American National Standard
American National Standard

Author: American Nuclear Society. Standards Committee Working Group ANS-8.15

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This standard is applicable to operations with the following nuclides: 232U, 234U, 237Np, 236Pu, 238Pu, 241Pu, 242Pu, 241Am, 242Am, 243Am, 242Cm, 243Cm, 244Cm, 245Cm, 246Cm, 247Cm, 249Cf, and 251Cf. Subcritical mass limits are presented for isolated units. The limts are not applicable to interacting units.

American National Standard ANSI
American National Standard ANSI

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Published: 1996

Total Pages: 5

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The American National Standard, 'Nuclear Criticality Safety in Operations with Fissionable Materials Outside Reactors' ANSI/ANS-8.1- 1983 provides guidance for the nuclides [sup 233]U, [sup 235]U, and [sup 239]Pu These three nuclides are of primary interest in out-of-reactor criticality safety since they are the most commonly encountered in the vast majority of operations. However, some operations can involve nuclides other than 'U, 'U, and 'Pu in sufficient quantities that their effect on criticality safety could be of concern. The American National Standard, 'Nuclear Criticality Control of Special Actinide Elements' ANSI/ANS-8.'15-1983 (Ref 2), provides guidance for fifteen such nuclides.

American National Standard
American National Standard

Author: American Nuclear Society. Standards Committee Working Group ANS-8.7

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ANS 8.7-1998 (R2017) is applicable to the storage of fissile materials. Mass and spacing limits are tabulated for uranium containing greater than 30 wt-% 235U, for 233U, and for plutonium, as metals and oxides. Criteria for the range of application of these limits are provided.