This article needs to be updated.(March 2020)
The HTR-PM (球床模块式高温气冷堆核电站) is a small modular nuclear reactor in China. It is the world’s first high-temperature gas-cooled (HTGR) pebble-bed generation IV reactor and is partly based on the earlier HTR-10 prototype reactor. The reactor unit has a thermal capacity of 250 MW, and two reactors are connected to a single steam turbine to generate 210 MW of electricity.Its role is to replace coal-fired power plants in China's interior, in line with the country's plan to reach carbon neutrality by 2060.
Work on the first demonstration HTR-PM power plant, composed of two reactors driving a single steam turbine, began in December 2012 in Shidao Bay Nuclear Power Plant in Shandong province. The pressure vessels of the two reactors were installed in 2016. The steam generator shell, hot gas duct shell and reactor pressure vessel shell of the first reactor in the HTR-PM demonstration project were successfully paired on 28 April 2020, paving the way for the installation of the main helium fan.  The cold functional tests were successfully completed between October and November 2020. The air and helium mixture was pressurized to a maximum of 8.9 MPa in the primary coolant loop. Following the cold functional tests, the hot tests are being performed in three stages: vacuum dehumidification, heating and dehumidification and the hot functional tests. The hot tests began in December 2020, and would continue before bringing the reactor online. On 12 September 2021, the first of two reactors achieved criticality, becoming the first 4th generation nuclear reactor in the world to do so, and is scheduled to be connected to the electricity grid before the end of 2021.On 11 November 2021, reactor two achieved first criticality. 
Additional safety measures have been recommended for this type of reactor based on experiences with the German AVR reactor. The HTR-PM is expected to be the first generation IV reactor to enter operation.
- Zhang, Zuoyi; Dong, Yujie; Li, Fu; Zhang, Zhengming; Wang, Haitao; Huang, Xiaojin; Li, Hong; Liu, Bing; Wu, Xinxin; Wang, Hong; Diao, Xingzhong; Zhang, Haiquan; Wang, Jinhua (March 2016). "The Shandong Shidao Bay 200 MW e High-Temperature Gas-Cooled Reactor Pebble-Bed Module (HTR-PM) Demonstration Power Plant: An Engineering and Technological Innovation". Engineering. 2 (1): 112–118. doi:10.1016/J.ENG.2016.01.020.
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