Glass-metal sealing material for pressurized water reactor electrical penetration assembly conductor assembly and preparation method

Abstract

The invention discloses a glass-metal sealing material for a conductor assembly of an electrical penetration assembly of a pressurized water reactor and a preparation method of the glass-metal sealing material. The preparation method comprises the following steps: weighing according to a set glass material ratio, and uniformly mixing the raw materials to obtain a batch; the batch comprises the following components in percentage by weight on the basis of oxides: 50 to 70 percent of SiO2, 8 to 13 percent of B2O3, 4 to 8 percent of Al2O3, 3 to 8 percent of Na2O, 2 to 4 percent of CeO2, 0 to 2 percent of K2O, 0 to 2 percent of TiO2, 0 to 2 percent of CaO, 0 to 1 percent of ZrO2 and 0 to 1 percent of CoO. The preparation method comprises the following steps: melting the batch at 1550-1650 DEG C, quenching to obtain glass slag, carrying out ball milling on the glass slag, and carrying out spray granulation to obtain granulation powder with a certain particle size and sphericity. And preparing the granulated powder into a glass blank with a required shape by compression molding, and placing the glass blank at a certain temperature for glue removal and vitrification to obtain the prefabricated glass bead. And assembling the metal shell, the metal conductor and the prefabricated glass bead, and sealing in an atmosphere furnace to obtain the glass-metal sealed electrical penetration assembly conductor assembly. The conductor assembly prepared by the method has the characteristics of high air tightness, high insulativity, radiation resistance, flame retardance and the like.

Description

technical field [0001] The invention relates to the technical field of nuclear reaction safety, in particular to a glass-metal sealing material used for a conductor assembly of a pressurized water reactor electrical penetration and a preparation method thereof. Background technique [0002] The full name of the pressurized water reactor is "pressurized water moderated cooling reactor". A reactor that uses pressurized, non-boiling light water (that is, ordinary water) as the moderator and coolant. It is composed of fuel assembly, moderator (also used as coolant), control rod assembly, burnable poison assembly, neutron source assembly, core basket and pressure vessel, etc. It is a reactor with a large number of applications and a large capacity in nuclear power plants. type. [0003] PWR electrical penetrations are special electrical equipment installed on the reactor containment for cables to pass through the containment. Under normal and various accident conditions, the el...

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Problems solved by technology

[0005] Although polymer sealing materials can meet the strict standards of electrical penetrations in terms of performance, aging phenomena such as embrittlement and creep will inevitably occur in polymer materials during long-term operation and life-extending operation. Risk of loss of sealing and insulation functions in case of high radiation accidents

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