System for evaluating aging state of non-metallic material under ETA+NH3 condition

Abstract

The invention belongs to the technical field of nuclear power safety evaluation, and particularly discloses a system for evaluating the aging state of a non-metallic material under the ETA+NH3 condition. The system comprises a soaking aging system and a dynamic water chemical circulation system. The soaking and aging system comprises a plurality of high-pressure kettles with a heating function, each high-pressure kettle is provided with a water adding opening, a liquid inlet and a liquid outlet, and the interiors of the high-pressure kettles are used for placing non-metallic materials; each high-pressure kettle is provided with a dynamic water chemical circulating system, and each dynamic water chemical circulating system comprises a circulating pump, a pumping-in pipeline and a pumping-out pipeline; a resin bed is arranged on the pumping pipeline, and a dosing pipeline is arranged between the resin bed and the circulating pump; and a water chemical measurement module with the functions of measuring pH, dissolved oxygen and conductivity is arranged at the rear end of the position where the dosing pipeline is arranged on the pumping-in pipeline or on the pumping-out pipeline. The system can effectively evaluate the use feasibility of the ETA in the secondary circuit, and lays a foundation for the use of the ETA.

Description

technical field [0001] The invention belongs to the technical field of nuclear power safety assessment, and in particular relates to a method for evaluating non-metallic materials in ETA+NH 3 Aging state of the system under conditions. Background technique [0002] The main function of the secondary circuit system of the nuclear power plant is to supply the saturated steam generated by the steam generator for the work of the steam turbine generator set, and also provide steam for use by other auxiliary equipment of the power plant. Most of the equipment in the secondary circuit system is made of carbon steel, which is prone to oxygen absorption corrosion, so water chemistry control is required. The water chemical control method of the secondary circuit system often adopts the all-volatile (AVT) treatment method, that is, by adding ammonia and Hydrazine is used to increase the pH value of water and remove oxygen, so as to slow down the corrosion of equipment. However, in AV...

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Problems solved by technology

However, in AVT treatment, the pH value of the hydrophobic system is obviously low due to the unbalanced vapor-liquid distribution ratio of ammonia. At present, the pH value of the secondary circuit feed water is controlled at 9.5-9.6, while the pH value of the MS hydrophobic system is only 9.0, and the hydrophobic The pH value of the system is too low, which increases the risk of flow-accelerated corrosion of the system piping equipment and brings safety hazards to the operation of the power plant; in addition, due to the limitation of the characteristics of ammonia, increasing the pH of the hydrophobic system by increasing the ammonia concentration of the feed water will cause a burden on the finishing system too heavy to implement

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