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Nuclear Power02:36

Nuclear Power

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons...
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A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
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Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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Structural and Parametric Optimization of S-CO2 Nuclear Power Plants.

Nikolay Rogalev1, Andrey Rogalev2, Vladimir Kindra2

  • 1Department of Thermal Power Plants, National Research University "Moscow Power Engineering Institute", 111250 Moscow, Russia.

Entropy (Basel, Switzerland)
|August 27, 2021
PubMed
Summary

Supercritical carbon dioxide (S-CO2) power cycles offer enhanced efficiency and safety for nuclear power plants. Transitioning to S-CO2 Brayton cycles is beneficial above 455°C due to superior regeneration.

Keywords:
efficiencyoptimizationpower plantsupercritical carbon dioxidethermodynamic cycle

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Area of Science:

  • Nuclear Engineering
  • Thermodynamics
  • Energy Systems

Background:

  • Supercritical carbon dioxide (S-CO2) is a promising working fluid for advanced power generation.
  • S-CO2 cycles offer potential advantages in terms of efficiency, component size, and environmental safety compared to traditional cycles.
  • Nuclear power plants are exploring S-CO2 technology for improved performance and sustainability.

Purpose of the Study:

  • To perform structural and parametric optimization of S-CO2 nuclear power plants.
  • To determine the feasibility and benefits of transitioning from a water-based Rankine cycle to an S-CO2 Brayton cycle.
  • To identify the optimal operating conditions for S-CO2 cycles in nuclear applications.

Main Methods:

  • Mathematical modeling and simulation of S-CO2 power cycles.
  • Comparative analysis of Rankine (water) and Brayton (S-CO2) cycles.
  • Parametric studies to optimize plant efficiency and component design.

Main Results:

  • The transition to an S-CO2 working fluid for the BREST-OD-300 reactor increased efficiency from 39.8% to 43.1%.
  • S-CO2 power generation units can achieve significant reductions in equipment size.
  • The S-CO2 Brayton cycle with recompression is advantageous over the Rankine cycle at working fluid temperatures exceeding 455°C.

Conclusions:

  • Implementing S-CO2 technology in nuclear power plants enhances electricity production efficiency and environmental safety.
  • The S-CO2 Brayton cycle's superior regeneration system makes it a viable and efficient alternative to the Rankine cycle at higher temperatures.
  • Optimization of S-CO2 cycles is crucial for maximizing energy output and realizing the full potential of this technology in nuclear energy.