Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (4): 40002-040002.doi: 10.11889/j.0253-3219.2020.hjs.43.040002

• SPECIAL SECTION ON THE 11TH NATIONAL CONFERENCE ON NEW AND RESEARCH REACTORS (PART I) • Previous Articles     Next Articles

Research on prevention and detection technology of flow channel blockage accident of plate-type fuel elements

Li DING,Beibei LUO,Xiao HUA,Bo NING,Yaxin QIAO   

  1. China Institute of Atomic Energy, Beijing 102413, China
  • Received:2019-12-21 Revised:2020-02-15 Online:2020-04-15 Published:2020-04-20
  • About author:DING Li, female, born in 1978, graduated from China Institute of Atomic Energy with doctoral degree in 2012, focusing on reactor engineering experiments and application
  • Supported by:
    the Technical support Project on the Administration of Supervision over Safety of Nuclear Facilities for Civilian Use

Abstract: Background

Plate-type fuel element exhibits excellent irradiation properties in research reactor while the grid spacing between the fuel element plates is usually very small. Most of the blockage accidents are caused by foreign matters entering the flow channel or fuel swelling due to the narrow coolant flow channel in the core.

Purpose

This study aims to analyze the process of blockage accidents, and put forward effective preventive measurements and detection methods.

Methods

Based on the investigation of some typical accidents abroad, China advanced research reactor (CARR) was taken as a feature research object, and the thermal hydraulic simulation calculation of CARR core, reactor body, single fuel assembly and cooling circuit outside the reactor was carried out by using the RELAP5/MOD3.2 thermal calculation program. Modeling and analysis of the specific flow channel blockage accident process on CARR was finished.

Results

Simulation results show that the temperature of the fuel assembly in the blocked flow passage will increase when the reactor power is raising, then the coolant will begin to boil, and the power will fluctuate significantly.

Conclusions

It is necessary to strictly control the quality of core operation. The monitoring of neutron flux rate and reactor power, and analyzing fuel temperature are helpful to detect and prevent the further development of the blockage accident.

Key words: Plate-type fuel element, Flow channel blockage accident, China Advanced Research Reactor

CLC Number: 

  • TL385