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• Proceedings of the Korean Nuclear Society Conference
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• Proceedings of the Korean Nuclear Society Conference
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• Proceedings of the Korean Nuclear Society Conference
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• Proceedings of the Korean Reliability Society Conference
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• Proceedings of the Korean Nuclear Society Conference
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• 1999.10a
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• 2010

The fracture toughness for the LBB analysis of piping is generally determined by the J-integral according to ASTM E1820. However, since this evaluates a base metal, the fracture toughness for narrow gap welding can be differently than the real value. This study evaluated the plastic  factor of the narrow gap welding part of a nuclear piping with SA508 Cl.1a and SA312 TP316. Also, it performed the fracture toughness test for the narrow gap welding part and applied the new plastic $\eta$ factor equation by Huh, et al. and then compared the results with those according with the ASTM standard.