JRC participated in the OECD/NEA FASTRUN benchmark reviewing fast-running software too
ls to mode
l fission product re
leases during accidents at nuc
lear power p
lants. The main goa
l of fast-running software too
ls is to foresee the accident progression, so that mitigating actions can be taken and the popu
lation can be adequate
ly protected. Within the FASTRUN, JRC used the
MAAP 4.0.8 code and deve
loped a methodo
logy to obtain the source term (as activity re
leased per radioisotope) of PWR and BWR station b
lack-out accident scenarios. The modifications made in the MAAP mode
ls were
limited to a minimum number of important parameters. This aims at reproducing a crisis situation with a
limited time to adapt a generic input deck.
This paper presents further studies, where JRC analysed the FASTRUN BWR scenario using MAAP 5.0.2 that has the capability of calculating doses. A sensitivity study was performed with the MAAP 5.0.2 DOSE package deactivated, using the same methodology as in the case of MAAP 4.0.8 for source term calculation. The results were close to the reference LTSBO SOARCA case, independently of the methodology used. One of the benefits of using the MAAP code is the short runtime of the simulations.