To create space for the additional equipment, the torpedo tubes were removed and the original gun armament replaced by two double ZiF-31BS guns. The bridge was widened and a windshield installed, and the mast converted into a tripod mounting antennas for the Lin-M guidance radar, Stvor navigational radar, and Nikhrom identification friend or foe system. Special equipment included a dosimetry unit, chemical control station, automatic toxic substances signaling device, foam extinguishing system, water protection system for flushing substances overboard, and two decontamination stations. Two pumps were installed in the former magazines and winches, cable hangers, compressed air cylinders, and decompression chambers were fitted on the deck and superstructure.
