NEW DECISION METHODOLOGY FOR SELECTING MANUFACTURING CODES OF NUCLEAR REACTOR PRESSURE-VESSELS

摘要

An innovative methodology based on stringency matrixes is proposed in this paper as a decision tool among materials specifications; thus, this selection method helps in the stage of the structural materials selection used in the reactor pressure vessels (RPV) manufacturing. This paper quantifies the stringency of materials requirements by application of a decision deterministic algorithm based on a stringency matrixes system. The methodology has been applied to different standardized materials used in nuclear design, such as SA - 533 Grade B C1.1, SA - 508 C1.3 (specified by American society of mechanical engineers - ASME code), DIN 20MnMoNi55 (as described in KTA rules) and 16MND5 (issued by French nuclear commission, RCC-MR code) specifications. Key scientific publications on the influence of chemical composition on the mechanical behaviour of materials have been considered as an additional element of judgement. The final results show that steel specified by KTA is the best option.