Environmental Fatigue of Metallic Materials in Nuclear Power Plants – A Review of Korean Test Programs

Effects of mixed strain rates on low cycle fatigue behaviors of austenitic stainless steels in a simulated PWR environment

“…Our results are consistent with the prior studies such that fatigue life in PWR water decreased with decreasing strain rate within strain rates from 0.4 to 0.0004%/s [1][2][3][4][5][6][7]. Also, it is thought that the fatigue life of 316LN SS is affected by environmentally-assisted cracking (EAC) mechanisms in PWR water as previously reported by authors [11,[13][14][15]. However, it is not easy to compare the fatigue life in PWR water with the mixed strain rate tests and the comparable constant strain rate from Fig.…”

“…These secondary hardening behavior induced by DSA for several austenitic SSs was also reported under low strain amplitude at high temperatures of approximately 300°C [14,[18][19][20]. Meanwhile, the magnitude of hardening in simulated PWR water is higher than that in air environment because the corrosion-produced and absorbed hydrogen contributed to the DSA in PWR environments, as previously reported for austenitic alloys [11][12][13][14].…”

“…The details are described in the previous studies [11,12]. The test environment was simulated PWR water at 310°C and 15 MPa (hereinafter denoted as ''PWR water'') containing representative concentrations of dissolved boric acid and lithium hydroxide.…”

“…During the LCF test, the strain in the gauge section was indirectly measured using a linear variable differential transformer (LVDT) attached at the shoulders of the specimen. The strains in the gauge section were calculated from the values between the shoulders using the correlation between the two values which was established before the test as described before [11]. The schematics of strain measurement are shown in Fig.…”

Spesifikasi, Kode dan Standar Baja Nasional dan Potensinya untuk Mendukung Program PLTN Tipe LWR di Indonesia

“…Ucapan terima kasih yang sebesar besarnya kepada pihak PPKP KEMENRISTEK yang telah membantu mendanai kegiatan ini dan berbagai pihak industri baja yang telah membantu memberikan data dan informasi. Studi ini merupakan bagian dari Laporan Akhir "Pemetaan Rantai Pasokan Industri Pembangunan PLTN di Indonesia [32].…”