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The AP1000 design traces its history to two previous designs, the AP600 and the System 80.. The System 80 design was created by Combustion Engineering and featured a two-loop cooling system with a single steam generator paired with two reactor coolant pumps in each loop that makes it simpler and less expensive than systems which pair a single reactor coolant pump with a steam generator in each ...
The pressurized water reactor has several new Generation III reactor evolutionary designs: the AP1000, VVER-1200, ACPR1000+, APR1400, Hualong One, IPWR-900 and EPR. The first AP1000 and EPR reactors were connected to the power grid in China in 2018. [7]
The AP1000 has planned vents at the bottom of the concrete structure surrounding the steel structure under the logic that it would help move air over the steel structure and cool containment in the event of a major accident (in a similar way to how a cooling tower works).
CNNC version emphasizes more passive safety due to influence from Westinghouse AP1000, with increased containment volume and two active safety trains, while CGN version has three active safety trains due to influence from Areva EPR. [13] Some 90% of its components will be made domestically. [14] [15]
In June 2014, China First Heavy Industries completed the first domestically produced AP1000 reactor pressure vessel for the second AP1000 unit. [13] The units were originally projected to begin operation in 2014 and 2015. In April 2015, a start date of 2016 was projected for both. [14] One month later, the start date was put back to 2017.
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Two additional units utilizing Westinghouse AP1000 reactors began preliminary construction in 2009, with Unit 3 being completed in July 2023. [11] [12] Natural-draft type cooling towers were also selected, and the two new cooling towers are nearly 600 ft (180 m) tall. During construction, the units suffered several delays and cost overruns.