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

CEN-154 (B)-NP MARCH 5, 1981 01170 3 8

LEGAL NOTICE THIS REPORT .VAS PREPARED AS AN ACCOUNT OF WORK SPONSORED BY COMBUSTION ENGINEERING, INC. NEITHER COMBUSTION ENGINEERING NOR ANY PERSON ACTING ON ITS BEHALF: ,

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.

A. CEA EDDY CURRE."T TEST RESULTS were eddy current tested during the Calvert 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( .

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!.

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

~~ e .

depends' upon thE

~

i

~ l

• Thestandardusedinthisprogramconsistsoff L

and wa: the same standard used in the EOC-2 measurements at Calvert Cliffs II.

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

r -

from CEAl L -

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

}

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

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 from one test series to another resulting' in different ~

The degree of wear measured in the CEA's at EOC-3 is acceptable for continued CEA operation since the measured wear is less than (Ref. 2).

B. VISUAL INSPECTION

' ~

The lower of was visually inspected by TY. No anomalies were observed on any finger and no perceptible diameter variations were observed at any of the wear locations.

REFERENCES -

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.

e

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) 9.

b e

S

TABLE 2

~ CORRELATION: EDDY CURREriT TEST STANDARD SICNfsL lVS. WEAR WEAR STANDARD (INCONEL 625 TUBING)

. WEAR SIMULATION . AVERAGE .

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

• 6

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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