Method for determining content of anions in cleaning fluid of nuclear pump

Abstract

The invention provides a method for determining the content of anions in a cleaning fluid of a nuclear pump. The method comprises the following steps: determining the peak area of the anions in an anion mixed standard solution by adopting an ion chromatography, and establishing a standard curve, wherein the anions comprise F<->, Cl<-> and SO4<-2>; pretreating a to-be-cleaned fluid of a nuclear pump so as to obtain a to-be-cleaned fluid of a pretreated nuclear pump; and determining the peak area of the anions in the to-be-cleaned fluid of the pretreated nuclear pump by adopting the ion chromatography so as to obtain the concentration of the anions in the nuclear pump cleaning fluid according to the peak area and the established standard curve. The method basis is provided for the determination of the content of the anions in the cleaning fluid of the nuclear pump; the method provided by the invention is easy to operate, and is relatively good in reproducibility; the method is the one of the key factors for guaranteeing that the cleaning fluid of the nuclear pump achieves the requirement, so that the condition that the produced and manufactured nuclear grade main pump anions meeting the relevant anti-fouling requirement is guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of ion content in a nuclear pump cleaning solution, and particularly relates to a method for measuring anion content in a nuclear pump cleaning solution. Background technique [0002] Nuclear pumps play an important role in the entire nuclear power plant. The special working conditions of nuclear pumps determine that if nuclear pump materials are contaminated, pollutants may enter the loop and cause the following hazards: activation of reactor core deposits; deposition Substances have an adverse effect on moving parts; local (or overall) corrosion of stainless steel alloys; deposits cause a decrease in heat exchange. Therefore, the surface cleanliness of nuclear pump materials is an important issue in the development and manufacturing of nuclear pumps. [0003] Whether it is ASME (American Society for Testing and Materials) or RCC-M (Design and Construction Rules for Pressurized Water Reactor Nuclear Island Mechan...

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Problems solved by technology

[0004] Although the ASME and RCC-M codes have clarified the guiding principles for the anti-pollution of nuclear pump materials, the main equipment manufacturers of nuclear islands have also put forward very strict requirements for the anti-pollution acceptance standards of nuclear pump materials. There are strict requirements on the content of inorganic anions in the cleaning materials, such as the fluorine content not exceeding 200ppm, the chlorine content not exceeding 200ppm and the sulfur content not exceeding 250ppm, but for the wiping process method on the surface of the primary nuclear main pump with a design life of 60 years There is no standard in our country, and there is no clear regulation on the detection method of inorganic anions in cleaning materials

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