Numerical study of convective heat transfer between core and steam generator in severe accident with loss of heat removal to secondary side of VVER reactors

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Аннотация

The article discusses the possibility of overheating and failure of heat exchanging tubes in VVER steam generators in the course of severe accidents. The importance of this phenomenon is due to the risk of bypassing the containment by radioactive substances. Natural convection of superheated steam in the hot leg of the main circulation loop is considered as the major mechanism for heat transfer from the core to steam generators. To model convective flows and steam temperature distribution in a system, three-dimensional CFD codes are used. The simulation results demonstrate that the intensity of convective heat transfer from reactor to hot collector of steam generator is insufficient for significant heating and catastrophic degradation of strength of the heat exchange tubes material.

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Авторлар туралы

K. Dolganov

Nuclear Safety Institute of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: dolganov@ibrae.ac.ru
Ресей, Moscow

A. Krutikov

Gidropress Experimental Design Bureau

Email: dolganov@ibrae.ac.ru
Ресей, Podolsk

A. Nikolaeva

Nuclear Safety Institute of the Russian Academy of Sciences

Email: dolganov@ibrae.ac.ru
Ресей, Moscow

Әдебиет тізімі

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1. JATS XML
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2. Fig. 1. Comparison of yield strength and tensile strength of AISI 321 [20] and 08Cr18Ni10T [21] steels as a function of temperature

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3. Fig. 2. Time dependence of the flow rate at the hot string inlet

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4. Fig. 3. Dependence of pressure in the hot string on time

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5. Fig. 4. Geometry with superimposed computational grid

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6. Fig. 5. Current lines in steady-state mode

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7. Fig. 6. Change of steam temperature in the centre of the collector at flow rates at the inlet to the hot string 1 and 2 kg/sec

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8. Fig. 7. Calculated area grid for the STAR CCM+ code

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9. Fig. 8. Temperature in a section of the calculation area (2500 s of calculation)

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10. Fig. 9. Current lines and velocity vector (2500 s calculation)

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11. Fig. 10. Temperature profile along line ‘a’ (2500 s of calculation)

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12. Fig. 11. Temperature profile along line ‘b’ (2500 s of calculation)

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13. Fig. 12. Variation of steam temperature in the centre of the GHG collector in the STAR CCM+ calculation. Green line - OpenFoam calculations, red line - STAR CCM+ calculations assuming ideal gas, blue line - STAR CCM+ calculations using NIST properties, black line - using NIST properties and considering collector metal

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14. Fig. 13. Variation of steam temperature at the centre of the PG collector and PG collector metal temperature in the STAR CCM+ calculation. Blue line - vapour temperature, NIST properties, black line - vapour temperature, NIST properties including collector metal, dashed line - collector metal temperature

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15. Fig. 14. Temperature profile along the line ‘c’ - collector axis (2500 s of calculation)

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