SwissNuclear project: Investigation of fuel assembly integrity under wet and dry storage
A comparison with calculations by the validated models used in MELCOR 1.8.6 will show advantages and limitations of the new model if compared also with experimental data. Using the expected decay heat data for BWR and PWR spent fuel elements, it is possible to determine the minimum storage times for wet storage before dry storage can be applied, also considering the planned shut-down of nuclear power plants when the safety procedures may differ from those under power operation.
The PSI air oxidation model can be compared with the Sandia model for air oxidation and breakaway of the oxide layer in case of severe accident conditions. The data from a recently performed project investigating the influence of nitrogen on the acceleration of the oxidation process of Zircaloy cladding materials can be used to validate the calculated results.