RDS-202 was assembled on the principle of radiation implosion, which was previously tested during the creation of RDS-37. Since it used a much heavier secondary module than in the RDS-37, then not one, but two primary modules (charges), located on two opposite sides of the secondary module, were used to compress it. This physical charging scheme was later used in the design of the AN-602, but the AN-602 thermonuclear charge itself (secondary module) was new. The RDS-202 thermonuclear charge was manufactured in 1956, was planned for testing in 1957, but was not tested in 1957, and was put into storage in the same year. Two years after the manufacture of the RDS-202, in July 1958, it was decided to remove it from storage, dismantle and use automation units and charge parts for experimental work (Order No. 277 of the Ministry of Medium Machine Building dated May 23, 1957).[http://elib.biblioatom.ru/text/kiryushkin_kuzkina-mat_2015/go,55/