ML15223A380

NRC000221E - Babcock & Wilcox Report, S-1473-002, Final Report, Rev. 0, Examination of Clevis Bolts Removed from D. C. Cook Nuclear Plant (Dec. 2013)

ML15223A380
Person / Time
Site:	Indian Point
Issue date:	12/31/2013
From:	NRC/OGC
To:	Atomic Safety and Licensing Board Panel
SECY RAS
References
RAS 28145, ASLBP 07-858-03-LR-BD01, 50-247-LR, 50-286-LR
Download: ML15223A380 (21)

Text

B&W Technical Services GroupS-1473-002 81 B&W Technical Services GroupS-1473-002 82 B&W Technical Services GroupS-1473-002 83 B&W Technical Services GroupS-1473-002 84Figure 63: Stereo microscope photograph showing the open crack surface for bolt 240o-7.The areas within the white rectangles are shown at higher magnification in the following figures.

6X B&W Technical Services GroupS-1473-002 85 B&W Technical Services GroupS-1473-002 86 B&W Technical Services GroupS-1473-002 87 B&W Technical Services GroupS-1473-002 88slCft.fti--- -m ~ -,Y ~ 'U2 4 3 8 Figure 71: EDS spectrum collected from precipitate shown in Figure 70 above. Primaryelements detected included

titanium, nitrogen, and trace amount of nickel and niobium.

B&W Technical Services GroupS-1473-002 89B&W Technical Services Group S-I 473-002 89Ox71C,'.. ,k.. m -Cr ft -M -MMMPý a -Figure 73: EDS spectrum collected from precipitate shown in Figure 72 above. Primaryelements included niobium and titanium; trace levels of iron, chromium, and nickel werealso present.

B&W Technical Services GroupS-1473-002 90B&W Technical Services Group S-I 473-0 02 90II 4 S 1 ..I. 1 sI -0 eFigure 75: EDS spectrum collected from entire area shown in Figure 74. The quantitative results (inset) were generally consistent with nominal X-750.

B&W Technical Services GroupS-1473-002 91ChromiumIronNiobium~%M~~~V ~ ~TitaniumFigure 76: EDS dot maps collected from area shown in Figure 74. Primary constituents arenickel, chromium, and iron, as expected.

Trace amounts of titanium and niobium weredetected at discrete points as well. Carbon was not detected.

B&W Technical Services GroupS-1473-002 92B&W Technical Services Group S-I 473-002 92Figure 78: Same micrograph as80Xiction in area measurements, B&W Technical Services GroupS-1473-002 93B&W Technical Services Group S-I 473-002 93Figure 79: As-polished overview ofFigureame area as Figure 79 after phosphoric

+ nital etch. Structure is banded, asevidenced by the presence of vertical streaks.

6X B&W Technical Services GroupS-1473-002 94B&W Technical Services Group S-1473-002 94Figure 81: As-polished micrograph montage of crack. Area inside white box is shown inFigure 82. -10X B&W Technical Services GroupS-1473-002 95B&W Technical Services Group S-1473-002 95Figure 82: Higher magnjure 81, as-polished.

140X B&W Technical Services GroupS-1473-002 96B&W Technical Services Group S-I 473-002 96Figure B&W Technical Services GroupS-1473-002 97B&W Technical Services Group S-I 473-002 97Figure:h. 180X B&W Technical Services GroupS-1473-002 98B&W Technical Services Group S-1473-002 98Figure1.FigureFme area as 1-igure u aTter pnospnoric

+etch, DIC, 660X.

B&W Technical Services GroupS-1473-002 99-6 cross section as-pcame area as Figure 89 after phosphoric

+ nital etch. Structure is banded asevidenced by the presence of vertical streaks.

6X B&W Technical Services GroupS-1473-002 100Figure 91: As-polished micrograph montage of crack. Area inside white box is shown inFigure 92. -~OX B&W Technical Services GroupS-1473-002 101B&W Technical Services Group S-I 473-002 101detail of Figure 91, as-polished.

140X