[elektro-etc] kornyezetvedelem .

[charles hoss]

http://www.gizmag.com/nuclear-icebreakers-double-acting-ships-azipods/20903/?utm_source=Gizmag+Subscribers&utm_campaign=1c2de13ace-UA-2235360-4&utm_medium=email

Nuclear Power - the only practical choice for Arctic icebreakers

In order to constantly provide enough power to shove that bulk up over
mile after mile of ice, the 50 Let Pobedy (let's just call it the
Victory) runs a pair of nuclear reactors that generate a combined 55.2
megawatts (74,000 horsepower), which hits the water through three
electric propulsion motors.

Why nuclear? Well, to put it simply, the fuel demands of the task at
hand would be outrageous using any other power source. Burning diesel,
the Victory would use more than 100 tons (90.7 metric tons) of fuel a
day, and have a severely restricted range as a result. But running on
nuclear power, she burns less than half a kilo (1 pound) of uranium
even on the toughest day, at constant full power across 2.8-meter
(9.2-foot) thick ice.

With nuclear reactors on board, fuel stops become almost a thing of
the past - a handy feature considering they work in extremely remote
areas and have no other compelling reason to come in to port. In fact,
the world record for endurance is held by one of Victory's older
cousins, the Arktika, which stayed in service on the ice for 357 days
without entering a port once.

In fact, the specific needs of icebreaking vessels make them one of
the only cases where nuclear propulsion is economically practical -
barring nuclear submarines, which take advantage of the fact that the
reactors don't require oxygen to run. Nuclear reactors are more
expensive to build than combustion engines, and enriched uranium
doesn't come cheap - but at the end of the day, by virtue of sheer
volume, the fuel costs end up being much, much lower than an
equivalent diesel engine.

No, the main issue is insurance. Imagine trying to insure one of these
things, given the catastrophic and lasting damage that could occur in
the "unlikely event" of an accident. Luckily, so far, there has not
been a major incident.

http://www.gizmag.com/shipping-pollution/11526/

a ket cikk elolvasasa utan meg mindig ugy erzem hogy nagyon-nagyon
nyugisan toltjuk az idot ahelyett hogy fejlesztenenk , haladnank -
tennenk a kornyezetvedelemert ahelyett hogy elszenvedjuk a hianyanak
hatasait .

bye
dexter