With regard to an inland nuclear power plant bordered by a reservoir, a major concern was that fresh water might be polluted and the human body might be radiation exposed due to the discharge of liquid radioactive effluents. In contrast to other radionuclides in the effluents, tritium has specific dispersion behavior in the aquatic environment such as emission into the air along with water evaporation. Further, the evaporated tritium in the air could go toward the territorial system where the wind blows. As a result, the person staying in the vicinity of the plant discharge point would be exposed with an additional radiation dose. In light of this characteristic, this study first introduced this new exposure pathway and investigated the additional radiation dose on the basis of a hypothetical reservoir. The results indicated that annual tritium evaporation fraction is approximately 2.5%, which is a comparable level with the radioactive decay factor. This would produce an additional radiation dose of 0.63 μSv/a to a person staying 50 m away from the plant discharge point for the case of 1 g/a tritium discharge. Tritium evaporation effects could be decreased through controlling the discharge depth. Thus, a preliminary suggestion to adopt a deep discharge instead of surface discharge was proposed from the ALARA (as low as reasonably achievable) criterion of radiation protection.

对于毗邻水库的内陆核电站，主要关注的是淡水可能受到污染，人体可能会因排放液态放射性废水而受到辐射。与流出物中的其他放射性核素相比，氚在水生环境中具有特定的分散行为，例如随着水蒸发排放到空气中。此外，空气中蒸发的氚可能会流向风所吹动的领土系统。结果，留在工厂排放点附近的人将受到额外的辐射剂量。鉴于这一特点，本研究首先引入了这种新的暴露途径，并在假设的蓄水池的基础上研究了额外的辐射剂量。结果表明，每年氚蒸发率约为2.5%，与放射性衰变因子相当。在 1 g/a 氚排放的情况下，这会对距离工厂排放点 50 m 的人产生 0.63 μSv/a 的额外辐射剂量。通过控制放电深度可以降低氚蒸发效果。因此，从辐射防护的 ALARA（尽可能低）标准中提出了采用深度放电代替表面放电的初步建议。通过控制放电深度可以降低氚蒸发效果。因此，从辐射防护的 ALARA（尽可能低）标准中提出了采用深度放电代替表面放电的初步建议。通过控制放电深度可以降低氚蒸发效果。因此，从辐射防护的 ALARA（尽可能低）标准中提出了采用深度放电代替表面放电的初步建议。