A small number of fission products
also have very long half-lives, notably technetium-99 (212,000 years) and iodine-129 (16 million years.) Some repository risk studies suggest that these isotopes would contribute more than most actinides to the radiation dose that could be received by the repository's neighbors in the far future.
The first advantage is in terms of fission product
retention within fuel pellets.
This cycle is potentially much cheaper than conventional Pu separation and recycle into LWRs, since relatively simple steps can be used to remove only the fission products
from the spent fuel.
A hypothetical uncontrolled LOCA has been considered to study the effect of the spray system on airborne fission product
masses inside the containment building.
Its graphite burned for ten days, pouring fission products
directly into the stratosphere.
Because the intact SG does not have fission product
in the SGTR accident, it is no problem that the steam of the intact SG is released to the environment.
Watanabe, "Development of THALES-2, a computer code for coupled thermal-hydraulics and fission product
transport analyes for severe accident at LWRs and its application to analysis of fission product
revaporization phenomena," British Journal of Cancer, vol.
The measured signal is strongly related to the chamber characteristics such as gas pressure and pulses' charge which varies according to the creation charge induced by fission product
. The pulse charge's spectrum characteristics inform us about the FC specifications and their evolution over time.
Thomas Fink, General Manager Nuclear Safety Division of SCHOTT, commented: In the event of a severe accident, the most important area of concern is maintenance of the fission product
barrier - effectively maintaining the barrier between the radioactive fuel inside the containment and the outside environment.
About 100 mt per year of fission product
wastes go to a geological repository, it says.
as well as activation and fission products
, and medical isotopes.
The paper "A Conceptual Approach to Eliminate Bypass Release of Fission Products
by In-Containment Relief Valve under SGTR Accident" presents the conceptual design of the ICRV (In-Containment Relief Valve) as effective means to mitigate the release to the environment of fission products
from the SGTR (Steam Generator Tube Rupture) accident.