Nuclear grade water filter element filter material and preparation method thereof

Abstract

The invention discloses a nuclear-grade water filter filter element filter material and a production method thereof. The nuclear-grade water filter filter element filter material comprises a base material, which is made from micro-glass cellucotton with an alkali metal content larger than 9%, and a non-woven fabric attached onto the upper and lower surfaces of the base material; and the base material and the non-woven fabric are dried and stuck together in waterborne resin after being subjected to negative-pressure suction. The filter precision of the filter material produced through the method is smaller than or equal to 1 [mu]m, the air permeability at 200 Pa is equal to or larger than 36 L / m<2> / sec, and the tensile strength is equal to or larger than 0.2 kN / m; and the nuclear-grade water filter filter element filter material has high water flow impact resistance capability, the strength retention rate after the nuclear-grade water filter filter element filter material is treated by a 50 g / L (50%) sodium hydroxide solution at 23+ / -2 DEG C for 7 days can reach 60% or above, and the requirements of the water quality of a primary loop of a nuclear power plant are met.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant water filtration, in particular to a nuclear-grade water filter element filter material and a preparation method thereof. Background technique [0002] The primary circuit is the aorta of the PWR nuclear power plant, and its safety is particularly important in the entire nuclear power plant. In the primary loop system, there are corrosion products, suspended solid particles and various ions in the water in the form of colloids. Most of the corrosion products have a particle size of more than 5 μm, and they deposit on the heat transfer surface of the reactor circuit, reducing the heat transfer efficiency. When it accumulates too much, it may cause blockage of local flow passages in the core or overheating of heat exchange surfaces, causing serious accidents. In addition, when the reactor is shut down for maintenance, the radioactivity in the deposited activated corrosion products bring...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of the existing nuclear-grade water filter element filter material with low filtration precision and poor water impact resistance, the present invention provides a nuclear-grade water filter element filter material and a preparation method thereof. Filtration accuracy of filter material ≤1μm, air permeability ≥36L / m under 200Pa pressure 2 / sec, tensile strength ≥ 0.2kN / m; strong resistance to water flow impact, after 7 days of treatment with 50g / L (5%) sodium hydroxide solution at 23°C ± 2°C, the strength retention rate can reach 60 More than %, meeting the water quality requirements of the primary circuit of nuclear power plants

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