Abstract
After the successful construction and operation experience of the 10 MW high-temperature gas-cooled reactor (HTR-10), a high-temperature gas-cooled pebble-bed modular (HTR-PM) demonstration plant is under construction in Shidao Bay, Rongcheng City, Shandong province, China. An online gross γ monitoring instrument has been designed and placed at the exit of the helium purification system (HPS) of HTR-PM and is used to detect the activity concentration in the primary circuit after purification. The source terms in the primary loop of HTR-PM and the helium purification process were described. The detailed configuration of the gross γ monitoring instrument was presented in detail. The Monte Carlo method was used to simulate the detection efficiency of the monitoring system. Since the actual source terms in the primary loop of HTR-PM may be different than the current design values, a sensitivity analysis of the detection efficiency was implemented based on different relative proportions of the nuclides. The accuracy and resolution of the NaI(Tl) detector were discussed as well.
Highlights
Generation IV nuclear energy systems were introduced 16 years ago
Based on the successful operation of HTR-10, the construction of the hightemperature gas-cooled pebble-bed modular (HTR-PM) demonstration plant started at the end of 2012 to verify the technologies and to confirm the feasibility and reliability of modularized reactors, which are crucial steps to demonstrate whether HTRs can economically compete against light water reactors (LWRs)
We focused on researching the design scheme and detection principle of the online gross γ monitoring instrument with a low detection range at the exit of the helium purification system (HPS)
Summary
Generation IV nuclear energy systems were introduced 16 years ago. The very-high-temperature reactor (VHTR), as an advanced type of the high-temperature gas-cooled reactors (HTGRs), is one of the six Generation IV nuclear energy systems. Based on the successful operation of HTR-10, the construction of the hightemperature gas-cooled pebble-bed modular (HTR-PM) demonstration plant started at the end of 2012 to verify the technologies and to confirm the feasibility and reliability of modularized reactors, which are crucial steps to demonstrate whether HTRs can economically compete against light water reactors (LWRs). Both HTR-10 and HTR-PM use helium as the coolant and graphite as moderator. The improvement of the current design scheme was discussed
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