KR101250334B1 - Apparatus and method of vibration measurement for comprehensive vibration assessment of reactor vessel internals - Google Patents

Abstract

PURPOSE: A vibration measuring device and a measuring method for a comprehensive vibration assessment of a nuclear reactor internal structure is provided to minimize influence on a main process for constructing a nuclear plant as the vibration measurement of the nuclear reactor inner structure is performed by installing a vibration measuring sensor during a break-in period after installing the nuclear reactor. CONSTITUTION: A measuring method for a comprehensive vibration assessment of a nuclear reactor internal structure is as follows. A plurality of vibration measuring sensors(24) are installed on the upper head surface, the body circumferential surface, and the lower head surface of a nuclear reactor, respectively. A data acquisition system(20) is arranged outside the nuclear reactor. A vibration measuring cable(25) is connected to the data acquisition system. The data acquisition system receives the data of the vibration measuring sensors. The vibration of an upper guide structure(12), a core support barrel(11), and a lower support structure(13) of the nuclear reactor internal structure are measured. A measurement result is analyzed and evaluated.

Description

Vibration measuring device and measuring method for comprehensive vibration evaluation of reactor internal structure {APPARATUS AND METHOD OF VIBRATION MEASUREMENT FOR COMPREHENSIVE VIBRATION ASSESSMENT OF REACTOR VESSEL INTERNALS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration measuring apparatus and a measuring method for comprehensive vibration evaluation of a reactor internal structure, and more particularly, a core support barrel (CSB), an upper guide structure (UGS) and a lower support. Vibration measuring device and vibration measurement for measuring the vibration of the lower support structure (LSS), but for measuring vibration without changing the design of the reactor internal structure and installing and removing the measurement structure. It is about a method.

Reactor vessel internals (RVI) are subjected to vibrations from the reactor coolant flow under steady and transient operating conditions in the reactor vessel, thus maintaining their integrity throughout the life of the nuclear power plant. In other words, it should be demonstrated in actual reactors that safety margins are secured. To this end, a Comprehensive Vibration Assessment Program (CVAP) is carried out on the reactor internals.

Comprehensive vibration assessment of the reactor internal structure consists of analysis, measurement, and inspection, which are carried out on a reactor hot function test for the reactor pre-core during the commissioning test. It is performed during the functional test (HFT), to check the vibration prediction values in the normal operation and the transient operation state of the reactor calculated from the analysis, and to determine the safety margin for operation for the entire life of 60 years.

In order to design and manufacture the vibration measuring device and the measurement structure for the comprehensive vibration evaluation of the reactor internal structure, the measurement position and the measurement items should be carefully selected in advance. The comprehensive vibration evaluation of the reactor internal structure must compare and evaluate the vibration analysis result and the measurement result. Therefore, the measurement position and the measurement item should be selected based on the analysis result.

In the past, a vibration measuring sensor was attached to the reactor internal structure for comprehensive vibration evaluation of the reactor internal structure, and it was connected to the data acquisition system from the pressure boundary through-hole located at the upper head of the reactor.

However, since the structure inside the reactor is complicated, in order to install the vibration measuring sensor and connect the measurement cable, the structure of the reactor internal structure must be changed, and the measurement structure for installing it on the reactor internal structure is additionally designed, manufactured and installed. There are many problems, such as the need to remove it after measurement.

The present invention provides a vibration measuring device capable of measuring vibrations of a core support barrel (CSB), an upper guide structure (UGS) and a lower support structure (LSS) in a reactor internal structure. It is to provide a vibration measuring method.

In another aspect, the present invention is to provide a vibration measuring device and a vibration measuring method that can measure the vibration without changing the design of the reactor internal structure and the installation and removal of the measurement structure.

The present invention is a vibration measuring method of the internal structure of the reactor, the vibration measuring sensor is installed on the upper head surface, the circumferential surface, and the lower head surface of the reactor, and the data acquisition system is provided outside to install the vibration measuring device outside the reactor. It is characterized by measuring and analyzing the vibration of the core support barrel, the upper guide structure and the lower support structure of the reactor internal structure.

The present invention is a vibration measuring device for measuring the vibration of the core support barrel, the upper guide structure and the lower support structure of the reactor internal structure, the data acquisition system for measuring the vibration of the core support barrel, the upper guide structure and the lower support structure A measurement unit on the upper head of the reactor for installing the outside of the reactor and measuring and transmitting vibration of the reactor to the data acquisition system; A measuring unit on the reactor circumferential surface; A nuclear reactor lower head surface measuring unit is provided, and the upper head surface measuring unit, the circumferential surface measuring unit, and the lower head surface measuring unit of the vibration measuring device include a plurality of ultrasonic sensors.

The vibration measuring device measures the vibration of the core support barrel using the vibration measuring sensor provided on the outer circumferential surface of the reactor, and the vibration measuring device measures the vibration of the upper guide structure using the vibration measuring sensor provided on the upper head surface. can do. In addition, the vibration measuring apparatus may measure the vibration of the lower support structure by using the vibration measuring sensor provided on the lower head surface of the reactor.

The measured values are stored and analyzed in the data acquisition system provided in the reactor, and the structural structure of the reactor internal structure according to the flow-induced vibration (FIV) generated by the core support barrel, the upper guide structure and the lower support structure dp is generated. Health and safety margins can be assessed.

As described above, the present invention includes an upper head plane measuring unit, a circumferential plane measuring unit, and a lower head plane measuring unit of a nuclear reactor, and uses the ultrasonic sensor to induce flow vibration of the core support barrel, the upper guide structure and the lower support structure outside the reactor. The system is configured to measure and store the data in the data acquisition system, and to store and analyze the data.In order to install a vibration measuring instrument or measuring cable inside the reactor for vibration measurement, the structural stress analysis according to the design change and the design change of the reactor internal structure This eliminates the need for additional manufacturing and installation processes, which can significantly reduce the cost of vibration measurement and equipment and vibration evaluation.

In addition, since the vibration measurement of the internal structure of the reactor can be performed by installing the vibration measuring sensor during the preparation period for commissioning after the reactor is manufactured and installed, the effect on the main process of nuclear power plant construction can be minimized.

1 is a block diagram of a vibration measuring apparatus for the overall vibration evaluation of the reactor internal structure according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a vibration measuring apparatus for the overall vibration evaluation of the reactor internal structure according to the present invention.

A data acquisition system 20 is installed outside the reactor 10 to measure and analyze vibrations of the core support barrel 11, the upper guide structure 12, and the lower support structure 13 of the reactor internal structure. An upper head measuring unit connected to the measuring cable 25 to measure the vibration of the 10 and transmitting it to the data acquisition system 20, and having the vibration measuring sensors 24 installed on the upper head of the reactor 10. 21); A circumferential surface measuring unit 22 having vibration measuring sensors 24 installed on a circumferential surface of the reactor 10; A lower head surface measuring unit 23 having vibration measuring sensors 24 installed on a lower head surface of the reactor 10, wherein the upper head surface measuring unit 21, the circumferential surface measuring unit 22, and the lower head surface; The measuring unit 23 is configured by installing an ultrasonic sensor as the vibration measuring sensors 24.

As described above, the present invention provides an ultrasonic sensor as the vibration measuring sensor 24 on the outer surface of the reactor 10, and installs a plurality of vibration measuring sensors 24 on the circumferential surface of the reactor 10 to provide a core support barrel. Measure the vibration.

Then, a plurality of vibration measuring sensors 24 are installed on the upper head surface of the reactor 10 to measure the vibration of the upper guide structure.

In addition, by installing a plurality of vibration measuring sensors 24 on the lower head surface of the reactor 10 can measure the vibration of the lower support structure (13). Here, the vibration measuring sensors 24 of each measuring unit are distributed at regular intervals according to the respective positions, and the measured sensor values are transmitted to the data acquisition system 20 through the measuring cable 25.

Therefore, since the vibration measuring sensors 24 are installed on the outer surface of the reactor 10, the measurement cables 25 can be connected to the data acquisition system 20 from the outside without the influence of the internal structure.

Therefore, since the vibration of the internal structure of the reactor 20 is measured by using the external vibration measuring sensor 24, the measuring cable 25 and the data acquisition system 20, the vibration measuring sensor 24 for the measurement or In order to install the measuring cable 25 inside the reactor, the design change of the reactor internal structure, the stress analysis of the structure according to the design change, and the addition of the manufacturing and installation process are unnecessary.

In addition, after the production and installation of the reactor 10, the vibration measuring device can be installed during the test run preparation period to perform vibration measurement of the reactor internal structure, thereby minimizing the impact on the nuclear power plant construction process.

10: reactor 11: core support barrel
12: upper guide structure 13: lower guide structure
20: data acquisition system 21: upper head surface measuring unit
22: circumferential surface measuring unit 23: lower head surface measuring unit
24: vibration measuring sensor 25: measuring cable

Claims (4)

In the vibration measuring method for the comprehensive vibration evaluation of the reactor internal structure,
A data acquisition system is provided outside the reactor, and a plurality of vibration measuring sensors are provided on the upper head face of the reactor, the circumferential face of the reactor body, and the outer face of the lower head face of the reactor, respectively. Reactor internal vibration, characterized in that for measuring the vibration of the upper guide structure, the core support barrel, the lower support structure of the reactor internal structure by receiving the vibration measurement cable, the data obtained from the vibration measurement sensors from the data acquisition system Vibration measurement method for comprehensive vibration evaluation of structures.
According to claim 1, wherein the vibration measuring sensor,
Vibration measurement method for the comprehensive vibration evaluation of the internal structure of the reactor, characterized by using an ultrasonic sensor.
In the vibration measuring device for the comprehensive vibration evaluation of the reactor internal structure,
An upper head surface measuring unit 21 having vibration measuring sensors 24 installed on the upper head surface of the reactor 10;
A circumferential surface measuring unit 22 having vibration measuring sensors 24 installed on a circumferential surface of the reactor 10;
A lower head surface measuring unit 23 having vibration measuring sensors 24 installed on the lower head surface of the reactor 10;
Measuring and evaluating the vibration of the upper guide structure 12 based on the vibration measurement data of the upper head surface measuring unit 21, and the vibration of the core support barrel based on the vibration measuring data of the circumferential surface measuring unit 22. A data acquisition system 20 installed outside the reactor to measure, analyze, evaluate, and evaluate and analyze the vibration of the lower support structure 13 based on the vibration measurement data of the lower head surface measuring unit 23;
Measurement data of a plurality of vibration measuring sensors respectively installed in the upper head surface measuring unit 21, the circumferential surface measuring unit 22, and the lower head surface measuring unit 23 is transferred to the data acquisition system 20. Vibration measuring device for the comprehensive vibration evaluation of the reactor internal structure, characterized in that it comprises a vibration measuring cable 25 is connected and installed to transmit.
The vibration measuring sensor 24 of claim 3,
Vibration measuring device for the comprehensive vibration evaluation of the internal structure of the reactor, characterized by using an ultrasonic sensor.

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