To decrease the weight of a shield and reduce the weight of a vessel by suppressing an excessive increase in thickness and density of the shield.SOLUTION: An inspection method for a vessel having a shield for shielding a radiation ray by radioactive waste loaded in a hold includes: a radiation source dose detection step S1 for arranging a radiation source and a detector in a predetermined positional relation and detecting a dose with the detector; a passing dose detection step S3 for arranging the radiation source on a first side of the shield, arranging the detector in a positional relation corresponding to a relative positional relation between the radiation source and the detector in the radiation source dose detection step S1, on a second side of the shield, and detecting a dose; an attenuation factor acquisition step S4 for acquiring a value of a detection value in the passing dose detection step S3 to a detection value in the radiation source dose detection step S1 as an attenuation factor of a radiation ray by the shield; and a determination step S5 for determining whether or not the attenuation factor is equal to or lower than a predetermined threshold.SELECTED DRAWING: Figure 4
【課題】遮蔽体の厚さや密度が必要以上に大きくなることを抑えて、遮蔽体の重量を削減し、船舶の重量を低減する。【解決手段】ホールドに積み込まれる放射性廃棄物による放射線を遮蔽する遮蔽体を有する船舶の検査方法は、放射線源及び検出器を予め定めた位置関係で配置し、検出器で線量を検出する線源線量検出工程S1と、遮蔽体の第一側に放射線源を配置するとともに、遮蔽体の第二側に、線源線量検出工程S1における放射線源と検出器との相対位置関係に対応する位置関係となるように検出器を配置し、線量を検出する通過線量検出工程S3と、線源線量検出工程S1での検出値に対する通過線量検出工程S3での検出値の値を、遮蔽体による放射線の減衰率として取得する減衰率取得工程S4と、減衰率が予め定めた閾値以下か否かを判定する判定工程S5と、を含む。【選択図】図4
VESSEL INSPECTION METHOD, VESSEL DESIGN METHOD, VESSEL MANUFACTURING METHOD
船舶の検査方法、船舶の設計方法、船舶の製造方法
2019-08-01
Patent
Electronic Resource
Japanese
IPC: | B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS |
VESSEL INSPECTION METHOD AND VESSEL MANUFACTURING METHOD
European Patent Office | 2019
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