Hello John
There is asite at Jumieges I have used before called La foret but you must book in advance as when I turned up without booking, they had no space.
Thery did however direct me to a site near by call La Losirs At Le Mesnil-sous Jumieges.
When we arrived the guy at reception spoke excellent english, gave us a good pitch,next to the toilet block, easy to get on /off, 21euros a night inc elect, water and drainage but the site had two main disadvantages one being the toilet block it was not very clean not the sites fault but the people using it, there were a lot of french youth using it who were very noisy until about 12.30am
Hope this helps
Alb