 Kirov was completely overhauled from 1949 to 1953 . Her secondary armament was upgraded with electrically powered , fully automated 100 mm B @-@ 34USM mountings and her fire @-@ control system was replaced with a Zenit @-@ 26 system with SPN @-@ 500 stabilized directors . All of her light AA guns were replaced with nine twin gun water @-@ cooled 37 mm V @-@ 11 mounts . All of her radars were replaced with Soviet systems : Rif surface search , Gyuys air search , Zalp surface gunnery and Yakor ' anti @-@ aircraft gunnery radars . All anti @-@ submarine weapons , torpedo launchers , aircraft equipment and boat cranes were removed . While expensive , about half the cost of a new Project 68bis Sverdlov @-@ class cruiser , it was deemed a success and allowed Kirov to serve for another two decades . 
