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RWMAC's Advice to Ministers on the Radioactive Waste Implications of Reprocessing
ANNEX 7
INDICATIVE DISCHARGES AND DOSES FROM REPRESENTATIVE REPROCESSING THROUGHPUTS
Figures are given below for Magnox and THORP reprocessing. The Magnox figures are based on:
- 1200 tHM Magnox (burn up range 1500 7300 MWd/tHM; cooling from 20010,000 days);
- 1020 tHM THORP, cooling time from 5 30 years consisting approximately 25 per cent AGR (burn up 10,000 to 40,000 MWd/tHM and 75 per cent LWR (burn up from 15,500 to 55,000 MWd/tHM).
Proportion of UK versus overseas fuel reprocessed through THORP averaged over period up to 2008/9 is approximately 9:11.
Note that 1TBq = 1012 Bq
(a) liquid discharges
| Radionuclide | Activity (TBq/yr) | Critical group dose (microSv/yr) | Collective dose (World 500 years) (manSv) | ||||||
| Magnox | THORP | Other | Magnox | THORP | Other | Magnox | THORP | Other | |
| H-3 | 1770 | 8420 | 411 | - | - | - | - | - | - |
| C-14 | 7 | 1 | 8 | 2 | - | 2 | 89 | 8 | 92 |
| Co-60 | - | 2 | 2 | - | 2 | 2 | - | - | - |
| Sr-90 | 31 | - | 5 | 3 | - | 1 | - | - | - |
| Zr/Nb-95 | 1 | - | 1 | - | - | - | - | - | - |
| Tc-99 | 63 | - | - | 13 | - | - | - | - | - |
| Ru-106 | 22 | 1 | 3 | 11 | 1 | 2 | - | - | - |
| I-129 | - | 1 | - | - | - | - | - | - | - |
| Cs-134 | - | - | 1 | - | - | - | - | - | - |
| Cs-137 | 6 | 2 | 9 | 2 | 1 | 3 | - | - | - |
| Ce-144 | 1 | - | 1 | - | - | - | - | - | - |
| Pu-241 | 1 | 1 | 4 | - | - | - | - | - | - |
| Am-241 | - | - | - | - | - | - | - | - | - |
| Pu-alpha | - | - | - | - | - | 1 | - | - | - |
| Total | 1902 | 8429 | 444 | 32 | 5 | 11 | 90 | 9 | 93 |
(b) aerial discharges
| Radionuclide | Activity (TBq/yr) | Critical group dose (microSv/yr) | Collective dose (World 500 years) (manSv) | ||||||
| Magnox | THORP | Other | Magnox | THORP | Other | Magnox | THORP | Other | |
| H-3 | 515 | 33 | 5 | 4 | - | - | 1 | - | - |
| C-14 | - | - | 2 | - | 2 | 20 | 2 | 8 | 37 |
| S-35 | - | - | - | - | - | 5 | - | - | - |
| Ar-41 | - | - | 2780 | - | - | 12 | - | - | - |
| Co-60 | - | - | - | - | - | - | - | - | - |
| Kr-85 | 53800 | 249000 | - | 1 | 3 | - | 15 | 70 | - |
| Sr-90 | - | - | - | - | - | - | - | - | - |
| Ru-106 | - | - | - | - | - | - | - | - | - |
| Sb-125 | - | - | - | - | - | - | - | - | - |
| I-129 | - | - | - | 1 | 18 | 11 | 2 | 9 | 4 |
| I-131 | - | - | - | - | - | - | - | - | - |
| Cs-137 | - | - | - | - | - | - | - | - | - |
| Pu-241 | - | - | - | - | - | - | - | - | - |
| Am-241/Cm-242 | - | - | - | - | - | - | - | - | - |
| Pu-alpha | - | - | - | - | - | - | - | - | - |
| Total | 54315 | 249033 | 2787 | 6 | 23 | 49 | 20 | 87 | 42 |
Note that breakdown of discharges (and hence doses) between Magnox, THORP and others is not precise.