ML19309D775

RO 50-313/76-03:on 760325,reactor Surveillance Specimen Holder Tube Failure Found.Caused by Missing Spring Cartridge from Specimen Tubes Due to Apparent Incorrect Design.Reactor Will Be Defueled,Inspected & Modified If Necessary

ML19309D775
Person / Time
Site:	Arkansas Nuclear
Issue date:	04/08/1976
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19309D771	List: ML19309D770 ML19309D775
References
NUDOCS 8004110664
Download: ML19309D775 (4)

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m LICENSEE EVENT REP"9T CONTROt StOCx:1 1 I I I l I cetrasa nniur att neousaso iwronmariani "E*u'E tcENsf NuueER 'N' YYPE 01 l A l nl Al nl xl il 7 89 14 101 o 1-101 ol ol 0101-1 o 101 15 25 141 28 i l il il il lo li l 30 31 32 CATEGORY Y COCKET NL,MtstR EVENT DATE REPOAT OATE 01 CONT I 7 8 57 I

58 1 Ltl59 L1J 60 l o i s i o l-l o i s l il si lo l 3121 s l 7161 1014101817161 61 68 69 74 75 60 EVENT DESCRIPTION DE l While making preparation for removing surveillance specimens for inspection of holder l 7 89 80

@l tubes due to wear at other B6U plants, it was found that spring cartridge was missing l 7 89 80' gg l from 2 tubes and one of those two tubes was partially missing along with push rod l 7 89 l_

80 j' gE l and journal bearing. Search for missing pieces initiated.(50-313/76-3) j i 7 89 80 hl 7 89 l pmg 80 ,

DE CODE COMPONENT CODE SUPPLER M R VIOLATON BE l cl Al Lttl 7 89 10 Ixi x1 xl xix Ix1 LN_j l BI 01 11 51 (lL) 11 12 17 43 44 47 48 CAUSE DESCRIPTION EI 7 89 NA I

80

si us  % POW ER OTHEA SinTUS DISCOVERY DISCOVERY DESCA6PTON 1

7 8 L6J 9

l ol ol ol I NA I Ld I sa I 10 12 13 44 45 48 ,

80 RELE SED OF ASE AMOUNT OF ACTMTV E L2] L2J l n I I LOCATON OF AELEASE NA l 7 8 9 10 11 44 45 e3 PERSONNEL EXPOSUAES NUMBER TYPE DESCR@ TON DE I nl nic Lz] I NA I

7 89 il 12 13 80 PERSONNEL INJURIES NUMBEA DESCRIPTON BE l 010101 1 NA l

7 89 11 12 80 OFFSITE CONSEQUENCES 3E I NA l

7 89 80 LOSS OR DAMAGE TO FACILITY 'I rvPE OESCaerON

.l 52 LLJ l Extension of shutdown approximatelv 2 months to defuel. inspect, and refuel l UBUCITY

$I 7 89 Press release made on 4/8/76 I 80

~! I ADOITIONAL FACTORS ur 4110 66u r l j

7 89 80  !

DE I 7 89 i 1 80 i NAME: Danie1 II. Mil 1iams PHONE: (501) 371-4192' ~

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Repo~rtahic occurrence poport JJo. 50-313/76-3

2. fteport Date: 4/8/76 1 Oa ursence Dine: 3/25/76  ;

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4. 1:ac111ty :

Arkansas Nuclear One-Unit i l f

Russellville, Arkansas 72801

5. Identification of Occurrence: .

Reactor surveillance specimen holder tube failure.

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6. Conditions Prior to, Occurrence: 7 i

Steady-State l' owe r ,_, _

lleactor l' owe r 0 finit h  ;

!!ot Standby Net Output 0 httVe Cold Shutdown X Percent of 1:ull Power 0 '6 Refueling Shutdown Load Changes During Routine p Power Operation Routine Startup

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Opcrat ion f Routine Shutdown Operation Other (specify)

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7. Description of Occurrenec: -

At approximately 2200 hour0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> while making preparation for removing the sur-veillance specimens for the inspection of the specimen holder tubes due to wear problems at two other 861f plants, it became apparent that the spring i:

cartridge was missing from 2 of 3 specimen tubes. In addition one of those -

tubes, identified as tube no. 3,had the push rod missing and detached from the specimen, the journal bearing missing, and part, if not all, of the -

holder tube missing from the top of the shroud to the upper hinge of the specimen tube. ~

1 Tube no. 2 is in the same condition as tube no. 3 except that part, if 1 not all, of the push rod is attached to the specimen and part, if not

{N all, of the holder tube is still around the push rod. All of tube no. 1 was intact and the specimen has been removed. A 6h foot section of holder (

j tube came out when the specimen was removed. The specimens for tubes no. 2 and 3 appear to be in their proper location. ^

Attachuent "C"

!! arch 23, 1976 NSP-l o, llev. 1 Page 2 of ~1

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!!cportable Occurrence I:cpre t No. ~ 50-313/76-3 a5

l 8 Desipg fun of ,gliarent Canse of Ocentrence:

[ Design y l'rocedu rc 1 ~

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! Ihautfacture Unusu:il .Scrvice Condition Including linvi ronmentral "

jl Installation /.

Construction Component I:ailure ___

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9. Analysis of Occurrence: --

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j} There is no evidence of failed fuel due to what appears to be loose parts in the reactor, thus no hazard to the health and safety of the public. {

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f At t acloisent "C"

bb reh 13, l'J70 NSP-10, Rcv. 4 l' age 3 0f 4 i

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Reportajile Occurrence !!cport 11o. 50-313/76-3 l 4

10. Corrective Action.:.

s The reactor will be defueled, the internals removed, loose parts retrieved, i'

l and necessary modifications and inspections made to prevent red,ccurrence. ,

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.i j' i1. Failure Data:

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!!o prior failures of this type at ANO. -

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lit t a clonent "C" March 23, ' 1976 NSP-10, Rev. 4 Page a of .1 e

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