10 CFR 71.59, Standards for Arrays of Fissile Material Packages

Standards for arrays of fissile material packages

a

(a) A fissile material package must be controlled by either the shipper or the carrier during transport to assure that an array of such packages remains subcritical. To enable this control, the designer of a fissile material package shall derive a number "N" based on all the following conditions being satisfied, assuming packages are stacked together in any arrangement and with close full reflection on all sides of the stack by water:

(1) Five times "N" undamaged packages with nothing between the packages would be subcritical;

(2) Two times "N" damaged packages, if each package were subjected to the tests specified in § 71.73 ("Hypothetical accident conditions") would be subcritical with optimum interspersed hydrogenous moderation; and

(3) The value of "N" cannot be less than 0.5.

b

(b) The CSI must be determined by dividing the number 50 by the value of "N" derived using the procedures specified in paragraph (a) of this section. The value of the CSI may be zero provided that an unlimited number of packages are subcritical, such that the value of "N" is effectively equal to infinity under the procedures specified in paragraph (a) of this section. Any CSI greater than zero must be rounded up to the first decimal place.

c

(1) Less than or equal to 50, that package may be shipped by a carrier in a nonexclusive use conveyance, provided the sum of the CSIs is limited to less than or equal to 50.

(2) Less than or equal to 50, that package may be shipped by a carrier in an exclusive use conveyance, provided the sum of the CSIs is limited to less than or equal to 100.

(3) Greater than 50, that package must be shipped by a carrier in an exclusive use conveyance, provided the sum of the CSIs is limited to less than or equal to 100.

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NRC website 10 CFR 71.59

v t e Code of Federal Regulations
Title 10 Part 71 - PACKAGING AND TRANSPORTATION OF RADIOACTIVE MATERIAL
10 CFR: 1 2 4 5 7 9 10 11 12 13 14 15 16 19 20 21 25 26 30 31 32 33 34 35 36 37 39 40 50 51 52 54 55 60 61 62 63 70 71 72 73 74 75 76 81 95 100 140 150 160 170 171
0, General Provisions, Purpose and scope 1, Communications and records 2, Interpretations 3, Requirement for license 4, Definitions 5, Transportation of licensed material 6, Information collection requirements: OMB approval 7, Completeness and accuracy of information 8, Deliberate misconduct 9, Employee protection 10, Public inspection of application 11, Protection of Safeguards Information 12, Exemptions, Specific exemptions 13, Exemption of physicians 14, Exemption for low-level materials 15, Exemption from classification as fissile material 16, 17, General Licenses, General license: NRC-approved package 18, 19, Previously approved package 21, General license: Use of foreign approved package 22, General license: Fissile material 23, General license: Plutonium-beryllium special form material 24, 25, 31, Application for Package Approval, Contents of application 33, Package description 35, Package evaluation 37, Quality assurance 38, Renewal of a certificate of compliance or quality assurance program approval 39, Requirement for additional information 41, Package Approval Standards, Demonstration of compliance 43, General standards for all packages 45, Lifting and tie-down standards for all packages 47, External radiation standards for all packages 51, Additional requirements for Type B packages 53, 55, General requirements for fissile material packages 57, 59, Standards for arrays of fissile material packages 61, Special requirements for Type B packages containing more than 105A2 63, Special requirement for plutonium shipments 64, Special requirements for plutonium air shipments 65, Additional requirements 71, Package, Special Form, and LSA-III Tests^{<a href="#N_2_7171">2</a>}, Normal conditions of transport 73, Hypothetical accident conditions 74, Accident conditions for air transport of plutonium 75, Qualification of special form radioactive material 77, Qualification of LSA-III Material 81, Operating Controls and Procedures, Applicability of operating controls and procedures 83, Assumptions as to unknown properties 85, Preliminary determinations 87, Routine determinations 88, Air transport of plutonium 89, Opening instructions 91, Records 93, Inspection and tests 95, Reports 97, Advance notification of shipment of irradiated reactor fuel and nuclear waste 99, Violations 100, Criminal penalties 101, Quality Assurance, Quality assurance requirements 103, Quality assurance organization 105, Quality assurance program 107, Package design control 109, Procurement document control 111, Instructions, procedures, and drawings 113, Document control 115, Control of purchased material, equipment, and services 117, Identification and control of materials, parts, and components 119, Control of special processes 121, Internal inspection 123, Test control 125, Control of measuring and test equipment 127, Handling, storage, and shipping control 129, Inspection, test, and operating status 131, Nonconforming materials, parts, or components 133, Corrective action 135, Quality assurance records 137, Audits Appendices: 10 CFR 71 Appendix A

10 CFR 71.59, Standards for Arrays of Fissile Material Packages

a

b

c

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