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==Design== [[File:Модель судна Севморпуть.JPG|thumb|right|Model of ''Sevmorput'']] ===General characteristics=== ''Sevmorput'' is {{convert|260.30|m|ft}} [[length overall|long overall]] and {{convert|236.60|m|ft}} [[length between perpendiculars|between perpendiculars]]. The breadth and depth of her hull are {{convert|32.20|m|ft}} and {{convert|18.30|m|ft}}, respectively.<ref name="rs">{{csr|register=RS|id=840293|shipname=Sevmorput|accessdate=2011-11-26}}</ref> When loaded to the [[load line (vessel)|summer waterline]], the ship draws {{convert|11.80|m|ft}} of water. However, in ice-covered waters she operates with a slightly smaller draught of {{convert|10.65|m|ft}} to improve the icebreaking characteristics of her raked stem.<ref name="rosatom_specs" /> The [[gross tonnage]] of ''Sevmorput'' is 38,226 and [[net tonnage]] 11,468.<ref name="rs" /> The ship's [[deadweight tonnage]] is 33,980 tons at maximum draught and 26,480 tons while operating at reduced draught in ice. Her maximum displacement is 61,880 tons.<ref name="rosatom_specs" /> Although originally designed according to the [[USSR Register of Shipping]] rules of 1981 to the highest Soviet [[ice class]] available for merchant ships, ULA, ''Sevmorput'' is currently classified by the [[Russian Maritime Register of Shipping]] with a slightly lower ice class, UL.<ref name="rs" /> In addition to the national rules she was built according to the latest international regulations and conventions at the time, becoming the first ship built according to the ''Code of Safety for Nuclear Merchant Ships'' adopted by the [[International Maritime Organization]] in 1981.<ref name="rosatom_specs" /><ref name="imo">[http://www.imo.org/about/conventions/listofconventions/pages/international-convention-for-the-safety-of-life-at-sea-(solas),-1974.aspx International Convention for the Safety of Life at Sea (SOLAS), 1974] {{Webarchive|url=https://web.archive.org/web/20150607173502/http://www.imo.org/About/Conventions/listofconventions/pages/international-convention-for-the-safety-of-life-at-sea-(solas),-1974.aspx |date=7 June 2015 }}. International Maritime Organization. {{retrieved | accessdate=2011-11-26}}</ref><ref name="bellona_first">[http://www.bellona.org/english_import_area/international/russia/civilian_nuclear_vessels/icebreakers/30107 Nuclear icebreakers] {{webarchive|url=https://web.archive.org/web/20110413075406/http://www.bellona.org/english_import_area/international/russia/civilian_nuclear_vessels/icebreakers/30107 |date=13 April 2011 }}. Bellona Foundation, 18 June 1997. {{retrieved | accessdate=2011-11-29}}</ref> Special attention was paid to the safety aspects of the vessel and, in addition to running aground or colliding with the reinforced bow of an icebreaker, the Soviet naval architects even took into account the possibility of a passenger aircraft crashing on ''Sevmorput''.<ref name="latimes1989" /> ===Power and propulsion=== ''Sevmorput'' is powered by a single [[KLT-40]] [[nuclear fission reactor]] with a thermal output of 135 megawatts. The reactor core contains {{convert|150.7|kg|lb}} of 30–40- or 90-percent<ref group="note" name="note1">90 % according to information provided to Norwegian government in 1990, 30–40 % according to [[Bellona Foundation]] citing communication with [[Murmansk Shipping Company]]. (Diakov, Anatoli C. et al.)</ref> enriched uranium in uranium-zirconium alloy<ref name="klt40">{{Citation| last1=Diakov| first1=Anatoli C.| last2=Dmitriev| first2=Alexander M.| last3=Kang| first3=Jungmin| last4=Shuvayev| first4=Alexey M.| last5=von Hippel| first5=Frank N.| display-authors=1|year=2006|pages=33–48|title=Feasibility of Converting Russian Icebreaker Reactors from HEU to LEU Fuel|journal=Science and Global Security|volume=14| issue=1|publisher=Taylor & Francis, Inc. |url=http://www.armscontrol.ru/pubs/en/heu-leu-reactors-sgs.pdf|access-date=2011-11-26| doi=10.1080/08929880600620575| bibcode=2006S&GS...14...33D| s2cid=56235901}} </ref> and has reportedly required refueling only twice. The nuclear power plant on board the vessel produces 215 tons of steam per hour at a pressure level of {{convert|40|atm|MPa|abbr=on}} and temperature of {{convert|290|C|F|abbr=on}}. In case of emergency steam can also be produced by a diesel-powered boiler (50 t/h, 2.45 MPa, 360 °C).<ref name="rosatom_specs" /> Unlike the Russian [[Arktika-class icebreaker|''Arktika'']]- and [[Taymyr (1987 icebreaker)|''Taymyr'']]-class nuclear-powered icebreakers, which have three fixed-pitch propellers and utilize nuclear-turbo-electric powertrain, ''Sevmorput'' is propelled by a single 4-bladed [[ducted propeller|ducted]] [[Variable-pitch propeller (marine)|controllable-pitch propeller]] mechanically coupled to a GTZA 684 OM5 [[steam turbine]] which has a maximum output of {{convert|29420|kW|hp|abbr=on}} and turns the {{convert|6.7|m|ft|adj=on}} propeller at 115 rpm. At full power the propulsion system gives the ship a maximum speed of {{convert|20.8|kn}} at a draught of {{convert|10|m|ft}}. She can also maintain a speed of {{convert|2|kn}} in {{convert|1|m|ft|adj=on}} thick level ice.<ref name="rosatom_specs" /> For electricity production ''Sevmorput'' has three 1,700 kW [[turbogenerator]]s and three 2,000 kW standby diesel generators. In addition in case of [[power outage|blackout]] the vessel also has two 200 kW emergency diesel generators.<ref name="rosatom_specs" /> ===Cargo capacity and handling=== {{See also|Lighter aboard ship}} ''Sevmorput'' can carry 74 [[lighter (barge)|lighters]], each with a cargo capacity of 300 tons, in six holds and in two layers on the stern deck. The cargo hold hatches are designed for lighters with a total weight of 450 tons. The lighters are loaded and unloaded with a large [[gantry crane]], manufactured by [[KONE]], with a span of {{convert|21.3|m|ft}} and lifting capacity of 500 tons. The gantry crane has two three-ton auxiliary cranes.<ref name="rosatom_specs" /> When not carrying lighters, ''Sevmorput'' can carry both 20- and 40-foot containers weighing up to 20.3 and 30.5 tons, respectively, in three layers. The total container capacity of the ship is {{TEU|1,328|first=yes}}. While loading and unloading are usually done by shore-based cranes, a small number of containers can be handled with two container attachments to the gantry crane in ports that do not have cranes capable of handling containers. The lifting capacity of the attachments is 38 tons.<ref name="rosatom_specs" /> Later, ''Sevmorput'' has been fitted with two Russian-manufactured 60-tonne hydraulic boom cranes with a lifting radius of {{convert|43|m|ft|-1}}. The new cranes can also be used in tandem to lift 120-tonne loads.<ref>{{cite web|url=http://portnews.ru/news/271580/|title=ЗАО "СММ" поставило грузовые электрогидравлические краны "С1700" для атомного лихтеровоза "Севморпуть"|language=ru|publisher=PortNews|date=31 January 2019|access-date=2 January 2020}}</ref>
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