Measurement of erosion-corrosion synergism with a slurry wear test apparatus

Role of residual stresses induced by industrial fabrication on stress corrosion cracking susceptibility of austenitic stainless steel

On the mechanism of radiation-induced segregation in austenitic Fe–Cr–Ni alloys

Control of welding residual stress for ensuring integrity against fatigue and stress–corrosion cracking

A service provider receives fluid test data generated from multiple different entities and permits authorized users affiliated with the different entities, as well as others, to visualize information associated with that data to via the Internet using graphical computer interfaces at respective computers. The fluid test data can be gathered using portable sensor units equipped with GPS and wireless communication to transmit the fluid test data and geographical information to the service provider.

Systems and methods for fluid quality sensing, data sharing and data visualization

A zirconium-based alloy with a high corrosion resistance, consisting essentially of 1 to 2 wt % Sn, 0.20 to 0.35 wt % Fe, 0.03 to 0.16 wt % Ni and the balance substantially Zr. The Fe/Ni content ratio of the alloy ranges between 1.4 and 8. The structure of the alloy has fine intermetallic compound of Sn and Ni is precipitated within the zirconium crystal grain of α-phase. The alloy may further contain 0.05 to 0.15 wt % Cr. This alloy exhibits reduced hydrogen absorption rate and suffers from no nodular corrosion, so that it can suitably be used as a material of nuclear fuel cladding tubes. The nuclear fuel cladding tube made of this alloys exhibits extended service life when used in a nuclear reactor of high degree of burn-up.

Zirconium-based alloy with high corrosion resistance

Solute segregation along non-migrated and migrated grain boundaries during electron irradiation in austenitic stainless steels

A plant operational status monitoring supervisory system comprising; means for extracting information directly relating to water quality of an objective portion consecutively for a period of time by means of an electrochemical water quality sensor installed in an objective portion to monitor in-situ in a plant; means for evaluating water quality based on thus extracted information; means for comparing an obtained water quality evaluation result with a reference value for a predetermined plant operation procedure; and means for displaying or storing necessary portion out of said comparison results; is disclosed. An electrochemical reference electrode used in this system being provided with an electrolyte layer containing ion of the electrode member; a porous ceramic layer surrounding the same without permeating liquid; and electrode member electrochemically contacting with said elec-trolyte layer; and a terminal electrically contacting with said electrode member; and further having a long life in high temperature water, various status of high temperature water in objective portions and that of nearby constituent members in a plant are possible to be monitored online by means of this reference electrode. Further, because monitored data are processed by means of a neural network, the higher precision level of monitoring has been achieved.

Monitoring system for plant operation condition and its in-situ electrochemical electrode

A method of producing cladding tube comprises a step of temperature-gradient annealing in which the inner surface of the tube is heated to a temperature higher than the recrystallization temperature thereof, while the outer surface of the tube is cooled, after the tube has been hot-extruded. The temperature-gradient annealing is effected while a temperature gradient is maintained between the inner surface and the outer surface of the cladding tube. While keeping the inner surface at a temperature higher than the recrystallization temperature, and the outer surface at a temperature lower than the recrystallization temperature. The cladding tube is obtained with the outer surface which has an excellent resistance to nodular corrosion and a soft inner surface which has an excellent resistance to stress corrosion cracking.

Method of producing a cladding tube for reactor fuel

Effect of MnS inclusions on the stress corrosion cracking (SCC) of low-alloy steel in 288°C oxygenated pure water was studied using slow strain rate tensile (SSRT) test MnS inclusions dissolve and can act as starting points of SCC At high amounts of dissolved oxygen (about 8 ppm), pitting corrosion and MnS inclusions act as starting points of SCC, while at low amounts of dissolved oxygen (about 02 ppm), MnS inclusions dominate the SCC initiation The probability of MnS inclusions existing on the specimen side surface is an important factor for SCC initiation susceptibility of the material The number of SCC starting points in intermediate sulfur content material (about 0015 wt%S) is larger than that in low-sulfur content material (about 0004 wt%S) The existence of MnS inclusions also affects the SCC propagation, particularly at low, dissolved oxygen (about 02 ppm)

Isao Masaoka

Papers

Zirconium-based alloy with high corrosion resistance

Solute segregation along non-migrated and migrated grain boundaries during electron irradiation in austenitic stainless steels

Monitoring system for plant operation condition and its in-situ electrochemical electrode

Method of producing a cladding tube for reactor fuel

Effect of MnS inclusions on stress corrosion cracking in low-alloy steels