Content Guidance for Criticality Safety

DOE-STD-3007-2007

II. CONTENT GUIDANCE FOR CRITICALITY SAFETY EVALUATIONS

The CSE shall1* establish the fact that any proposed fissionable material system or process will remain

subcritical under normal and credible abnormal conditions. This shall2 be done by considering the

amounts and types of fissionable material used in the system or process, establishing controlled

parameters that affect criticality safety, and setting limits on those parameters. The CSE shall3 contain

sufficient detail, clarity, and lack of ambiguity to allow a peer reviewer familiar with the facility and

processes to independently assess the adequacy and accuracy of the CSE.

This section contains guidance for the format and content of CSEs intended for establishing the

subcriticality of fissionable material handling, processing, and storage operations in compliance with

ANSI/ANS-8.1-1998 and supporting ANSI/ANS-8 Standards. The purpose in performing the type of

CSE described in this section is to analyze the criticality hazard associated with a fissionable material

process or system and develop limits and controls to prevent a criticality accident. Content guidance for

the CSE is provided below, arranged by specific topics and section headings. If any heading or content

discussed below is optional, it will be so indicated. The addition of sections and content not discussed

herein that are deemed important by the analyst may be included in the CSE.

A. INTRODUCTION

The purpose and scope of the evaluation should be stated in this section. Relevant background

information should also be presented here. If the evaluation represents a modification or revision to an

existing evaluation or system then the reason for the change should be clearly stated.

B. DESCRIPTION

The system or process is described in this section of the CSE. Illustrations and/or graphics may be

provided as needed to provide clarity. Assumptions about the process and scope limitations that impact

the CSE should be stated and justified. Assumptions that apply only to computer modeling should not

be included here but should be presented in Section D below. If the evaluation covers a specific portion

of a system or process or is limited to a particular aspect of a system or process, the potential for

interaction with other aspects or systems should be described as well as references to any related CSEs.

*See Endnotes