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)

Text

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COCKET NL,MtstR EVENT DATE REPOAT OATE 01 CONT I I

1 Ltl L1J l o i s i o l-l o i s l il si lo l 3121 s l 7161 1014101817161 7 8 57 58 59 60 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

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gE l and journal bearing. Search for missing pieces initiated.(50-313/76-3) j i

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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

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

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$I Press release made on 4/8/76 I

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ADOITIONAL FACTORS

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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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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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Conditions Prior to, Occurrence:

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Steady-State l' owe r,_,

lleactor l' owe r 0

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!!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

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Routine Startup Opcrat ion f

Routine Shutdown Operation Other (specify)

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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.

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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

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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.

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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:

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Design y

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1 Ihautfacture Unusu:il.Scrvice Condition Including linvi ronmentral jl Installation /.

Construction Component I:ailure j

Operator Ottier (spec.ify]

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Analysis of Occurrence:

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There is no evidence of failed fuel due to what appears to be loose parts

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in the reactor, thus no hazard to the health and safety of the public.

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

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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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Failure Data:

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!!o prior failures of this type at ANO.

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