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Large-diameter double-nozzle-seat massive forging type main pipeline hot section structure

A technology for taking over the seat and the main pipeline, which can be used in the fields of reactors, greenhouse gas reduction, nuclear engineering, etc., and can solve the problems of high cost and difficult manufacturing.

Pending Publication Date: 2018-10-12
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the hot section of a large-scale passive 1.4 million-kilowatt integrated forged main pipe weighs about 17 tons, and its steel ingot weighs 120 tons, which is very costly and difficult to manufacture

Method used

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  • Large-diameter double-nozzle-seat massive forging type main pipeline hot section structure
  • Large-diameter double-nozzle-seat massive forging type main pipeline hot section structure
  • Large-diameter double-nozzle-seat massive forging type main pipeline hot section structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 1 and figure 2 As shown, the large-diameter double-connection seat integral forged main pipe hot section structure in this embodiment includes the main pipe hot-section body 1, wave pipe connection seat 2 and ADS connection seat 3, and the wave pipe connection seat 2 and ADS The connecting seat 3 is integrally forged and integrally forged with the hot section body 1 of the main pipeline.

[0038] The centerline of the fluctuating pipe connecting seat 2 and the central line of the ADS connecting seat 3 are located on the same vertical plane as the centerline of the hot section body 1 of the main pipe, between the centerline of the wave pipe connecting seat 2 and the centerline of the ADS connecting seat 3 The included angle is 135°.

Embodiment 2

[0040] like image 3 and Figure 4 As shown, the large-diameter double-connection seat integral forged main pipe hot section structure in this embodiment includes the main pipe hot-section body 1, wave pipe connection seat 2 and ADS connection seat 3, and the wave pipe connection seat 2 and ADS The connecting seat 3 is integrally forged and integrally forged with the hot section body 1 of the main pipeline.

[0041] The centerline of the fluctuating pipe connecting seat 2 and the central line of the ADS connecting seat 3 are located on the same vertical plane as the centerline of the hot section body 1 of the main pipe, between the centerline of the wave pipe connecting seat 2 and the centerline of the ADS connecting seat 3 The included angle is 90°.

[0042] In combination with embodiment 1, the included angle between the centerline of the fluctuating pipe socket 2 and the centerline of the ADS socket 3 may be between 45°-135°.

Embodiment 3

[0044] like Figure 5 and Image 6 As shown, the large-diameter double-connection seat integral forged main pipe hot section structure in this embodiment includes the main pipe hot-section body 1, wave pipe connection seat 2 and ADS connection seat 3, and the wave pipe connection seat 2 and ADS The connecting seat 3 is integrally forged and integrally forged with the hot section body 1 of the main pipeline.

[0045] The center line of the fluctuating pipe connecting seat 2 and the center line of the ADS connecting seat 3 are located on two parallel vertical surfaces of the center line of the hot section body 1 of the main pipeline, and the ADS connecting seat 3 is located behind the wave pipe connecting seat 2 along the incoming flow direction. The included angle between the center line of the fluctuating pipe connection seat 2 and the center line of the ADS connection seat 3 is 135°.

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Abstract

The invention aims to disclose a large-diameter double-nozzle-seat massive forging type main pipeline hot section structure which comprises a main pipeline hot section body, a surge nozzle seat and anADS (Automatic Decompression System) nozzle seat. The surge nozzle seat and the ADS nozzle seat are massively forged and are integrally forged with the main pipeline hot section body; the surge nozzle seat and the ADS nozzle seat are arranged on a long straight section of the main pipeline hot section body respectively. Compared with the prior art, through the integrated forging of the surge nozzle seat, the ADS nozzle seat and the main pipeline hot section body, the number of welded joints is reduced, the welding duration is reduced, the inservice inspection workload of a high-level radioactive area is greatly reduced, the surge pipeline thermal stratification stress is reduced, the steam discharge function demand of an ADS nozzle under the accidental condition is met, the requirement onthe hole position of an ASME NB-3683.8 nozzle seat is met, the consumption of steel ingots for forging the nozzle seats is reduced, the forging times is reduced, the processing volume of a main pipeline manufacturing machine is reduced, the grain fineness number of a nozzle part is improved, the manufacturing difficulty is reduced, the main pipeline manufacturing cost is reduced, and the aims ofthe large-diameter double-nozzle-seat massive forging type main pipeline hot section structure provided by the invention is achieved.

Description

technical field [0001] The invention relates to a large-diameter main pipe of a reactor coolant system in a nuclear power plant, in particular to a hot-section structure of a large-diameter double-connection socket monolithic forged main pipe of the reactor coolant system of a nuclear power plant. Background technique [0002] In the reactor coolant system in a nuclear power plant, the reactor coolant pipeline (hereinafter referred to as the main pipeline) is used as the flow channel of the reactor coolant, which is an extremely important pressure boundary in the primary loop reactor coolant system and a means to prevent the leakage of the primary loop material. security barrier. [0003] The existing reactor coolant pipeline (hereinafter referred to as the main pipeline) usually consists of a hot section and a cold section. The hot section connects the reactor pressure vessel (RPV) and the steam generator (SG). The main pipeline hot section usually includes two or more hot ...

Claims

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Application Information

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IPC IPC(8): G21C15/02
CPCG21C15/02Y02E30/30
Inventor 张玉施永兵邱健夏栓徐臻关岭松胡波蔡友强
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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