Unique for Special Requirements

DOE-STD-3007-2007

References, including drawings and operating procedures, may be provided to allow a reviewer the

opportunity to further research the system being evaluated and to verify the accuracy of the descriptive

information provided. References should be specific enough to identify the cited data.

C. UNIQUE OR SPECIAL REQUIREMENTS

This section and its content are optional and may be included to indicate any unique requirements not

normally associated with DOE CSEs. If any specific technical guidance or requirement is especially

pertinent to the process or CSE it may be cited here for emphasis. There is no need to document Rules,

DOE Orders, or ANSI/ANS Standards that are routinely applicable.

D. METHODOLOGY AND VALIDATION

This section of the CSE describes the methodology or methodologies used to establish limits for the

operation being evaluated. Four methods that may be used for the establishment of subcritical limits are:

Reference to national consensus standards that present critical and/or subcritical limits;

Reference to accepted handbooks of critical and/or subcritical limits;

Reference to experiments with appropriate adjustments to ensure subcriticality when the

uncertainties of parameters reported in the experiment documentation are considered; and/or

Use of validated calculational techniques. (Note: One specific example based on validated

calculations that may be used is the Criticality Index (CI) technique useful for setting limits on

commingled arrays of fissile material containers.)

Note that standards and handbooks provide critical data and subcritical limits, which may not include

applied safety margins. The analyst shall4 develop and document margins to be applied to the limits for

the operation being evaluated when using values from referenced standards and handbooks to protect

against uncertainties in process variables and against a limit being accidentally exceeded. When limits

are based on reference documents such as ANSI/ANS-8 Standards, criticality safety handbooks, or

published experimental results, complete and specific references shall2 be cited. The applicability of the

reference data to the operation being evaluated should be discussed.

Calculation methods may include simple hand calculation techniques (e.g., limiting surface density,

density analog), deterministic computer codes (e.g., ANISN or other Sn transport theory codes), and

Monte Carlo computer codes (e.g., MCNP, KENO-V.a). When applicable, nuclear cross-section data