ML19320A072

RO 50-313/76-29:on 761003,leak Found at Socket Weld in Primary Makeup Pump P36C Suction Relief Line.Caused by Subjection of 6-inch Suction Line to Vibration,While 3/4 Inch Relief Line Is Rigidly Supported.Pump Inspected

ML19320A072
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/01/1976
From:	Cook R ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A067	List: ML19320A066 ML19320A072 ML19320A078
References
NUDOCS 8004140685
Download: ML19320A072 (4)

Text

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@E) I AIR , A IRIK I U 101o1-1o1010101o1-10101 14 I I I il I I I i lol31 32 7 89 14 15 25 26 30 3e CATEGORY Type s DOCKET NUM8EA EVENT DATE AEPORT CAff 0 CON'Tl l I W M 1015101-101311131 1110101317161 lll11o1117161 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTON

!!E lbi . steadv state .oceah . at IM5 . 10 3 % a leak was discovered at a 80 l

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0 15ecke{inald,e;,,(3 C)O' elbow u,e11. *,n we 'Pv; ..,' Mali. . P m p ?%c. eu.4;.. re) e c 1 7 89 ' ' ' '

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@B L 80 7 89 m, Yes CCOE CCMpONENT CODE VAPM V10uTCN u Icl41 LB] lP lI l P lG lx ix i LAJ IZl919191 11]

7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION U lDe b'ilure veaw be cowtWhAfed to Oc & art Ekd khe Y4" FelieE line is NeidIv supo.rked ~

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80 HE lt.> Lite the 6" sutw. i ce is not ava is muede4 h vibrati.w . A. .w ;tecerroevousw.ars

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'st  % POWEA QTHER STATUS OSCOVERY OISCOVERY DESCASTCN

• EB LEJ 1o1919I I N A I Lbj i MA l 7 8 9 10 12 13 44 45 48 80 AYtrIsED o $ASE AMOUNT or ACTmTv toCarCN or REttast 3E LIJ lIJ l NA I I NA I

• 7 8 9 10 11 44 45 80 PERSONNEL EXPOSUAES ,

NuMsEn tvet otsConvCN g DE 1010101 LIJ lNA I 7 89 11 12 13 80 PERSONNEL INJUAIES NUM8ER DE lololol ICESCA*T'O1 N 1 7 89 11 12 80 0FFSITE CONSEQUENCES i l MA 80 i

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LOSS OR DAMAGE TO FAC:UTY fvpf OESCAWTCN Emi NA I-7 89 10 80 PUBUCITY I NA I 7 89 80 A00lTONAL FACTCAS I NA I 89 80 mg I a 0 0 4140 b bE i NAME; CCck N ONE(5 00 M l. 4 199 kEacpp,y "o "b u7 n,...w. i . t o-r s. . _ _ ._. NSP-III-2. Rev. 5

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1. Reportable Occurrence Report No. 50-313/76-29 4

2. Report Date: November 1, 1976 3. Occurrence Date: October 3, 1976

4. Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification 6f Occurrence:

Leak in Primary Makeup Pump P36C suction relief line ,

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6. Conditions Prior to Occurrence:

3 Steady-State Power X Reactor Power 2542 MWth Hot Standby Net Output 824 MWe Cold Shutdown Percent of Full Power 99  %

Refueling Shutdown Load Changes During Routine Power Operation _.

Routine Startup..

Operation

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Routine Shutdown Operation Other (specify) s

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7. Description of Occurrence: ~2 At 165S hrs. on 10.3/76, a leak was discovered at a socket weld, pipe to 900 elbow weld, in the primary makeup pump P36C suction relief line. P36C was removed from service and P36B was placed in service. .

NSP-III-2, Rev. 5 Attachment "D" S _

October 1, 1976 Page 2 of 4 l

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Reportable Occurrence Report No. 50-313/76-29 4

8. Designation of Apparent Cause of Occurrence:

Design x Procedure

, Manufacture Unusual Service Condition Including Environmental Installation / -

Construction Component Failure.

(See Failure D tta) 5 Operator Other' (specify)

This failure could be contributed to the fact that the 3/4" relief line is rigidly supported witile the 6" suction line is subjected to vibration.

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9. Analysis of Occurrence:

Even though only one pump was operable during the time repairs were made, which is allowable by Tech. Spec., there was no ha:ard to the health and safety of the public.

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1 October 1, 1976 NSP-III-2, Rev. 5 Attachment "D" 5 Page 3 Of 4 ym . . - . - +- -3.- +- ayy. .,- *.--w-. ,---a- ,------ -- e- e,

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Reportable Occurrence Report No. 50-313/76-29 4

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10. Corrective Action:

The defective weld was repaired. An engineering evaluation is being

,. made and if.necessary modifications will be made to prevent a  !

reoccurrence. - '

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11. Failure' Data: ,

This same weld failure was also reported in ROR #'/6-12.

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October 1, 1976 NSP-III-2, Rev. 5 Attachment "D" 5 Page 4 of 4 4

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