ML19344A070
| ML19344A070 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 06/01/1979 |
| From: | Gibbs M ISHAM, LINCOLN & BEALE |
| To: | Cowan F, Kornblith L, Smith I Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 8007290940 | |
| Download: ML19344A070 (1) | |
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Mr. Lester tamblith, Jr...
-Atonio safety and 74 - =4== Board Atomic safety and Licensing Board 1
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U.S. Nuclear angulatory t'ammm4==4an -
U.S. Nuclear Regulatory Commission
.L Washington, D.C.
20555 Washington,~D.C. '20555
'Dr. Frederick F. Comma 5152 E. Verde.'2 rail apt. 3-125 Boom Raton,; Florida 33433
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Docket Wes. 50-329, 50-330 L
F Gentlemen:.
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Enclosed is a final $50.55(e) resort which has recently been -
e submitted by consumers Power Company to the Muslaar Regulatory Commis-sion.
i very truly yours0 -
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'j Mestrieel Penetration assembly; Essed-79; dated
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nearch 12,1979 The referessed lettere are asteria 50 55(e) reports. This letter is the t
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? field inspection by Censumers power Company of three installed EPA's.
L revealed th.m following discrepancies assocated with #10 AUG, and smaller -
.l vire terministians located in.the penetration assemblies inboard; terminal bones o t
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- 1) auproper Ing crimpe.
2). noe of Ameerrect Ing types 1
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3) lease commention en teradasi blocks
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ol Elastrical ce mentions were v4m==11y checked at randen by Eachtel j
Supplier 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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i 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 -*- -- e i
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-
<.'7['eeder.with proper enlibratism d===a=*=*4==
for the crimpdag tools anguelity verifimation desamment packages were rechecke
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f the supplier's QA maansi'and'their asseptance test procedures reipaire a
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insyneeta= and verifientima ef eesh ammafacturias operatism. The
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LT igf@.umsatisfameery s===4a=*4a== lwere identifiedjiaSome EFA.! JThe ' supplier a
? $ '% has: determined that'this 1selstedtcaseLuns the resuit'of anfemployee iTerror6This EPLwas-ama'oflthe:first units to beibuiltiand crimping was 7
, s V;.5 done;with!tus"differomettypes of crimpingi tools, cboth? correc.t forL the ~
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~/' i'M is ze and typeAf:less used., fOnafofJ the; crimpingitsols used; had-tha'
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/AWG. and. #16 mG lugs:while[the! bottom die' accepts ifl0 FANG andj f11-AMG1 4
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Ings.6Bevlaw of E ime; sheets revealed that the employee doing(tha:termi-J t
p+x ansions.f 41though properly 4traigd.ivss new and had no previous experiences,
- in this type of work.9 During thafvisual: portion of t. hah 100% ?-tion l
, ' atlthe jobsites the-suppliers representative:noted that all'the unsatis-i
- 2. factory terminations !in( tho ' EPA 'showedl no# signs; of; 44Eg a crimping.-
Alltindentations were good which" indicates 1that the crimping tool had 1
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' Based.on this thd suppliar hmtcaneladad thatfthe-inexperienced employee '
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resulted"in a full cycle crimp that would pass a visual C p**= but would not form alsolid crimp.:
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'It was also suggested that theldME7_P may be due,' in part,
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tongue terminals. with insulated. ferrules.were specified: and proiided.
q The. insulation sheath. covers-the. crisp and consequencly askes visual.
uninsulated ferrules.,
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inspection' difficult. ' All of the' suppliers current orders utiliza e
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Cortective Astine
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P* corrective antism was ' carried out'from-April 30, 1979 through h
.y ;IIsy 3,- 1979, by a Eusker-Rams representative who performed a 1001 Winspostian"ami74 of the 91 EPA's at the leidland jobsite. - The inspectiam
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Group 1)' All EP&'s.used :for Class 1E ****=47=. regardless of termination E
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- Group'2) #14 Aus, #147ANG. Land #10 AUG terminations.
I All EPA's "used for Non-class '1E' circuits with #20 MG, c
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n Bechtel Ascociates ProfessionalCJrporation d
2 MCAR 26 Page 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.
The 18 non-inspected EPA's contain like terminations as those of Group These EPA's are used for Non-class 1E circuits and were to be included 3.
in'the inJpection plan if the results of the inspection on Group 3 i
indicated the need.
"'he inspection consisted of a visual exami2ation and a " pull test"
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conducted in the following manner:
The " pull test" consisted of grasping the conductors at a The point 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 q
crimped.
All testing and rework was vitnessed by Bechtel Quality Control personnel-in addition to partial surveillance by Bechtel Electrical Field Engineering and 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.
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 all the 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,
-l it was determined :that no additional inspection would be required.for the 18 EPA's that contained like terminations.
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Bechtel Associates-Professional Corporatiori "
MCAR 26 Page 4.
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'.. '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% inspection s
program consisting of, _ visual inspection, pull testing, and continuity testing for all terminations on all current and future nuclear projects 1
and has established a special training program for all nuclear production personnel. This program has been initiated as of April 24,1979 and therefore 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 j
condition was determined to be reportable.
Submitted by:
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Approved by /
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