Matches in SemOpenAlex for { <https://semopenalex.org/work/W2774362385> ?p ?o ?g. }
- W2774362385 endingPage "332" @default.
- W2774362385 startingPage "320" @default.
- W2774362385 abstract "The problems touched on in this work are closely associated with the realization of in-vessel melt retention strategy through the external reactor vessel cooling and cooling of the molten corium pool inside the medium- power reactor VVER-600 (thermal power is ∼1600 MW) in the course of the SA. The general objective of the research was to determine a thermal state in two- and inverse three-layer molten corium pools, which can be formed in the reactor vessel during the SA. The second task was to estimate the efficiency of the top water flooding of corium pool for its cooling in SA by comparing the new results with those obtained in the previous investigation of the authors. Compositions and mass of the corium pools for the two-layer and inverse three-layer pool structures are analyzed and presented in the paper. Simulation of heat transfer in the molten pool was performed for time values 10, 24 and 72 h from the initiating event (IE) in the SA. To estimate the influence of decay heat generation in the bottom metallic layer of the inverse molten pool on the thermal state of molten pool, a series of model SA scenarios was considered in the work. To simplify the simulations the computation domain was bounded by only the pool with taking corresponding boundary conditions. Simulations of thermal state of the molten pool were carried out by means of the NARAL/FEM computer code in which the turbulent convection at the high-Rayleigh numbers was used through the use of the effective heat conduction properties of the corium materials. The numerical results obtained for two-layer corium pool brought out a series of features: (a) the top water flooding of the melt pool resulted in temperature decrease by ∼150 K only in the upper melt steel layer and had no effect on an essential temperature change in the oxide phase of the corium; (b) top flooding of the corium results in an essential decrease (by more than 40%) of maximal values of heat flux acting on the reactor vessel in the region of contact of the vessel wall with steel melt layer. Thus, the top water flooding of the pool surface yields an essential drop of the heat flux peak acting on the vessel wall from 1.65 to ∼1.2 MW/m2 in case at 24 h after IE; (c) the heat flux peaks acting on the vessel decrease from ∼1.65 MW/m2 (at 24 h after IE) to ∼1.15 MW/m2 (at 72 h) in case when the top flooding of the corium pool is absent, and decrease from 1.2 (24 h) to ∼0.6 MW/m2 (at 72 h) when using the top flooding. In the case of the inverse corium pool, the top water flooding essentially decreases (by more than 50%) the maximal value of heat flux in upper layer of steel melt; (d) in the case of melt inversion and redistribution of total decay heat generation in the corium pool between oxide and bottom metallic layers of the pool (parameter KOxide = QOxiide/(QOxiide + QBot_Me), the dependence of maximal values of thermal load on the lateral surface of the pool depending on KOxide value is observed. Thus, the increase of power of heat generation in the bottom metallic layer of the melt from 0.2 to 0.45 (the decrease of. KOxide from 0.8 to 0.55) causes the increase of heat flux value in the bottom layer by ∼1.5 times. Taking into account the fact that in this region of RPV lower head the CHF has low values (∼0.3…0.45 MW/m2), the probability of superheat and premature failure of the vessel bottom in this field increases. The maximal values of heat flux in the oxide phase and bottom heavy metal layer of the pool are observed near the boundary separating these layers. In this region of the VVER lower head, the heat flux attains the values that may exceed the corresponding values of CHF. Because of this, there is a high probability of superheat and the reactor vessel premature failure due to worsened heat transfer and cooling conditions on the external surface of the vessel wall. This fact should be necessarily taken into account when acting on the RPV lower head the thermal loads of moderate intensity (∼0.5…0.7 MW/m2) that may cause superheat and premature failure of the reactor vessel in the case of inverse molten pool formation during the SA in VVERs." @default.
- W2774362385 created "2017-12-22" @default.
- W2774362385 creator A5043954461 @default.
- W2774362385 creator A5057322433 @default.
- W2774362385 creator A5091069900 @default.
- W2774362385 date "2018-01-01" @default.
- W2774362385 modified "2023-10-17" @default.
- W2774362385 title "Features of heat and deformation behavior of a VVER-600 reactor pressure vessel under conditions of inverse stratification of corium pool and worsened external vessel cooling during the severe accident. Part 1. The effect of the inverse melt stratification and in-vessel top cooling of corium pool on the thermal loads acting on VVER-600’s reactor pressure vessel during a severe accident" @default.
- W2774362385 cites W1451334806 @default.
- W2774362385 cites W1951057123 @default.
- W2774362385 cites W1968817267 @default.
- W2774362385 cites W1977812100 @default.
- W2774362385 cites W1980528623 @default.
- W2774362385 cites W1982569356 @default.
- W2774362385 cites W1986829273 @default.
- W2774362385 cites W1988254166 @default.
- W2774362385 cites W1990534976 @default.
- W2774362385 cites W1991204793 @default.
- W2774362385 cites W1991243962 @default.
- W2774362385 cites W1994808498 @default.
- W2774362385 cites W1998839453 @default.
- W2774362385 cites W1999073434 @default.
- W2774362385 cites W2001224270 @default.
- W2774362385 cites W2003299562 @default.
- W2774362385 cites W2003473873 @default.
- W2774362385 cites W2005665927 @default.
- W2774362385 cites W2015965969 @default.
- W2774362385 cites W2023026951 @default.
- W2774362385 cites W2024661887 @default.
- W2774362385 cites W2025889211 @default.
- W2774362385 cites W2027086072 @default.
- W2774362385 cites W2028223921 @default.
- W2774362385 cites W2029119542 @default.
- W2774362385 cites W2029361215 @default.
- W2774362385 cites W2030528403 @default.
- W2774362385 cites W2032388483 @default.
- W2774362385 cites W2037209547 @default.
- W2774362385 cites W2044722526 @default.
- W2774362385 cites W2044897998 @default.
- W2774362385 cites W2046140751 @default.
- W2774362385 cites W2047666340 @default.
- W2774362385 cites W2047915774 @default.
- W2774362385 cites W2049072043 @default.
- W2774362385 cites W2049287038 @default.
- W2774362385 cites W2049703152 @default.
- W2774362385 cites W2052533066 @default.
- W2774362385 cites W2052729206 @default.
- W2774362385 cites W2057443493 @default.
- W2774362385 cites W2062590534 @default.
- W2774362385 cites W2067258664 @default.
- W2774362385 cites W2069631376 @default.
- W2774362385 cites W2071242261 @default.
- W2774362385 cites W2082187655 @default.
- W2774362385 cites W2085789234 @default.
- W2774362385 cites W2086995737 @default.
- W2774362385 cites W2088274648 @default.
- W2774362385 cites W2089711768 @default.
- W2774362385 cites W2124285112 @default.
- W2774362385 cites W2179434100 @default.
- W2774362385 cites W2211460659 @default.
- W2774362385 cites W2286681913 @default.
- W2774362385 cites W2297690450 @default.
- W2774362385 cites W2321284158 @default.
- W2774362385 cites W2325532622 @default.
- W2774362385 cites W2489055030 @default.
- W2774362385 cites W2510125211 @default.
- W2774362385 cites W2511962929 @default.
- W2774362385 cites W2540135045 @default.
- W2774362385 cites W2582709095 @default.
- W2774362385 cites W4239959028 @default.
- W2774362385 doi "https://doi.org/10.1016/j.nucengdes.2017.11.015" @default.
- W2774362385 hasPublicationYear "2018" @default.
- W2774362385 type Work @default.
- W2774362385 sameAs 2774362385 @default.
- W2774362385 citedByCount "5" @default.
- W2774362385 countsByYear W27743623852018 @default.
- W2774362385 countsByYear W27743623852021 @default.
- W2774362385 countsByYear W27743623852022 @default.
- W2774362385 countsByYear W27743623852023 @default.
- W2774362385 crossrefType "journal-article" @default.
- W2774362385 hasAuthorship W2774362385A5043954461 @default.
- W2774362385 hasAuthorship W2774362385A5057322433 @default.
- W2774362385 hasAuthorship W2774362385A5091069900 @default.
- W2774362385 hasConcept C116915560 @default.
- W2774362385 hasConcept C121332964 @default.
- W2774362385 hasConcept C127413603 @default.
- W2774362385 hasConcept C130327135 @default.
- W2774362385 hasConcept C179498184 @default.
- W2774362385 hasConcept C192562407 @default.
- W2774362385 hasConcept C2777769504 @default.
- W2774362385 hasConcept C2779095084 @default.
- W2774362385 hasConcept C2780406361 @default.
- W2774362385 hasConcept C50517652 @default.
- W2774362385 hasConcept C54791560 @default.
- W2774362385 hasConcept C57879066 @default.
- W2774362385 hasConcept C78519656 @default.
- W2774362385 hasConceptScore W2774362385C116915560 @default.
- W2774362385 hasConceptScore W2774362385C121332964 @default.