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- W2336407591 abstract "The AP1000 is an advanced passive plant derived from the AP600. The AP1000 and AP600 reactor vessel geometries are basically the same and similar to a standard PWR. The AP1000 is rated for a thermal power of 3400 MWt. A unique feature of these passive plants is that the ECCS is designed to operate through passive means where pumps and emergency diesels are replaced by natural circulation and gravity drain tanks. The passive core cooling system (PCCS) uses four different sources of passive injection during loss of coolant accidents: • Two accumulators provide a very high flow for a limited duration of several minutes • Two core makeup tanks (CMTs) provide a relatively high flow for longer duration. • The in-containment refueling water storage tank (IRWST) provides a lower flow, but for a much longer time. • The containment is the final long-term source of water (natural circulation mode). NRC licensed the Westinghouse Best-Estimate methodology, based on Code Scaling, Applicability, and Uncertainty (CSAU) method for 3- and 4-loop PWRs, in 1996 and 2-loop-UPI PWRs in 1998. This method used response surface functions developed from many WCOBRA/TRAC single parametric sensitivity runs. Westinghouse further developed Automated Statistical Treatment of Uncertainty Method (ASTRUM), which is a new realistic LOCA methodology utilizing a non-parametric statistical sampling technique. This paper presents the result of a realistic LOCA analysis of AP1000 using the new methodology. The result indicates that ASTRUM provides not only a higher margin compared to the current method but also a consistent and straightforward treatment of all high importance uncertainties." @default.
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- W2336407591 date "2004-01-01" @default.
- W2336407591 modified "2023-09-27" @default.
- W2336407591 title "REALISTIC LARGE BREAK LOCA ANALYSIS OF AP1000 WITH ASTRUM" @default.
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