APPLICATION OF THE WIMSD-5A CODE TO REACTORS WITH TUBULAR FUEL

I. Fidziukiewicz1, T. Kulikowska2

1 Osrodek Reaktorow Badawczych, Institute of Atomic Energy, 05-400 Otwock-Swierk, Poland,
2 Institute of Atomic Energy, Zespol A-21, 05-400 Otwock-Swierk, Poland


A new version of the lattice-cell code WIMSD, WIMSD-5A, has been developed on the request of NEA Data Bank in close co-operation with British specialists from AEA Technology, Winfrith.
To this version of the code modifications enabling treatment of tubular fuel elements have been introduced.
In the present paper the applied algorithm of modifications has been described and the errors introduced by the lack of correct approach to tubular elements have been estimated.
Representative results obtained by the old code version and its associate library have been compared to those calculated by the new version of the code and its '86' library.
These comparative results are presented for reactor lattices with M6 and WWR-M2 tubular fuels.