Both the AP1000 and the APR-1400 are types of pressurised water reactor (PWR). PWRs constitute the large majority of the world's nuclear power plants, but there is currently only one civil PWR in the UK (Sizewell B), with two more under construction (Hinkley Point C). AP1000 Initial plans called for three AP1000 units at Moorside, which is a nuclear power plant designed and sold by Westinghouse. The design has improved use of passive nuclear safety, featuring fewer valves and pumps than previous PWRs and allowing cooling without intervention for up to 72hours, relying mostly on natural processes such as water flowing downhill and heat rising. This novel design has raised a number of concerns but the design has been approved for use in both the United States and China. In December 2011, the Office for Nuclear Regulation (ONR) and Environment Agency (EA) had issued interim design acceptance for the AP1000 reactor design. These indicated that there were 51 outstanding issues and the ONR and EA were satisfied with the plans to resolve these issues. The issues include "Justification of novel form of structure for the steel/concrete composite walls and floors known as CA modules". In 2015, Westinghouse resumed ONR Generic Design Assessment for the AP1000. On 28 March 2017 the ONR issued a Design Acceptance Confirmation for the design, stating that the 51 issues identified in 2011 had received an adequate response. However, the following day the designer, Westinghouse, filed for Chapter 11 bankruptcy in the U.S. because of $9billion of losses from its nuclear reactor construction projects, mostly the construction of four AP1000 reactors in the U.S. APR-1400 In December 2017, it was thought likely that two APR-1400 units will be intended for Moorside. The APR-1400 is designed by the Korea Electric Power Corporation (Kepco). Originally known as the Korean Next Generation Reactor (KNGR), this Generation III reactor was developed from the earlier OPR-1000 design and also incorporates features from the US Combustion Engineering (C-E) System 80+ design. Currently there are two units in operation (Shin Kori unit 3 and 4) and six units under construction, four in the United Arab Emirates at Barakah and two in South Korea(two units at Shin Hanul). Two more units are planned with construction yet to commence at Shin Kori. EPR In July 2020, EDF announced a proposal for two EPR units. Moorside clean energy hub Moorside clean energy hub is a proposal