7 results about "Boiling water reactor" patented technology

A nuclear fuel rod for a pressurised or boiling water reactor, the rod having a corrosion-resistant tube with an external surface comprising a textured pattern 100. The textured patter has first areas

During normal operation of a boiling water reactor, the thermal margin of the fuel assembly can be improved, and during shutdown and in the event of a reactivity-injected accident at cold temperatures, the void condensation effect can be reduced, thereby suppressing the rise in fuel enthalpy and reducing the risk of fuel rod damage. [Solution] A fuel spacer 15M is a component of a fuel assembly loaded into the core of a boiling water reactor, in which a plurality of fuel rods 11, each supported at both ends by an upper tie plate and a lower tie plate, are bundled together at intervals from one another. The spacer has a swirling vane 18 that generates a swirling flow in the coolant W flowing from the lower tie plate to the upper tie plate. The swirling vane is configured to be able to change direction so that it is tilted toward the fuel rods 11 during normal operation of the boiling water reactor, and faces in a vertical direction A along the lower tie plate to the upper tie plate when the boiling water reactor is shut down or when it is cold.

A BWR channel box comprises a substrate, a first layer, and a second layer. The substrate comprises silicon carbide fibers. The first layer is deposited on a first surface of the substrate. The second layer is deposited on an opposite second surface of the substrate. Each layer comprises a corrosion resistant metallic composition. The combined weight of both layers is in a range from greater than 0% to 10% of the total weight of the channel box.

The invention relates to a method for preparing methanol. The method comprises the following steps: (a) preparing a hydrogen raw material through electrolysis; (b) providing a carbon oxide feedstock during the electrolysis operation in step (a); (c) mixing at least part of the hydrogen feed and a carbon oxide source consisting of a carbon monoxide and / or carbon dioxide feed to obtain methanol syngas; (d) adjusting the molar content of hydrogen, carbon monoxide and / or carbon dioxide in step (c) to a modulus M of 1.9 to 2.2, said modulus M being (H2-CO2) / (CO2 + CO); (e) converting the methanol syngas to methanol in one or more boiling water reactors; during the electrolysis inoperation in step (a): (f) interrupting the conversion of methanol syngas by heat exchange with boiling water in one or more boiling water reactors, in which step (f) the one or more boiling water reactors are heated by one or more auxiliary heaters to maintain boiling of water in the one or more boiling water reactors.

A methanol loop, and a methanol plant including said methanol loop, are provided. In addition to conventional components, the methanol loop comprises one or more additional heat exchangers, arranged to make best use of the heat energy in the effluent stream from the boiling water reactor. Processes for synthesising methanol in the methanol plants of the invention are also provided.

This invention relates to light water nuclear reactors, particularly pressurized water reactors (PWRs) or boiling water reactors, including an integrated autonomous passive decay heat removal system. The invention discloses a light water nuclear reactor (LWR), particularly a PWR or BWR, comprising: - a reactor core; - a system for removing at least some decay heat from the reactor core, comprising: a first water reservoir or pool disposed above the reactor core; a heat exchange device immersed in the pool; an organic Rankine cycle; a fluid loop; a second water reservoir different from the pool; and a second pump. The invention lies in installing an organic Rankine cycle and a supplementary water reservoir different from the pool, wherein the energy stored in the pool is the heat source for the organic Rankine cycle evaporator, and the supplementary water reservoir directly supplies the organic Rankine cycle condenser via a dedicated pump to constitute the cold source for the organic Rankine cycle condenser.