An Assessment of TRACE V4.160 Code Against PACTEL ATWS-10 – 13 and ATWS-20 – 21 Pressurizer Experiments (NUREG/IA-0231)

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Publication Information

Date Published: June 2010

Prepared by:
E. Takasuo

VTT Processes
P.O.B. 1604
02044 VTT
Finland

A. Calvo, NRC Project Manager

Prepared for:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

In this report an assessment of TRACE V4.160 against six pressurizer separate effect tests, namely PACTEL ATWS-10 - 13 and ATWS-20 – 21, is presented. The tests were conducted at the PACTEL test facility as a part of the ATWS test series in 1998 and they consist of four insurge-outsurge transients and two spray transients. A pressurizer model which consists of a 30-node pressurizer component, a surge line, a spray line and a powered heat structure to simulate the pressurizer wall and heaters was used in the simulations. A brief description of the test facility is also given.

The insurge-outsurge test simulation results show a slightly exaggerated peak pressure which may be due to underestimated wall condensation in the insurge. In the simulations in which the effectiveness of spray was studied a relatively good agreement between the simulation results and the experimental results was found.