ML20080G591

Final Deficiency Rept DER 83-86 Re Failure of C-E Seismic Analysis of Shutdown HX to Adequately Address Baseplate Thickness.Initially Reported on 831223.One-inch Plates Will Be Added to Base Plates.Also Reportable Under Part 21

ML20080G591
Person / Time
Site:	Palo Verde
Issue date:	01/26/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-PT21-84 ANPP-28722-BSK, APP-28722-BSK, DER-83-86, NUDOCS 8402130458
Download: ML20080G591 (3)

Text

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MCOVEb C

Arizona Public Service Company P.O. BOX 21666 e PHOENIX, ARIZLNA 85036 ISik FE3 6 Pl! 12 y January 26, 1984 ANPP-2872 2-BSK/TRB p.,,,

. -w U. S. Nuclear Regulatory Commission Region V Creekside Oaks Of fice Park 1450 Maria Lane - Suite 210 We lnut Creek, CA 94596-5368 Attention: Mr. T. W. Bishop, Director Division of Basident Reactor Projects and Engineering Programs

Subject:

Final Report - DER 83-86 A 50.55(e) Reportable Condition Relating to Seismic Analysis Of The Shutdown Heat Exchanger Did Not Adequately Address Baseplate Thickness.

File:

84-019-026; D.4.33.2

Reference:

A) Telephone conversation between P. Narbut and K. C. Parrish on December 23 1983 B) Telephone Conversation between P. Johnson and T. Bradish on January 24, 1984

Dear Sir:

Attached is our final written report of the Reportable Deficiency under 10CFR50.55(e), referenced above.

Very truly yourp Cc (CLL.(

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C 4 LLC E. E. Van Brunt, Jr.

APS Vice President, Nuclear ANPP Project Director EEVB/TRB:ru Attachment cc:

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FINAL REFORT DER 83 '

DEFICIENCY. EVALUATION 50;55(e)

ARIZONA PUBLIC. SERVICE COMPANY. (APS)

PVNGS UNITS 1,~2, & 3

I. Description of Deficiency

-ft During the review of NUS Technical Report 1960, Revision 2,'Bechtel

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LLog Number N001-7.01-52 ituwas determined that the original calculations-for.the-seismic analysis of the-shutdown heat exchanger-

-base plate,'did not. adequately: address the plate' thickness.

Subsequent

calculations showed that the. base plates as currently

_' installed are overstressed in localized areas around the anchor bolt holes.

- II. Analysis ' of Safety Implications -

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NC-E 1etter.'V-CE-19449' defines the safety analysis as follows:

An overstress of the heat. exchanger base plate :could, in-the worst' case, cause a failure of the base plate and excessive movement _of the heat exchanger. Excessive movement of the

. heat exchanger could reduce the integrity of the Reactor fCoolantiSystem-(RCS). boundary, i

'4 Based ;on the.above,- this condition-is evaluated as reportable

'.under the requirements of 10CFR50.55(e), since if. this j

condition were.to remain uncorrected, it'would represent'a significant safety condition.- PVNGS Project.also evaluates

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..this'. condition as reportab1e under the requirements?of 10CFR21.21(b)R(3) with the exception of sub-part-(vi), which

s f requires the number and location of'other possible defective

. equipment.

au III.l-Corrective' Action ~

A...

C-E' letter V-CE-19264, defines,that the' corrective action ist 4'

~to, add one inch reinforceme'nt plates.to existing heat-exchanger. base plates on all.3 units.-

B...

Bechtel!will implement the modifications via ' DCP's ISM-SI-108, 2SM-SI-108'and 3CM-SI-108. prior to fuel load of'the respective

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.C-E has submitte'd revised drawings and documentation.

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~A copyfof this report willLbe'sent to'C-E for their review

.!under,the requirements of 10CFR21.-

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