新风量对主控室可居留性的影响分析及优化

Abstract

Abstract: Control room habitability (CRH) shall be maintained to provide adequate protection for control room operators, such that they can remain in the control room envelope (CRE) safely for an extended period and thus control the nuclear facility during normal and accident conditions. Among the parameters determining radioactivity in a control room (in proportion to radiation doses of operators), intake flow rate of filtered air is an important one. The evolution of operator doses in a control room versus intake flow rate was analyzed in this paper. It turns out that the increase of intake flow rate results in larger operator doses when inert radioactive gases are the dominant radioactive substances. On the contrary, increasing intake flow rate does good to lower the irradiation level of control room operators when radioactive aerosols dominate the source terms. The rationality behind this fact was interpreted in detail in this paper, with special attention paid to the unfiltered in-leakage rate. It can be inferred that an optimal intake flow rate probably exists leading to the minimum operator dose under an actual accident condition. This paper then conducted a calculation analysis based on design parameters and source terms of design basis accident of LOCA (a large break loss of coolant accident). The evolution of operator dose was found to be a U-curve versus increasing intake flow rate, which proved the existence of the above mentioned optimal intake flow rate of filtered air for CRH systems. Furthermore, the sensitivity analysis of intake flow rate was carried out to study the effects of unfiltered in-leakage rate and filtered recirculation. This study indicates that intake flow rate of filtered air can significantly influence the CRH. To optimize the radiological habitability of control rooms, the effects of unfiltered in-leakage must be taken into consideration. Besides, filtered recirculation is an effective way to control radiation exposure caused by iodine and radioactive aerosols.

Key words: control room, filtered air intake, habitability, unfiltered in-leakage, recirculation

CLC Number:

TL48

WANG Mengxi, LIU Xinjian, QIU Lin. Optimization of filtered air intake flow rate to improve control room habitability[J].RADIATION PROTECTION, 2021, 41(4): 327-334.

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Optimization of filtered air intake flow rate to improve control room habitability

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