Evaluation and Results - s3007cn10016

DOE-STD-3007-93

[Note: Examples of each method are given in Section IV of this document.]

Contingency analysis, in general, is not required for incredible upset conditions.

Some systems will remain subcritical during any combination of credible upset conditions. For

such systems, simply state the fact in this section. (e.g., "As shown in Section 6.0, this system

will remain subcritical under any combination of credible upset conditions.")

6.0 EVALUATION & RESULTS

After the establishment of appropriate and sufficient subcritical limits (see Section 4.0), it must be

shown that both the normal and worst-case postulated upset conditions (may be limited to

credible conditions only) will be equal to or less than those values. If the actual conditions differ

from those used to establish the subcritical limits, it must be shown that the comparison is

conservative.

If calculational techniques are used, a detailed description of the models should be presented in

this section. The level of detail should be sufficient to allow an independent reviewer to easily

reconstruct the computational model, compare the model with the descriptive information in

Section 2.0, and determine if the overall model is conservative. Sketches showing relevant model

dimensions should be included. (Very simple modeling that can clearly be described in a few

sentences is an exception.) Significant assumptions and simplifications should be stated. Mesh

spacing, quadrature order, the order of the Legendre scattering expansion, and other parameters

pertinent to numerical techniques should be specified or incorporated by reference.

All material compositions used in the evaluation should be specified in Appendix A. Typical input

listings should be given in Appendix B. Any of this information may be incorporated into the text

or by reference.

All calculational results should be reported in this section. Estimated uncertainties in the

methodology (e.g., statistical uncertainties associated with Monte Carlo calculations) and

sensitivities to modeling simplifications (e.g., effects of homogenization, dimension or geometry

modifications, etc.) should be stated.

7.0

DESIGN FEATURES (PASSIVE & ACTIVE) AND

ADMINISTRATIVELY CONTROLLED LIMITS &

REQUIREMENTS

Design features (passive and active) and administratively controlled limits and requirements for

the purpose of preventing or reducing the probability of a criticality accident should be stated in

this section or should be incorporated by reference.