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- W2189369543 abstract "This paper details the new thermal-hydraulics and shutdown margin calculation modules of Studsvik Scandpower’s next generation nodal code, SIMULATE-4. SIMULATE-4’s BWR thermal-hydraulics (TH) models an entire vessel loop: core, chimney (for natural circulation reactors), upper plenum, standpipes, steam separators, down comer, re-circulation pumps, and lower plenum. The PWR thermal-hydraulics models the region from lower to upper tie plate. The core portion of the TH models of PWR and BWRs are treated essentially identically, with each assembly having an active channel and a number of parallel water channels. In each axial node of a channel, the total mixture mass, steam mass, mixture enthalpy, and mixture momentum balance equations are solved. The 3-D fuel temperatures are evaluated in the TH module by solving the radial heat conduction equation for the average pin of each node. The BWR assembly may be divided into four radial sub-channels. Assembly or nodal cross flow is allowed for PWRs. A new three-dimensional shutdown margin (SDM) method based on “mini-core” concept has been developed in SIMULATE-4. “Mini-core” geometry is used as a fast screening tool where full 3D calculations are performed for those rods identified with SDM smaller than the user’s input criteria. Various numerical test results are presented to illustrate improvements with each module." @default.
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- W2189369543 date "2008-01-01" @default.
- W2189369543 modified "2023-09-23" @default.
- W2189369543 title "SIMULATE-4 developments" @default.
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