44 Deliberation Deliberation No. 3 February 6, Showa 44

Regarding the release of radioactive liquid waste from the reprocessing facility etc.About thinking on prevention of disability (report)

44 Deliberation Deliberation No. 3February 6, Showa 44

    Prime Minister Eisaku Sato
Chairman of the Radiation CouncilKenjiro Kimura
Regarding the release of radioactive liquid waste from the reprocessing facility etc.About thinking on prevention of disability (report)
Regarding the mark which had been consulted with this council on March 19, 1943 under the original number 1206, we deliberated deliberations at the special watershed release subcommittee, but in the case of the meeting held on February 6, 1964 We got the conclusion at the 23rd Radiation Council General Assembly as follows and we will respond.
Record
Ⅰ Basic attitude in deliberation
The Radiation Council believes that the basis for protecting citizens from radiation hazards in promoting peaceful uses of nuclear energy is to respect the recommendations of the International Radiological Protection Committee.The Council deliberated on the following basic attitude.

1 Exposure doseRegarding the radiation dose of citizens, even if we take into account all the exposures (excluding radiation for receiving medical treatment and radiation from natural radiation) that every single citizen receives in daily life as much as possible It should not exceed the dose limit for the public members as recommended by the International Radiological Protection Committee.
2 On internal and external radiation exposureFor low-level radioactive liquid waste (Note 1) released into the sea area, internal radiation exposure caused by ingestion of radioactive material in the waste liquid by people through seafood foods and external radiation directly received by humans in the area or in the surrounding area Should be considered.
3 About the target groupWith regard to the radiation set forth in the preceding paragraph, in order to ensure the safety of all citizens, consideration should be given to a group considered to have the largest radiation dose.
4 About target facilitiesWe will mainly consider reprocessing facilities, but we think that the way of thinking that results from deliberations basically applies to all nuclear facilities. In applying the concrete application, please respect the spirit of the recommendation of the International Radiological Protection Committee and take into consideration all the conditions such as the type of facility and the situation of the environment, so as to minimize the radiation dose as much as possible Should.

Ⅱ Results of deliberation
Traditionally, in order to protect citizens from radiation damage in Japan, we respect the spirit of the recommendation of the International Radiological Protection Committee and basically reduce the radiation exposure as much as possible. For occupants, the recommended maximum allowable dose We have taken legal restrictions so that it does not exceed, and we have taken sufficient measures not to exceed the dose limit for the public members indicated in the recommendation for the general public.This principle must also be observed with respect to the radiation dose when low-level radioactive liquid waste generated from reprocessing facilities etc. is released into the sea area.Therefore, the idea concerning the prevention of damage related to the release of low-level radioactive liquid waste in the sea is as follows.

1 Specificity of exposure due to sea emissionHuman radiation exposure due to the release of low-level radioactive waste into the ocean is partly due to internal exposure from radioactive substances ingested by humans via marine products produced from the sea area. In this case, consideration should be given to the in vivo concentration of radioactive materials by marine organisms and the attachment of radioactive substances to the surface of marine products.On the other hand, there are external exposures that fishermen, beaches etc. may receive from fishing gear or beach etc.Therefore, for radiation exposure of people due to ocean emission of low level radioactive waste liquid, these two types of radiation exposure must be examined comprehensively.
2 Estimated exposure doseConsideration to minimize the exposure dose of people caused by release of low level radioactive liquid waste into the ocean, including radiation exposure due to other causes (excluding exposure to radiation treatment and exposure to natural radiation) Do not exceed the dose limit for the members of the public as recommended by the International Radiation Protection Committee.Therefore, the radiation dosage as a measure of human exposure dose resulting from the release of low-level radioactive liquid waste should be taken considerably lower than this dose limit. This value depends on the type of facility and the situation of the environment Depending on the specific factors of the situation, it must be properly set. (Note 2)
3 Management of marine environmentIn releasing the low-level radioactive liquid waste in the ocean area, depending on the quality and quantity of the waste liquid, follow the process until the radioactive substance in the waste solution touches the person and take into consideration the above-mentioned various factors concerning the radiation, The maritime environment must be properly managed.
4 Release of radioactive waste liquidWhen estimating the amount of radioactive material that can be emitted over a certain period of time based on human exposure dose, factors related to the aforementioned radiation exposure must be taken into account. Regarding the values ​​of these factors, if surveys of the relevant sea area and other necessary surveys are carried out according to the type of facility and the quality and quantity of waste liquid, etc., and comprehensively examined, unless the results are not set to be on the safe side It will not.
5 Emission from multiple facilitiesWhen multiple facilities are installed or expected to be installed in the same area, keep in mind that there is an additive effect of the released radioactive liquid waste, so that the above-mentioned idea is applied as a whole to the individual seawater For institutions the release of low level radioactive waste should be limited.
Radioactivity monitoring and evaluation in 6 areasFor releasing the low-level radioactive liquid waste in the sea, concentrations of radioactive substances such as sea water and necessary marine organisms in the relevant sea area are periodically measured according to the type of facility and the quality and quantity of waste liquid, and the radioactivity level of the environment Must be monitored. In addition, an authoritative organization for evaluating the results fairly must be prepared in advance.The results of the measurement and evaluation described above, together with the progress of research on environmental radioactivity in the sea area, should be utilized as important material for releasing future low-level radioactive liquid waste.The above idea is the basis for protecting the public against radiation hazards in response to the release of radioactive liquid waste in the sea.

    (Note 1) At the report of the Special Committee on Waste Treatment of the Atomic Energy Commission (September 12, 1967), low level is set at 10 -3 to 10 - 6 μCi / cm 3 as a classification for treatment. The Council discussed the following considering the low level radioactive liquid waste to be less than about 10-3 μCi / cm 3 and considering the equivalent treatment in consideration of human exposure.

    (Note 2) In order to respond to the immediate needs, we discussed deliberately the values ​​that should serve as an indication of the radiation dose for reprocessing facilities. As a result, I think that it is appropriate to set this value to 1/10 of the dose limit for the public members for the time being.