ML20106F486
| ML20106F486 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/19/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-30913-TDS, DER-84-45, NUDOCS 8410300263 | |
| Download: ML20106F486 (4) | |
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'li.W; Arizona Public Service Company
% GCT 24 (y 1: op October 19, $9$4N VfD ANPP-30913-TDS /TRB U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. T. W. Bishop, Director Division of-Reactor Saf ety and Projects
Subject:
Final Report - DER 84-45 A 50.55(e) Reportable Condition Relating To Spot Welding On Skid Mounted Indication And Control.
File: 84-019-026; D.4.33.2 Ref erence: A) Telephone Conversation between D. Hollenbach and T. Bradish on July 17, 1984 B) ANPP-30260, dated August 16, 1984 (Interim Report)
C) ANPP-30666, dated September 26, a984 (Time Extension)
Dear 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,
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E. E. Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment cc:
See Page Two 8410300263 841019 PDR ADOCK 05000328 s
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i Mr. T. W. Bishop DER 84-4 5 -
Page Two'~
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. Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 T. ~ G. Woods, Jr.
D. B. Karner W. E. Ide D. B. Fasnacht A. C. Rogers L. A. Souza D. E. Fowler T. D. Shriver C. N. Russo J. Vorees J. R. Bynum J. M. Allen A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher H. D. Foster D. R. Hawkinson R. P. Zimmerma'n L. Clyde M. Woods T. J. Bloom D. N. Stover J. D. Houchen J. E. Kirby D. Canady Records Center Institute of' Nuclear Power Operations
' 1100 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339 N,
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FINAL REPORT - DER 84-45 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS' UNITS 1 & 2
'I.
_ Description of Deficiency 1
.During static seismic testing at the supplier's facility, Kaman Instrumentation has identified a mechanical failure on the skid-mounted indication control (SMIC) units, revealing insufficient
' welds on some of the retaining studs. This condition may allow the SMIC to become a potential miss.e during a seismic event and/or
= cause operational failure of the radiation monitor it -services.
Kaman Instrumentation has identified the following affected monitors with attached SMIC units:
. Tag No's.
1JSQBRU145 1JSQNRU141 2JSQNRUl41 1JSQBRU146 1JSQNRU142 2JSQNRU142 2JSQNRU143 2JSQBRU145 1JSQNRU143 2JSQBRU146 1JSQNRU144 2JSQNRU144 Evaluation
--SMICs attached to the radiation monitors have the tag letter
' designation "RE" rather than "RU" as indicated by the supplier.
s The RU designation is the radiation monitors' microcomputer and is remotely. located. ~ The following eight radiation monitors are not saf ety-related because they are located in the turbine building, a Quality Class R, Seismic Category 2 structure.
1JSQNRE141 2JSQNRE141 1JSQNRE142 2JSQNRE142 1JSQNRE143 2JSQNRE143 IJSQNRE144' 2JSQNRE144 The remaining four radiation monitors are safety-related and are
' located in.the fuel. building, L a Quality Class Q, Seismic Category 1 structure.
1JSQBRE145 2JSQBRE145 -
1JSQBRE146 2JSQBRE146 s
The safety-related monitors (Bechtel Dwg 13-P-ZFL-501) are located
'on the 185'-6-3/4" elevation of ~ the fuel building, surrounded by saf ety-related HVAC ducts on three sides' and the building wall on the f ourth (Bechtel Dwg 13-P-ZFC-509). Failure of the retaining studs on the SMIC units during a seismic event will not, result in sufficient. damage.to the HVAC ducts _ such that operation of the
- safety-related HVAC system would be impaired. Alse, these physical constraints preclude any of the SMICs f rom becoming a potential missile and inflicting damage to other saf ety-related equipment.
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Final Report DER 84-45 Page Two The function of the SMIC is for local indication and control.
Its physical loss due to a seismic event would not affect the operation of the monitor which would continue to perform its. safety-related
' function. Primary control of --the radiation monitors is from the remote indication and control, RIC, located in cabinet JSQAC01/JSQBC01 of the control building.
II.
Analysis of Safety Implications Kaman has made notification of this. condition under the requirements of 10CFR Part 21.
However, based on the above evaluation, this condition if lef t uncorrected -is not safety significant as installed at PVNGS. This condition for PVNGS is therefore evaluated as not reportable under 10CFR50.55(e) and Part 21.
III.
Corrective Action The supplier, Kaman Instrumentation, has prepared a field test procedure for testing the stud welds on the SMIC units. The test will be perf ormed and results obtained on the affected radiation monitors per an Investigative Report 1S-IR-033 and 2C-IR-033 for Units 1 and 2 respectively.
The SMIC units for Unit 3 are still with the supplier, Kaman Instrumentation, and stud welds on the Unit 3 equipment will be verified as acceptable by the supplier prior to shipment to PVNGS.
Kaman Instrumentation has made available a retaining stud retrofit kit to replace any failed stud welds during field testing.
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