ML19093B105

08/11/1978 Letter Results of Inspection Program on Steam Generator Eddy Current

ML19093B105
Person / Time
Site:	Surry
Issue date:	08/11/1978
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	O'Reilly J NRC/IE, NRC/RGN-II
References
Download: ML19093B105 (5)

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EDDY CURRENT INSPECTION REPORT REFUELING OUTAGE NO. 4 UNIT NO. 1 MAY 1978 VIRGINIA ELECTRIC AND POWER COMPANY

e e VIRGINIA ELECTRIC AND POWER COMPANY SURRY NO. 1 MAY 1978 EDDY CURRENT INSPECTION In May 1978, Eddy Current Inspection was performed by VEPCO on the tubes 11 in Loops "A", "B", and C11 Stearn Generators. The inspection*prograrn was per-forrnep to re~nspect those areas found to have eddy current indications during the previous inspection; and to inspect areas which are suspected to have in-dications. The Eddy Current Inspection was conducted in accordance with VEPCO Procedure NDT-14.1, and Regulatory Guide 1.83. This program specified examina-tions at 400 KHZ to detect and measure potential tube defects.

AU-Bend Inspection of all available tubes in the first five rows was

~onducted from the Cold Leg in each steam generator at 100 KHZ. This inspec-tion revealed no detectable defects in the u-*Bend regions. A gaging inspec-tion was also performed in the Cold Leg.

Additional gaging inspections were donducted in the Hot Leg of *each steam generator. This gaging program was based on past experiences, and to an extent, was run in conjunction with the Regulatory Guide inspection.

After completion of the inspection, 20 tubes were explosively plugged in 11 "A" Stearn Generator, 31 tubes in "B" Steam Gener_ator, and 53 bubes in C11 Stearn Generator. A breakdown of the tube plugging is:

S.G. >40% Indications Mistakes Gaging "A" 2 0 18 "B II 0 0 31 6 6 41

-z-e e Explosive plugging was performed by Westinghouse in accordance with Pro-cess Specification NPT-33.

A stnnmary of the inspection program per steam generator follows.

"A" STEAM GENERATOR A total of 2,425 tubes were inspected at 400 KHZ in the Hot Leg.

1,568 tubes were checked thru the U-Bend. 103 tubes were checked past the 7th Support. 754 tubes were inspected past the 1st Support to reinspect problem areas from previous years.

Of the total, 109 had indications of 0.D. tube defects (only those tubes that showed defect indications are included in thls report). A breakdown of the indications is as follows:

39 tubes< 20% defect, 30 tubes 20-29%, 38 tubes 30-39%,

2 tubes> 40%

A total of 20 tubes were plugged in "A" Steam Generator. In addition to the tubes found to have indications 40%. 18 tubes were plugged due to

. the gaging data collected.

There are a total of 790 tubes plugged in "A" steam generator.

"B" STEAM GENERATOR A total of 2,273 tubes were inspected at 400 KHZ in the Hot Leg.

486 tubes were checked. thru the U-Bend. 1,179 tubes were checked past .

the 7th Support. 608.tubes were inspected past the 1st Support to reinspect problem areas from prev~ous years.

Of the total, 64 had indications of O.D. tube defects (only those tubes that showed defect indications are included in this report). A breakdown of all indications is as follows:

38 tubes< 2% defect, 15 tubes 20-29%, 11 tubes 30-39%*

0 tubes ~ 40%

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A total of 31 tubes were plugged in "B" Steam Generator due to the gaging data collected.

There are a total of 574 tubes plugged in "B" Steam Generator.

"C" STEAM GENERATOR A total of 2,074 tubes were inspected at 400 KHZ in the Hot Leg.

1,002 tubes were checked through the U-Bend. 603 tubes were checked past the 7th Support. 469 tubes were inspected past the 1st Support to re-inspect problem areas of previous years.

Of the total 49 had indications of O.D. tube defects (only those tubes that showed defect indications are included in this report). A breakdown of the indication is as follows:

12 tubes < 20%, 10 tubes 20-29%, 22 tubes 30-39%, 6 tubes 40%.

11 A total of 53 tubes were plugged in C" Steam Generator. Inaddition to the 6 tubes found to have indications_:_ 40%, 41 tubes were plugged due to the gaging data collected. Six (6) tubes were plugged in error.

There are a total of 850 tubes plugged in "C" Steam Generator.