TAILIEUCHUNG - On the dose fields due to activated cooling water in nuclear facilities

This paper focuses on activation of oxygen isotopes in water and decay of this activated isotopes, . 16N, 17N and 19O. An analysis of activation of water in pressurized water reactors and in fusion reactors was performed. Different evaluated nuclear data libraries were used in activation calculations (ENDF/, , and TENDL-2015). | Progress in Nuclear Energy 117 2019 103042 Contents lists available at ScienceDirect Progress in Nuclear Energy journal homepage locate pnucene Review On the dose fields due to activated cooling water in nuclear facilities T Andrej Žohar Luka Snoj Jožef Stefan Institute Jamova cesta 39 SI-1000 Ljubljana Slovenia ARTICLE INFO ABSTRACT Keywords Activated cooling water in nuclear facilities can present a significant radiation source around primary cooling Activated cooling water system causing radiation damage to electrical components increasing doses to personnel and in the case of PWR fusion facilities additional heating to superconducting coils. This paper focuses on activation of oxygen isotopes Fusion reactor in water and decay of this activated isotopes . 16N 17N and 19O. An analysis of activation of water in pres- MCNP surized water reactors and in fusion reactors was performed. Different evaluated nuclear data libraries were used Cooling pipes in activation calculations ENDF and TENDL-2015 . The calculated activation Steam generator rates with different nuclear data libraries agree well for the 16O n p 16N reaction and significantly differ for 17O n p 17N and 18O n γ 19O reactions. In fusion reactor the specific activity of activated water isotopes is in the order of 1013 Bq m3 MW which is five orders of magnitude higher compared to specific activity in a typical fission pressurized water reactor amounting to 109 Bq m3 MW. The results of specific activity of cooling water were used to perform parametric analysis of dose rates around pipes of cooling system and dose field around a steam generator in a pressurized water reactor as a representative of heat exchangers. The analysis of dose rates around pipes include pipes featuring 1 mm to 8 cm thick walls and from cm to 60 cm water radius. Results can be used to estimate dose rates for all studied isotopes provided the specific activity is known. For heat .

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• Nuclear energy
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