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meesrieel reestration Assenhirs ano -1--3 amuser 15,1979 1
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2). Ishtar S I Esse 11 to J G Esppler; 3tidland 3han3aer Plant - Imat as 1, neekst so 50-3aps mit so a mocket En 50-330; 'jMestrieel Penetration assembly; Essed-79; dated, ..
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~ nearch 12,1979 ,,
The referessed lettere are asteria 50 55(e) reports. This letter is thet,
final 50 55(e) report aa==== sat =v the diaeropent terminstamos found in thee in.tomed teaudsel homme of Units me 1 and 2 elastrieel peastranica essemblies.
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A descriptism er the disesepenny, prehehla asese, sampleted* pert eerzustive,eatsam aus isolamentes presses sensestive estica are - la the ,o . ' --**- to this latter.
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E ~L* . neocription of oiscrepangy '. . ,
|| ? field inspection by Censumers power Company of three installed EPA's.,
L revealed th.m following discrepancies assocated with #10 AUG, and smaller -*'' -
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vire terministians located in.the penetration assemblies inboard; terminal-
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Elastrical ce mentions were v4m==11y checked at randen by Eachtel jSupplier quality Ray m eme4ve (SQR) as part of taprocess'inspectism. , y-Electrical.a====e*4== were subjected to a 100E electrical check according
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to the supplier's acceptance , test procedure'. . Electrical testaf,wer,e :'. , rendenly witnessed by Bechtel'SS. fall verificatima documents, insleding" -.
the electrical tests (insulation resistance and contianity) were ehmekad -.by Bechtel .SQE prior to r=1===4=g eggipment for -*- -- ei -
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1he artsping tools which were used for the Midland work were enhjected ' -; to tegular enlibratiam shacks'and pull tests to verify am11bration. .
... ~ 7ta11 tests were rendenly ud*=====d by Bechtel SQR. Tha equipment- -''
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Bechtel Ascociates ProfessionalCJrporation ..,
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MCAR 26Page 3 .
7 Group 3) All EPA's used for Non-class 1E circuits with f 6 AWG, #2 AWG, -#4/0 AUG, and 350 MCM terminations.
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The 18 non-inspected EPA's contain like terminations as those of GroupThese EPA's are used for Non-class 1E circuits and were to be included3.-
in'the inJpection plan if the results of the inspection on Group 3i
indicated the need.
"'he inspection consisted of a visual exami2ation and a " pull test" .~'conducted in the following manner:
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The " pull test" consisted of grasping the conductors at aThepoint adjacent to, but not tou,ching, the lug barrels.,
conductors were manually, and individually, pulled by the_ , , -representative to ensure that the terminations were securely qcrimped.
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All testing and rework was vitnessed by Bechtel Quality Control personnel- |in addition to partial surveillance by Bechtel Electrical Field Engineeringand Consumers Power Company Quality Assurance personnel.
The results of the inspection are:".
A) -74 EPA's were inspected 17,714 terminations total.
B) No unsatisfactory terminations were found in 54 EPA's - 12,631' terminations total. _
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C) Unsatisfactory terminations were found in 20 EPA's - 93 unsatis- '.
factory terminations out of 5,083 terminations total."
Based on the total terminations of "C", the percent of unsatisfactory ,terminations is 1.83%. However, based on the total terminations'of allthe inspected EPA's .("A"), the percent of unsatisfactory termidations is
; 0.5252.
No improper terminations were found in the EPA's of Group 3, therefore, ,-|it was determined :that no additional inspection would be required.for
, , the 18 EPA's that contained like terminations.
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MCAR 26'
Page 4.~
' . . 'f During the April'30,1979 -through May 3,1979 inspection all unsatisfactory~ ~" terminations were reworked and passed further inspections and pull-
tests. In. addition, all terminations were' checked for:
1) Proper type of lug. '.,,2) . Proper. lug indentation.3) Tightness to terminal blocks. i
As process corrective action the supplier has initiated a 100% inspections .program consisting of, _ visual inspection, pull testing, and continuity |
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testing for all terminations on all current and future nuclear projects 1
and has established a special training program for all nuclear productionpersonnel. This program has been initiated as of April 24,1979 andtherefore should prevent iteoccurrence for~any potential add-on order: ;.for Midland. H,
Safety i.mplication, , ,
If this condition had gone undetected, the ability of the EPA to perform !,'
its intended safety function may have been compromised. Therefore, this jcondition was determined to be reportable. -
Submitted by: M /./ f' lz, ,MeQ_Approved by /w ,
Concurrence by: ..4.-
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