ML20094N378
| ML20094N378 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 08/01/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| ANPP-30096-TDS, DER-84-10, NUDOCS 8408160192 | |
| Download: ML20094N378 (3) | |
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..j FECEIVED NHC Arizona Public Service Company 138% IUS -8 pp I: 3g August 1, 1984 RES!O,'lVl.g ANPP-30096-TDS/TRB U. S. Nuclear. Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek,' CA 94596-5368 Attention: Mr. T. W. Bishop, Director Division of Resident Reactor Projects and Engineering Programs
Subject:
Final Report - DER 84-10 A 50.55(e) Reportable Condition Relating To Abnormal-Number Of Single Element RTD's Open Circuited File: 84-019-026; D.4.33.2
Reference:
A) Telephone Convetsation between R. Dodds and T. Bradish on February 29, 1984 B) ANPP-29141, dated March 23, 1984 (Interia Report)
C) ANPP-29608, dated May 29, 1984 (Time Extension)
Dear Sir:
Attached is our final written report of the deficiency referenced above, which has been determined tc be Not Reportable under the requirements of 10CFR50.55(e).
Very truly yours, h
n WL E. E. Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB:nj Attachment cc:
See Page Two 0
Mr. T. W. Bishop DER 84-10 Page Two-cc:
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 J. A. Brand A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher H..D.
Foster D. R. Hawkinson L. E. Vorderbrueggen R. P. Zimmerman S. R. Frost J. Self M. Woods T. J. Bloom D. N. Stover Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, GA 30339
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FINAL REPORT - DER 84 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNITS 1, 2, 3 Description of Deficiency I.
RdF Corp. has identified a potential problem with its Single Element Resistance Temperature Detectors (RTDs) (P/N 21233) that have been honed to a minimum diameter of 0.247".
The Dual Element RTDs manufactured by RdF (P/N 21252) are not affected. The RTDs are supplied to PVNGS by Combustion Engineering.(C-E).
During final testing of several pieces at RdF in late August, 1983, an abnormal number of unit-open-circuited _thereby failing inspection. Af ter an extensive analysis, RdF determined that the failures were the result of torsional twisting of the element and sheath during the honing operation leading to broken internal wires. RdF has revised their manufacturing procedures such.that a majority of the honing takes place prior to assembly with only a small length of the element being honed after assembly. This will eliminate.the problem in future pieces. PVNGS Units 1, 2 and 3 have RTDs with this potential problem and are identified by the following Unit Serial Numbers:
Unit 1 Unit 2 Unit 3 S/N 158 S/N 174 S/N 246 thru 255 S/N 159 S/N 178 thru 182 S/N 224 S/N 185 thru 192 S/N 225 S/N 227' S/N 226 S/N 232 thru 235 S/N 228 S/N 232 thru 245 S/N 229 S/N 231 S/N 236 S/N 238 thru 241 II.
Analysis of Safety Implications All of the above RTDs were returned to RdF where they were inspected
- by X-ray and disassembly, and no defects were found. Consequently, this condition is evaluated as not reportable under 10 CFR Part 50.55(e) and Part 21.
III. Corrective Action No corrective action is required since 100% inspection revealed no problem with the RTDs. In an unrelated issue, the PVNGS single element RTDs were upgraded by RdF for improved time response' capabilitie s.
The new elements were produced under RdF's revised manufacturing procedures.
Design Change Packages 1SM-RC-101, 2SM-RC-101 and 3CM-RC-101 included the upgraded RTDs as part of the overall change to the RTD thernovells.