVENT CATE AEPORT DATE c i CONT I I

I LLJ LLJ 10 i s 101-I 010l 219l l0 l 2 l1l 017l 6l 10131110l7161 CATEGCAY SU 7 8

$7 58 59 60 61 68 69 74 75 80 EVENT DESCR PTiON

@ l Durine nor 11 oneration the Auxiliarv Operator noted a leak in the weld on a 2-1/2 in.l 89

@ lto 1-1/2 in reducer on discharge header of No. 3 charging numn.

Charging was l

7 7 89 This event l

@ l transferred to No.1 charging pump and No. 3 charging pump was isolated.

@ l is reported as Renortable Occurrence No. 50-29/76-02 in accordance with Technical l

7 89 7 85 l

i Snecifwation Section E.2.b.2.

aie 7 89 pqvg COMCONENT COMPONENT systru

CAUSE

CODE COJE COMPONENT COCE SJPPUEA MANUFACTUAEA

%101.ATON lPlCl W l Pl Il Pl El N Xl lAl l Zl 9l 9l 9l y

c7 7 89 10 11 12 17 43 44 47 48 CAUSE DESCR:PTION l 'Ihe apnarent cause of the weld crack was vibration induced fatique failure caused by l ae l continuous operation oE the positive displacement charging pump. The weld defect was l 7 89 a

80 l renaired, radiorrached and 'wdro tested satisfactorily prior to return to service.

l 7 8S 1o 80 VETHCD CF sm;, S

% S0.vEn OTHER STATUS D:5COVEAf DSCOVEAy CESCA'PTION satuTv y

l01719l l NA l

l Al lRoutineOperatorInspection l

i

/ 8 9

10 12 13 44 45 46 SO LOCATON OF AELEASE 12 lL l l MlEE!l Air = 3 5E-11 l

lPAB Cubicle Area Vented Via Primary Stacid EE30 08 AMOUNT OF ACTMTV 80 7 8 9

10 11 44 45 PER50NNEL EXPOSURES NUVet A Tvci O ES C A.D TCN I

!01 OLJJ l

l I NA 13 80 7 89 11 12 13 PERSONNEL INJU:. E5 I

LVMA C E S:: : TON l ol el d I NA i-7 89 11 12 OFFSITE CONSEGUENCES l Leakage contained within cubicle area and vented via monitored primary vent stack l

l 1e 80 7 89 LOSS OR O A'.i AGE To FAC:UTY l

Tv E CEsto pTec'.

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.'IA 1

7 89 10 FUBUCITY l

~7 l NA 60 7 89 ACD:TiCNAL facie:S lCause Descrition (contd.)

Due to the repetitiveness of this incident, the plant has l

1e 80 7 89 l prepared a design change to install pulsation dampeners on the charging pump discharge.]

39 80 7 89 J.L. Mas pgang;413-625-6140 navg.

GPO 8SI-467 8 012 2 ro 7M

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~1 U.S. NUCLE A9 REGULATORY COMM DOCKET NUM!ER i kRC Fcou 195 b}N 50-29 n. m

~ NPC DISTRl3UTION FOR PART 50 DOCKET M ATERI AL

"'jCIDE yg REPORT FRoM: Yankee Atomic Elec. Co.

DATE OF DOCUMENT 70; J.P.0" Reilly Rowe, Mass.

3-10-76 H.A. Autio o4TE RECEivEo 3-12-76 O LE TTE R O N OTO R'2 E D PROP INPUT FOR8A NUMBER OF CCPIES RECEIVED C ORIGIN AL Q UNC L AS$lF I E D QCOry 1

E N C LOSU R E DESCGlPTION Ltr. trans the following.......

Licensee Event Report # 76-9,. on.2-6-76, Concerning Reactor Recirculation pump"B" tripping.......

(1 Cy Received)

+

4 PLANT NAF.E:

Yankee Rose NOTE:

IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J. COLLINS

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