With more than 30 years of extensive nuclear steam supply system (NSSS) non-loss-of coolant accident (LOCA) safety analysis experience, Westinghouse is at the forefront of developing and maintaining state-of-theart methods. Westinghouse now offers a non-LOCA safety analysis methodology and technical transfer package that incorporates the RETRAN-02 computer code with Westinghouse software (FACTRAN, TWINKLE, OPTOAX), along with a set of analysis methods approved by the U.S. Nuclear Regulatory Commission (NRC).
The Westinghouse non-LOCA technology transfer includes the following code packages:
RETRAN-02 is the reactor coolant system (RCS) transient analysis computer code maintained by Computer Simulation & Analysis Inc. (CSA) for the Electrical Power Research Institute (EPRI). It has point kinetics capability as well as the ability to model twophase flow and detailed steam generator geometry. The NRC has reviewed and approved non-LOCA safety analysis methods that use Westinghouse’s RETRAN model.
FACTRAN is a digital computer code that calculates the transient temperature distribution in a cross section of a metal-clad UO2 fuel rod and the transient heat flux at the surface of the clad, using the nuclear power and time-dependent coolant parameters (pressure, flow, temperature and density) as input.
The OPTOAX code is used to calculate overtemperature delta-T and overpower delta-T reactor trip setpoints.
TWINKLE is a multidimensional, spatial neutron kinetics digital computer code patterned after steadystate codes presently used for reactor core design.
IGOR is an input preprocessor designed specifically for use with a Westinghouse-developed RETRAN plant model. IGOR automates the development of a plantspecific, steady-state RETRAN input file and reduces the effort required to make RETRAN input modifications.
XTRACTR is a Westinghouse-developed post-processor for the RETRAN code that has the capability to:
The Westinghouse NSAPLOT explores large amounts of data in the form of x-y plots. NSAPLOT supports many common output devices, including X11 Windows and postscript.
The benefits of this technology transfer include:
The deliverables for a typical non-LOCA technology
transfer suite include:
The following plants, utilities and companies havelicensed a Westinghouse non-LOCA technologytransfer package: