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| Program name | Package id | Status | Status date |
|---|---|---|---|
| IFPE/EDITH MOX01 | NEA-1615/10 | Arrived | 06-JUN-2000 |
| IFPE/CEA-DEFECTFUEL | NEA-1615/11 | Arrived | 16-JAN-2023 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-1615/10 | Many Computers | |
| NEA-1615/11 | Many Computers |
The release of fission products from irradiated UO2 into the fuel-clad gap of a sound rod has been studied extensively, both theoretically and experimentally. By contrast very little is known about the behaviour within a defective rod, where the pressure of water or steam in the gap may modify the processes of release from the fuel, through the defect, to the coolant.
A series of loop experiments have been performed on short fuel rods by CEA in France with the aim of measuring and interpreting the release rate of fission gases and iodine under a range of experimental conditions of linear power, defect type, gap dimensions etc. The results from these experiments, which cover steady state and transient power operation on new and pre-irradiated fuel, provide invaluable data for modelling the escape of fission products from defective fuel rods. In a commercial reactor, such modelling is important for assessing the occurrence and characteristics of defective fuel from analysis of coolant activity. Knowledge of the presence of defective fuel can eliminate the need for premature shut down of the reactor and an also minimizes outage time, thus improving the safety and economics of power generation. The experiments were all performed in the Siloe reactor in one of two water loops called Bouffon and Jet Pompe.
The Bouffon loop consists of two vertical tubes connected at both ends to form a continuous circuit for pressurised water. The experimental fuel rod is situated in the bottom of one tube below a heater, which provides an up current of water, and hence by thermosyphoning, a flow of cooling water over the experimental fuel rod.
The Jet Pompe loop comprises two co-axial vertical tubes. The experimental fuel rod is situated in the inner tube and coolant flow over it is provided by a steam injector pump at the bottom of the same tube. The steam at 400 C and 35 bars is obtained from a steam generator installed elsewhere in the rig.
The CEA Defect Fuel experiments are CYFON 1, CYFON 2, EDITH 1, EDITH 2, EDITH 5, CRUSIFON 1BIS, CRUSIFON 2, CRUSIFON 5 and EDITH MOX 01.
| Package ID | Status date | Status |
|---|---|---|
| NEA-1615/10 | 06-JUN-2000 | Masterfiled restricted |
| NEA-1615/11 | 16-JAN-2023 | Masterfiled restricted |
Keywords: experimental data, fission gas release, fuel pellets, fuel rods, irradiation.
