steam is cooled condensed and transferred back to the steam generator via the pumps any energy surplus not used in the propulsion is stored in batteries to provide power for all the electric needs on board as well as for emergencies there are several benefits to using nuclear power for marine propulsion beyond just reducing coNUMBER_TOKEN emissions but before i get to the benefits of that i'd like to talk about another way each one of us as individuals can help reduce our own coNUMBER_TOKEN impact on the environment we all have varying carbon footprints just from living our lives and today's sponsor ren can help you calculate yours by answering a few simple questions and then showing you ways to reduce and offset it you can also sign up for a monthly subscription to fund your choice of different climate projects wren supports a wide range of things like biochar in california that permanently stores carbon and prevents future wildfires or other projects like planting trees in east africa you'll receive monthly updates on the projects that you support see where your money is going right down to photos and details of every tree planted for me i'm currently backing the california fund because i have family and friends that live out in that area and i want to try to help with the wildfire situation what i really like about ren is that it's completely tailored to you the way you live and what your goals are we all have a carbon footprint and ren can help you find ways to reduce that impact by changing banks where you buy your groceries from and by backing impactful projects to learn more about how you can help to end the climate crisis check out the link in the description and the first NUMBER_TOKEN people who sign up will have NUMBER_TOKEN extra trees planted in their name special thanks to ren and to all of you for supporting the channel now back to those nuclear power benefits for shipping first the power density of nuclear reactors is much higher than that of diesel engines so you can travel for a longer period of time even at higher speeds power density is the amount of power generated divided by the weight of the power system higher power density means a more compact power plant that can drive the ship farther for example the u.s navy nuclear-powered nimitz-class aircraft carrier can run for NUMBER_TOKEN years without refueling the military submarines can run for months submerged without refueling in comparison submarines that are powered with diesel use batteries and only run underwater for a few days at low speeds or as little as just a few hours at top speed in addition the higher power to weight ratio allows nuclear ships to seal longer ranges while carrying a heavier load for example compared to its diesel sibling a nuclear-powered aircraft carrier is able to take twice the volume of aircraft fuel NUMBER_TOKEN more weapons and NUMBER_TOKEN NUMBER_TOKEN cubic feet of additional space due to the higher power density within a compact design no space is taken up by fuel storage air intakes and exhaust trunks although nuclear power has a stigma around it from disasters like chernobyl and fukushima nuclear power is still considered a very safe power source over the greater part of a century the u.s navy has run more than NUMBER_TOKEN NUMBER_TOKEN reactor years and sailed more than NUMBER_TOKEN million miles without radioactive leakage or accidents similar to nuclear power plants reactors used for marine propulsion also produce clean renewable energy but they have several differences from land-based nuclear reactors first they're much smaller because in shipping the limitations in volume and weight are higher while a nuclear reactor of a conventional power
START_SPONSOR_TOKEN but before i get to the benefits of that i'd like to talk about another way each one of us as individuals can help reduce our own coNUMBER_TOKEN impact on the environment we all have varying carbon footprints just from living our lives and today's sponsor ren can help you calculate yours by answering a few simple questions and then showing you ways to reduce and offset it you can also sign up for a monthly subscription to fund your choice of different climate projects wren supports a wide range of things like biochar in california that permanently stores carbon and prevents future wildfires or other projects like planting trees in east africa you'll receive monthly updates on the projects that you support see where your money is going right down to photos and details of every tree planted for me i'm currently backing the california fund because i have family and friends that live out in that area and i want to try to help with the wildfire situation what i really like about ren is that it's completely tailored to you the way you live and what your goals are we all have a carbon footprint and ren can help you find ways to reduce that impact by changing banks where you buy your groceries from and by backing impactful projects to learn more about how you can help to end the climate crisis check out the link in the description and the first NUMBER_TOKEN people who sign up will have NUMBER_TOKEN extra trees planted in their name special thanks to ren and to all of you for supporting the channel now back to those nuclear power benefits for shipping END_SPONSOR_TOKEN