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

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...

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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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