Maximum cladding surface temperature

The location of maximum clad surface temperature, z, can be determined by the condition... 

Maximum cladding surface temperature of core fuel pin... 

Plant Maximum cladding surface temperature of core fuel pin (°C) Fission product gas volume per pin (cm ) ... 

Subchannel analysis models have been investigated for CSRIOOOEA by using the experimental data available and the computational fluid dynamics (CFD) code (Du et al., 2013). The analysis results are used to improve a subchannel code. The steady-state subchannel analysis is conducted on the CSRIOOO FA to obtain the temperature distribution of coolant and cladding and pressure drop in the FA. The results show that smaller pitch will flatten the profile of the coolant temperature and reduce maximum cladding surface temperatures, but it increases the pressure drop in the assembly. 

Maximum cladding surface temperature at rated power 650°C for Stainless Steel cladding... 

Maximum cladding surface temperature must be the same as the rated power limit. 

Maximum cladding surface temperature (°C) Maximum allowable power (%Po)... 

Fig. 1.37 Maximum cladding surface temperature criteria and margins for abnormal transients and accidents...

Table 1.16 Maximum cladding surface temperatures predictions by diffta-ent heat transfer correlations (in °C)...

The maximum cladding surface temperature of the fuel rod is assumed to be 740°C from the BOL to the EOL of the fuel rod. The fuel rod is axially divided into segments (from segment number 1 at the bottom to segment number 10 at the top). The axial cladding surface temperature profile of the fuel rod is assumed to be as described by Fig. 2.97 [34]. 

In the Super LWR, a design criterion is set on the maximum cladding surface temperature (MCST) in order to maintain fuel rod integrity and prevent cladding failures. MCST is limited to not greater than 620°C as an example for the following discussion [9]. 

Maximum cladding surface temperature Thermal-hydraulic stability... 

Fig. 5.78 Maximum cladding surface temperatures during system pressurization and line switching...

The plant transient analysis code SPRAT-DOWN, described in Sect. 4.2, is extended for the analyses of abnormal transients and accidents. The calculation model is shown in Fig. 6.12. The models of the equipment, i.e., the AFS, SRV, MSIVs, and turbine bypass valves, are added for safety analyses. A hot chaimel, where the linear heat generation late and maximum cladding surface temperature are the highest in the core, is modeled as well as the average channel in order to calculate the highest values of cladding temperature and pellet enthalpy. The flow chart is shown in Fig. 6.13. 

Bold characters reference case, AMCST increase in maximum cladding surface temperature... 

The time profiles of the increase in the maximum cladding surface temperature (AMCST) are shown in Fig. 6.64. The peak values of Cases 1 and 2 are almost equal to that calculated by the single channel code while that of Case 3 is higher than the result by the single channel code by about 25°C. 

Nominal value of the maximum cladding surface temperature (MCST) is less than 650°C. 

The peak values of the cladding surface temperatures in each seed assembly are shown in Fig. 7.41. The MCST throughout the equilibrium cycle, calculated by the single channel analyses, is 643°C. The local power distribution within an assembly is taken into account, but heterogeneity of the subchannels is not considered. The maximum cladding surface temperature is calculated again by subchannel analyses in Sect. 7.6. 

Rise of Maximum Cladding Surface Temperature by Subchannel Heterogeneity... 

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