Open Access

Table 2

Yankee Rowe general data and assumptions.

Parameter Value Remark
Rod outside diameter (cm) 0.864 [1,12]
Cladding thickness (cm) 0.053 [1,12]
Gap size (diametral) (cm) 0.011 [1,12]
Fuel rod pitch (cm) 1.153 [1,12]
Fuel pellet diameter (cm) 0.747 [1,12]
Fuel pellet density (%) 93 [1]
Fill gas internal rod pressure (MPa) 0.1 The fuel rod is not pressurized [1]
Active fuel length (cm) 229.9 [12]
Concentration of the gas components at the beginning of the calculation 0.8 N2
0.2 O2
The fuel rod is not pressurized, then it was considered the air composition [1]
U235 enrichment degree (%) 3.4 [1,12]
Free volume in the upper plenum available for filling gas and fission gas (cm3) 4.359 The plenum height assumption considered a conservative value taking into account the fuel stack height
Coolant flow rate (g h–1) 7.86 × 105 [12]
Coolant temperature (°C) 252 [1,12]
Coolant pressure (MPa) 14 [1,12]
Average LHGR (kW m–1) 11.4 Average rod power given in the literature for the Yankee Rowe fuel rods [1,12]
Design LHGR (kW m–1) 35.3 Design rod power given in the literature for the Yankee Rowe fuel rods [1,12]
Maximum cladding temperature surface (°C) 343 [1,12]
Average burnup (MWd tU–1) 31000 [1,12]
Neutron flux (cm–2 s–1) 6.3 × 1013 Average assumed value to achieve the final fluence level and burnup [1,12]
Final fluence level (n cm–2) 6 × 1021 [1,12]

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