|
(b) The calculated CSI must be rounded up to the first decimal place;
(c) The values of X, Y, and Z used in the CSI equation must be taken from WAC
246-231-200 Table-1 or Table-2, as appropriate;
(d) If Table-2 is used to obtain the value of X, then the values for the terms in the equation for uranium-233 and plutonium must be assumed to be zero; and
(e) Values from Table-1 for X, Y, and Z must be used to determine the CSI if:
(i) Uranium-233 is present in the package;
(ii) The mass of plutonium exceeds one percent of the mass of uranium-235;
(iii) The uranium is of unknown uranium-235 enrichment or greater than 24 weight percent enrichment; or
(iv) Substances having a moderating effectiveness (i.e., an average hydrogen density greater than H2O) (e.g., certain hydrocarbon oils or plastics) are present in any form, except as polyethylene used for packing or wrapping.
Table-1.
Mass Limits for General License Packages Containing Mixed Quantities of Fissile Material or Uranium-235 of Unknown Enrichment per WAC 246-231-094(5)
Fissile material | Fissile material mass mixed with moderating substances having an average hydrogen density less than or equal to H2O (grams) | Fissile material mass mixed with moderating substances having an average hydrogen density greater than H2Oa (grams) |
235U (X) | 60 | 38 |
233U (Y) | 43 | 27 |
239Pu or 241Pu (Z) | 37 | 24 |
a | When mixtures of moderating substances are present, the lower mass limits shall be used if more than 15 percent of the moderating substance has an average hydrogen density greater than H2O. |
Table-2.
Mass Limits for General License Packages Containing Uranium-235 of Known Enrichment per WAC 246-231-094(5)
Uranium enrichment in weight percent of 235U not exceeding | Fissile material mass of 235U (X) (grams) |
| 24 | 60 | |
| 20 | 63 | |
| 15 | 67 | |
| 11 | 72 | |
| 10 | 76 | |
| 9.5 | 78 | |
| 9 | 81 | |
| 8.5 | 82 | |
| 8 | 85 | |
| 7.5 | 88 | |
| 7 | 90 | |
| 6.5 | 93 | |
| 6 | 97 | |
| 5.5 | 102 | |
| 5 | 108 | |
| 4.5 | 114 | |
| 4 | 120 | |
| 3.5 | 132 | |
| 3 | 150 | |
| 2.5 | 180 | |
| 2 | 246 | |
| 1.5 | 408 | |
| 1.35 | 480 | |
| 1 | 1,020 | |
| 0.92 | 1,800 | |
[Statutory Authority: RCW
70A.388.040 and
70A.388.110. WSR 23-21-056, § 246-231-094, filed 10/11/23, effective 11/11/23. Statutory Authority: RCW
70.98.050. WSR 14-09-017, § 246-231-094, filed 4/7/14, effective 5/8/14; WSR 08-09-093, § 246-231-094, filed 4/18/08, effective 5/19/08.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.