Defects and Repair - Concrete Structures in Nuclear

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Extra resources for Defects and Repair - Concrete Structures in Nuclear Powerplants Vol 2 (csni-r2002-7-vol2)

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Thus it will be necessary to monitor structures in order to identify their “normal engineering behaviour”. In-service Performance A number of the two-instrument external instrument packages have been installed on actual NPP structures and these are giving very good results with levels of noise and accuracy comparable with the laboratory tests. References 1. cz Abstract The contribution presents some aspects of the static reliability of concrete structures under temperature effects and under mechanical loading.

Application of the non-linear modelling is another sphere of the result accuracy specification. 60 NEA/CSNI/R(2002)7/VOL2 In regard to the extreme loading (mechanical, temperature, moisture and radiation), owing to importance of the concrete structures and in view of extremely high demands on the reliability (that must be regularly controlled during the nuclear power plant operation and even after its closing as well), there appears as the only possibility of the experimental monitoring combination of important properties of a concrete structure with numerical verifying of the structure actual reliability by the help of mathematical modelling (with regard to the actual physically-mechanical characteristics) in the future.

1. 1. Radiation loading The detailed analysis of the radiation influence on the concrete structures reliability was carried out detailed theoretical summary can be found in [4], [5]. 41985 [6] the radiation influence on the primary shielding is minimal on the condition that the density of the temperature flow of energy does not exceed 1010 MeV . cm-2 . s-1= 16 W m2. According to our carried out calculations, the density of the temperature flow of energy at the primary concrete shielding entry is 714 times lower than the value considered by the USA standard.

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