Reactor generations:
Commercial reactors such as boiling water reactors, pressurized water reactors or CANDU-type reactors are referred to as ‘second generation’, where ‘first generation’ reactors are those developed in the 1950’s and ‘60’s to equip submarines and aircraft carriers. The 2nd generation is currently giving way to an advanced ‘third generation’ built along lines similar to the pressurized water reactors. Though this transition has not yet been completed, there is an urgent need to transfer to ‘fourth generation’ reactors, which will be more fuel efficient and environmentally friendly, and should be ready for use in the next thirty years.