ML20197G924
| ML20197G924 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 06/05/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-29667-TDS, DER-82-80, NUDOCS 8406180209 | |
| Download: ML20197G924 (3) | |
Text
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5 50-517, 529, 620
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Arizona Public Service Company
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i June 5, 1984
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_e p q7 ANPP-29667-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 1
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Subject:
Interim Report, Revision 2 - DER 82-80 A 50.55(e) Potentially Reportable Deficiency Relating to Low Insulation Resistance Values For Terminal Blocks Supplied By Conax Corporation.
File: 84-019-026; D.4.33.2
Reference:
A) Telephone Conversation between T. Young and G. Duckworth on December 17, 1982 i
E) ANPP-22736, dated January 17, 1983 (Interim Report)
C) ANPP-23642, dated May 3,1983 (Time Extension)
D) ANPP-27619, dated August 23, 1983 (Time Extension)
E) ANPP-28539, dated January 3,1984 (Interim Report)
F) ANPP-28933, dated February 24, 1984 (Time Extension)
G) ANPP-29351, dated April 24, 1984 (Time Extension)
Dear Sir:
The NRC was notified of a potentially reportable deficiency in Reference A, Interin Reports were transmitted by Reference B and E and Time Extensions were requested by References (C), (D), (F) and (G). At that time, it was estimated that a Final Report would be available by June 12, 1984.
Due to the extensive investigation and evaluation required, a revised Interim Report is attached. It is now expected that this information will be finalized by July 31, 1984, at which time a complete report will be submitted.
Very truly yours, Cm
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E. E. Van Brunt, Jr. khk APS Vice President Nuclear Production ANPP Project Director EEVB/TRBidb Attachment i
ect See Page Two
- # 81<
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Mr. T. W. Bishop DER 82-80 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 B. S. Kaplan D. E. Fowler T. D. Shriver C. N. Russo J. 70rees 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 G. A. Fiore111 S. R. Frost J. Self D. Canady Records Center 4
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339 9
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INTERIM REPORT REVISION 2 - DER 82-80 POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNITS 1, 2, 3 I.
Potential Problem The referenced specification requires that Electrical Penetration Assemblies (EPA) be qualified to IEEE Standard 317-1976. Section 5.2 of IEEE 317-76 requires that the instrumentation circuits in EPA be designed to meet the requirements of the instrumentation system in which they are used.
Review of qualification reports for terminal blocks supplied by Conax Corporation has revealed substantially low insulation resiacance values during the design basis event simulation tests.
Low level signals (up to a maximum 48V-de and 4-20 ma range) cannot tolerate this low insulation resistance condition. This could result in erroneous control functions that may jeopardize reliable plant operation under an accident condition.
II.
Approach to and Status of Proposed Resolution A functional test was conducted by Conar on aged and irradiated, Kulka terminal blocks. This test duplicated the actual installation with transmitters, RTDs and thermocouples, as well as cable supplied from the jobsite. The test was performed under a simulated LOCA environment (steam and chemical spray).
It was found that the Kulka terminal blocks did not function satisfactorily in the transmitter and RTD circuits. They were satisfactory for the thermocouple circuits. Test results are given in Conax Report No. IPS-1011.4 -
Palo Verde Terminal Block Functional Test Report (3rd test); Bechtel DDC Log No. E035A-599.1.
Next, the Kulka terminal blocks were removed from the transmitter and RTD circits in the test setup and replaced with Raychem splices, which were installed per Raychem's recommer.dations, using their heat-shrinkable insulating material kits. The Raychem splices functioned satisfactorily in tha LOCA environment. The final evaluation was completed on March 14, 1984 and is reported in Conax Document No. IPS-1011.6 - Design Qualification Functional Test Report for Class IE Service for Arizona Nuclear Project; Bechtel DDC Log No. E035A-609-1.
Bechtel engineering is currently corresponding with Combustion Engineering on this problem to determine reportability and technical justification for corrective action.
III. t rojected Completion of Corrective Action and Submittal of the Final Report Evaluation of this condition and submittal of the Final Report is Forecast to be completed by July 31, 1984.
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