ML20040F317

Final Deficiency Rept Re Foxoboro Model 270 Displays That Failed Environ Qualification Testing,Initially Reported 811014.Condition Not Reportable Per 10CFR 50.55e Since Units Were Delivered to Jobsite Prior to Qualification

ML20040F317
Person / Time
Site:	Palo Verde
Issue date:	01/29/1982
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, ANPP-20030-GHD, NUDOCS 8202090071
Download: ML20040F317 (5)

Text

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' Docket Nos. 50-528/529/530 50.55(e) Report A

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• PHOENIX. art 2ON A 85036 January 29, 1982 ANPP-20030-GHD/BSK U. S. Nuclear Regulatory Commission (D g Region V P Q Creekside Oaks Office Park N N 1450 Maria Lane - Suite 210 p. \\

Walnut Creek, California 94596-5..i8 g .

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Attention: Mr. B. H. Faulkenberry, Chief .'t- ./E32s l ';

Reactor Construction and , 'g"; c ? '"

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Engineering Support Branch q, A ^ /

Subject:

Final Report - DER 81-37 71[

A 50.55(e) Report Relating to Foxboro Displays Which Fai e Environmental Qualification Testing

, File: 82-019-026 D.4.33.2

Reference:

(A) Telephone Conversation between J. Eckhardt and G. Duckworth on October 14, 1981 (B) ANPP-19458, dated November 13, 1981, Interim Report

Dear Sir:

A'ta:hed, 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 ours -

, CQL G Lll F. E. Van Brunt, Jr.

APS Vice President Nuclear Projects ANPP Project Director m

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8202090071 820129 IE f PDR ADOCK 05000528 f /

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U. S. Nuclear Rsguletory Commizaion Attention: Mr. B. H. Faulkenberry, Chief ANPP-20030-CHD/BSK January 29, 1982 Page 2 cc: Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 J. A. Roedel D. B. Fasnacht G. C. Andognini F. W. Hartley J. M. Allen 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 R. L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Ms. Patricia Lee Hourihan 6413 South 26th Street Phoenix, Arizona 85040

y FINAL REPORT - DER 81-37 DEFICIENCY EVALUATION 50.55(e)

ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNITS 1, 2, and 3 I. DESCRIPTION OF DEFICIENCY Foxboro Model 270 Displays are required to be environmentally and seismically qualified per specification requirements and IEEE Stds 323-1974 cad 344-1975; however, these units were delivered to the jobsite prior to qualification, as authorized by Bechtel Supplier Deviation Disposition Request 2605. Operational failures were experienced by Foxboro during the final seismic testing following the environmental test. The failures are attributed to corrosion of Burndy connectors within the display electronics. This equipment is being purchased by Bechtel and also by Combustion Engineering as part of the NSSS contract.

II. ANALYSIS OF SAFETY IMPLICATIONS This condition is evaluated as not reportable under the requirements of 10CFR 50.55(e) because (i) it is not a significant breakdown in any portion of the QA program, (ii) it is not a significant deficiency in.the final design, since the design was established by all parties not to be . finalized until successful completion of the qualification test, (iii) it is not a significant deficiency in construction, and (iv) it is not a deviation from the performance specification for'the reasons in (ii) above. The circumstances surrounding these units was never offered for acceptance. Foxboro, Bechtel, CE and APS were all aware that the Model 270 Displays had not completed all the required testing. This equipment was deliveren to the jobsite prior to being qualified to assist the construction activity and to permit the cold-hydro testing program to be completed on schedule.

III.. CORRECTIVE ACTION Refer to the attached Foxboro letter PV No. 96 dated 12-22-81.

Bechtel and Foxboro are currently developing the detailed plan to implement the required modifications. A complete listing by tag number of all Model 270 displays that have been supplied by Foxboro (including both Bechtel and  !

CE purchased displays) is being prepared by Bechtel.

A meeting is scheduled to be held at the jobsite with Foxboro during the week of February 1, 1982 to agree on which displays require modification and how.the modification will be handled.

It is estimated that approximately 360 displays per unit will require modification for an overall estimated total of 1080.

After the meeting Engineering will issue a Design Change Package with a complete listing by tag number of all Model 270 displays which require modification, so that the work can be started. It is estimated that the work will be completed within six (6) months.

i Attechment to DER 81-37 36 Neponset Avenue Fortsoro MA02035

.- Telephone 617 543-8750 The Foxboro Company we me2

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December 22, 1981 pV No. 96 Bechtel Power Corporation Palo Verde Nuclear Generating Station Terminal Annex Bechtel Order No. 10407-13-JM-lll P. O. Box 60860 Foxboro S.O. Nos. 76N-60758 77N-31240 Ios Angeles, California 90060 and 77N-31241 Attention: Mr. W. G. Bingham .

Pro]ect Engineer

Subject:

Modifications to the Model 270 Display

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Gentlemen: h, , ,,,, . _ '_

Foxboro has recently completed evaluation of the M/270 Display failures begil,j,% .'__

qualification testing. The failures were due to fretting corrosion of tie,, . __ alt.ie circuit board connectors within the display unit. Fretting corrosion rendi ts,y,',P, __

from a combination of relative motion between the connector valves (due t'DK. Z 1evel vibration) and oxidation of the connection points. Design changes em "'

N3 being implemented to correct the corrosion. These design changes entai13 ____

fications to the electronics portion of the display as we13 as to the hcuppsy",, . ..

In order to reduce the effects of vibrations, three modifications have Ig made .

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1. Stiffners have been added to the electronics cage to reduce the mot..cal:tf bio- .

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the circuit boards.

An additional set screw has been added to more firmly retain the elect 7enit.s

@d!*- _ aa.a within the housing. -o-- a.

3. Shims have been added to the housing to reduce relative motion of the electronics within the housing.

To remove the effects of oxidation lubricating caps containing a conductive lubricant have been added to female connectors on the electronics and housings.

Modified displays are in a. testing program with qualification scheduled to be complete in late 1982.

Foxboro intends to incorporate the above modifications in all of the displays presently installed at Palo Verde. Since the modifications require disassembly, Foxboro recommends that the electronics portion of the display be returned to the factory to perform the rework and also to allow a complete checkout of the electronics. The modifications to the housings are straight forward and can be implemented in the field or the faictory at Bechtel's option.

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. Attcchment to DER 81-37 Bechtel Power Corporation December 22, 1981 Page 2 PV No. 96 Foxboro will provide service personnel to remove the electronics modules and to return them to the factory. These service personnel will also perform the modi-fications to the housings in the field if so desired. Our Los Angeles field service organization will coordinate the field work. Bechtel is requested to provide a contact at the site for our service personnel. The field work can commence in January 1982.

Foxboro apologizes for any inconveniences caused by the failure of the M/270 Display during qualification testing. Extensive testing of the modified M/270's has been performed to ensure that these reworked displays will meet all require-ments. Our service, engineering and manufacturing organizations remain available to provide any assistance in reworking these displays.

Very truly yours, THE FOXBORO COMPANY J. T. Keiper, Manager Nuclear Systems Engineering cas O

POXBORO

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