Precise Evaluation of Corrosion Environments of Structural Materials under Complex Water Flow Condition, (II)

Ichikawa, Nagayoshi; Takagi, Junichi

doi:10.1080/18811248.2003.9715437

Cited by 7 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in the primary yields of γ -rays in Table 1, the primary yield of OH is clearly much higher than the sum of the H 2 and H 2 O 2 yields; hence, most of the H 2 and H 2 O 2 were scavenged by OH, leading their low concentrations, even after longer periods of time. In the case of fast neutrons, the primary yield of OH is lower than the sum of the H 2 and H 2 O 2 concentrations in the reports of Wada et al [33], Ichikawa et al [34], Sunaryo et al [35], Lundgren et al [36], and Christensen [37]. The simulation results using these sets of primary yields show that the molecular products have high concentrations, including the highest concentration among all results (Figure 2(b)).…”

Section:  γ-Rays and Fast Neutronsmentioning

confidence: 76%

“…To observe the variation in the calculation results that arose from using different sets of primary yields of water decomposition products, the primary yields for γ -rays and fast neutrons reported by Elliot [31], Elliot and Bartels [32], Wada et al [33], Ichikawa et al [34], Sunaryo et al [35], Lundgren et al [36], Christensen [37], Sanguanmith et al [38], and Butarbutar et al [29] were used. The sets of primary yields for both γ -rays and fast neutrons used in Wada et al [33] and Ichikawa et al [34] are the same. The reaction set and rate constants were taken from Elliot and Bartels [32].…”

Section: Calculationsmentioning

confidence: 99%

“…where G i,γ and G i,FN are the primary yields of the water decomposition product i for radiolysis by γ -rays and fast neutrons, respectively, and D γ and D FN are the dose rates of γ -rays and fast neutrons, respectively. Similarly, to evaluate the variation in the calculation results caused by utilizing different reaction sets and rate constants, the reaction sets reported by Christensen [18], Elliot [31], Elliot and Bartels [32], Wada et al [33], Ichikawa et al [34], and Lundgren et al [36] were employed to simulate water radiolysis by γ -rays using the primary yields taken from Sanguanmith et al [38] and by fast neutrons using the primary yields taken from Elliot and Bartels [32].…”

Section: Calculationsmentioning

confidence: 99%

“…Unlike at ambient temperatures, the accumulated experimental data at elevated temperatures are not well established [25][26][27][28][29][30]. During the past few decades, several groups have attempted to evaluate the chemical reactions and corresponding rate constants based on the accumulated experimental hightemperature data together with the extrapolation and estimation of activation energies and theoretical evaluation [31][32][33][34][35][36][37][38]. Thus, the reaction set and rate constants are constantly being revised based on the literature data.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Primary yields and reaction sets with corresponding rate constants for computer simulation of water radiolysis at elevated temperature

Lertnaisat

Katsumura

Mukai³

et al. 2016

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

The chemical conditions of coolant water in light water reactors are important factors affecting the corrosive environment and the integrity of the structural materials. Computer simulations have commonly been used to predict chemical environment changes due to water radiolysis under extreme conditions. Initial parameters, including the chemical reactions, rate constants, and primary yields of water decomposition by radiolysis, have been reported by several groups in the past few decades. Using a FACSIMILE simulation, the variations caused by utilizing different sets of primary yields of water radiolysis, including γ-rays and fast neutrons, along with the chemical reactions and rate constants at 285°C were evaluated in this study. The rate constant of the reverse reaction of OH + H 2 → H + H 2 O was found to be the main factor controlling the variation between the different sets of chemical reactions and rate constants.

show abstract

Section:  γ-Rays and Fast Neutronsmentioning

confidence: 76%

Section: Calculationsmentioning

confidence: 99%

Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Primary yields and reaction sets with corresponding rate constants for computer simulation of water radiolysis at elevated temperature

Lertnaisat

Katsumura

Mukai³

et al. 2016

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

show abstract

“…From the viewpoint of IGSCC mitigation, the threshold electrochemical corrosion potential (ECP) has been proposed as −230 mV-SHE [15]. However, in the optimal hydrogen concentration deter- [16] [18][19][20]. The models were extended to understand 16 N behaviors in the reactor water and main steam line [21].…”

Section: Bwr Primary Cooling Systemmentioning

confidence: 99%

Water chemistry technology – one of the key technologies for safe and reliable nuclear power plant operation

Uchida

Katsumura

2013

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

Water chemistry control is one of the key technologies to establish safe and reliable operation of nuclear power plants. Continuous and collaborative efforts of plant manufacturers and plant operator utilities have been focused on optimal water chemistry control, for which, a trio of requirements for water chemistry should be simultaneously satisfied: (1) better reliability of reactor structures and fuel rods; (2) lower occupational exposure and (3) fewer radwaste sources. Various groups in academia have carried out basic research to support the technical bases of water chemistry in plants. The Research Committee on Water Chemistry of the Atomic Energy Society of Japan (AESJ), which has now been reorganized as the Division of Water Chemistry (DWC) of AESJ, has played important roles to promote improvements in water chemistry control, to share knowledge about and experiences with water chemistry control among plant operators and manufacturers and to establish common technological bases for plant water chemistry and then to transfer them to the next generation of plant workers engaged in water chemistry. Furthermore, the DWC has tried and succeeded arranging R&D proposals for further improvement in water chemistry control through roadmap planning. In the paper, major achievements in plant technologies and in basic research studies of water chemistry in Japan are reviewed. The contributions of the DWC to the longterm safe management of the damaged reactors at the Fukushima Daiichi Nuclear Power Plant until their decommissioning are introduced.

show abstract

Numerical analysis of diffusion around a suspended expressway by a multi-scale CFD model

Kumakura

Asahi²,

Tomizuka³

et al. 2006

Atmospheric Environment

View full text Add to dashboard Cite

Precise Evaluation of Corrosion Environments of Structural Materials under Complex Water Flow Condition, (II)

Cited by 7 publications

References 12 publications

Primary yields and reaction sets with corresponding rate constants for computer simulation of water radiolysis at elevated temperature

Primary yields and reaction sets with corresponding rate constants for computer simulation of water radiolysis at elevated temperature

Water chemistry technology – one of the key technologies for safe and reliable nuclear power plant operation

Numerical analysis of diffusion around a suspended expressway by a multi-scale CFD model

Contact Info

Product

Resources

About