Analysis of Loss of Cooling in Spent Nuclear Fuel Pools
Typ
Examensarbete för masterexamen
Program
Publicerad
2019
Författare
Holm, Simon
Wikman, Tom
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
This master thesis presents an improved estimate of the course of events in the loss
of cooling of the spent fuel pools on Ringhals 3 and 4. Previous analyzes do not take
heat losses from the water in the pools into account, leading to large conservatism,
especially at lower residual heats as evaporation contributes to the removal of a
significant portion of the residual heat. With less conservatism, these results can be
used when doing priorities in catastrophic events that causes a loss of cooling in the
spent fuel pools.
The analysis in this report also shows that evaporation and a decreasing water
level occur before boiling, which in the previous analysis was assumed to occur only
when the water reaches 100 C. This result can be used to avoid erroneous assumptions
about leaking spent fuel pools that could otherwise be assumed as the cause
of a decreasing water level.
In order to obtain these results Comsol Multiphysics has been used. Comsol is
a multiphysics software that uses the finite element method to simulate physics.
A big part of the work has been spent on exploring the possibilities with Comsol,
which was a wish from Ringhals.
Beskrivning
Ämne/nyckelord
Ringhals , loss of cooling , spent fuel pool , evaporation , Comsol Multiphysics