Speaker
Description
Currently the largescale nuclear power system, based on the two-component technology platform has been developed in Russia. The technology implies the buried spent fuel to be safe when its and natural uranium impacts on human health to be equal.
To 2100 fast reactors (FR) and thermal reactors (TR) will consume 541.7 thousand tons of natural uranium, due to the reactors operation 7.523 thousand tons of long-lived radioactive waste (RW) will be produced. With the account of ratio of natural uranium mass to RW mass the equivalence of committed effective doses to the public from the natural uranuim and RW (radiation equivalence) will be achieved after 287 years of the waste disposal, radiation-associated lifetime attributable risks (LAR) will be equal (radiological equivalence) after 99 years of RW disposal.
If two-fold uncertainty in radiation doses assessment occurs, radiological equivalence will be achieved after about 270 years of the waste disposal, however, radiation equivalence will be practically unachievable. If uncertainty in radiation doses assessment is about 30%, radiological and radiation equivalences will be achieved after about 100 and 700 years of the disposal respectively. If RW disposal lasts longer than100-150 years 241Am becomes the dominant contributor to radiation dose and radiation risk. The fraction of all americium radiosotopes in RW mass is 0.23%. If the Am fraction in the waste mass increases by 10 times, radiation equivalence will not be achieved even after 1000 years of the disposal, while radiological equivalence will be achieved after 414 years, that is 315 years more than needed to achieve radiological equivalence for the RW of the original composition, 99 years. So, sepa¬ration of americium from RW will result in reducing of the time to achieve equivalence of effective doses and LARs from depleted fuel and natural uranium. Radiological equivalence principle may be used to justify substantial reduction of the RW disposal duration. If thermal reactors only are used in the nuclear energy system, radiological equivalence may be achieved after more than 20,000 years of RW disposal.
| Country/Int. organization | Russian Federation |
|---|---|
| Speaker's title | Mr |
| Speaker's email address | svm@proryv2020.ru |
| Affiliation/Organization | ”Proryv” Project |
