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Mechanically-sealing four-coaxial cable termination technology

A technology of mechanical seals and cable ends, which is applied in the field of nuclear measurement systems outside the core of nuclear power plants, and can solve problems such as low first-time success rate, delayed construction progress, waste of materials, etc.

Active Publication Date: 2017-08-29
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a mechanically sealed four-coaxial cable termination process with a high one-time success rate, saving materials and manpower, and making the performance of the joint more stable and safe. The coaxial cable termination of the measurement system instrument has a low success rate at one time, wastes materials, and delays the construction progress

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  • Mechanically-sealing four-coaxial cable termination technology
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Embodiment Construction

[0165] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0166] The present invention is a mechanically sealed four-coaxial cable termination process, AP1000 nuclear power plant nuclear measurement system (NIS), such as Figure 35 As shown, it includes the following steps:

[0167] Step 1. Termination preparations include the following aspects:

[0168] Step 1.1, select the production environment temperature to be above 0°C and relative humidity below 80%;

[0169] Step 1.2, clean up the sundries, including dust, to ensure that the environment during the entire termination process is clean;

[0170] The above step 1.2 starts after the cold test of the unit. At this time, there is no work on the production site that affects the environment, and the leakage of various pipes has basically been eliminated;

[0171] Step 1.3, make a simple operating table, and clamp a table vise on the ed...

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Abstract

The invention discloses a mechanically-sealing four-coaxial cable termination technology. The technology is characterized by comprising the steps of 1) preparation of termination; 2) processing a spiral copper armored casing; 3) welding a cable sealing support; 4) inspecting the appearance after welding; 5) leak detection; 6) preparation of a three-coaxial cable joint; 7) inspecting the size of the completed three-coaxial cable joint; and 8) installing a sealing device. According to the invention, the defect that the first pass yield of the coaxial cable of a nuclear power station is low traditionally is overcome, the first pass yield can reach 100% according to verification in the San Men nuclear power station AP1000, a lot of materials and labor force can be saved, the joint is more stable and safer in operation due to advancement of the technology, and a test channel of an out-of-core nuclear test system can be used for 60 years, which is 20 yeas more than that of traditional products of the same kind, under severe environments of high temperature, high humidity and high irradiation.

Description

technical field [0001] The invention relates to a coaxial cable termination process of a nuclear power plant nuclear measurement system (NIS), in particular to a mechanically sealed four-coaxial cable termination process, which belongs to the technical field of nuclear power plant nuclear measurement systems. Background technique [0002] The nuclear measurement system (NIS) in a nuclear power plant uses external nuclear measurement instruments to detect neutrons leaked from the reactor to control the reaction speed and trigger shutdown to ensure reactor safety. The signal detected by the nuclear testing instruments outside the reactor is extremely weak, at the μA level. Therefore, it is extremely difficult to master the instrument cable and cable termination process of the extracore nuclear measurement system. Historically, the first-time success rate of instrument cable termination for the second phase of the Qinshan nuclear power plant’s nuclear measurement system was on...

Claims

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Application Information

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IPC IPC(8): H01R43/042H01R43/02H01R43/28H01R43/18
CPCH01R43/02H01R43/042H01R43/18H01R43/28
Inventor 付贵龙李伟彪阳路林
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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