RG 5.25-74 相关标准章节.docxVIP

Publication Date: 6/1/74  Pages: 7  Date Entered: 2/22/84  Title: DESIGN CONSIDERATIONS FOR MINIMIZING RESIDUAL HOLDUP OF SPECIAL NUCLEAR MATERIAL IN EQUIPMENT FOR WET PROCESS OPERATIONS  June 1974  U.S. ATOMIC ENERGY COMMISSION  REGULATORY GUIDE  DIRECTORATE OF REGULATORY STANDARDS  REGULATORY GUIDE 5.25  DESIGN CONSIDERATIONS FOR MINIMIZING  RESIDUAL HOLDUP OF SPECIAL NUCLEAR MATERIAL  IN EQUIPMENT FOR WET PROCESS OPERATIONS A. INTRODUCTION  Section 70.22 Contents of applications, of 10 CFR Part 70,  Special Nuclear Material, requires, among other things, that each  application for a license to possess at any one time more than one  effective kilogram of special nuclear material (SNM) contain a full  description of the applicants program for control of and accounting for  SNM which will be in his possession under license, including procedures  for controlling SNM during its processing or use in the facility.  Section 70.51, Material balance, inventory, and records requirements,  requires, among other things, that certain licensees conduct their  nuclear material physical inventories in compliance with specific  requirements set forth in 10 CFR Part 70.  The control of and material balance accounting for SNM can be made  more effective by reducing residual holdup in process equipment  following draindown or following draindown and cleanout. This would  lessen the severity of problems associated with determination of the  residual holdup component of a physical inventory and would reduce the  component of uncertainty contributed by residual holdup to a physical  inventory.  This regulatory guide describes design features and  characteristics acceptable to the Regulatory staff for minimizing the  residual holdup of SNM after draindown or cleanout of equipment used in  wet process operations. These features and characteristics are expect