CFR > Title 10 - Energy > CHAPTER I—NUCLEAR REGULATORY COMMISSION > PART 71—PACKAGING AND TRANSPORTATION OF RADIOACTIVE MATERIAL > SUBPART G—Operating Controls and Procedures (§71.81 to §71.100) > 71.83—Assumptions as to unknown properties.

71.83—Assumptions as to unknown properties.

When the isotopic abundance, mass, concentration, degree of irradiation, degree of moderation, or other pertinent property of fissile material in any package is not known, the licensee shall package the fissile material as if the unknown properties have credible values that will cause the maximum neutron multiplication.