ASME NTB-4 pdf download Background Information for Addressing Adequacy or Optimization of ASME BPVC Section III, Division 5 Rules for Nonmetallic Core Components INTRODUCTION Before its appearance in the 201l edition of ASME BPVC, there was no internationally recognized graphitecore design code. Although the need for such a code was recognized by stakeholders such as the US NuclearRegulatory Commission (NRC)...