In the Work-Package "Users’ Support, Training, Integration and Adaptation", 2 code versions were released by IRSN-GRS to 29 organisations: ASTEC V1.1 in June 04 and V1.2 in July 05. A Users‘ training course and a Users’ club were organized. Discussions between users and the maintenance team were active and fruitful. Some partners prepared specifications of model adaptations to VVER, CANDU, BWR and RBMK. Preliminary links with other SARNET Topics such as recommendations of new models were identified. In the Work-Package "Physical Model Assessment", applications to 20 experiments were performed, covering most physical phenomena (except core reflooding). Integral applications were done on the TMI2 accident and on Phébus FPT experiments. Most results were satisfactory. In the Work-Package "Reactor Application and Benchmarking", benchmarks on 15 different scenarios were performed with integral codes such as MAAP4 and MELCOR or detailed codes. They concerned PWR900, Konvoi 1300, Westinghouse 1000, VVER-440/V213 and VVER-1000 reactors. A close and efficient collaboration took place between “Circles” of users on a same reactor type. Despite a lack of robustness of V1.1, most plant applications reached vessel lower head failure. Some results with coupling of fission product modules were also available. The next stage of work will concern the assessment of the ASTEC V1.2 version that benefits from a first stage of numerical consolidation work.