This document provides a description and justification for the measurement methods used to determine fissile mass for Waste Disposal/Groundwater Remediation Project (WD/GRP) limited control facility operations that will satisfy the requirements of the Fluor Hanford Criticality Safety Program. For many facilities and fissile containers, the uncertainty cannot be quantified, and the fissile mass is not known with precision. There is reasonable confidence that conservatism was applied in the past to assure that the fissile mass limits were met. To validate this, comparisons will be made at least annually to see how well the new nondestructive assay (NDA) values compare with the old. Fissile mass uncertainty will continue to be considered in the waste acceptance process and during facility operations. Significant anomalies with fissile mass identified through NDA will be investigated to evaluate whether other actions are needed. These commitments and the specific processes that accomplish them will be implemented in facility and project administrative procedures. This methodology will be reviewed at least every two years and updated as needed.
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