Thimble assembly of in-core instrument for nuclear power station

A core instrument and nuclear power plant technology, applied in the field of core nuclear measurement instrument, can solve the problems of short life, scattered interfaces, etc., and achieve the effect of improving service life, not easy to aging, and reducing electromagnetic interference

Active Publication Date: 2017-03-22
浙江伦特机电有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a core nuclear measuring instrument integrating thermocouples and self-powered neutron detectors to solve the problems of scattered interfaces and short service life of existing nuclear nuclear measuring instruments

Method used

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  • Thimble assembly of in-core instrument for nuclear power station
  • Thimble assembly of in-core instrument for nuclear power station
  • Thimble assembly of in-core instrument for nuclear power station

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as Figure 1 to Figure 3 As shown, a core instrument bushing assembly for a nuclear power plant includes a dust cover 1, an electrical connector 2, a rear shell 3, a connecting pipe 4, a flexible metal conduit 5, a header connecting pipe 6, a header 7, and a joint 8. Shell 9, armored thermocouple 10, neutron detector 11, extension section 12, extension section joint 13, bullet end plug 14.

[0042] The armored thermocouple 10 and multiple neutron detectors 11 are fixed to the manifold 7 by brazing, and the armored thermocouple 10 and neutron detectors 11 are welded together with the extension section 12 and the extension section joint 13 . The neutron detector 11 is a self-sufficient neutron detector, consisting of emitters, collectors, insulators and cables, the length of the longest neutron detector 11 among the multiple neutron detectors 11 corresponds to the height of the entire reactor core, The lengths of the remaining neutron detectors 11 decrease at equal ...

Embodiment 2

[0045] Such as Figure 2 to Figure 8 As shown, the difference between Embodiment 2 and Embodiment 1 is that one or more armored thermocouples 10 are provided, and one or more liquid level monitoring thermocouples 15 are additionally provided. Liquid level monitoring thermocouple 15 is fixed together with armored thermocouple 10 brazing 16 ( Figure 6 )

[0046] Multiple armored thermocouples 10 are used to monitor the temperature measurement points of the coolant at the inlet of the fuel assembly, the temperature measurement points of the local area of ​​the fuel element outlet of the fuel assembly, the temperature measurement points of the TBC outlet of the fuel assembly, and the temperature measurement points under the reactor top cover.

[0047] The liquid level monitoring thermocouple 15 is composed of TPIU with electric heater and thermocouple TP without electric heater. Under normal working conditions, both TPIU with electric heater and thermocouple TP without electric he...

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Abstract

The invention relates to a thimble assembly of an in-core instrument for a nuclear power station. The thimble assembly comprises armored thermocouples, a header and neutron detectors, wherein at least one armored thermocouple and a plurality of neutron detectors are soldered and fixed together via the header; each neutron detector is a self-powered neutron detector composed of a transmitter, a collecting body, an insulator and a cable; the longest neutron detector of the plurality of neutron detectors has a length identical to the height of the whole reactor core; and the lengths of the rest neutron detectors gradually decrease at an equal interval on the base of the length of the longest neutron detector, or the neutron detectors are of a same length and axially distributed at an equal interval. The thimble assembly is simple and firm in structure and small in size and can adapt to complex environments in reactors. The thimble assembly is applicable to measurement of the outlet temperature of a reactor core in a nuclear power station and measurement of the neutron fluence rate of the core and has long service life.

Description

technical field [0001] The invention relates to a core nuclear measuring instrument, in particular to a nuclear measuring instrument integrating a thermocouple and a self-powered neutron detector, which is suitable for measuring the core outlet temperature of a nuclear power plant reactor and the neutron flux rate of the core. Background technique [0002] During the normal operation of a nuclear power plant, the reactor core has high temperature, high pressure, high corrosion and strong radiation. When the reactor is operating at more than 25% of the rated power, the monitoring system inside the core needs to continuously monitor the current reactor safety margin and control the reactivity accordingly. For monitoring the undercooling of the core outlet temperature after an accident, it is necessary to measure the liquid temperature at the core outlet. The life of the core instrument casing assembly is required to be as long as 20 years. In order to reduce the interface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/00G21C17/10G21C17/108G21C17/112
CPCG21C17/00G21C17/10G21C17/108G21C17/112Y02E30/30
Inventor 吴方亮匡洪波卜江涛吴加伦应珠微黄满
Owner 浙江伦特机电有限公司
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