## Abstract

SKB has asked Inspecta Technology AB to perform a damage tolerance analysis of the cast iron insert for the case of an earthquake induced rock shear load. This report contains results of a fracture mechanics analysis of the insert with postulated defects. The aim of the analyses is to calculate acceptable defect sizes with regard to safety margins against fracture. Defects are postulated at a location where the max principal stress is the highest (at the outer surface of the insert). Results from the damage tolerance analysis show that the density of the bentonite clay has an important effect on the calculations. The main conclusions are: - Higher density gives higher J-values and smaller accepted defect sizes. - It is also seen that the elliptical surface defects give much higher J-values than the circular surface defects. - The internal defects do not give as high J-values as the surface defects. - For the design case, bentonite density = 2,050 kg/m3 and shear = 5 cm, the acceptable defect depth = 4.5 mm and the acceptable defect length = 27.0 mm (using the most severe defect geometry assumption of a postulated semi-elliptical surface crack). Other defect geometry assumptions, defect locations and
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## Citation Formats

Dillstroem, Peter, and Bolinder, Tobias.
Damage tolerance analysis of canister inserts for spent nuclear fuel in the case of an earthquake induced rock shear load.
Sweden: N. p.,
2010.
Web.

Dillstroem, Peter, & Bolinder, Tobias.
Damage tolerance analysis of canister inserts for spent nuclear fuel in the case of an earthquake induced rock shear load.
Sweden.

Dillstroem, Peter, and Bolinder, Tobias.
2010.
"Damage tolerance analysis of canister inserts for spent nuclear fuel in the case of an earthquake induced rock shear load."
Sweden.

@misc{etde_1010814,

title = {Damage tolerance analysis of canister inserts for spent nuclear fuel in the case of an earthquake induced rock shear load}

author = {Dillstroem, Peter, and Bolinder, Tobias}

abstractNote = {SKB has asked Inspecta Technology AB to perform a damage tolerance analysis of the cast iron insert for the case of an earthquake induced rock shear load. This report contains results of a fracture mechanics analysis of the insert with postulated defects. The aim of the analyses is to calculate acceptable defect sizes with regard to safety margins against fracture. Defects are postulated at a location where the max principal stress is the highest (at the outer surface of the insert). Results from the damage tolerance analysis show that the density of the bentonite clay has an important effect on the calculations. The main conclusions are: - Higher density gives higher J-values and smaller accepted defect sizes. - It is also seen that the elliptical surface defects give much higher J-values than the circular surface defects. - The internal defects do not give as high J-values as the surface defects. - For the design case, bentonite density = 2,050 kg/m3 and shear = 5 cm, the acceptable defect depth = 4.5 mm and the acceptable defect length = 27.0 mm (using the most severe defect geometry assumption of a postulated semi-elliptical surface crack). Other defect geometry assumptions, defect locations and defect orientations give larger acceptable defect sizes}

place = {Sweden}

year = {2010}

month = {Oct}

}

title = {Damage tolerance analysis of canister inserts for spent nuclear fuel in the case of an earthquake induced rock shear load}

author = {Dillstroem, Peter, and Bolinder, Tobias}

abstractNote = {SKB has asked Inspecta Technology AB to perform a damage tolerance analysis of the cast iron insert for the case of an earthquake induced rock shear load. This report contains results of a fracture mechanics analysis of the insert with postulated defects. The aim of the analyses is to calculate acceptable defect sizes with regard to safety margins against fracture. Defects are postulated at a location where the max principal stress is the highest (at the outer surface of the insert). Results from the damage tolerance analysis show that the density of the bentonite clay has an important effect on the calculations. The main conclusions are: - Higher density gives higher J-values and smaller accepted defect sizes. - It is also seen that the elliptical surface defects give much higher J-values than the circular surface defects. - The internal defects do not give as high J-values as the surface defects. - For the design case, bentonite density = 2,050 kg/m3 and shear = 5 cm, the acceptable defect depth = 4.5 mm and the acceptable defect length = 27.0 mm (using the most severe defect geometry assumption of a postulated semi-elliptical surface crack). Other defect geometry assumptions, defect locations and defect orientations give larger acceptable defect sizes}

place = {Sweden}

year = {2010}

month = {Oct}

}