This study proposes a predictive monitoring method for irradiation assisted stress corrosion cracking (IASCC) of austenitic stainless steels. High purity model austenitic stainless steel s were irradiated up to ldpa or 5dpa in JRR-3. IASCC susceptibility of the irradiated specimens was determined by scanning electro microscopy (SEM) on fractured surface of the specimens after slow strain rate tensile (SSRT) testing in high temperature water simulating boiling water reactor (BWR) conditions. Magnetic proper...
英字タイトル:
A Study of Testing Method for Predictive-Monitoring of IASCC Susceptibility

For the aging of fuel reprocessing facilities, constant load tensile tests with controlled potentials and electrochemical tests for zirconium were conducted in nitric acid and sodium nitrate solutions. Consequently, information was obtained regarding the effects of nitric acid and nitrate ion concentrations on the stress corrosion-cracking initiation and effects of nitric acid and plutonium concentrations in solutions, along with the liquid temperature on natural potential. Based on the test results, a map ...
英字タイトル:
Consideration on Stress Corrosion Cracking Evaluation of Zirconium for Fuel Reprocessing Facilities

水素脆化に関するこれまでの研究は電気化学的手法により還元的状態において強制的に水素チャージした条件での研究であり，実機相当異材接合継手における，実機硝酸溶液環境のように表面に酸化皮膜が存在した状態での放射性核種からの放射線による分解水素の吸収挙動については確認されておらず，このような実機を考慮した試験研究が，商用再処理施設における異材接合継手の維持管理のために重要であると考えられる． 本研究では，硝酸濃度及び照射線量が異材接合継手における水素脆化に及ぼす影響に注目し，放射線照射下での水素吸収試験を実施し，その結果に基づき，経年劣化事象に対する機器の維持・管理をするための技術的着眼点を取りまとめた．...
英字タイトル:
Consideration on Hydrogen Embrittlement Evaluation of Explosion-bonded Joints for Fuel Reprocessing Facilities

Corrosion of ultra-low carbon type 304 stainless steel in boiling nitric acid solution was analyzed by statistical approach. A large scale mock-up of an evaporator was introduced to perform corrosion test of heat exchanger tubes, and change in loss of wall thickness and intergranular penetration depths of the tubes during test duration was measured and analyzed statistically applying normal distribution and Gumbel distribution. As the results, it was considered that tube wall was corroded uniformly an...
英字タイトル:
Statistical Approach on Corrosion of Stainless Steel in Boiling Nitric Acid for Prevention Maintenance of Nuclear Fuel Reprocessing Plant

Corrosion of ultra-low carbon type 304 stainless steel in boiling nitric acid solution was analyzed by statistical approach. A large scale mock-up of an evaporator was introduced to perform corrosion te st of heat exchanger tubes, and change in loss of wall thickness and intergranular penetration depths of the tubes during test duration was measured and analyzed statistically applying normal distributi on and Gumbel distribution. As the results, it was considered that tube wall was corroded uniformly and m...
英字タイトル:
Statistical Approach on Corrosion of Stainless Steel in Boiling Nitric Acidfor Prevention Maintenance of Nuclear Fuel Reprocessing Plant