The present invention relates to a full-type reactor cooled with a reactor, especially a liquid metal (such as a heavy metal such as a lead or lead-bismuth process alloy), sodium, or molten salt. The reactor comprises a core (4) formed by a plurality of fuel elements (12) and immersed in a primary fluid (F) circulating between the core and the at least one heat exchanger (10). The fuel element 12 extends along each parallel longitudinal axis A and is provided with a respective lowermost active portion 13 which is immersed in the primary fluid to constitute the core and a lowermost active portion 13 extending from the uppermost portion from the active portion, And each of the service units protruding. The fuel element 12 is mechanically supported through each top end head 32 fixed to the support structure 120 and can be operated through a handling device.
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