ML15223A382

NRC000221F - Babcock & Wilcox Report, S-1473-002, Final Report, Rev. 0, Examination of Clevis Bolts Removed from D. C. Cook Nuclear Plant (Dec. 2013)

ML15223A382
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: ML15223A382 (23)

Text

NRC00221F Submitted: August 10, 2015 B&W Technical Services Group S-1473-002 102 B&W Technical Services Group S-I 473-002 102 Figure 94: Same area as uspgo~rIG -" nl~al ell

B&W Technical Services Group S-1473-002 103 Figure 96: Same area as after phosphoric + nital etch. 18OX

B&W Technical Services Group S-1473-002 104 X.

Figure C, 660X.

B&W Technical Services Group S-1473-002 105 B&W Technical Services Group S-1473-002 105 Figure area as Figure 99 alter phosphoric + nital etch. 5trL evidenced by the presence of vertical streaks. 6X

B&W Technical Services Group S-1473-002 106 Figure 101: As-polished micrograph montage of crack. Area inside white box is shown at higher magnification in Figure 102. 13X

B&W Technical Services Group S-1473-002 107 B&W Technical Services Group S-I 473-002 107 ure 102: Higher m detail of Figure 101, as-polished. 120X

B&W Technical Services Group S-1473-002 108 B&W Technical Services Group S-I 473-00 2 108 rigure Iju'.; aeconu tira(w near *3

B&W Technical Services Group S-1473-002 109 B&W Technical Services Group S-I 473-002 109 Figure 106: Typical appearance of intermittent duplex grain structure (i.e. large grain in center of micrograph), DIC. 90X

B&W Technical Services Group S-1473-002 110 B&W Technical Services Group S-1473-002 110 Figure Figure FgeDIC, 660X.

B&W Technical Services Group S-1473-002 ill B&W Technical Services Group s-I 473-002 III jpu -I %,I 6X plunge cut. 6X V0 tructure is banded. 6X

B&W Technical Services Group S-1473-002 112 B&W Technical Services Group S-1473-002 113 B&W Technical Services Group S-I 473-002 113 e1 Same area as Figure 111 after etching. Cracking is intergranular, except for transgranular cracking through one large grain (arrows). 180X

B&W Technical Services Group S-1473-002 114 B&W Technical Services Group S-1473-002 115 Figure 1 C.

Figure 1 ', 660X.

B&W Technical Services Group S-1473-002 116 Figure 117: Photograph showing the microhardness locations for I ure 118: Photograph showing the microhardness locations for

B&W Technical Services Group S-1473-002 117 19 LIM FIJIt;IrUFJdF-UFIt:55 Wt;i

B&W Technical Services Group S-1473-002 118 Figure 121: Bolt 24O0-7 at I

B&W Technical Services Group S-1473-002 119 Figure 123: Bolt 300*-1 at 900. Circle radius is 0.069".

B&W Technical Services Group S-1473-002 120 B&W Technical Services Group S-I 473-002 120 Figure 125: Higher magnification three-frame montage of bolt 2400-7 at diamonds are microhardness indents. As-polished, -70X

B&W Technical Services Group S-1473-002 121 B&W Technical Services Group S-I 473-002 121 ire 126: Higher magnification three-frame montage of bolt 240-7 at 3150. Small diamonds are microhardness indents. As-polished, -65X

B&W Technical Services Group S-1473-002 122 B&W Technical Services Group S-1473-002 122 Figure 127: Higher magnification three-frame montage of bolt 300-1 at diamonds are microhardness indents. As-polished, -80X

B&W Technical Services Group S-1473-002 123 B&W Technical Services Group S-I 473-002 123

Higher magnification three-frame montage of bolt 300O-1 at 2700. Small diamonds are microhardness indents. As-polished, -75X

DISTRIBUTION (COMPANY LIMITED): This information is freely available to all Company personnel. Written approval by the sponsoring unit is required only if release outside the Company is requested.

B&W DC Cook MPR J. W. Hyres (1) K. Kalchik (1) G. Thompson (1)

Project File (1)

KEY WORDS: LOWER RADIAL SUPPORT SYSTEM, LRSS, CLEVIS BOLTS, ALLOY X-750, LOW TEMPERATURE CRACK PROPAGATION, INTERGRANULAR STRESS CORROSION CRACKING, IGSCC