MHWRR在极低光激中子水平下的临界启动技术

doi:10.11889/j.0253-3219.2020.hjs.43.060602

Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (6): 60602-060602.doi: 10.11889/j.0253-3219.2020.hjs.43.060602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles Next Articles

The criticality startup techniques for MHWRR under low photoneutron level conditions

li DING,Pengcheng XU,Xiao HUA,Jianxiao ZHEN,Yanyan GE

China Institute of Atomic Energy, Beijing 102413, China

Received:2020-02-13 Revised:2020-02-28 Online:2020-06-15 Published:2020-06-12
About author:Ding Li, female, born in 1978, graduated from China Institute of Atomic Energy with a doctoral degree in 2012, focusing on reactor engineering experiments and application

Abstract

Abstract: Background

The Multi-purposes heavy water research reactor (MHWRR) at the Birine Nuclear Research Center in Algeria had been upgraded. Its instrumentation, control and electrical system had been upgraded and fission molybdenum radiation apparatus were installed in the reactor core. First critical startup at very low photoneutron level after MHWRR upgrade is of great significance to the reactor modernization, marking the completion of the upgrading project.

Purpose

This study aims to fulfill successful critical startup of the reactor without additional neutron source, solve the problem of nuclear measurement blind area, and ensure the startup safety of the MHWRR after long period shutdown.

Methods

Based on the theoretical calculation and analysis of the residual photoneutron source intensity, the nuclear measurement blind area and the critical control rod height, a critical startup experiment scheme was put forward. The experiment was carried out in full accordance with the expectation of theoretical design in the absence of reference data, and nuclear power parameters were effectively monitored.

Results

The measuring data range of startup monitoring devices are well connected with the original monitoring ionization chambers outside the reactor core, and the error between theoretical value of critical control rods position and experimental value is less than 0.84%.

Conclusions

Successful critical startup and the agreement between the experimental results and the theoretical results show that the experiment technique for critical startup of MHWRR is reasonable and feasible.

Key words: MHWRR, Photoneutron, Criticality startup

CLC Number:

TL374

li DING, Pengcheng XU, Xiao HUA, Jianxiao ZHEN, Yanyan GE. The criticality startup techniques for MHWRR under low photoneutron level conditions[J].Nuclear Techniques, 2020, 43(6): 60602-060602.

Figures/Tables 9

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References 8

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分组Group	1	2	3	4	5	6	7	8	9
衰变常数Decay constant / s^-1	2.77×10^-1	1.69×10^-2	4.81×10^-3	1.50×10^-3	4.28×10^-4	1.16×10^-4	4.39×10^-4	3.65×10^-4	6.30×10^-5
产额Yield / %	4.512×10^-1	1.414×10^-1	4.855×10^-3	2.326×10^-3	1.428×10^-3	1.612×10^-3	2.21×10^-4	7.1×10^-5	3.6×10^-5

能群Group	1	2	3	4	5	6
能量Energy / MeV	2.225~3.0	3.0~4.0	4.0~5.0	5.0~6.5	6.5~8.0	>8.0
光子强度Photon intensity / s	1.46×10¹⁰	1.22×10⁹	1.80×10³	7.16×10²	1.39×10²	2.93×10¹

	时刻Time
	17:30	17:40	17:45
反应堆状态 Reactor status	次临界 Subcritical	逼近临界 Approach to criticality	超临界过渡 Supercritical transition
启动装置1 No.1 starting device	1.00×10^-8	3.00×10^-8	2.45×10^-7
启动装置2 No.2 starting device	6.00×10^-9	1.82×10^-8	1.40×10^-7
功率调节1 No.1 power regulation device	3.43×10^-11	6.35×10^-11	4.75×10^-10
功率调节2 No.2 power regulation device	2.66×10^-11	9.41×10^-11	6.56×10^-10
核功率显示 Power display device	4.66×10^-11	1.50×10^-10	4.01×10^-9
功率保护1 No.1 power protection device	5.40×10^-11	1.86×10^-10	1.42×10^-9
功率保护2 No.2 power protection device	6.00×10^-11	2.07×10^-10	1.50×10^-9
功率保护3 No.3 power protection device	4.10×10^-11	1.30×10^-10	1.10×10^-9

The criticality startup techniques for MHWRR under low photoneutron level conditions

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