Thermosiphon Assembly for the Cold Neutron Source

Year of manufacture: 2022

Customer: NPP MashTEK

 

The thermosiphon assembly shall be put inside the reactor channel in the cold neutron source (CNS) of the PIK reactor (the NRC “Kurchatov Institute” – PNPI).

The CNS chamber is a unique, complicated product. Its single copy has been first developed for this specific cold neutron source.

The CNS chamber is the most loaded part of the thermosiphon assembly. It bears the extremely low temperatures and high radiation for a long time. The CNS chamber has the potentially explosive deuterium under excess pressure inside. The CNS chamber shall comply with the strict requirements for leak tightness.

This is a double-wall chamber. Each wall has a liquid deuterium inside which flows through the gap between the walls. The helium gas cools the liquid deuterium up to 20 K. The CNS chamber design considers the best efforts to minimize the chamber weight. Its walls have the minimum thickness, ensuring the required strength and resistance.

The Sosny R&D Company developed specific welding procedures to manufacture the CNS chamber at its plant. These procedures were certified by the Eurasian Welding Certification Association that is an international voluntary certification system. One welder got the certificate of conformity from the Eurasian Welding Certification Society authorizing him to weld the aluminum alloys.

 

 

 

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