Verification Of Thermal-Hydraulic Design Of PWR Core 1000 MWe Class

VERIFICATION OF THERMAL-HYDRAULIC DESIGN OF PWR CORE 1000 MWe CLASS.

Muh. Darwis Isnaini dan Pudjijanto MS
PTRKN � BATAN, Kawasan Puspiptek Gd.80 Serpong, Tangerang, 15310
ABSTRACT
VERIFICATION OF THERMAL-HYDRAULIC DESIGN OF PWR CORE 1000 MWe CLASS. Verification of thermal-hydraulics design of PWR core 1000 MWe class (reactor power of 900 � 1,100 MWe) was carried out. The reasoning of this research is, the decision of nuclear power plant (NPP) type has not been selected yet, because there were not enough technical data about any kinds of NPP�s characteristics owned. Therefore, a verification was carried out, constraint for PWR type only, by the objective, comparing the PWR�s thermal-hydraulic characteristics, in order that the result be usable as opinion input in deciding what NPP�s type will be selected. Verifications were carried out for two types of PWR, i.e., PWR 2nd Generation (PWR G2) made by Mitsubishi that contains of 157 fuel element assemblies for 2,660 MWt and Typical PWR that made by Westinghouse that contains of 193 fuel element assemblies for 3,411 MWt. The calculations were performed using THAL program (Thermal- Hydraulics Assigned for LWR) in which the program is useful for thermal-hydraulics calculation in light water typed reactor of BWR or PWR. The program is capable of calculation of one fuel rod or one fuel assembly or one core in time. For reactor power of 2,660 MWt with flow rate of 45,400 ton/h and inlet temperature of 288 �C, the verification result of Mitsubishi PWR G2 design shows that outlet temperature is 340 �C (different is 4.62%), maximum cladding temperature and meat temperature are 360.71oC and 1,943.83oC, and the safety margin for DNBR is 2.15. Whereas the verification result for Westinghouse Typical PWR design for reactor power of 3,411 MWt with flowrate 60,000 ton/h and inlet temperature 292.6oC shows that the outlet temperature is 344.7oC, the maximum cladding and meat temperature are 372.17 �C and 2,036.06 �C, and safety margin for DNBR is 1.45. Referring to the maximum meat temperature limit is 2,594 �C to avoid fuel melting and safety margin for DNBR is 1.24, both PWR typed nuclear power plant can be operated safely. Even the calculation used global inputs of one fuel assembly, the program results axial temperature distribution for coolant, cladding, and fuel meat including safety margin of DNBR as well.

Keywords: Thermal-hydraulics design, PWR 2nd Generation, PWR Typical.
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