ML20097D080

Final Deficiency Rept DER 82-80 Re Low Insulation Resistance Values for Terminal Blocks Supplied by Conax Corp.Condition Not Reportable Per 10CFR50.55(e) or Part 21

ML20097D080
Person / Time
Site:	Palo Verde
Issue date:	08/31/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-30414-TDS, DER-82-80, IEIN-84-47, NUDOCS 8409170369
Download: ML20097D080 (5)

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' ' go 30- 639597 60-63 O Arizona Public Service Company August 31, 1984 ANPP-30414-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 82-80 A 50.55(e) Reportable Condition 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 B) 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)

H) ANPP-29667, dated June 5, 1984 (Interim Report)

I) ANPP-30064, dated July 30,1984 (Time Extension)

J) ANPP-30269, dated August 17, 1984 (Time Extension)

Dear Sir:

Attached is our final written report which has been determined to be Not Reportable under the requirements of 10CFR50.55(e).

Very truly yours, EEhW/m E. E. Van Brunt, Jr.

APS Vice President 1ou Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment cc: See Page Two 8409170369 840831 g PDR ADOCK 05000528 -

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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 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 i

L. E. Vorderbrueggen R. P. Zimmerman S. R. Frost L. Clyde 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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-l FINAL REPORT - DER 82-80 DEFICIENCY EVALUATION 50.55(e)

ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNITS 1, 2, 3

.I. Description of Deficiency Specification EM-035A stipulates that Electrical Penetration Assemblies 1(EPA) be-qualified'to IEEE Standard 317-1976. .Section 5.2.1 of this standard stipulates that the instrument circuits in EPA be designed to meet the requirements of the instrumentation system in which they are used. ,

A review of the qualification test report for EPA-instrument channel terminal blocks by Conax Corp. has revealed surface .

conductivity measurements after DBE simulation which directly affect Post Accident Monitoring Instrumentation (PAMI) system performance. The increased surface conductivity resulted from the steam and chemical spray on the exposed terminals during-simulation of a MSLB/LOCA event. Subsequent investigation showed that the error contribution of these blocks to the system's performance resulted in errors in excess of those specified for some instrument channels. It is important to note that this does not mean that the terminal blocks were deficient in any manner, but only that their use in certain instrument channels was a misapplication.

II. Analysis of Safety Implications Information concerning this terminal block problem is contained in NRC IE Information Notice No. 84-47, issued June 15, 1984.

The condition described above does not represent a nonconformance in terms of reportability under the  !

requirements of 10CFR50.55(e) and/or Part 21 because the terminal blocks were (like many other components used throughout the PVNGS) accepted on the condition thatt ,

1) by completion of their existing IEEE 323 Environmental Qualification Program, they were later proven to be

environmentally qualified; and i 2) they fall within the system accuracy requirements,

[ i.e., are acceptable for their application.

Condition 1 (Environmental Qualification) was satisfied by

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testing. For some PAMI applications, given the performance deviations for penetration terminal blocks, Condition 2 was not satisfied.

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Mr. T. W. Bishop -

Final-Report - DER 82-80 '

Page Two

'After environmental qualification testing and a system-Jaccuracy evaluation were' completed :it was determined that with the existing RTD, pressure and level transmitters,- the terminal blocks did not satisfy :their portion of the channel error requirements. .At that-point the conditional acceptability.was nullified and for-the PAMI RTD, pressure and.

level transmitters terminal blocks were replaced with-environmentally qualified splices which met the system-accuracy. requirements.

In all other cases, .since their demonstrated performance is well within= system requirements as determined by the project, the terminal blocks have been left as installed. This terminal block issue was subsequently addressed in NRC IE -

Notice 84-47.

Based upon the above, this condition is evaluated as not reportable under the requirements of 10CFR50.55(e) and Part 21.

III. Corrective Action A. Conax initiated tests which verified that the effectn of degraded insulation resistance of terminal blocks could be eliminated by replacing affected EPA terminal blocks with splices utilizing Amps Special Industries' crimp connectors and Raychem's heat shrinkable insulating kits (Ref. 2).

The Conax report has been reviewed by C-E and found acceptable (Ref. 3).

B. One hundred and sixty-eight -(56 per unit) RTD, pressure and l 1evel transmitter circuits in Units 1, 2, and 3 were '

identified by C-E as affected by LOCA EPA terminal block' insulation resistance (Ref.'4). Design Change Packages 1SE-SB-033, 2SE-SB-033, and 3CE-SB-033 were inititated for replacing these EPA (Kulka) terminal blocks with'. splices that use Ampe Special Industries' crisp connectors and Raychen's heat shrinkable insulators.

The above actions are consistent with the recommendations of NRC IE Information Notice No. 84-47.

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Mr. T. W. Bishop Final Report - DER 82-80 Page Three IV. References

1) Conax Report No. IPS-1011.4 (Bechtel DDC Log No. E035A-599-1) - Design Qualification Functional Test Report for Kulka Terminal Blocks for Class 1E Service for Palo Verde Nuclear Generating Station Units 1, 2, and 3.

2) Conax Report No. ' IPS-1011.6 '(Bechtel DDC Log No. E035A-609 Design Qualification Functional Test Report for Splice Termination Assemblies for Class IE Service for Palo Verde Nuclear Generating Station, Units 1, 2, and 3.

3) Combustion Engineering letter V-CE-30392, June 18, 1984, MIC No. 226591.

4) Combustion Engineering letter V-CE-19890, March 13, 1984, MIC No. 222581.

5) Combustion Engineering letter V-CE-18426, May 18, 1983, MIC No. 208301.

6) Bechtel letter B/CE-E-48326, MOC No. 318883, June 5,1984.

7) NRC Information Notice No. 84-47.

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