Why pump it into oceans? Presmably the heat cannot be retrived to be used later? So instead why not heat homes / other buildings instead of wasting it?
It's mainly a summer thing - Britain is comfortable in summer but cold in winter, electricity demand drops in the summer time, which leaves constant load nuclear producing electric few people want, as they don't have their heating turned on.
A district heating system wouldn't really make use of much of the excess hot water when electric demand is low, and in any case, Britain doesn't build nuclear power stations next to large cities as a matter of policy, post Windscale.
It would be better to do something meaningful with the heat - continue to generate electric and create hydrogen with it, which can be generated, compressed and stored a short but safe distance away from the nuclear power station. Liquid hydrogen is easier to generate when steam rather than water is used, so the steam from the nuclear power station could be used as the water source in a hydrogen electrolysis plant.
That liquid hydrogen can either be used as a vehicle fuel, if fuel cell vehicles break into the main stream, or stored over the low peak periods and off-peak periods, and used in a hydrogen power station as peak and additional winter load.
I do like the idea of an IPEMU using a hydrogen fuel cell. It would be a good solution for WHL, FNL etc.
