4. METHOD OF SOLUTION
Measurements have been formatted and stored to facilitate computer application. The storage format for each fuel rod entry provides identification data, design parameters, power history, and corresponding measurement history. The verification data base is expanded prior to evaluating each new version of the model to enable verification runs to have continuing independent benchmark significance because there is always the chance that empiricism in the model based on previous experiments may be mis- directed.
The storage structure is made up of 11 separate file types, 10 of these corresponding to different card types and associated card formats. The identification and design block includes the first four card types: types 1, 2, and 3 appear for each entry. Card type 1 provides the rod designation and run number and experiment and reference report designation. Type 2 contains data availability flags for the 15 measurement parameters which follow and specifies the number of measurement locations. Type 3 represents the main design, fabrication, and system condition data. If local measurements are available, card type 4 gives the instrument location. Card types 5 and 6 describe the rod operation history. Type 5 specifies the heat rating and cumulative irradiation time at the end of an operating step and the associated step power and burnup condition measurements. Type 6 describes normalized axial power distributions during different operation history periods. The rod measurement history is defined by card types 7 through 11. Types 7 and 8 contain instrumented rod measurements corresponding to operating steps defined by card types 5 (e.g., integral measurements for fuel and cladding length change, rod internal pressure, fuel and cladding temperature, cladding circumferential strain, and gap conductance at specified instrument locations). Card types 9, 10, and 11 are used for post-irradiation exam (PIE) measurements. Types 9 and 10 contain integral measurements related to gas, void, pressure, and axial deformation conditions. Card type 11 represents PIE measurements for melt radius, corrosion thickness, permanent hoop strain, and gap conductance from grain growth determination.