I have a question regarding use and application of ANSI standards. If the components, systems of structures are classified in accordance with ANSI/ANS 18.2 1973 »Nuclear Safety Criteria For The Design Of Stationary PWRs«, and this standard is referenced in USAR, are you allowed to use ANSI/ANS 58.14 »Safety and Pressure Integrity Classification Criteria for Light Water Reactors«. Are you allowed to declassify some parts of systems for minor modifications? ANSI/ANS 58.14 is currently not referenced in USAR. My second question is, what is the correlation between ANSI/ANS 18.2 and ANSI/ANS 51.1 »Nuclear Safety Criteria for the Design of Stationary Pressurized Water Reactor Plants«? In foreword of ANSI/ANS 51.1 is stated that is complete revision of ANSI/ANS 18.2. In this case are you allowed to apply this standard instead of ANSI/ANS 18.2, which is referenced in USAR.
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