ML19240B960

Nonproprietary Version of 1981 Calvert Cliffs Unit 2 Refueling Outage:End of Cycle 3 Eddy Current Insp Results on Control Element Assemblies.

ML19240B960
Person / Time
Site:	Calvert Cliffs
Issue date:	03/05/1981
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:
Shared Package
ML19240B958	List: ML19240B957 ML19240B959 ML19240B960
References
CEN-154(B)-NP, NUDOCS 8104170384
Download: ML19240B960 (7)

Text

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O 20MSUST10. ENGINEERING, IN .

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1981 CALVERT CLIFFS II PEF;'ELING OUTAGE END OF CYCLE 3 EDDY CURRENT INSPECTION RESULTS ON CONTROL ELEMENT ASSEMBLIES (CEA's)

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CEN-154 (B)-NP

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MARCH 5, 1981 01170 3 8

LEGAL NOTICE

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THIS REPORT .VAS PREPARED AS AN ACCOUNT OF WORK SPONSORED BY COMBUSTION ENGINEERING, INC. NEITHER COMBUSTION ENGINEERING

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NOR ANY PERSON ACTING ON ITS BEHALF: ,

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A. MAKES ANY WARRANTY OR R EPR ES ENT ATION, EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF F#TNESS FOR A P* RTICULAR PURPOSE OR ME R CH AN T A BI LIT Y. WITH n';S PE CT TO 1HE ACCURACY, COMPLETENESS, CR USEFULNESS OF THE INFORMAT'ON CCT AINED IN THIS REPORT, OR TH AT T HE USE O F AN Y INF ORMATIOrs, APP AR ATUS, *.'.E T HOD, '.

OR PROCESS DISCLOSED IN THIS REPORT MAY Nf]T INF RINGE PRIVATELY OWNED RIGHTS;CR E. ASSUMES ANY LI ABILITIE3 'AITH RESPECT TO THL USE OF. On FOR DAMAGES RESULTING FRCM THE USE OF, ANY INFORf.1ATION, APPAR ATUS.

METHOD OR FROCESS DISCLOSED IN This REFORT.

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A. CEA EDDY CURRE."T TEST RESULTS

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were eddy current tested during the Calvert

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C iffs II EGC-3 refueling outage in January, 1981. The CEA's resided in tle core positicns shown in Figure 1 and had been eddy current tested f llowing Cycle 2 (Ref.1). The purpose of the eddy current inspecticns was tolocateandquantifypotentialwearatthe( .

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d The testing was performed in accordance with approved C-E procedures for the detection of CEA wear. The, of each CEA finger was in-spected with an encircling eddy current coi!.

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At E0C-3, sli;,nt indications of wear were observed

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The eddy current data collected en ,

could not be interpreted with any certainty due to electronic and mechanical equipment problems encountered during the inspection activity at the site. Consequen.ly no data are presented for tnis CEA.

I from these CEA's are summarized in Thesignalf J Table 1. In order to cetermine the magnitude of wear associated witn a given signal,the signal , ,

in each case must be compared to signals obtained from testing a standard with wear simulations of known size and gecmetry. A description of the wear standard, used in t.his progran, and the corresponding signall .easured at ECC-3 is presented in Table 2.  !!ote that the signal

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depends' upon thE

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• Thestandardusedinthisprogramconsistsoff L

and wa: the same standard used in

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the EOC-2 measurements at Calvert Cliffs II.

I 'of the average indicated wear following Cjcle 3 ranges The [ ] .

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from

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CEAl L -

also exhibits

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tne maximum wear signal of which correspcnds to a wear value of approximately

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Measurements on the scme fingers at EOC-2 showed as measured after Cycle 3 considering the estimated overall measurement uncertainty , ,

of the CEA eddy current test system. After Cycle 3

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the maximum signal was found in the Af t .- Cvele 2 the ,

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approximatewearestimatewasi -

while at EOC-3 the approximate-L .

wear e.wimate was ,

for this indication. It should be added i that comparison of data between different inspection programs.must be based upon Equipment can vary

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from one test series to another resulting' in different ~

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The degree of wear measured in the CEA's at EOC-3 is acceptable for

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continued CEA operation since the measured wear is less than

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(Ref. 2).

B. VISUAL INSPECTION

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The lower of was visually inspected by TY. No anomalies

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were observed on any finger and no perceptible diameter variations were observed at any of the wear locations.

REFERENCES -

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1. "Results of the CEA Guide Tube Inspection Program, Calvert Cliffs Unit #2 Docket No. 50-318", CEN-118 (B)-P, November 8, 1979

2. " Response to Request 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 1 CALVERT CLIFFS II END-OF-CYCLE 3 CEA 'n' EAR TEST RESULTS

, APPROXIF. ATE LOCATION CEA NO. FINGER RESULTS _

(It'CHES FROM CEA BOTTOM)

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TABLE 2

~ CORRELATION: EDDY CURREriT TEST STANDARD SICNfsL lVS. WEAR

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WEAR STANDARD (INCONEL 625 TUBING)

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. WEAR SIMULATION . AVERAGE .

SIGNAL

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• CORRELATIONS APPLY TO CALVERT CLIFFS II EOC-3 INSPECTIC!4 DNLY

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FIGURL 1 CORE LOCATIONS OF CEA's DURITIG ChCLES 1 TilRU 3 FOR CEA'S TilAT WERE EDDY CURREilT TESTED A

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