Ice Passport For Icebreaker "Pierre Radisson" And Passport's Concept: Further Development

A Maritime administration of any country, shipowner, navigator are interested in navigation safety. The problem of maintaining safe navigation becomes especially important while sailing in ice condition. The most general indicator of safety of ship operation in certain ice condition is ice class (ice category) under some Classification Society. The disadvantage of ice classes is the absence of recommendations for ship control in certain ice condition or certain region of a freezing sea. Early in the 60-th the Russia began to grow the cargo transportation along Northern Sea Route. The increasing cargo transportation led to a growing amount of damages of hull structures and rudder-propeller equipment. The increasing of hull structures damage amount in describing period is a main reason of development of a mean for regulation of ship motion regimes in certain ice condition. The Ice Passport (IP) is the approach used in Russia. Since 1973 17 ice passport were developed for various types of ships which are used for transport operation in Arctic seas. The main orders of ice passports are Murmansk Shipping Company (from Murmansk), North Shipping Company (from Arkhangelsk). The Department of Ship Performance of AARI on the order of Transport Canada and Canadian Coast Guard under management of NRC-Canadian Hydraulics Centre developed the IP for Canadian Coast Guard icebreaker "Pierre Radisson", and described the methodology of IP developing. This paper contains the description of IP-general concept; main stages of IP developing illustrated by results for icebreaker "Pierre Radisson": attainable speeds diagrams, safe and dangerous speeds diagrams. The paper contains also the suggestion for improving of IP.