ML20050B236
| ML20050B236 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 03/18/1982 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ANPP-20465-GHD, DER-81-12, NUDOCS 8204050126 | |
| Download: ML20050B236 (5) | |
Text
Docket No. 50-528/529/530 i'
u rF 50 55(e) Report MMIAM 1.PllET.Iblld Ef!IM.WdD $j (C D TlILP M J?/
P. O. B OX 216 6 6 PHOENIX, ARIZON A 85036 March 18, 1982 ANPP-20465-mm/BSK G
U. S. Nuclear Regulatory Commission
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Region V Creekside Oaks Office Park
'lDO 1450 Maria Lane - Suite 210 9
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02A Walnut Creek, California 94596-5368 Attention:
Mr. B. H. Faulkenberry, Chief k
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Reactor Construction and Engineering Support Branch d j gg
Subject:
Interim Report, Revision 3 - DER 81-12 A 50.55(e) Potentially Reportable Deficiency Relating to Mating Force of 125V DC Pull-Out Fuse Blocks Decreases After Several Insertions and Removals File:
82-019-026 D.4.33.2
Reference:
(A) Telephone Conversation between J. Eckhardt and B. S. Kaplan on May 21, 1981 (B) ANPP-18237, dated June 18, 1981 (Interim Report)
(C) ANPP-19545, dated November 25, 1981 (Interim
(
Report, Revision 1)
(D) ANPP-19869, dated January 11, 1982 (Interim l
Report, Revision 2)
Dear Sir:
l The NRC was notified of a potentially reportable deficiency in Reference l
(A), and Interim Reports were transmitted by References (B), (C) and (D).
At that time, it was estimated that a Final Report would be available by March 18, 1982.
Due to the extensive investigation and evaluation required, Revision 3 of the Interim Report is attached.
It is now expected that this information will be finalized by June 30, 1982, at which time a complete report will l
be submitted.
<f, ': w' Very trul yours, k
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E. E. Van Brunt, Jr.
PDR ADOCK 05000528 MAR' 2519'82 d
APS Vice President J
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ANPP Project Director EEVBJr/GHD:ske p
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Attachment L'
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U. S. Nuclear Regulatory Commission Attention:
Mr. B. H. Faulkenberry, Chief ANPP-20465-GHD/BSK March 13, 1982 Page 2 cc:
Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 J. A. Roedel D. B. Fasnacht C. C. Andognini F. W. Hartley J. M. Allen A. C. Rogers B. S. Kaplan W. E. Ide J. Vorces J. A. Brand A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen R. L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 i
Ms. Patricia Lee Hourihan 6413 South 26th Street Phoenix, Arizona 85040 l
l
b INTERIM REPORT, REVISION 3 - DER 81-12 POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNITS 1, 2 AND 3 I.
Potential Problem The pull-out fuse blocks identified as Bulldog Electrical Products (actually manufactured by Gould, Incorporated, Bellefontaine, Ohio) and supplied as a component of the 480V Load Centers from Brown Boveri Electric, Incorporated, were found to have a substantial.
reduction in the mating Corce requirement after several insertions and removals.
This condition was raised as a concern by the project Start-Up group because there exists a question'as to whether the copper female clips provided with the fuse block are capable of performing their safety-related function of maintaining contact after many removals and insertions of the fuse blocks during the life of the plant.
The condition is apparently caused by the inadvertent annealing of the fuse clip while brazing it to its mounting terminal during the manufacture of the fuse block assemblies.
Equipment Tag Numbers 1,2,&3-E-PGA-L31 1,2,63-E-PGB-L32 1,2,&3-E-PGA-L33 1,2,&3-E-PGB-L34 1,2,&3-E-PGA-L35-1,2,&3-E-PGB-L36 II.
Approach To and Status of Proposed Resolution Gould, Incorporated, Bellefontaine, Ohio is proposing to furnish a mechanical retainer which, when installed in the fuse block body, will provide a positive retaining force for the fuse clips. The vendor is in the process of developing a sample for test purposes, and plans on back-fitting all delivered equipment. See letter from Brown Boveri _ Electric, Incorporated to Bechtel Power Corporation dated March 4,1982 (copy attached).
III.
Projected Completion of Corrective ~ Action and Submittal if the Final Report The final report is currently forecast to be completed by June 30, 1982 to allow sufficient time for Brown Boveri Electric, Incorporated to complete an acceptable corrective action plan.
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BBC Brown Boveri eiectric, inc.
ittachment to dea 81-12 euows sovt m Manufacturer of I-T E Electncal Power Equipment March 4, 1982 Bechtel Power Corporation P.O. Box 60860 Terminal Annex Los Angeles, CA 90060 Attention:
Mr. W. G. Bingham Project Engineering Manager Los Angeles Power Division
Subject:
Arizona Nuclear Power Project Bechtel Job Number 10407 Purchase Order 10407-13-EM-017 Brown Boveri Electric, S.O. 33-52187
Dear Mr. Bingham:
This letter is in response to your Deficiency Evaluation Report Number 81-12 wherein you reported that the mating forces of the 125VDC control power fuse blocks decreases substantially after several insertions and removals. Your letter further indicated that the pullout fuse blocks are manufactured by Bulldog Electric Products Company and were supplied as a component with the 480V load centers.
Apparently the copper material of the female clips appeared to lose spring action once forced apart by fuse block insertion.
Although the mold lettering on the fuse block indicates that it is manufac-tured by Bulldog Electric Products Company, the fuse block is actually made by Gould, Inc. in Bellefontaine, Ohio.
It is identified as Part Nu=ber UB20116.
In some cases when the U-shaped or female clip is brazed to its mounting terminal it has possibly been annealed, causing it to lose its spring pressure.
This condition does not exist on all of the fuse block assemblies; it exists on a small percentage of them, yet to be determined.
For corrective action, the vendor has agreed to furnish a mechanical retaining clip which will be attached to the fuse block cover by an existing screw.
This
.chanical retaining clip on a fuse block cover will mate with the fuse block body making a positive retaining force. The connection will be purely mechanical.
It will have no contact with current carrying parts.
It will be fully visible and.should not require that the equipment be deenergized to install it.
The vendor is in the process of producing mechanical retainers for test pur-poses and to provide us with a sample.
Concurrent with this action, the vendor is also producing mechanical retainers to be supplied for field Skitchgeer Systems Dmeion Spring House, PA 19477
- 1215) 628-7400 i
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y B.o.B,.wC Brown Boveri Electric, InC.
Attachment to DER 81-12 March 4, 1982 Page 2 corrective action.
The vendor estimates four to six weeks for the delivery of the mechanical retainers for field corrective action. As soon as the vendor's sample mechanical retainers and test data are available for our Engineering evaluation, we will advise you of our findings.
It appears, at this time, that this corrective action can be installed at your convenience without any impact on installation or checkout operations.
To the best of our knowledge, this fuse block has not been used in any other Nuclear applications other than the Palo Verde Project.
Corrective action will be required at Palo Verde Units 1, 2 and 3.
When Bechtel/ Arizona Public Service files their final 10CFR50.55(e) Report, it should close out this matter. The 10CFR Part 21 Report will not be required sin e this matter was limited to Palo Verde and, the completion of corrective action at this loca-tion will close out this matter in its entirety.
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$!s. s c)h E. W. RHOADS l
Manager Quality Assurance EWR/jm cc:
J. A. Cosgrove j
i J. W. Ferral l
M. D. Hatfield J. A. Huntsman l
A. E. Johnson l
W. E. Laubach J. J. McAlinn
.