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Characterization of neutron fields at Cernavoda NPP

Characterization of neutron fields at Cernavoda NPP. Vanessa Cauwels Filip Vanhavere , Dorin Dumitrescu , Alecsandru Chirosca , Luke Hager , Marc Million , James Bartz. IRPA conference Glasgow, May, 14, 2012. Introduction.

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Characterization of neutron fields at Cernavoda NPP

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  1. Characterization of neutron fieldsat CernavodaNPP Vanessa Cauwels Filip Vanhavere, DorinDumitrescu, AlecsandruChirosca, LukeHager, Marc Million, James Bartz IRPA conference Glasgow, May, 14, 2012

  2. Introduction • Neutron fluence to ambient dose conversion coefficients are strongly energy dependent Directionaldistribution Conclusion Introduction Energy distribution Fluenceestimation

  3. Energy distribution Nprobe (BTI) 40.2 pSvcm² 55.7 pSvcm² 137 pSvcm² Introduction Directionaldistribution Conclusion Energy distribution Fluenceestimation

  4. Fluence estimation • Ambient monitors Eberline FHT 752 Studsvik2202D Wendi II Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  5. Fluence estimation • Ambient monitors Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  6. Directional distribution • What if we assume the fluence is unidirectional? Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  7. Directional distribution • What if we assume the fluence is isotropic? Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  8. Directional distribution • Directional distribution estimation Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  9. Directional distribution • Directional distribution estimation Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  10. Directional distribution • Directional distribution estimation Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  11. Conclusion • What did the personal dosemeters say? Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

  12. Conclusion • Neutron dosimetry is not straightforward due to the strong energy and angular dependency of the neutron personal dose equivalent • Neutron field characterization is therefore indespensable, allowing knowledge of the energy spectrum and directional distribution • The energy spectrum was recorded using an Nprobe • The directional distribution was estimated by placing several personal dosemeters on a slab phantom • Comparison between different approaches shows the big importance of taking this directional distribution into account. • Moreover the measured value of the personal dosemeters must be evaluated with great care and compared with the calculated reference value Introduction Directionaldistribution Conclusion Energydistribution Fluenceestimation

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