ML20066D850
| ML20066D850 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/02/1982 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ANPP-22177-GHD, DER-81-12, NUDOCS 8211120313 | |
| Download: ML20066D850 (6) | |
Text
Locket Nos. 50-528/529/530 0
,5 50.55(e) Report ps WO D/ gp Arizona Public Service Company N
P.o. BOX 21666 + PHOENIX, Anl2ONA 85036 T
N//: //
November 2, 19 ANPP-22177-GHD/B T/y U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. D. M. Sternberg, Chief Reactor Projects Branch 1
Subject:
Final Report - DER 81-12 A 50.55(e) Report 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 Report, Revision 2)
(E) ANPP-20465, dated March 18, 1982 (Interim Report, Revision 3)
(F) ANPP-21234, dated June 21, 1982 (Time Extension)
(G) ANPP-21589, dated August 10, 1982 (Interim Report, Revision 4)
Daar Sir:
Attached is our final written report of the deficiency referenced above, which has been determined to be Not Reportable under the requirements of 10CFR50.55(e).
Very truly yours,
\\3 CLLL Alll
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E. E. Van Brunt, Jr.
APS Vice President Nuclear Projects Management ANPP Project Director EEVBJr/GHD:db h
Attachment cc: See Attached Page 2 8211120313 821102'
- PDR ADOCK 05000528 S
U. S. Nuclear Regulatory Commission November 2, 1982 -
Attention:
Mr. D. M. Sternberg, Chief ANPP-22177-GHD/BSK Page 2 cc: Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 T. G. Woods, Jr.
J. A. Roedel D. B.
Fasnacht G. C. Andognini A. C. Rogers B. S. Kaplan W. E.
Ide J. Vorees 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 G. A. Fiorelli Lynne Bernabei, Esq.
Harmon & Weiss 1725 "1" Street, NW Suite 506 Washington, D. C. 20006 I
R. L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 i
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' FINAL REPORT - DER 81-12 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC' SERVICE COMPANY (APS)
PVNGS UNITS 1, 2 & 3 I.
DESCRIPTION OF DEFICIENCY The pull-out fuse blocks supplied as-a component of the d.c. control circuitry of the safety-related 480 Volt Load Centers by Brown Boveri Electric Incorporated (BBE), were found to have a substantial reduction in the mating force requirement after several insertions and removals.
j This condition was considered unacceptable because of the question as to whether the electrical contacte mated properly to assure their safety
+
related function of maintaining reliable and interraptable electrical paths in d.c. tripping circuits of 480 Volt Load renter air circuit breakers.
The cause of the deficiency is attributed to the inadvertent annealing of the fuse clip while brazing it to its mounting terminal during the manu-facture of the fuse block assemblies by the subtier supplier Gould, Inc.,
j Bellefontaine, Ohio.
The Class IE equipment affected by this condition are identified by the following equipment tag numbers:
1,2,&3-E-PGA-L31 1,2,&3-E-PGB-L32 1,2,&3-E-PGA-L33 1,2,&3-E-PGB-L34 l
1,2,63-E-PGA-L35 1,2,&3-E-PGB-L36 f
BBE has reviewed this condition and has provided instructions for correc-tive action on all fuse blocks furnished in the above equipment. A mechanical retaining clip is to be attached to the fuse block cover. This clip will mate with the fuse block body creating a positive retaining force. The connection is purely mechanical and the electrical ratings of the device will not be impaired.
II.
ANALYSIS OF SAFETY IMPLICATIONS This condition is evaluated as not reportable under the requirements of 10CFR50.55(e) since, if left uncorrected, the condition would not have prescuted a safety significant condition. All IE 480V load center breaker i
d.c. tripping circuits utilizing the subject fuse blocks contain d.c. voltage supervision relays which provide main control room annunciation on loss of control voltage. Operations personnel are thus advised of any loss of l
continuity in the d.c. control circuitry for the IE 480V load centers, and in the absence of this alarm annunciation feature, are assured that the fuse i
blocks are in position and voltage is available to operate the breakers and sapply power to safety related equipment as required.
Final Report - DER 81-12 Page 2 III.
CORRECTIVE ACTION For Unit 1,. Test Exception Report P-G-002 will be dispositioned to perform field modifications in accordance with BBE's recommended corrective action as per the attached letter.
s NCR's will be initiated to implement the BBE provided modification in Units 2 and 3.
Verification that the modification has been completed will be included in.
the Startup procedures.
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~ BOD Brown Boveri Electric Inc
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Attachment to oEn 81-t2 n.
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Manufacturer of IT E Electncal Power Equipment j.yg 4 me mu
. ntr A -- b 1 L August 17, 1982 M' 7 23'E hX. e-h$)
Bechtel Power Corporation P. O. Box 60860
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Terminal Annex nuo Los Angeles, CA 90060
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v Attentlon:
Mr. W. G. Bingham b rni Project Engineering Manager Los Angeles Power Division Q,, ' **
os
Subject:
Arizena Nuclear Power Project Bechtel Job Number 10407
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~I N>yf Purchase Order 10407-13-Bi-017 u
R Brown Boveri Electric S.O. 33-52187 T
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Dear Mr. Bingham:
This letter is to serve as our final report 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.
The report further indicated that the pullout fuse blocks were manufactured by Bulldog Electric Products Company and were supplied as a component with the 480 volt load centers.
Although the mold lettering on the fuse block indicates that it is manufactured by Bulldog Electric Products Company, the fuse block is actually made by Gould Inc., Bellefontaine, Ohio.
It is identified as part number UBZO116.
In some cases, when the U-shaped 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.
For corrective action, the vendor has furnished a mechanical retaining clip which will be attached to the fuse block cover with an existing screw.
This mechanical retaining clip on the fuse block cover will mate with the fuse block body making a positive retaining force.
This connection is purely mechanical.
It will have no contact with the current carring parts.
It is fully visible and accessible and does not require that the equipment be deenergized to install it.
Also, the
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vendor has advised us that the electrical rating of the device will not be impaired due to the annealing of the female copper clips in the body of the fuse block.
~
Swhchgeer Systems Diveion Spring House. PA 16477 * (2151 s2S7400
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0 ' B B,o.,,,~CBrown Boveri Electric, Inc.
Attachment to ora 81-12 2
The mechanical retainers to be installed in the fuse block cover have already been delivered to our Phoenix District Office.
Some o-f these have been delivered to the jobsite for installation.
The mechanical retainers can be installed at your convenience.
In order to eliminate the need for any inspection or test as to the condition of the fuse block, the mechanical retainers should be installed on every fuse block cover.
This minor modification should have no impact on installation or checkout operations.
I To the best of our knowledge, this fuse block has not been used in any other nuclear application, other than the Palo Verde Nuclear project.
Corrective action will be required at the Palo Verde units 1, 2 and 3.
When Bechtel/ Arizona Public Service files their final 10CFR5055(e) report, it should close out this mstter.
A 10CFR part 21 report will not be required since this matter was limited to the Palo Verde project and, completion of the corrective action at this location will close out this matter in its entirety.
e
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dos E. W. Rhoads Manager, Quality Assurance EWR:ne cc:
J. A. Cosgrove J. W. Ferral M. D. Hatfield J. A. Huntsman A. E.
Johnson W. E. Laubach J.
J. McAlinn
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