Nuclear Energy Systems at EPFL - EPF Lausanne | Flashcards & Summaries

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Lernmaterialien für Nuclear Energy Systems an der EPFL - EPF Lausanne

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TESTE DEIN WISSEN

Three naturally occurring isotopes of Uranium and relative abundance?

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TESTE DEIN WISSEN

U-234: 0.005%

U-235: 0.72%

U-238: 99.275%

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TESTE DEIN WISSEN

At what element does fusion stop being exothermic?

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TESTE DEIN WISSEN

Iron (Fe)

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TESTE DEIN WISSEN

Free neutron half life?


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TESTE DEIN WISSEN

10.2 minutes

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TESTE DEIN WISSEN

Why do we need enrichment?

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TESTE DEIN WISSEN

We want a self-sustaining chain reaction and to do that, we must increase the reaction rate. The reaction rate is dependent on the density of the reacting nuclide, in this case U-235. By increasing the density of U-235, we increase the reaction rate.

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TESTE DEIN WISSEN

How does the U-235 concentration change during enrichment?

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TESTE DEIN WISSEN

From 0.72% to 4-5% U-235

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TESTE DEIN WISSEN

What is the purpose of the inert pellet in the fuel assembly?

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TESTE DEIN WISSEN

????

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TESTE DEIN WISSEN

How can the fuel pellet change during irradiation?

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TESTE DEIN WISSEN

The shape of the fuel pellet can become distorted, resulting in "bamboo-ing" of the entire fuel rod. The pellet can eventually swell greater than the helium gap and touch the cladding, affecting the temperature of both. 

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TESTE DEIN WISSEN

What happens to the fission gas in the fuel pellet?

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TESTE DEIN WISSEN

As U-235 in the pellet fissions, the gas products diffuse and collect in existing pores. They form bubbles that enlarge and diffuse to the grain boundaries. The fission gases are released from corner channels or cracks. 20-30% of fission gas moves to the plenum. 

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TESTE DEIN WISSEN

Obstacles to CANDU?

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TESTE DEIN WISSEN

- Heavy water production

- Proliferation - produces Pu from pressurized fuel tubes

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TESTE DEIN WISSEN

Does the mass number (N) change in Beta decay?

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TESTE DEIN WISSEN

No, in Beta minus decay a neutron turns into a proton and electron and antineutrino so the mass number stays the same. In Beta plus decay, a proton turns into a neutron, electron, and neutrino.

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TESTE DEIN WISSEN

Which nuclear fusion reaction has the highest cross section?

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TESTE DEIN WISSEN

D-T: D + T = Alpha + n(14MeV) 

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TESTE DEIN WISSEN

Atomic number of Uranium?

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TESTE DEIN WISSEN

Z = 92

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Q:

Three naturally occurring isotopes of Uranium and relative abundance?

A:

U-234: 0.005%

U-235: 0.72%

U-238: 99.275%

Q:

At what element does fusion stop being exothermic?

A:

Iron (Fe)

Q:

Free neutron half life?


A:

10.2 minutes

Q:

Why do we need enrichment?

A:

We want a self-sustaining chain reaction and to do that, we must increase the reaction rate. The reaction rate is dependent on the density of the reacting nuclide, in this case U-235. By increasing the density of U-235, we increase the reaction rate.

Q:

How does the U-235 concentration change during enrichment?

A:

From 0.72% to 4-5% U-235

Mehr Karteikarten anzeigen
Q:

What is the purpose of the inert pellet in the fuel assembly?

A:

????

Q:

How can the fuel pellet change during irradiation?

A:

The shape of the fuel pellet can become distorted, resulting in "bamboo-ing" of the entire fuel rod. The pellet can eventually swell greater than the helium gap and touch the cladding, affecting the temperature of both. 

Q:

What happens to the fission gas in the fuel pellet?

A:

As U-235 in the pellet fissions, the gas products diffuse and collect in existing pores. They form bubbles that enlarge and diffuse to the grain boundaries. The fission gases are released from corner channels or cracks. 20-30% of fission gas moves to the plenum. 

Q:

Obstacles to CANDU?

A:

- Heavy water production

- Proliferation - produces Pu from pressurized fuel tubes

Q:

Does the mass number (N) change in Beta decay?

A:

No, in Beta minus decay a neutron turns into a proton and electron and antineutrino so the mass number stays the same. In Beta plus decay, a proton turns into a neutron, electron, and neutrino.

Q:

Which nuclear fusion reaction has the highest cross section?

A:

D-T: D + T = Alpha + n(14MeV) 

Q:

Atomic number of Uranium?

A:

Z = 92

Nuclear Energy Systems

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