The Effect Of Hydrazine Addition On The Formation Of Oxygen Molecule By Fast Neutron Radiolysis


Hypothetically speaking, hydrazine could suppress the oxygen formation as a major of corrosion initiator. In this work, we developed a calculation model to understand the effect of hydrazine addition toward the oxygen under PWR condition. Our great interest is to study whether this strategy would also be effectively applied in PWRs[P1] . In the present work, the effect of hydrazine on suppressing the molecule oxygen under neutron irradiation is described.  The simulation was done by using FACSIMILE.  The variation dose applied assuming a batch system and at high dose ~104 Gy s-1.  Three different temperatures were applied, which are room temperature, 250 and 300 oC at two system oxygenated water, which are aeration and deaeration. At room temperature, for deaerated condition, added hydrazine under a range of 10-6 – 10-4 M into primary coolant were not effective to suppress  O2 form since the effect was similar as in the pure water system since for 10-3 M hydrazine addition, a large produce of Owere obtained. In reverse, for deaerated condition, hydrazine concentrate about 10-3 M can suppress O2 form significantly, while hydrazine add in the range between 10-6 – 10-4 M is again confirmed to be the same as in pure water system. For high temperature, at 250 and 300 oC, the results showed that in deaerated condition, hydrazine addition can suppress  O2  form proportionally to its concentration while in aerated condition, hydrazine add with concentration of 10-6 and 10-5 M were not effectively to suppress O2  form, a slightly decrease of O2 occurred due to the addition of 10-4 M hydrazine and 10-3 M of hydrazine can suppress the formation of O2 significantly. [P2] 

 [P1]The added sentence


 [P2]The revised sentence

[ 1] Katsumura Y., et al., “Fast Neutron Radiolysis of Water at Elevated Temperatures Relevant to Water Chemistry”, Progress Nuclear Energy, Vol.32, pp. 113-121 (1998).

[2] Cohen P., “Water Coolant Technology of Power Reactors”. La Grange Park (IL): American Nuclear Society, (1980).

[3] McCracken D. R., et al., “Aspects of the Physics and Chemistry of Water Radiolysis by Fast Neutrons and Fast Electrons in Nuclear Reactors”, Report AECL No.: 11895, Chalk River (Ontario): Atomic Energy of Canada Ltd. (1998).

[4] Woods R.J. and Pikaev A.K., “Applied Radiation Chemistry: Radiation Processing”, Wiley, New York (1994).

[5] Research needs and opportunities in radiation chemistry workshop, Chesterton (IN), 19- 22 April 1998, Report No.: DOE/SC-0003. Germantown (MD): U.S. Department of Energy, Office of Basic Energy Sciences; 1999. Available from production/bes/chm/Publications/RadRprt.pdf

[6] Garbett K., et al., “Hydrogen and Oxygen Behavior in PWR Primary Coolant Water Chemistry of Nuclear Reactor Systems”, Proceedings Of The 8th Conference Organized by The British Nuclear Energy Society, October 22-26, Bournemouth, UK (2000).

[7] Ishida K., et al., ‘‘Hydrazine and Hydrogen Co-Injection to Mitigate Stress Corrosion Cracking of Structural Materials in Boiling Water Reactors, (I) Temperature Dependence of Hydrazine Reactions,’’ Journal of Nuclear Science Technology, Vol.43, pp.65 (2006).

[8] Sunaryo G.R. and Domae M., “Numerical Simulation on Effect of Methanol Addition on Coolant Radiolysis in Pressurized Water Reactor”, Journal of Nuclear Science and Technology, Vol.45, Issue 12, pp.1261–1274 (2008).

[9] Ishigure K., et al., ‘‘Radiolysis of High Temperature Water,’’ Radiation Physical Chemistry, Vol.46, Issue 557, pp. 4-6 (1995).

[10] Elliot A.J. and Bartels D.M., “The Reaction Set, Rate Constants and G-Values for the Simulation of the Radiolysis of Light Water Over the Range 20° to 350 °C Based On Information Available in 2008”, Report AECL No.: 153-127160-450-001, Chalk River (Ontario), Atomic Energy of Canada Ltd. (2009).