Question

how many types of nuclear power plant

Answer 1

Nuclear Power Reactors

(Updated January 2018)

Most nuclear electricity is generated using just two kinds of reactors which were developed in the 1950s and improved since.New designs are coming forward and some are in operation as the first generation reactors come to the end of their operating lifetimes.Over 11% of the world's electricity is produced from nuclear energy, more than from all sources worldwide in 1960.

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Answer 2

Advanced gas-cooled reactor (AGR) These are the second generation of British gas-cooled reactors, using graphite moderator and carbon dioxide as primary coolant. The fuel is uranium oxide pellets, enriched to 2.5-3.5%, in stainless steel tubes. The carbon dioxide circulates through the core, reaching 650°C and then past steam generator tubes outside it, but still inside the concrete and steel pressure vessel (hence 'integral' design). Control rods penetrate the moderator and a secondary shutdown system involves injecting nitrogen to the coolant.

Primitive reactors
The world's oldest known nuclear reactors operated at what is now Oklo in Gabon, West Africa. About 2 billion years ago, at least 16 natural nuclear reactors achieved criticality in a rich deposit of uranium ore (a 17th was in another deposit 30 km away). Each operated intermittently at about 20 kW thermal, the reaction ceasing whenever the water turned to steam so that it ceased to function as moderator. These natural chain reactions, started spontaneously and continued overall for one or two million years before finally dying away.