Break of a transducer line

Morell et al. (1985) as well as Hellmann et al. (1991) reported on such technical-scale experiments using an experimental setup which is schematically shown in Fig. 6.6. From a high-pressure vessel, water at 310 °C, 10 MPa and doped with an appropriate tracer is supplied to a IS mm diameter orifice simulating the break in the transducer line, from where it expands into a SOm vessel initially kept at ambient temperature (which in the course of the experiment increased to about 100 °C) and pressure this volume roughly corresponds to that of a transducer compartment. The steam produced in the flash evaporation process is carried off 

Radiochemistry under the conditions of reactor accidents Release (%) 

Tracer U 100% I 90%l /10%l2 90%l /10%l2 (Geometry orifice all tests like Li-Ill) (sump stored) 

In a flash evaporation the liquid is atomized, forming very fine droplets with diameters of less than 20 pm which will be transported in part by the steam flow these droplets are the carriers of non-volatile radionuclides. In order to determine the extent of entrainment, Li was used as a non-volatile tracer in these experiments. The results of the experiments performed over periods of more than 30 minutes each (in order to obtain information on the initial discharge phase as well as on the steady-state phase) showed an entrainment of liquid with the steam to the condenser tank on the order of 0.2% (related to the total amount of tracer used), independent of the geometrical position of the orifice (in a horizontal or a vertical direction the arrows shown in Fig. 6.7. indicate schematically the direction 

It is suspected that, besides I2 and HOI, hydroiodous acid HI can, in principle, contribute to iodine volatility in a transducer line break. HI is a strong acid which in dilute aqueous solution is highly dissociated. However, according to the equilibria 

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Break of a transducer line containing primary coolant under system pressure... 

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