Abstract
This chapter discusses the application of probabilistic fracture mechanics to develop risk-based criteria that can be used to ensure that adequate margins against reactor pressure vessel (RPV) failure are maintained. Recently, risk related criteria have been used in the USA to assess RPV integrity. Two applications based on the risk criteria defined in the USA are discussed in this chapter, including licensing criteria for maintaining adequate margin against vessel failure during postulated pressurized overcooling events and ASME code guidelines for maintaining adequate margin against vessel failure during normal reactor start-up and shut-down.
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