# CANDU Reactor contains 70 kf og fissionable material

• JohnTralp
In summary, the "CANDU Reactor contains 70 kf og fissionable material" refers to a Canadian nuclear reactor that uses natural uranium as fuel and is capable of producing 70,000 megawatt-days per tonne of energy. It uses nuclear fission to generate heat, which is then used to produce electricity. 70 kf of fissionable material is a significant amount of energy, with 1 kg of uranium-235 being able to power a household for over 2,000 years. The CANDU Reactor differs from other nuclear reactors in its use of heavy water, allowing it to use natural uranium and making it a cost-effective option. It is also considered to be safe, with numerous safety features

## Homework Equations

Working at a rate of 1.204 x 10^22 fissions/s, what fraction of that 70 kg mass of Uranium will be fissioned during the 550 days of fuel installation? (Fuel rods are replaced appx. every year and a half)

## The Attempt at a Solution

1.20x10^22 fissions/s = 1.0368 fissions/day

550 days = 5.7x10^29 fissions

5.7x10^29 fissions = 225376210.5 grams

225376210.5 grams / 70 000 grams = 3219.66%. Which is incorrect.

Last edited:
The initial value of 1.2x10^22 fissions/s can't be right. At ~ 200MeV/fission, this is about 400 GW.

## 1. What does "CANDU Reactor contains 70 kf og fissionable material" mean?

The "CANDU Reactor contains 70 kf og fissionable material" refers to the Canadian Deuterium Uranium (CANDU) nuclear reactor, which is designed to use natural uranium as its fuel source. The "70 kf" refers to the 70,000 megawatt-days per tonne (MWD/MT) of energy that can be produced from the fission of uranium atoms.

## 2. How does the CANDU Reactor use fissionable material to generate energy?

The CANDU Reactor uses a process called nuclear fission, in which the nuclei of uranium atoms are split, releasing a tremendous amount of energy in the form of heat. This heat is then used to produce steam, which turns a turbine to generate electricity.

## 3. Is 70 kf of fissionable material a lot?

Yes, 70 kf of fissionable material is a significant amount of energy. To put it into perspective, 1 kg of uranium-235 (a common isotope used in nuclear reactors) can produce approximately 24 million kilowatt-hours (kWh) of electricity, which is enough to power a typical household for over 2,000 years.

## 4. How does the CANDU Reactor differ from other nuclear reactors?

The CANDU Reactor differs from other nuclear reactors in that it uses heavy water (deuterium oxide) as both its coolant and moderator, rather than regular water or graphite. This allows it to use natural uranium as its fuel source, rather than enriched uranium, making it a more cost-effective and versatile option.

## 5. Is the CANDU Reactor safe to use?

Yes, the CANDU Reactor is considered to be a safe and reliable form of energy production. It has numerous safety features, such as a negative temperature coefficient (meaning that as the temperature rises, the reactor slows down), passive cooling systems, and multiple barriers to prevent the release of radioactive materials in case of an accident.