Augmented scope of the 1974 ASME Section X1 code 'In-service inspection of nuclear power plant components'

The major revisions and additions to ASME code Section X1 introduced since 1971 and incorporated into the 1974 Code are described. The specific changes include: functional testing of pumps and valves; expansion to cover components in ASME Code classes 2 and 3; ultrasonic examination procedures (Appendix I); standards for examination evaluation; evaluation of flaw indications (Appendix A) and repair procedures. A major addition is the establishment of acceptance - rejection levels four levels of acceptance standards being developed. Future additions include inspection of reactor core internals and component supports for LWRs, inspection of gas cooled and liquid metal cooled plants. (U.K.)