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.
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.