First physical start-up method for pressurized water reactor without external neutron source

A neutron source, pressurized water reactor technology, applied in the control of reactors, nuclear reactions, and reduction of greenhouse gases, etc., can solve the problems of increasing the construction cost of power plants, increasing the dose of personnel and equipment, and increasing the cost of human and material resources, so as to reduce The generation of radioactive solid waste, the elimination of potential risks, and the effect of saving procurement costs

Inactive Publication Date: 2018-11-02
JIANGSU NUCLEAR POWER CORP
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  • Claims
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Problems solved by technology

This method has some disadvantages: the external neutron source has strong radioactivity, and the requirements for the transportation and storage of neutron source components are high, which increases the cost of manpower and material resources; when the external neutron source is used in the reactor, the source cladding may be damaged , which increases the radioactivity of the primary circuit and increases the exposure dose of personnel and equipment; the neutron source used needs to be stored and disposed of as radioactive waste, which increases the amount of radioactive solid waste generated by the power station; the high cost of neutron source procurement increases the construction cost of the power station

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  • First physical start-up method for pressurized water reactor without external neutron source
  • First physical start-up method for pressurized water reactor without external neutron source

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Embodiment

[0039] In this embodiment, with figure 1 The corresponding PWR unit is used as the description object to introduce this method, where U16, U24, and U36 indicate that the average enrichment degree distribution of 235U in the fuel assembly is 1.6%, 2.4% and 3.6%, and U24G7 and U36G7 indicate this type of fuel The assembly contains uranium-gadolinium integrated fuel rods. The present invention utilizes the characteristic of natural uranium 238 spontaneous fission in the fuel to produce neutrons to start the reactor, and the specific implementation is as follows:

[0040] (1) Design high-leakage core loading. The loading of core fuel assemblies adopts a high-leakage arrangement, that is, the fuel assemblies with the highest enrichment degree are arranged on the periphery of the core, and the fuel assemblies with lower enrichment degrees are arranged in the middle of the core core, which effectively increases the probability of neutron leakage in the core. probability, it is bene...

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Abstract

The invention belongs to the technical field of reactor engineering design and operation and in particular relates to a first physical start-up method for a pressurized water reactor without an external neutron source. The invention aims to provide a physical start-up method without an external neutron source aiming at the defects in the prior art, so that the reactor can safely and effectively reach a critical state. The first physical start-up method for the pressurized water reactor without the external neutron source comprises the following steps: 1, designing a high-leakage core loading pattern; 2, determining an appropriate positive reactivity introduction rate; 3, selecting a neutron flux measurement device of high precision and sensitivity; 4, strictly limiting clean water isolation measures; 5, continuous boric acid concentration monitoring; and 6, strictly setting and controlling the constant value of a protection system.

Description

technical field [0001] The invention belongs to the technical field of reactor engineering design and operation, and in particular relates to a first physical start-up method of a pressurized water reactor without an external neutron source. Background technique [0002] After the first fuel loading of a newly constructed reactor, it is necessary to gradually introduce positive reactivity into the core in some way, so that the reactor can reach the critical state from the subcritical state that meets the safety requirements, and start a self-sustaining chain fission reaction. The first time a reactor reaches criticality from a subcritical state is called the first physical start-up. The first physical start-up is an important milestone event for the operation of the reactor. At this time, because the nuclear design characteristics of the newly loaded reactor are theoretically calculated values, which have not been tested and verified by operation, there is a certain degree o...

Claims

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Application Information

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IPC IPC(8): G21C7/00G21C7/02
CPCG21C7/00G21C7/02Y02E30/30
Inventor 杨晓强李载鹏黄鹏李友谊潘泽飞
Owner JIANGSU NUCLEAR POWER CORP
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