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PHEBUS FP is a CEC and CEA-IPSN co-sponsored project operating in the existing Cadarache-based PHEBUS experimental reactor. It is concerned with LWR severe fuel damage and fission product source term experimentation. This paper considers the instrumentation and methods used to extract experimental data from PHEBUS FP tests. The fraction and nature of radioactive fission products that reach the containment, and how they behave in the containment, is critical to accident source term estimates. Iodine radiochemistry is emphasised and monitored in the containment vessel over about one week; iodine in the gas phase and in the liquid phase of the sump is monitored on-line (using gamma spectrometers and selective samplers) and off-line (through numerous adsorption and sampling devices). Calibration and quality control of instruments and analytical methods is important in achieving control of these uncommon tests and having confidence in data on FP releases in severe accidents.

Additional information

Authors: ZEYEN R, CEN Cadarache (FR);CLEMENT B, CEN Cadarache (FR)
Bibliographic Reference: Paper presented: Specialists' Meeting on Instrumentation to Manage Severe Accidents, Köln (DE), March 16-17, 1992
Availability: Available from (1) as Paper EN 36583 ORA
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