IAEA-TECDOC-750 Interim guidance for the safe transport of reprocessed uranium INTERNATIONAL ATOMIC ENERGY AGENCY
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Increasingly reprocessed uranium FOREWORD
EDITORIAL NOTE In preparing this document for press, staff of the IAEA have made up the pages from the original manuscript(s).
CONTENTS 1. INTRODUCTION...
APPENDIX
Application 1. INTRODUCTION
TABLE I. THE PHYSICAL PROPERTIES OF REPROCESSED URANIUM Chemical form (molecular formula) Physical state during transport Soluble/ insoluble Fractional uranium content (w/w) Uranium trioxide U0 3 solid moderately soluble U/U0 3 0,832 Uranyl nitrate U0 2 (N0 3 ) 2 solid/liquid soluble U/UO 2 (NO 3 ) 2.nH 2 O 0.474 a Uranium tetra-fluoride solid moderately soluble U/UF 4 0.758 UF 4 Uranium hexafluoride solid soluble U/UF 6 0.676 UF 6 Uranyl fluoride U0 2 F 2 solid soluble U/U0 2 F 2 0.773 Uranium dioxide UO 2 solid insoluble U/UO 2 0.881 Tri-uranium octoxide U 3 0 8 solid insoluble U/U 3 O 8 0.848 a Generally, the water of crystallization in the solid is n = 6, and so the uranium content is 0.474 in that form.
3. DEFINITION OF UNIRRADIATED URANIUM
4.2.2. Reprocessed uranium classified as LSA-II LSA-II is defined as follows in the current Regulations: "131. Low specific activity (LSA) material shall mean radioactive material which by
surrounding
transport
is primarily because
Package inspection to the requirements specified in para. 402 of the Regulations should
5. SUMMARY The consultants services meetings have examined the transport of reprocessed uranium
(b) When 10 mg of reprocessed uranium material contains in radioactivity less than
Appendix
Appendix II NUCLIDES COMPOSING REPROCESSED URANIUM Uranium compounds such as UF
to TABLE IV. CHARACTERISTICS OF REPROCESSED URANIUM PACKAGE Enriched uranium of natural source Enrichment A 2 (Bq) Item U 5% Unlimited Quantity equivalent of A 2 (kg) Activity (Bq/g) Activity limit of LSA-II (10%/B) Activity limit of LSA-III (2 X 10' 3 A 2 /g) Unlimited
Appendix in IAEA REGULATIONS CONCERNING REPROCESSED URANIUM This appendix summarizes those standards specified
Appendix
(2) UK proposal: Pu, FP, 236 U Whilst chemical purification techniques
Attachment
PROBLEMS Attachment 2 to Appendix IV
lower specific activity than
Appendix V REPROCESSED URANIUM CLASSIFIED AS LSA-II Reprocessed uranium can be classified as LSA-II in the following cases:
"AI.4.3.
TABLE
Appendix
(U) Samples U0 2, U 3 0 8 powder U(%), O/U 3, F(ppm),
TABLE VIII. LEACHING TEST RESULTS
Attachment
Attachment
TREATMENT Appendix VII
requires further regulation under LSA-III
Appendix VIII A 2 OF MIXTURE TABLE IX. EXAMPLE OF CALCULATING A 2 VALUE (MIXTURE) 3 Uranium isotopes Content ratio of reprocessed uranium az U 234 u 235JJ 236 U Z38JJ Z28 Th
A Appendix IX
ê TABLE X. THE RELATION BETWEEN URANIUM ENRICHMENT AND A 2 VALUES Uranium isotopes A 2 (i) [Bq] 232 U 3 x 10 s 228 Th< 234 U 235 U 236 U 238 U "Tc Total A 2 value Remarks
TABLE
Appendix
TABLE XIII. EXTENT OF CONTRIBUTION OF RADIOACTIVE IMPURITIES AS A WHOLE TO THE VALUE OF A 2 (TEST CALCULATION WITH ENRICHED REPROCESSED URANIUM) (a) All nuclides taken into account Nuicl ides a o^
(b) Only representative nucl ides evaluated
DAUGHTER NUCLIDES Appendix XI
TABLE
Appendix XII CLASSIFICATION OF AN EMPTY CYLINDER CONTAINING UF
Since the specific activity under 1 is greater than that under 2 the transported item does not satisfy the standard for LSA-II. Alternatively, to qualify for a Type A transport, the total activity must
INVESTIGATIONS Annex
Abstract The
2. MODELLING FOR APPLYING THE ISOSHLD-PROGRAMME
FIG.
TABLE
1000 f 100 As
10000 1000 100 1 year 4 years 10.23 years 16 years FIG.
O) u crö 20 nsv/h SO 50 25 lisv/h distance
Öl o crö +-> i/l "O FIG. 13. Vector l, container drained, time: 1 year. FIG. 14. Vector 2, container drained, time: 10.23 years. 69
FIG.
10000 vector! vector 2 vector 3 vector 4 FIG.
10000 vector 1 vector 2 vectors vector 4 FIG. 19. Comparison of surface dose rates of the drained container after 10.23 years. 72
REFERENCES [1] INTERNATIONAL ATOMIC ENERGY AGENCY, Regulations for the Safe Transport of Radioactive Material, Safety Series No. 6, 1985 Edition (As Amended 1990), IAEA, Vienna (1990). [2] INTERNATIONAL ATOMIC ENERGY AGENCY, Explanatory Material for the IAEA Regulations for the Safe Transport of Radioactive Material (1985 Edition), Second Edition (As Amended 1990), Safety Series No. 7, IAEA, Vienna (1990).
CONTRIBUTORS TO DRAFTING AND REVIEW Consultants Services Meeting, Vienna,