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Extra info for LMFR Core and Heat Exch. Thermohydraulic Design - USSR Approaches (IAEA TECDOC-1060)

Example text

Permanent magnet is entered into the tube of stainless steel surrounded by by-pass ring of armco steel (Fig. 16, a). The magnet axis is coincident with the tube diameter being at right angles to the flow (we are dealing with the axial direction). At the external surface of the tube the neck is made where the cooper shield ring enclosing the magnet is fitted to. The ring has the cut filled with insulator, in which two electrodes being in contact with the coolant and reading longitudinal component of velocity are fixed.

To calculate £k for fast reactor pins the following relations can be used: ^•(l-*,)-* ___ V -X, I Jti -r jin ! where ' *i -X, / \ X, +Xf a + ^——2. (i + x)_ v __ -V / + x. "» ^ *' -x. -. 5) •0- $0=R0/R2; a= The remainder are explained in Fig. 1 0-c. Number of the main harmonics in Fourier series is accepted to be equal k=k0=6 for the regular part of bundle and k=k0=l for the edge pins. 3 10~2(m2K)/W. An internal structure of the pin has no effect on the value of £k for the most part, as shown in [30].

To find the best construction to be followed, some variously of the sensors constructed were investigated, which differ in shape and in size of the magnet, in material and number of electrodes, in technique of the electrodes embedded into the tube surface, in an angle between the electrodes, in extent to which a magnetic field to be located at the magnet end (the availability or the absence of shield rings) and so on. Experiments were carried out in the channels of various sharp, (Fig. 2) and non-standard edge channels (hexagonal models are extensively used).

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