Method for the control of a boiling water reactor and a boiling water reactor for performing said method专利检索-自然对流物理专利检索查询-专利查询网

Method for the control of a boiling water reactor and a boiling water reactor for performing said method

阅读：162发布：2022-11-10

专利汇可以提供Method for the control of a boiling water reactor and a boiling water reactor for performing said method专利检索，专利查询，专利分析的服务。并且The invention relates to the control of a boiling water reactor in which the water circulates by natural convection in the reactor tank through the core, a riser above the core and a downcomer. By varying the water level in the downcomer, the flow rate of circulation and thereby the void fraction in the core and the reactivity are changed. The water level in the downcomer may be adjusted by transferring water to or from an auxiliary reservoir. The local circulation flow rate may be influenced by having a graded riser and by the use of nozzles.，下面是Method for the control of a boiling water reactor and a boiling water reactor for performing said method专利的具体信息内容。

权利要求

1. A boiling water nuclear reactor with self-regulated reactivity and steam production, and comprising: a. a reactor tank; b. a reactor core enclosed in said tank; c. a riser on the top of said core; d. an inner amount of water between the core and the riser on one hand and the tank on the other hand, the surface level of the water being set below the upper edge of the riser; e. an outer amount of water communicating with said inner amount of water; f. a steam chamber provided with a steam outlet and disposed above and in direct contact with the riser and said surface level of the inner amount of water; g. an internally flowing column of water and steam mixture; extending through the core and the riser, the steam content of said column being produced by the core reactivity and supplied to said steam chamber; h. a water circulation comprising said inner amount of water and said flowing column of water and steam mixture, the driving force of said circulation being constituted by the difference of pressures exerted by said inner water amount and said column, respectively, at the level of the bottom of the reactor core, whereby self-regulation is achieved by the following closed chain of cause and effect: Change of steam chamber pressure -> change of inner amount of water -> change of pressure difference at bottom of the core -> change of water circulating flow -> change of the steam content of the column of water and steam mixture -> change of the core reactivity -> change of steam supply to the chamber -> steam chamber pressure change opposing said given change of steam pressure.

2. A reactor as claimed in claim 1, wherein the riser, by way of vertical partitions, is subdivided into a number of parallel flow sections with different heights increasing in steps inwardly from the outer edges of the riser, to define a corresponding predetermined grading in steps of the top surface of the same.

3. A reactor as claimed in claim 2, wherein at least some of said parallel flow sections are provided with removable water distribution nozzles in their lowermost parts.

4. A reactor as claimed in claim 1, wherein the reactor tank is stationary mounted in said auxiliary reservoir below the surface of the outer amount of water.

5. A reactor as claimed in claim 4, wherein said reactor tank is mounted significantly deeper below said surface than the vertical extension of the tank.

6. A reactor as claimed in claim 1, wherein said steam outlet is provided with at least one branch conduit ending blindly in the auxiliary reservoir at a level above the reactor core.

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Method for the control of a boiling water reactor and a boiling water reactor for performing said method

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