(f 20MSUST10. ENGINEERING, IN . 1981 CALVERT CLIFFS II PEF ...
Transcript of (f 20MSUST10. ENGINEERING, IN . 1981 CALVERT CLIFFS II PEF ...
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(f 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.
THIS REPORT .VAS PREPARED AS AN ACCOUNT OF WORK SPONSOREDBY COMBUSTION ENGINEERING, INC. NEITHER COMBUSTION ENGINEERINGNOR ANY PERSON ACTING ON ITS BEHALF: ,
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A. MAKES ANY WARRANTY OR R EPR ES ENT ATION, EXPRESS ORIMPLIED 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 CC''T AINED IN THISREPORT, 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 PRIVATELYOWNED RIGHTS;CR
E. ASSUMES ANY LI ABILITIE3 'AITH RESPECT TO THL USE OF. On FORDAMAGES 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,
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 testedf llowing Cycle 2 (Ref.1). The purpose of the eddy current inspecticns was
tolocateandquantifypotentialwearatthe( .
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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 observedThe eddy current data collected en could not be interpreted
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with any certainty due to electronic and mechanical equipment problemsencountered during the inspection activity at the site. Consequen.ly no
data are presented for tnis CEA.
Thesignalf I from these CEA's are summarized inJ
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 correspondingsignall .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~
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and wa: the same standard used in. .
the EOC-2 measurements at Calvert Cliffs II.
I 'of the average indicated wear following Cjcle 3 rangesThe [ ] . -r
from CEAl also exhibitsL -> .
.- 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 measurementuncertainty 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,
approximatewearestimatewasi while at EOC-3 the approximate-'
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wear e.wimate was for this indication. It should be added i,
that comparison of data between different inspection programs.must be basedupon 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.
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 #2Docket 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
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~ CORRELATION: EDDY CURREriT TEST STANDARD SICNfsL lVS. WEAR
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WEAR STANDARD (INCONEL 625 TUBING).
WEAR SIMULATION AVERAGE ...
SIGNAL.
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*CORRELATIONS APPLY TO CALVERT CLIFFS II EOC-3 INSPECTIC!4 DNLY
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CORE LOCATIONS OF CEA's DURITIG ChCLES 1 TilRU 3 FOR CEA'S TilAT WERE EDDY CURREilT TESTED AFT.R CYCL.ES 2 AfiL' 3FIGURL 1.
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