ML20002D945

Nonproprietary Version of End of Cycle 4 Eddy Current Insp Results:Control Element Assemblies (Cea'S) & Guide Tube Sleeves 1980 Calvert Cliffs 1 Refueling Outage.

ML20002D945
Person / Time
Site:	Calvert Cliffs
Issue date:	12/22/1980
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:
Shared Package
ML19260G492	List: ML20002D944 ML20002D945
References
CEN-146(B)-NP, NUDOCS 8101230541
Download: ML20002D945 (11)

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i END OF CYCLE 4 EDDY CURRENT INSPECTION RESULTS:

CONTROL ELEMENT ASSEMBLIES (CEA's) AND GUIDE TUBE SLEEVES 1980 CALVERT CLIFFS I REFUELING OUTAGE 2

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DECEMBER 22, 1980 t . . _ _ _ _ _ _ . _ =-

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. LEGAL NOTICE

! THIS REPORT WAS PREPARED AS AN ACCOUNT OF WORK SPONSORED

] BY COMBUSTION ENGINEERING, INC. NEITHER COMBUSTION ENGINEERING

{ NOR ANY PERSON ACTING ON ITS BEHALF: a A. MAKES ANY WARRANTY OR R EPR ES ENT'ATION, EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF FITNESS FOfi A PARTICULAR

+ PUllPOSE OR ME RCH AN TABILIT Y, WITH flESPECT TO lilE ACCURACY,.

COMPLETENESS, Oil USEFULNESS OF THE INFORMATION CONTAINED IN Tills REPORT, OR THAT THE USE OF ANY INFORMATION, APPARATUS, METHOD, ',

OR PROCESS DISCLOSED IN THIS flEPORT MAY NOT IfJFillNGE PRIVATELY OWNED RIGHTS;OR B. ASSUMES ANY LI ABILITIES WITH RESPECT TO THE USE OF, OR FOR DAMAGES flESULTING FROM Tile USE OF, ANY INFORMATION, APPARATUS.

METHOD OR PROCESS DISCLOSED IN THIS REPORT. ,

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A. CEA EDDY CURRENT INSPECTION oo * - ~

( )CEA's, which have experienced four cycles of irradiation, were eddy current tested during the Calvert Cliffs I, E0C-4 refueling outage in

, November, 19E0. The purpose of the eddy current inspection was to quantify andlocatewearatthe(' )

The testing was performed in accordance with approved C-E procedures for the detection of CEA wear. The lower portion of each CEA . finger was in-

. spected with an encircling eddy current coil. -

Ofthe( )CEA'stested,CEA's( )wereeddycurrent tested and visually examined by TV after Cycle 3. CEA's[- )were .

selectedforexaminationafterCycle4asbeingfrompotential( )

positions based on Cycle 1/ Cycle 2 guide tube wear data. Figure 1 shows the locations of each CEA during the first 4 cycles.

MostwearindicationswereobservedonallCEAstestedbetween(

)Thesignal(

landlocationoftheseindicationsaresummarizedinTableI.

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In order to determine the magnitude of wear associated with a given indication, thesignal( _ )for that indication must be compared to that obtained from ti sting of a standard with wear simulations of known geometry. A descrip:. ion of the wear standards used in this program and the corresponding signal ( ,

)ispresentedinTableII. Notethatthesignal( )

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.dependsonthe( )

Standard #1consistsoff

)andwasused,intheE0C4testingsoresultscouldbe evaluated against those obtained following Cycle 3 using the same standard.

Since the E0C 3 testing performed in 1979, a new standard was prepared which

(-

! thisnewstandardare(

)Basedon L the use of this new standard, the estinates of wear (

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This factor applies to both the E0C 3 and E0C 4 inspection results.

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The(, )oftheaveragewearindication,perCEAfollowingCycle4 rangesfrom( )CEA( )

alsoexhibitsthemaximumwearsignalof( )whichcorrespondstoa wear value of approximately( )

ThemeasurementsofCEA's( )taken in 1979 following Cycle 3 have been reported in Reference 1. Theaverageindication( )for these CEA's following Cycle 3 was( )whichcorrespondedto(

.)Themaximumindicationwas(

.)whichcorrespondedtoapproximately(

b Measurements taken on these same CEA's following Cycle 4 resulted in anaverageindication( )ofabout( )withamaximumof(

)Thesesignalscorrespond toanaveragewearestimateof( )anda maximumwearestimateofapproximately( ) Considering the

. estimated overall measurement uncertainty of the ;G cidy current test system off ) comparison of the E0C-3 and E0C-4 results on these( )CEA's indicatethatno(

- ) I.This degree of wear is acceptible for continued CEA operation sincethewearis( )(Reference 1). It snould be added that comparison of data between different inspection programs must be basedon( . )Thisisbecause

!' instrument ( .)canvaryslightlyfromonetestseriestoanother resultingindifferent( )

B. SLEEVE WEAR 3

. ( )dischargedBatchDfuelassemblies,fromcorelocationsshownin Figure 2, were eddy current tested to deterrine the presence and extent of I sleeve wear. These assemblies were chosen on the basis of operation in

( )Allassemblieswere sleevedinthe( )conditionpriortooperationunderCEA's.

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' The results of the sleeve w;ar testing, summarized in Table III, show no

• indication of sleeve wear in any of the fuel assemblics tested. It should be noted that the eddy current test method uti.lized is capable of detecting I

. sleeve wear to a m niimum o f(

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4 h l Reference 1. " Response to Recuest for Additional Information CEA Guide Tube Inspection Program Calvert Cliffs Unit No. 2, Docket No. 50-313", CEN-116 (B)-P, dated October 8, 1979.

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TABLE'I BG&E UNIT 1 END-OF-CYCLE 4 CEA WEAR TESTING RESULTS I

r 3 APPROXIMATE LOCATIC:!

3 CEA f;0. RESULTS ? . (I;:CSES n~'! EA BOTTOM)

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TABLE I CONT.

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g s APPROXIMATE LOCATI0fl CEA NO. RESULTSI ) (INCHES FR0:1 CEA BOTTOM) r s 1

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• CORRELATI0ti: EDDY CURRENT TEST STAi!DARD SIGMAL VS. WEAR r s

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WEAR SI!!ULATIO 1 AVERAGE l( ) SIGNALI, )

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, WEAR SIMULATI0ri AVERAGE SIG?iAL

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-TABLE III EDDY Ct!RRENT TEST RESULTS i BG&E 1 SLEE7E HEt,R

.1980 REFUELI: G OUTAGE i'

?. FUEL ASSEMBLY' GUIDE' TUBE

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flote: Bank 5 is the 7_ -

regulvting CEA Bank (X)CEAdankIdentity M

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Figure 1 Core Locations of CEA's Durinq Lycles I thru 4 C

P,9) for Ct.A's that were ~ /

eddv curr'>nt tested tollowing Lycle 4

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