A subcritical engraved rod method using the source-range detector signal as the signal source

A source-range detector and subcritical technology, which is applied in the field of nuclear reactor physical tests, can solve problems such as poor practicability, high economic cost, and complicated test process, and achieve the effect of saving start-up test time and reducing workload

Active Publication Date: 2022-04-29
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0025] The technical problem to be solved by the present invention is: the test process of the conventional subcritical rod marking method is complicated, the economic cost is relatively high in the implementation process, and the practicability is relatively poor. sub-cutting bar method

Method used

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  • A subcritical engraved rod method using the source-range detector signal as the signal source
  • A subcritical engraved rod method using the source-range detector signal as the signal source
  • A subcritical engraved rod method using the source-range detector signal as the signal source

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Embodiment 1

[0064] This embodiment provides a subcritical engraving rod method using the source range detector signal as a signal source, such as image 3 Shown: In the preparatory stage of the subcritical rod burning test, firstly, through the reference state simulation, using the high-precision steady-state core calculation software that can fully consider the influence of external sources on the neutron flux distribution of the core in the subcritical state, the calculated The limited multiplication coefficient of the core in the reference state, and then obtain the subcriticality of the core in the reference state, and generate key parameters including the fundamental wave distribution, flux distribution and conjugate flux distribution in the reference state; at the same time, each state to be measured can be The core simulation of the core, using the high-precision steady-state core calculation software that can fully consider the influence of external sources on the neutron flux dist...

Embodiment 2

[0086] As shown in Table 1-Table 3, it is an embodiment of the present invention to measure the subcriticality of the core in each rod state in the rod marking test of the subcriticality of a certain group of control rods in a certain reactor.

[0087] Table 1 Source range detector count rate in each state

[0088]

[0089]

[0090] Table 2 Subcritical correction factor libraries prepared for two states to be tested

[0091] core state subcritical correction factor State to be tested 1# 0.4500 State to be tested 2# 0.6085

[0092] Table 3 "Measurement" results of the limited multiplication coefficient of the core in the state to be tested in the subcritical rod-cutting test

[0093]

[0094] Table 1 shows the count rate of the source range detector in each state, including the reference state and two states to be tested.

[0095] Table 2 is the subcritical correction factor library prepared for the two states to be tested in Table 1 befor...

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Abstract

The invention discloses a subcritical rod marking method using the source range detector signal as a signal source. It is a method capable of measuring the value of control rods when the reactor is in a deep subcritical state, and records that a certain control rod group is raised or inserted into the reactor. When the core behind the core is in the state to be tested, the neutron count rate signal of the source range detector is obtained, and the subcritical correction factor is obtained, and the neutron count rate signal of the source range detector is corrected by the subcritical correction factor, and then the corrected signal is used for comparison with The counting rate and reactivity of the range detector in the reference state are compared, and finally the core reactivity in each state to be measured is obtained, and the rod marking is completed, which can effectively reduce the economic cost while ensuring the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor physical test methods, in particular to a subcritical engraving rod method using a source range detector signal as a signal source. Background technique [0002] At present, the mainstream pressurized water reactor nuclear power plant adopts batch refueling method to replace reactor fuel. The core is unloaded, and a corresponding number of new fuel assemblies are loaded into the core at the same time, so that the core has sufficient reactivity to maintain core criticality and energy output. Due to the large difference in the physical properties of the old and new fuels, the reactor must re-design the fuel loading scheme and the related thermal safety analysis. Therefore, before each fuel replacement, nuclear power plants usually need to entrust a design unit with relevant qualifications to design New fuel loading scheme. [0003] After the nuclear power plant completes the fuel loading a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/104G21C17/108G21C17/12
CPCG21C17/12G21C17/108G21C17/104Y02E30/30
Inventor 卢迪彭星杰廖鸿宽李向阳于颖锐王丹蒋朱敏肖鹏刘同先关仲华
Owner NUCLEAR POWER INSTITUTE OF CHINA
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