ML042660371
| ML042660371 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/30/2004 |
| From: | Hyres J BWXT, BWXT Services |
| To: | Framatome ANP, Office of Nuclear Reactor Regulation |
| References | |
| ORNL/NRC/LTR-04/15 1140-025-02-24 | |
| Download: ML042660371 (50) | |
Text
BWXT SERVICES, INC.
1140-025-02-24 44 Reference micrograph for EDS results below Figure 2.7.3: The grain boundary (points designated "1") contained carbon, oxygen, aluminum, chromium and nickel.
BWXT SERVICES, INC.
1140-025-02-24 45 BSE 15,000X Figure 2.7.4: The grain boundary (solid fill) contained higher oxygen and chromium compared to the bulk grain (line spectrum) (Note: The BSE image was defocused in order to optimize the EDS count rate.)
BWXT SERVICES, INC.
1140-025-02-24 46 Reference micrograph for EDS semi-quantitative analysis Figure 2.7.5: Reference micrograph and semi-quantitative EDS results for nozzle material. The results appeared consistent with those expected for Alloy 600.
BWXT SERVICES, INC.
1140-025-02-24 47 Figure 2.7.6: SE images of two halves of nozzle open crack sample. In-service cracking was intergranular in nature and extended a maximum ~0.12" deep. The laboratory fracture was ductile. 20X
BWXT SERVICES, INC.
1140-025-02-24 48 Figure 2.7.7: BSE images of two halves of nozzle open crack sample. The darker contrast of the in-service crack indicates the presence of an oxide layer (lab fracture is fresher) 20X
BWXT SERVICES, INC.
1140-025-02-24 49 SE 100X SE 70X Figure 2.7.8: Micrographs showing typical intergranular appearance of in-service crack (top-near ID; bottom-at crack tip).
BWXT SERVICES, INC.
1140-025-02-24 50 BSE image of intergranular facet showing area selected for EDS Figure 2.7.9: EDS spectrum collected from area 1 above. This area contained carbon, oxygen, aluminum, silicon, chromium, iron, and nickel, along with a trace amount of titanium.
BWXT SERVICES, INC.
1140-025-02-24 51 Figure 3.1.1: Top view of as-received cavity sample.
270° 0° 90° 180° Nozzle #11 Bore Nozzle #3 Bore
BWXT SERVICES, INC.
1140-025-02-24 52 Figure 3.1.2: View of as-received cavity sample from nozzle #11 bore side.
270° 180° 90° 0°
BWXT SERVICES, INC.
1140-025-02-24 53 Figure 3.1.3: View of cavity looking toward 90°.
270° 0° 90° 180°
BWXT SERVICES, INC.
1140-025-02-24 54 Figure 3.1.4: View of cavity looking toward 270°.
270° 180° 90° 0°
BWXT SERVICES, INC.
1140-025-02-24 55 Figure 3.1.5: Looking toward 180°.
270° 180° 90° 0°
BWXT SERVICES, INC.
1140-025-02-24 56 Figure 3.1.6: View of cavity looking toward nose (~10°).
270° 180° 90° 0°
BWXT SERVICES, INC.
1140-025-02-24 57 Figure 3.2.1: Photograph showing curing of cavity dental mold.
90° 0° 270° 180° Nozzle #11 Bore
BWXT SERVICES, INC.
1140-025-02-24 58 0° 90° Figure 3.2.2: Photographs of cavity dental mold.
BWXT SERVICES, INC.
1140-025-02-24 59 180° 270° Figure 3.2.2 (cont.): Photographs of cavity dental mold.
BWXT SERVICES, INC.
1140-025-02-24 60 Figure 3.2.3: Photograph showing dental mold of RCS side of cladding.
Nozzle #11 Bore Nozzle #3 Bore Deflected Region 270° 0° 90°
BWXT SERVICES, INC.
1140-025-02-24 61 Figure 3.3.1: Initial cavity sample section locations (cuts #1, #2, and #3).
0° 180° 90° 270° B
A C
D
BWXT SERVICES, INC.
1140-025-02-24 62 Cut #4 location Cut #5 location Figure 3.3.2: Photographs showing locations of cut #4 (top) and cut #5 (bottom).
Piece A2 contained the exposed cladding.
A2 - Bottom A1 - Top Cut #5 Cut #4 D2 - Bottom D1 - Top
BWXT SERVICES, INC.
1140-025-02-24 63 Figure 3.4.1: PT results for cut #3. A small weld void was present near the root of the nozzle #11 J-groove weld. Normal photo is on the left, black light photo on right. There was no evidence of cladding disbond noted on any of the cut faces examined. ~1X RV Head J-groove weld
BWXT SERVICES, INC.
1140-025-02-24 64 Figure 3.4.2: Circumferential indications on RCS side of cladding from ~0° to 45°.
No indications were present in the upward-deflected region of the cladding.
Circumferential indications Deflected region
BWXT SERVICES, INC.
1140-025-02-24 65 Figure 3.4.3: PT results for nozzle #3 J-groove weld bore and cladding underside.
The J-groove weld contained an axial indication near 10° on the bore ID and circumferential indications on the RCS side from ~20° to ~45°.
0o 90o 180o 270o Axial indication Circumferential indications
BWXT SERVICES, INC.
1140-025-02-24 66 Figure 3.4.4: PT results for upper surface of exposed J-groove weld. The axial crack is visible near 10° (rough weld texture produced high PT background).
BWXT SERVICES, INC.
1140-025-02-24 67 Figure 3.5.1: Photographs showing exposed cladding surface. The gray mask in the lower photograph was used to calculate the exposed cladding surface area.
BWXT SERVICES, INC.
1140-025-02-24 68 Figure 3.5.2: Photographs showing clad thickness setup (top) and coordinate system (bottom).
BWXT SERVICES, INC.
1140-025-02-24 69 Figure 3.5.3: Cladding thickness measurements.
1 inch 270° 0° 90° 180° (0,0) 0.202" (min) 0.314" (max)
BWXT SERVICES, INC.
1140-025-02-24 70 Figure 3.5.4: Colorized representation of clad thickness measurements.
BWXT SERVICES, INC.
1140-025-02-24 71 Figure 3.5.5: Colorized representation of exposed cladding profile. Red area denotes area of maximum deflection.
BWXT SERVICES, INC.
1140-025-02-24 72 Figure 3.5.6: Colorized representation of bottom surface of cladding (RCS side).
Red area denotes area of maximum deflection.
BWXT SERVICES, INC.
1140-025-02-24 73 Figure 3.5.7: Exposed cladding surface with superimposed colorized thickness data.
The thinnest areas of cladding occurred adjacent to the J-groove weld toward the 90° (0.202") and 270° (0.208") locations.
270° 0° 90°
BWXT SERVICES, INC.
1140-025-02-24 74 Figure 3.6.1: Photograph showing crack in exposed cladding in deflected region.
Red dot indicates (0, 0) coordinates for thickness measurements.
BWXT SERVICES, INC.
1140-025-02-24 75 Figure 3.6.2: Mosaic showing cracking in exposed cladding. 2X
BWXT SERVICES, INC.
1140-025-02-24 76 Figure 3.6.3: Higher magnification view of cladding crack in bulged region. ~4X
BWXT SERVICES, INC.
1140-025-02-24 77 Figure 3.6.4: Higher magnification photograph of crack near center bulge. 25X
BWXT SERVICES, INC.
1140-025-02-24 78 Figure 3.6.5: Low magnification photograph of the cavity underside. The red circle shows the area of maximum deflection. The white dots were applied at Davis-Besse for the UT thickness measurements. The two parallel lines toward the left indicate the Nozzle 11 position, which is outside the photo on the left. This maximum bulging area is shown at higher magnification in the next figure.
BWXT SERVICES, INC.
1140-025-02-24 79
~0.9X 5X Figure 3.6.6: Higher magnification photographs of cavity underside in area of maximum deflection. No cracks were observed in this area.
BWXT SERVICES, INC.
1140-025-02-24 80 Looking at J-groove weld bore near 10°. ~1.2X Top view of J-groove weld crack near 10°. ~1.4X Figure 3.6.7: Photographs showing axial crack in nozzle #3 J-groove weld near 10°.
Nozzle
BWXT SERVICES, INC.
1140-025-02-24 81 Figure 3.6.8: Axial cracks located on J-groove weld bore near 180°. ~0.75X
BWXT SERVICES, INC.
1140-025-02-24 82 Looking toward 90° ~0.7X Looking toward 270° ~0.5X Figure 3.6.9: Low magnification photographs of cavity sidewall.
BWXT SERVICES, INC.
1140-025-02-24 83 Sidewall detail near 90° (nozzle #3 bore to right). ~1X Sidewall detail near 270° (nozzle #3 bore to lower left). ~1.2X Figure 3.6.10: Higher magnification photographs taken near the nozzle #3 bore.
BWXT SERVICES, INC.
1140-025-02-24 84 Detail of side wall near 270°. ~1.7X Looking up at cavity nose. ~0.7X Figure 3.6.11: Photographs showing the cavity sidewall near 270° (top) and looking up at the cavity nose (bottom).
BWXT SERVICES, INC.
1140-025-02-24 85 Near 30° 5X Near 315° 5X Figure 3.6.12: Photographs showing undercut regions of cavity near 30° (top) and 315° (bottom).
BWXT SERVICES, INC.
1140-025-02-24 86 Figure 4.1.1: Schematic showing section locations and sample identifications for Block "B".
Weld Direction
BWXT SERVICES, INC.
1140-025-02-24 87 Figure 4.1.2: Schematic showing tensile specimen locations. The polished surface of piece B2C2B3 (met sample) is also indicated.
Weld Direction
BWXT SERVICES, INC.
1140-025-02-24 88 6X Figure 4.2.1: Macro photograph of Sample B2C2B3 showing the low alloy steel stainless steel interface and various grain structures within the low alloy steel HAZ.
Acicular Fine-Grained Coarse-Grained 0.1 inch Low Alloy Steel Stainless Clad
BWXT SERVICES, INC.
1140-025-02-24 89 100X 375X Figure 4.2.2: Typical low alloy steel microstructures near bond. 2% nital
BWXT SERVICES, INC.
1140-025-02-24 90 100X 375X Figure 4.2.3: Typical low alloy steel microstructures 1/4" from bond. 2% nital
BWXT SERVICES, INC.
1140-025-02-24 91 100X 375X Figure 4.2.4: Typical low alloy steel microstructures ~1/2" from bond. 2% nital
BWXT SERVICES, INC.
1140-025-02-24 92 100X 375X Figure 4.2.5: Typical cladding microstructures near bond.
(Acetic-nitric-hydrochloric etch)
BWXT SERVICES, INC.
1140-025-02-24 93 100X 375X Figure 4.2.6: Typical cladding microstructures away from bond.
(Acetic-nitric-hydrochloric etch)