Method for improving rating steady-state operation power of homogeneous water solution nuclear reactor

Abstract

The invention provides a method for improving the rated stable operation power of uniformity solution nuclear reactor, which is characterized in that a flat reactor core with the ratio of height and the diameter less than 0.5 is adopted to enlarge the surface area of reactor core fuel solution, to reduce the vacuolar coefficient of fuel solution, to control the surface releasing ratio of radiantly decomposed gas: hydrogen and oxygen and to control the reactor core specific power; ruthenium iron ions are added in reactor fuel solution and a device which converts nitrogen generated by the radiation and decomposition of HNO3 into HNO3 and an automatic continuous HNO3 supplementation system are additionally added, so as to enlarge the surface area of a heat exchanger, the gas circuit flux of nuclear reactor and hydrogen and oxygen composition capability of a hydrogen and oxygen compositor in the gas circuit, and to control the hydrogen consistency in the gas circuit. The method of the invention can ensure that the rated stable operation power of the uniformity solution nuclear reactor is higher than 200kW.

Description

technical field [0001] The invention belongs to a design method of a nuclear reactor, in particular to a method for increasing the rated steady-state operating power of a homogeneous aqueous solution nuclear reactor. Background technique [0002] One of the main uses of the current homogeneous aqueous solution nuclear reactor is to produce medical isotopes. Uniformity Aqueous Solution for Nuclear Reactors to UO 2 SO 4 Solution or UO 2 (NO 3 ) 2 The solution is nuclear fuel, and its steady-state operating power is low. As a homogeneous aqueous solution nuclear reactor for research, UO is mainly used 2 SO 4 The solution is used as nuclear fuel, and the steady-state operating power is more than 50kW, and the highest design steady-state operating power is 100kW, but the long-term steady-state operation has not been realized. to UO 2 (NO 3 ) 2 The homogeneous aqueous solution nuclear reactor with solution as nuclear fuel has a rated steady-state operating power of 25kW...

AI Technical Summary

Problems solved by technology

[0007] 1. Since the ratio of core height to diameter is about 0.7-1.0, the surface area of ​​fuel solution is small (0.05-0.10m 2 ), the radiolysis gas in the fuel solution (O 2 Gas and H 2 Gas) is not easy to escape, so that the cavitation coefficient of the reactor fuel solution is large (1.5-3.0%), and the surface release rate of radiolysis gas is high (4.5-7.8L / m 2 s), when operating at a higher power, a large amount of radiolysis gas is produced, which increases the cavitation coefficient of the fuel solution, increases the gas release rate on the surface of the fuel solution, and causes a large amount of radiolysis gas to escape from the surface of the fuel solution, causing the surface of the fuel solution to Large fluctuations lead to large fluctuations in the operating power of the reactor, making it difficult for the reactor to achieve steady-state operation

[0008] 2. Due to the small volume of the core fuel solution, if the operating power is increased, the volume of the reactor will be higher than the power, resulting in the radiolysis product H in the fuel solution 2 o 2 High concentrations will cause UO 4 Precipitation; with UO 2 (NO 3 ) 2 The solution is HNO in the fuel solution of nuclear fuel 3 The increase in the amount of decomposition will cause the pH value of the fuel solution to drop rapidly. If the acid is not replenished in time, it will cause UO 2 +2 Hydrolysis and precipitation will eventually cause the fuel solution to be uneven and stable, making the reactor unable to operate in a steady state

[0009] 3. Due to the small volume of the homogeneous aqueous solution nuclear reactor, the volume of the core fuel solution is small (11.5-26L), and the heat exchange area of ​​the coil heat exchanger is small (2 ), cannot take away more nuclear fission energy, under normal pressure, cause the core fuel solution to boil, so that the reactor steady-state operating power cannot be further improved, when the reactor operates at a power higher than 50KW, the fuel solution will boil and become cause the reactor to shut down

[0010] 4. Due to the high steady-state operating power of the reactor, the amount of hydrogen and oxygen produced by radiation decomposition is large, while the gas circuit is small in volume and flow rate, and the hydrogen-oxygen recombiner has a small ability to recombine hydrogen and oxygen, which cannot effectively recombine the large amount of hydrogen generated during high-power operation of the reactor. Hydrogen may cause hydrogen deflagration, directly endangering the operation safety of the reactor, thus limiting the steady-state operating power of the reactor

[0011] The above defects of the current homogeneous aqueous nuclear reactor make its rated steady-state operating power low (≤50kW), which limits its application and cannot be used for large-scale production of medical isotopes