DESCRIPTION OF THE NRPA BOX MODEL .................................... 77 POSEIDON BOX MODEL DESCRIPTION .......................................... 83 DESCRIPTION OF THE THREETOX MODEL ................................... 87 DESCRIPTION OF THE SELFE/IMMSP/KIOST MODEL.................. 94 DESCRIPTION OF THE UNIVERSITY OF SEVILLE (USEV) 2-D DEPTH AVERAGED MODEL (BALTIC SEA APPLICATION) .................... 101 DESCRIPTION OF THE KAERI: LORAS MODEL ........................... 107 DESCRIPTION OF THE NATIONAL TECHNICAL UNIVERSITY OF ATHENS (NTUA), DISPERSION MODEL ....................................................... 111 DESCRIPTION OF THE SISBAHIA HYDRODYNAMIC AND TRANSPORT MODELLING APPROACH ....................................................... 112 DESCRIPTION OF THE JAEA: SEA-GEARN MODEL ................... 117 DESCRIPTION OF THE UNIVERSITY OF SEVILLE (USEV) 3-D MODEL (PACIFIC OCEAN APPLICATION) .................................................. 121 HYDRODYNAMIC MODELS APPLIED TO THE PACIFIC OCEAN RADIOLOGICAL SCENARIO .......................................................................... 125 CONTRIBUTORS TO DRAFTING AND REVIEW .................................................. 131 LIST OF PARTICIPANTS ........................................................................................... 133