Nuclear Reactors Containment
Basis of a New Design of Prestressed Reinforced Concret Body for High Pressure Capacities with Improved Reliability
Tech Area / Field
- FIR-OTH/Other/Fission Reactors
8 Project completed
Senior Project Manager
Zalouzhny A A
Georgian Research Institute of Power Engineering and Power Structures, Georgia, Tbilisi
Project summaryAt construction of high pressure capacity bodies great attention is payed to prestressed reinforced concrete with a number of advantages in comparison with metal material (high reliability, higher resistance to seismic loads, impacts from flying objects, etc). However their accomplishment collides with some constructive and technological difficulties (tension of curvilinear heavy steel bundles and ropes, making of curvilinear canals and stretching of bundles there, heavy-dury equipments, etc).
The project envisages working out of construction and technology for the creation of heavity prestressed high pressure capacity bodies with higher safety factors. The goal is reached by following: into the gap between two shells prefilled with bulk material of specific granulation with higher resistance to radioactive irradiation, the solution is injected untill complete saturation of the intergranular space. The stress is brought up to the desired level of compressive prestressing with all loses being taken account of, and is maintained until 70% of concrete design strength.
Higher safety of the given high pressure capacity bodies compared with the existing ones is determined by its peculiarities: clear devision of the main functions - supporting power is provided by outer shells; leakproofness by the metal lined presstressed inner shell; design bar placed in outer shell isn't effected by irradiation and higher temperature; the middle layer from material with high resistence to irradiation several times decreases the possibility of its penetration into inner shell, etc.
Supposed characteristics of the developing high pressure capacity body:
Pressure, MPa: working - up to 4;
maxmum - up to 10;
Seismic stability - force 8.
Temperature, °C: inner zone - up to 400;
allowable for concrete - up to 70°.
Neutron fluence neutron/sm2 - (2…4)ґ1019.
Coefficient of liability - not less 2,5…3.
Thus new "of high pressure capacities" has higher degree of reliability and safety compared with the known constructions.
Aforesaid structure of high pressure capacity body can be used in nuclear reactors of AEPS, gas-holders, high pressure HEPS, pressure water conduits, etc.
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