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本文参照当前国内外常用导则给出的估算事故扩散因子的模式 ,提出了一套估算事故冲洗因子的确定论模式与概率论模式 ,并根据我国东部某待建滨海核电厂址的实测气象资料 ,分别估算了事故后各时段 (0～ 8h、8～ 2 4 h、1～ 4 d和 4～ 30 d)的冲洗因子 (确定论模式 )和事故概率冲洗因子以及相应的沉积外照射剂量。结果表明 ,对事故后 0～ 8h时段而言 ,由确定论模式给出的冲洗沉积外照射有效剂量分别为相应的干沉积外照射有效剂量和总有效剂量 (未包括冲洗沉积 )的 55%和 2 2 % ;而由概率论模式给出的上述比值分别为 5.7和 2 .3倍。由此可见 ,对该滨海核电厂址应该考虑冲洗沉积外照射剂量的贡献。
In this paper, a set of deterministic and probabilistic models for estimating accidental flushing factors are proposed by reference to the current models for estimating incident diffusion factors, and based on the measured meteorological data of a pending coastal nuclear power plant site in eastern China, The rinsing factors (deterministic mode) and probability of accidental rinsing factors and the corresponding depositional external exposure dose were estimated for each time period after the accident (0 ~ 8h, 8 ~ 24 h, 1 ~ 4 d and 4 ~ 30 d) The results show that for the period from 0 to 8 hours after the accident, the effective dosages of external exposure to rinse deposition given by deterministic model are respectively 55% of the corresponding effective dose of dry-deposition external irradiation and total effective dose (excluding rinse deposition) 2 2%, while the above ratios given by the probability model are 5.7 and 2.3 times respectively. It can be seen from this that the contribution of flushing external exposure dose to sedimentation should be taken into consideration for this nuclear power plant.