원자력발전소 콘크리트 구조물은 해안가에 접해 있으며, 해수를 취수하여 냉각수로 사용하기 때문에 염해에 의한 내구성은 매우 중요하다. 이를 위해 3년간의 염해 장기침지시험을 실시하여 염화물이온확산계수의 변화 및 재령계수(m)을 평가한 결과 4,000 Class인 구조물 기초의 m은 0.35~0.39로 KCI나 ACI 제안값과 유사한 결과를 나타내었고 5,000 Class인 필수 냉각수 구조물 및 터널은 0.44~0.53, 6,000 Class인 원자로 격납건물은 0.62로 FIB 제안값과 유사하였다. 실측된 재령계수로 내구수명을 예측한 결과 원전의 모든 안전관련 콘크리트 구조물은 설계수명 60년 이상을 만족하는 것으로 나타났다.

This study was examined the variation of unit water content and fine aggregate ratio in concrete for nuclear power structure using a large amoung of crushed sand.

Concrete structures known that relatively safe for the fire, but the fire damage at different depending on the materials used will be affected, depending on the strength of the concrete damage situation appears different. In this study compared to compressive strength properties acooding to different type of concrete strength fire damege through about concrete structure is utilized as a basis for maintenance.

This study is to compare and analyze the characteristics of blast furnace slag for use in a NPP concrete, strength, drying shrinkage of concrete using fly ash and OPC. Experimental results, the OPC concrete drying shrinkage is the largest and most FA and GS the similar level.

Ground granulated blast furnace slag is known to be much less quality variation compared to the fly ash can be substituted. Have high salt damage resistance, and chemical resistance of concrete with ground granulated blast furnace slag substitution. The case of NPP concrete using fly ash in concrete, and is defined as less than 20% fly ash utilization. In this paper, consider a resistance to freezing-thawing of currently used to concrete in NPP structures and substitutes for ground granulated blast furnace slag