CASTRO, A.J.A. deUMBEHAUN, P.E.CARVALHO, M.R.2018-03-192018-03-19CASTRO, A.J.A. de; UMBEHAUN, P.E.; CARVALHO, M.R. Comissioning of the IEA-R1 nuclear reactor new heat exchanger. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. <b>Abstract...</b> São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 57-57. Disponível em: http://repositorio.ipen.br/handle/123456789/28754.http://repositorio.ipen.br/handle/123456789/28754This work presents results on the commissioning of the new heat exchanger of the IEA-R1 nuclear reactor in the occasion of its operational power upgrade from 2 MW to 5 MW, in comparison to the values calculated in the project of IESA Design and Equipments Company. This reactor is a swimming pool type, light water moderated and with graphite reflectors, used for research purposes and medical radioisotopes production. During monitoring procedures, issues were observed on the reactor operation at 5 MW mainly due to the ageing of the reactor’s oldest heat exchanger (TC-A) and excessive vibrations at high flow rates on the other installed heat exchanger (TC-B). So it was decided to provide a new IESA heat exchanger with 5 MW capacity to definitely substitute the TC-A heat exchanger. The results show that the IEA-R1 nuclear reactor can be operated safely and continuously at 5 MW with the new IESA heat exchanger.57-57openAccessResumo de eventos científicoshttps://orcid.org/0000-0002-2887-0759