The amount and temporal behaviour of the fuel release from the JET walls has been analysed for normal and disruptive shots during the JET SRP divertor campaign (2002-2004 with about 8000 plasma shots). The averaged fuel release in the first 700sec after the shots for non disruptive shots is 1.8¥1022 atoms compared with an averaged value of 3.7¥1022 for the disruptive shots. A clear and approximately linear increase of the released particles with the plasma stored energy at the time of disruption is found. Non disruptive and disruptive shots can be clearly separated from the temporal evolution of the fuel release showing a slow particle release after non disruptive and an instantaneous release after disruptive shots indicating thermally induced particle desorption after disruptions. Preprint of Paper to be submitted for publication in Proceedings of the 18th Plasma Surface Interactions in Controlled Fusion Devices Toledo, Spain ( 26th May 2008 - 30th May 2008)