ML20080C280

Flaw Disposition Evaluation Basis

ML20080C280
Person / Time
Site:	Quad Cities
Issue date:	01/18/1984
From:	NUTECH ENGINEERS, INC.
To:
Shared Package
ML20080C268	List: ML20080C262 ML20080C280 ML20080C290 ML20080C309
References
NUDOCS 8402080038
Download: ML20080C280 (3)

Text

,*.

c.  : r.

Attachment 1

- ATTACHMEt4T TO LETTER

^RHB-84-007 i

' COMMONWEALTH EDISON COMPANY QUAD CITIES UNIT 2 FLAW DISPOSITION EVALUATION BASIS e

7 Ja nuary 18, 1984 NUTECH Engineers San Jose, California 1-i l'

• 1 4

~

'~ ~

~

. 8402080038 840127 PDR ADOCK 05000265 G PDR l

~

l

. - - . . , - . , - - ...,,e-, , , , , , .--.-,,-.-.-.=-._.,.,-,.,,..m.. . . - - . , . - - - . . - ~ . . - - - . .

> OthD CITIES UNIT 2 FLAW DISPOSITION EVALLATION BASIS III Flaw Characterization (2)

Pipe Crack Max. %1d Weld ID Dianeter Type Depth Iength Iocation Disposition IHSI'd 0 2D--S3 12" Cire. 25% 0.5" Pioe Side Isave As-Is Yes 02D-F6 12" Cire. 80% 8.0" Pipe Side Overlay tb 02P-F6 12" Circ.(2) 15% 360* Int Upstream Pipe Overlay Yes 0 23-S 3 12" Circ. 32% 2.25" Pipe Side overlay Yes 02J-F6 12" Circ.(2) 15% 15.0" Pipe Side Overlay Yes 02M-S3 12" Ci rc. 13% 1.0" Pipe Side Isave As-Is Yes 30% 1.5" Elbow Side 02M-S4 12" Circ. 9% 0.5" Elbcw Side Isave As-Is Yes 02AS-S4 28" Circ. 13% 21.0" total Elbow Side Isave As-Is Yes 11% 4.0" Pipe Side 02AS-S6 28" Circ. 21% 7.0" Upstream Pipe Isave As-Is Yes 02AS-69 28" Axial 10% 0.5" Elbow Side Oierlay Yes Circ. 22% 24.0" total Elbow Side 02AS-S12 28" Circ. 9% 3.0" total Elbow Side leave As-Is Yes Circ. 14% 8.0" Pipe Side 02AS-F14 28" Circ. ( 2 ) (3 ) 30% 43.0" Pipe Side leave As-Is Yes 02AD-F12 28" Circ. 10% 24.0" Pipe Side Isave As-Is Yes 02BS-S3 28" Circ. 40% 12.0" Elbow Side Overlay tb 028S-F7 28" Circ.(2)(3) 16% 360' Int. Pipe Side Overlay Yes 02BS-S12 28" Circ.( 2 ) (3 ) 20% 48.0" Pipe Side Ieave As-Is Yes 02BS-F14 28" Circ. 18% 5.25" total Pipe Side leave As-Is Yes 02BD-S 6 28" Circ. 39% 17.0" Elbow Side Overlay Axial 64% 1.25" Elbow Side 02A-S10 22" Circ. 26% 4.0" Cap Side Isave As-Is Yes 02B-S9 22" Cire. 15% 17.0" Cap Side Isave As-Is Yes 10S-F1 20" Ci re. 11% 6.0" Pipe Side Overlay No 10S-F5 20" Circ. 18% 3.5" Pipe Side Isave As-Is Yes 12% 8.0" Pipe Side 12S-S27 6" Cire. 20% 1.25" Elbow Side Spool Beplace. No NorE: 1) Weld 02M-F7 has been evaluated to have lack of fusion in wld area.

This has been analyzed and it is found acceptable as-is.

2) Flae characterization based on conposite of IMT/ITL results.

3) Additional inspection by UTL and plug sanple of 02BS-S12 confinns that no flaw actually exists.

l l

[

l 1/18/84

4 ATTACHMENT 2 Quad Cities Unit-2 Core Sample Examination A trepan sample approximately 1 inch in diameter was cut from the weld, centered on a punch-mark made by the LMT Level III Examiner at the spot where the depth of the reflector was greatest, according to their shear wave examination. The spot was 24 1/2 inches from the zero point, at 3/8 inch from the weld center line. The sample was examined visually, as was the side of the hole, for any evidence of cracks; none were found. The sample was then given a liquid penetrant test, but again, no evidence of cracking was found. It was then sectioned across the weld, and cut face polished and etched, and then examined on the metallograph. The weld fusion line was clearly evident over the entire sample thickness; with sharp, decidely different microstructure for the celd metal versus the parent metal. No cracks were found on the sample.

A 3600 radiographic examination was made of the weld, using an irridium source, of 55 curies strength, at 14 inch source-to-film distance, in the single-wall mode and using R-type film. A number 17 penetrameter was used, providing muc.1 greater sensitivity than required by ASME Code. Both holes in the penetrameter were visible on all six radiographs. Only one circumferential indication was found. It was 3/16 inches long, 5/16 inches from the weld centerline on the pipe side at 55 inches from the zero mark, and very faint. Borescopic examination of the I.D. at this location showed a tool mark of approximately the same size in the same location. Therefore we concluded from both the pipe sample and radiograph results that no indication of IGSCC cracks existed in this weld.

8018N

.. -