On March 30, 2022, the end loading test, dynamic characteristics detection test and seismic static load test of DN250 helium isolation valve were successfully completed in China Nuclear High Temperature and Pressure Laboratory, marking the complete success of water loop identification test of DN250 helium isolation valve prototype of high temperature gas-cooled reactor.

The nuclear helium isolation valve is a wide range of pressure equipment in the high temperature gas-cooled reactor, which plays an important role in ensuring the normal and stable operation and safety of the high temperature gas-cooled reactor. A large number of nuclear helium isolation valves in the HTR-PM demonstration project are purchased from abroad, which to some extent restricts the subsequent construction of the high temperature gas-cooled reactor.

Ministry of Science and Technology to high temperature gas cooled reactor nuclear grade helium isolation valve research task as a national science and technology major subject, tsinghua university as a project led by units, the nuclear science and technology as the joint unit jointly responsible for the DN100 and DN250 two large diameter nuclear grade 1 helium isolation valve prototype development task, subject goal is to achieve nuclear grade helium and isolation valve series prototype evaluation test, Realize the localization of high temperature gas cooled reactor helium gas isolation valve. Topic in 2019 an approval by the project team, including design, process and manufacturing departments such as solidarity and collaboration, eventually overcame many problems such as technology, processing, according to the project development plan completed two prototype manufacturing, factory test and the evaluation test of DN250 prototype water circuit, for subject has laid a solid foundation. The two prototypes will continue to conduct helium loop identification tests, and all relevant departments will continue to work together to ensure that the project can be successfully completed. Prepare to complete the project appraisal in the second half of the year.

High temperature gas-cooled reactor (HTGR) is the fourth generation of nuclear power technology, which has broad commercial application prospects in the fields of nuclear power generation, cogeneration of heat and power and high temperature process heating. After the successful development of HTGR nuclear helium isolation valve, it will be replaced by the rest of the country, which has good economic and social benefits.