Development of waste packages for the long-term confinement of C-14 in TRU waste disposal :

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  • TRU廃棄物地層処分におけるC-14の長期閉じ込め型パッケージの開発 その１
  • TRU廃棄物地層処分におけるC-14の長期閉じ込め型パッケージの開発(その1)高強度高緻密コンクリート製パッケージの化学的耐久性に関する研究
  • TRU ハイキブツ チソウ ショブン ニ オケル C 14 ノ チョウキ トジコメ ガタ パッケージ ノ カイハツ ソノ 1 コウキョウド コウチミツコンクリートセイ パッケージ ノ カガクテキ タイキュウセイ ニ カンスル ケンキュウ
  • 1. Study on the long-term durability of the concrete package made from high strength and ultra low permeability concrete
  • 高強度高緻密コンクリート製パッケージの化学的耐久性に関する研究

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Abstract

  Water penetration and chemical degradation phenomena of long-term confinement concrete package to reduce the dose rate of C-14 released from hulls and end-pieces were discussed. Long-term confinement concrete package restrains the release of the radionuclides by using the high strength and ultra low permeability concrete (HSULPC) which blocks the contact between the wastes and groundwater. In the previous work, the authors had estimated the water-penetration depth to HSULPC as 14cm for 60000 years by the "water penetration and chemical degradation coupled calculation". This result shows the possibility of the reduction of the influences from C-14 by using HSULPC without placing joints and/or cracks. However, the verification by the long term experiment is necessary to show the conservativeness of the evaluated value.<br>  To obtain such long term data, the authors carried out the water penetration test in the 1MPa and 10MPa water and the leaching experiment to obtain the chemical degradation of HSULPC. The observed progress of the water penetration was lower than that evaluated by Murata's law and micro pore structure didn't change by the 3 years water penetration test. The depth of the Ca dissolution observed by EPMA after 6 months leaching was almost the same as the value calculated from the increase of weight. From these results, the authors reasoned that the evaluation by the "water penetration and chemical degradation coupled calculation" shows the conservative value of the water penetration depth, because the assumption of the calculation was relatively conservative than that of the calculation by Murata's law. presented.

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