Analysis and Practice of Dissolved Hydrogen Control Methods in the Primary Circuit of Sanmen Nuclear Power Plant
The AP1000 unit adopts a passive design concept,applying new technologies such as shielded main pumps,non depressurization of purification systems,direct high-pressure hydrogenation,and elimination of low-pressure volume control boxes,simplifying system layout and operation,but posing new challenges to the control of dissolved hydrogen in the primary circuit.By analyzing the distribution and change mechanism of hydrogen in the primary circuit and the pressurizer,the influence of pressurizer spray and steam generator heat transfer tube penetration on dissolved hydrogen was elaborated.The variation patterns of dissolved hydrogen during startup,power operation,minor repairs,and major repairs in Sanmen Nuclear Power Plant were summarized,and dissolved hydrogen control methods were developed and implemented.
Dissolved hydrogenPressurizer spraySteam generator heat transfer tube penetration
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