TY - JOUR
T1 - Development of a method to lower recontamination after chemical decontamination by depositing Pt nano particles
T2 - (I) Consideration of the suppression mechanism using a quantum dynamics calculation
AU - Ito, Tsuyoshi
AU - Ohashi, Toshimasa
AU - Hosokawa, Hideyuki
AU - Kawasaki, Tooru
AU - Aizawa, Motohiro
AU - Ishizawa, Yukie
AU - Inaba, Kenji
AU - Hatakeyama, Nozomu
AU - Miyamoto, Akira
N1 - Publisher Copyright:
© 2015 Atomic Energy Society of Japan. All rights reserved.
PY - 2016/6/2
Y1 - 2016/6/2
N2 - The Pt coating (Pt-C) process has been developed to lower the recontamination by radioactive elements after chemical decontamination of piping surfaces. In this process, a layer of fine Pt nano particles is formed in an aqueous solution on the base metal of the piping following the chemical decontamination. In this study, we confirmed that the suppression effect by the Pt-C toward 60Co deposition on type 316 stainless steel using a 60Co deposition test under hydrogen water chemistry. Furthermore, we investigated the suppression mechanism of deposition of radioactive elements by a quantum molecular simulation. The deposition amounts of 60Co which were incorporated in oxides after 1000 h with and without the Pt-C process were about 90 and 10.2 Bq/cm2, respectively. The amount of 60Co deposition with Pt-C is about 10% that of non-coated specimens. The 60Co incorporation for the Pt-C specimen was suppressed by decreasing the formation of oxides. We considered this phenomenon using a quantum dynamics calculation and concluded that the Fe-O bonds in oxides were weakened by the effect of Pt and hydrogen radicals which were produced in the reaction between H2 and Pt, and then oxides were dissolved into the water.
AB - The Pt coating (Pt-C) process has been developed to lower the recontamination by radioactive elements after chemical decontamination of piping surfaces. In this process, a layer of fine Pt nano particles is formed in an aqueous solution on the base metal of the piping following the chemical decontamination. In this study, we confirmed that the suppression effect by the Pt-C toward 60Co deposition on type 316 stainless steel using a 60Co deposition test under hydrogen water chemistry. Furthermore, we investigated the suppression mechanism of deposition of radioactive elements by a quantum molecular simulation. The deposition amounts of 60Co which were incorporated in oxides after 1000 h with and without the Pt-C process were about 90 and 10.2 Bq/cm2, respectively. The amount of 60Co deposition with Pt-C is about 10% that of non-coated specimens. The 60Co incorporation for the Pt-C specimen was suppressed by decreasing the formation of oxides. We considered this phenomenon using a quantum dynamics calculation and concluded that the Fe-O bonds in oxides were weakened by the effect of Pt and hydrogen radicals which were produced in the reaction between H2 and Pt, and then oxides were dissolved into the water.
KW - boiling water reactor
KW - corrosion
KW - decontamination
KW - stainless steel
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U2 - 10.1080/00223131.2015.1077169
DO - 10.1080/00223131.2015.1077169
M3 - Article
AN - SCOPUS:84941695223
VL - 53
SP - 831
EP - 841
JO - Journal of Nuclear Science and Technology
JF - Journal of Nuclear Science and Technology
SN - 0022-3131
IS - 6
ER -