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

NRC00221E Submitted: August 10, 2015 B&W Technical Services Group S-1473-002 81

B&W Technical Services Group S-1473-002 82 B&W Technical Services Group S-1473-002 83 B&W Technical Services Group S-1473-002 84 Figure 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 Group S-1473-002 85 B&W Technical Services Group S-1473-002 86 B&W Technical Services Group S-1473-002 87 B&W Technical Services Group S-1473-002 88 slCft.ft

- m~

i - ,Y ~ 'U 2 4 3 8 *3WV Figure 71: EDS spectrum collected from precipitate shown in Figure 70 above. Primary elements detected included titanium, nitrogen, and trace amount of nickel and niobium.

B&W Technical Services Group S-1473-002 89 B&W Technical Services Group S-I 473-002 89 Ox 71 C, m MMMPý a Cr

'.. ,k ft - -

M Figure 73: EDS spectrum collected from precipitate shown in Figure 72 above. Primary elements included niobium and titanium; trace levels of iron, chromium, and nickel were also present.

B&W Technical Services Group S-1473-002 90 B&W Technical Services Group S-I 473-0 02 90 I

I 4 1 . .I. 1 S sI - 0 e Figure 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 Group S-1473-002 91 Chromium Iron Niobium

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Titanium Figure 76: EDS dot maps collected from area shown in Figure 74. Primary constituents are nickel, chromium, and iron, as expected. Trace amounts of titanium and niobium were detected at discrete points as well. Carbon was not detected.

B&W Technical Services Group S-1473-002 92 B&W Technical Services Group S-I 473-002 92 Figure 78: Same micrograph as iction in area measurements, 80X

B&W Technical Services Group S-1473-002 93 B&W Technical Services Group S-I 473-002 93 Figure 79: As-polished overview of Figure ame area as Figure 79 after phosphoric + nital etch. Structure is banded, as evidenced by the presence of vertical streaks. 6X

B&W Technical Services Group S-1473-002 94 B&W Technical Services Group S-1473-002 94 Figure 81: As-polished micrograph montage of crack. Area inside white box is shown in Figure 82. -10X

B&W Technical Services Group S-1473-002 95 B&W Technical Services Group S-1473-002 95 Figure 82: Higher magn jure 81, as-polished. 140X

B&W Technical Services Group S-1473-002 96 B&W Technical Services Group S-I 473-002 96 Figure

B&W Technical Services Group S-1473-002 97 B&W Technical Services Group S-I 473-002 97 Figure :h. 180X

B&W Technical Services Group S-1473-002 98 B&W Technical Services Group S-1473-002 98 Figure 1.

Figure Fme area as 1-igure u aTter pnospnoric + etch, DIC, 660X.

B&W Technical Services Group S-1473-002 99

-6 cross section as-pc ame area as Figure 89 after phosphoric + nital etch. Structure is banded as evidenced by the presence of vertical streaks. 6X

B&W Technical Services Group S-1473-002 100 Figure 91: As-polished micrograph montage of crack. Area inside white box is shown in Figure 92. -~OX

B&W Technical Services Group S-1473-002 101 B&W Technical Services Group S-I 473-002 101 detail of Figure 91, as-polished. 140X