... The Babcock & Wilcox Company used Mn-Mo-Ni automatic submerged-arc welds with the Linde 80 flux type for the fabrication of 14 currently operating PWR reactor vessels. Due to the fact that the weld wire was copper-coated (high copper content) and that they have low upper-shelf toughness...

... The B&W Owners Group (B&WOG) developed the Master Integrated Reactor Vessel Surveillance Program (MIRVP) to encompass all domestic operating pressurized water reactors (PWRs) with reactor vessels that contain Linde 80 submerged-arc welds. These PWRs include the reactor vessels fabricated...

...; and c) an atomic scale, atom probe field ion microscopy study into the nanostructure-chemistry of a CRP. small angle neutron scattering submerged-arc welds reactor vessel Russell-Brown hardening model radiation embrittlement Brian D. Wirth 1, G. Robert Odette2, Wayne A. Pavinich3, Glenn E...

... fracture specimens. Combustion Engineering reactor vessel surveillance programs do not have compact fracture specimens. Therefore, the CE Owners Group developed a program to validate the master curve method for Charpy-sized and reconstituted Charpy-sized specimens for future application on irradiated...

..., precracking technique, selection of test temperature, test technique, and data analysis is summarized in this paper. fracture toughness fracture mechanics Linde 80 weld reactor vessel transition range master curve neutron embrittlement reconstituted Charpy specimens reactor vessel surveillance...

... The Babcock and Wilcox Owners Group (B&WOG) is sponsoring an on-going study to develop an understanding of radiation embrittlement of Linde 80 reactor vessel welds from a micro-mechanical viewpoint. Previous work that focused on characterizing the large microstructural features indicated...

... This paper presents the results of further microstructural evaluations of irradiated Mn-Mo-Ni wire/Linde 80 flux submerged-arc weld metals typically found in Babcock & Wilcox fabricated reactor vessels. Four Mn-Mo-Ni wire/Linde 80 surveillance weld metals were studied to characterize...

... A Master Integrated Reactor Vessel Surveillance Program (MIRVP) was designed to provide the data required to ensure the continued licensability of 17 reactor vessels including 8 Babcock & Wilcox (B&W)-designed 177-fuel assembly (FA) plants and 9 Westinghouse-designed plants with B&W...

... This paper presents the results of additional microstructural evaluations of Mn-Mo-Ni wire/Linde 80 flux submerged-arc weld metals typically found in Babcock & Wilcox fabricated reactor vessels. Optical metallography was performed on four Mn-Mo-Ni wire/Linde 80 surveillance weld metals...

... The reference toughness technique, developed under the sponsorship of the Electric Power Research Institute (EPRI), is utilized to predict radiation-induced changes in fracture toughness of reactor vessel steels using Charpy impact data from the Heavy Section Steel Irradiation (HSSI) program...

... validated standard methods for calculating and measuring neutron flux and fluence parameters and the correlation of these parameters to embrittlement of pressure vessel steels in light water reactors. Our knowledge of radiation damage to reactor vessels has also been greatly increased in recent years...

... The Babcock & Wilcox (B&W) Owners Group Integrated Reactor Vessel Surveillance Program contained two irradiation phases in addition to the plant specific surveillance programs. One phase provided materials for a short-term (test reactor) study of the effects of neutron irradiation...

... Charpy impact and compact fracture specimens were tested to determine the response of actual reactor vessel weld metals to the in-situ annealing cycle (454°C for 168 h) suggested by the Electric Power Research Institute (EPRI). This annealing cycle was developed to recover fracture properties...

... The integrated reactor vessel material surveillance program was initiated in 1977 as the direct result of two driving forces: (1) the need to obtain better characterization of fracture toughness data for irradiated weld metals to ensure continued licenseability of operating plants, and (2...

... The chemical compositions of Babcock & Wilcox Nuclear 177 fuel assembly (B&W 177 FA) reactor vessel beltline welds were characterized. Emphasis was placed on copper concentration and variability due to the effect of copper on the fracture and impact toughness properties of irradiated...