ML20027C536

Nonproprietary Version of Results of Eddy Current Testing on Guide Tubes at Calvert Cliffs I After Cycle 5.

ML20027C536
Person / Time
Site:	Calvert Cliffs
Issue date:	08/31/1982
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:
Shared Package
ML19301B879	List: ML20027C531 ML20027C536
References
CEN-216(B), NUDOCS 8210180133
Download: ML20027C536 (7)

Text

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• COMBUSTION ENGINEERING INC.

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. RESULTS OF EDDY CURRENT TESTING ON GUIDE TUBES AT CALVERT,; CLIFFS I AFTER CYCLE 5 .

CEN-216(B)

AUGUST, 1982 8210180133 820922 PDR ADOCK 05000317 G PDR

LEGAL . NOTICE

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

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A. MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, WITH RESPECT TO THE ACCURACY, COMPLETENESS, OR USEFULNESS OF THE INFORMATION CONTAINED IN THIS REPORT, OR THAT THE USE OF ANY INFORMATION, APPARATUS, METHOD, OR PROCESS DISCLOSED IN THIS REPORT MAY NOT INFRINGE PRIVATELY OWNED RIGHTS;OR <.

B. ASSUMES ANY LIABILITIES WITH RESPECT TO THE USE OF, OR FOR DAMAGES RESULTING FROM THE USE OF, ANY INFORMATION, APPARATUS, METHOD OR PROCESS DISCLOSED IN THIS REPORT.

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m Cycle 5 at Calvert Cliffs I contained 16 Batch F and 16 Batch G fuel assemblies witha( ]designmodificationintendedtomitigateguidetube wear. These 32 assemblies were irradiated under CEA's for only one cycle (Cycle 5) in the core locations shown in Figure 1.

To detect wear, each guide tube in the 32 assemblies was addy current tested

.with a bobbin coil during the EOC-5 refueling outage. Preliminary results were reported to the NRC in Ref. 1. Small wear indications were observed in

[.guidetubesdistributedthroughoutl$ assemblies.(Figure 2).

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Nine guide tubes distributed among five assemblies

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were selected for additional examinations with an azimuthal eddy .

current probe to define the circumferential wear pattern. The results of these measurements are in agreement with results measured with the bobbin coil. Table 1 shows the results of azimuthal testing on the single guide tube exhibiting the largest signal detected with the azimuthal coil. ~

of the multiple wear indications in this guide tube showed less than 20% of

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Four assemblies with the -

modification are under CEA's in Cycle 6[, 'None of these assemblies had detectable l

l wear after Cycle 5.

REFERENCES 5.

1. A. E. Lundvall to R. A. Clark, "Calvert Cliffs Nuclear Power Plant Unit 1

b No. 1, Docket No. 50-317, Modified CEA Guide Tube Evaluation Program,"

j May 21, 1982.

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. TABLE 1

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l WEAR INDICATIONS FROM - ]

. AZIMUTHAL EDDY CURRENT TESTING OF_. i 1

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FIGURE 1. LOCATION OF ASSEMBLIES IN CYCLE 5

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FIGURE 2 ASSEMBLIES AND GUIDE TUBES -

AFTER CYCLE 5 AT CALVERT CCIFFS I