Radiation chemistry, radiolysis and pulse radiolysis meet actually a growing interest. In the first part of the present paper, some of the aspects of the radiolysis program of CEA will be presented with reference to the electronuclear applications. The new pulse radiolysis facility and the required specifications of the 10 MeV electron linear accelerator in project will be presented in the second part. key words: radiation chemistry, radiolysis, pulse radiolysis, temperature effects, pressure effects, hea r energy transfer.