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Overview Of Us Research And Regulatory Activities On Neutron Radiation Embrittlement Of Pressure Vessel Steel
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Book Synopsis Overview of U.S. Research and Regulatory Activities on Neutron Radiation Embrittlement of Pressure Vessel Steel by : PN. Randall
Download or read book Overview of U.S. Research and Regulatory Activities on Neutron Radiation Embrittlement of Pressure Vessel Steel written by PN. Randall and published by . This book was released on 1989 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper is in several parts: the first presents an overview of research activities sponsored by the U.S. Nuclear Regulatory Commission (NRC) on neutron irradiation embrittlement of pressure vessel steels. A series of irradiation experiments have evaluated effects of chemistry on the fracture toughness properties of submerged arc welds representing current nuclear vessel fabrication practices and provide data to validate ASME Code practices. A correlation between Charpy energy and fracture toughness is being studied as is a program on radiation sensitivity to define the role of dose rate and to study the effects of postirradiation heat treatment (annealing). The development of a comprehensive data base for radiation embrittlement data has been initiated and is being applied in a correlation of reactor surveillance data with test reactor data. A comprehensive dosimetry effort has produced 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 by the accumulation of power reactor surveillance data and by better models and better analysis techniques applied to that data. Unfortunately, the results show that radiation damage is often more than previously predicted, using Revision 1 of NRC Regulatory Guide 1.99, and will result in more restrictive pressure temperature limits. The second part of this paper describes some of the system and operational impacts produced, which in turn lead to challenges to long-established safety margins. Finally, a number of outstanding issues which require further research are discussed, many of which will require better understanding of radiation damage mechanisms.
Book Synopsis Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels by : Lendell E. Steele
Download or read book Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels written by Lendell E. Steele and published by ASTM International. This book was released on 1989 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels by : Lendell E. Steele
Download or read book Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels written by Lendell E. Steele and published by ASTM International. This book was released on 1986 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels by : Lendell E. Steele
Download or read book Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels written by Lendell E. Steele and published by ASTM International. This book was released on 1993 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a Mechanistic Understanding of Radiation Embrittlement in Reactor Pressure Vessel Steels by :
Download or read book Development of a Mechanistic Understanding of Radiation Embrittlement in Reactor Pressure Vessel Steels written by and published by . This book was released on 1988 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Usnrc Research on Reactor Pressure Vessel Steel Embrittlement by : M. Mayfield
Download or read book Usnrc Research on Reactor Pressure Vessel Steel Embrittlement written by M. Mayfield and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Meutron radiation embrittlement of nuclear reactor vessels continues to be a major concern of the USNRC. Research is sponsored for improving understanding of radiation embrittlement effects to predict margins of safety and to improve regulations. Regulatory issues that are affected by neutron embrittlement are examined and related to NRC research. Factors that control radiation embrittlement are examined. A comprehensive collection of radiation embrittlement data from surveillance reports and other published reports has been compiled in a computerized data base (PR-EDB). Fracture toughness data for irradiated pressure vessel steel has provided the basis for crack initiation and crack arrest toughness curves. Work is in place to improve our ability to predict thermal annealing recovery and reembrittlement. Areas where additional data are needed are described.
Book Synopsis Overview of Studies in the United Kingdom on Neutron Irradiation Embrittlement of Pressure Vessel Steels by : LM. Davies
Download or read book Overview of Studies in the United Kingdom on Neutron Irradiation Embrittlement of Pressure Vessel Steels written by LM. Davies and published by . This book was released on 1986 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper describes work on irradiation embrittlement that has been undertaken in the United Kingdom since preparation of the Second Marshall Report on the Integrity of pressure water reactor (PWR) pressure vessels. Results from research programs concentrate specifically on work on steels for Magnox and PWR pressure vessel (PV) applications.
Book Synopsis Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels by : Lendell E. Steele
Download or read book Radiation Embrittlement of Nuclear Reactor Pressure Vessel Steels written by Lendell E. Steele and published by ASTM International. This book was released on 1986 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Irradiation Embrittlement of Reactor Pressure Vessel Steels by : Lendell E. Steele
Download or read book Neutron Irradiation Embrittlement of Reactor Pressure Vessel Steels written by Lendell E. Steele and published by . This book was released on 1975 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Nickel on Irradiation Embrittlement of Light Water Reactor Pressure Vessel Steels by : International Atomic Energy Agency
Download or read book Effects of Nickel on Irradiation Embrittlement of Light Water Reactor Pressure Vessel Steels written by International Atomic Energy Agency and published by IAEA. This book was released on 2005 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication sets out the findings of a co-ordinated research project to determine the influence of the mechanism of the deterioration effect in radiation embrittlement of reactor pressure vessel steels with a high nickel content in nuclear power plants, including procurement of materials, determination of mechanical properties, irradiation and testing of specimens, and microstructural characterisation.
Book Synopsis New Information on Neutron Embrittlement and Embrittlement Relief of Reactor Pressure Vessel Steels by : L. E. STEELE
Download or read book New Information on Neutron Embrittlement and Embrittlement Relief of Reactor Pressure Vessel Steels written by L. E. STEELE and published by . This book was released on 1964 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron embrittlement of the carbon and low-alloy steels investigated has been defined in terms of increases in the nil ductility transition (NDT) temperature. Increases in the NDT of pressure vessel steels as great as 545F have been observed. The extent of embrittlement has been shown to depend upon the neutron exposure, the type of steel, and the irradiation temperature. Embrittlement relief through annealing heat treatment at temperatures above the pressure vessel operating temperature has been demonstrated. Significant embrittlement relief was observed even with multiple irradiation-annealing cycles, the extent of relief being primarily dependent upon the irradiation temperature and the subsequent annealing temperature. Experimental data are reviewed with consideration for application to operating nuclear pressure vessel conditions. Preliminary results of power reactor surveillance and of the evaluation of one pressure vessel after nuclear service are related to experimental results. The value of extending the evaluation of surveillance speciments and of pressure vessels after removal from nuclear service are reviewed with reference to current uncertainties as to possible nuclear environmental and stress effects. (Author).
Book Synopsis Radiation embrittlement of nuclear reactor pressure vessel steels by :
Download or read book Radiation embrittlement of nuclear reactor pressure vessel steels written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrity of Reactor Pressure Vessels in Nuclear Power Plants by :
Download or read book Integrity of Reactor Pressure Vessels in Nuclear Power Plants written by and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is intended to assist nuclear utilities in optimizing the service life of nuclear power plants. It reviews the latest research on the effects of neutron irradiation on the steels and welds of reactor pressure vessels within light water cooled and moderated reactors.
Book Synopsis The Neutron Induced Embrittlement of Reactor Pressure Vessel Steels and Ferritic Alloys by : J. Ahlf
Download or read book The Neutron Induced Embrittlement of Reactor Pressure Vessel Steels and Ferritic Alloys written by J. Ahlf and published by . This book was released on 1984 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chapter 2--Neutron Embrittlement of Pressure Vessel Steels--A Brief Review by :
Download or read book Chapter 2--Neutron Embrittlement of Pressure Vessel Steels--A Brief Review written by and published by . This book was released on 1970 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear radiation has been shown to affect the properties of structural steels; primarily through hardening and embrittlement. Such changes may be small or large, but in any case they must be defined so that the condition of the reactor vessel is known at every phase of reactor life. This is the basis for reactor vessel surveillance.
Book Synopsis Assessing Steady-State Neutron Exposure Effects Through Analyses of Reactor Vessel Surveillance Data by : TR. Mager
Download or read book Assessing Steady-State Neutron Exposure Effects Through Analyses of Reactor Vessel Surveillance Data written by TR. Mager and published by . This book was released on 1983 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of steady-state radiation embrittlement of reactor vessels, which consists of surveillance capsule supplemental testing and mechanistic studies, is being conducted by the Westinghouse Electric Corporation for the Electric Power Research Institute. A summary of the increases in the 41-J (30-ft . lb) transition temperature exhibited by submerged arc weld material contained in eight supplemental surveillance capsules included in this investigation is presented. The data indicate that radiation damage for high-copper submerged arc welds does not saturate but does tend to show a very low rate of embrittlement at neutron fluences greater than ~1 x 1019 n/cm2. The data also indicate that radiation damage predictions based on U.S. Nuclear Regulatory Guide 1.99, Revision 1, are not realistic for fluences greater than ~1 x 1019 n/cm2, for most pressure vessel steels.
Book Synopsis Irradiation Effects in Reactor Pressure Vessel Steels by : CZ. Serpan
Download or read book Irradiation Effects in Reactor Pressure Vessel Steels written by CZ. Serpan and published by . This book was released on 1986 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The embrittling effect of neutron irradiation on reactor pressure vessel steel and welds has a significant impact on the regulation of reactors by the U.S. Nuclear Regulatory Commission (NRC). Because the NRC is concerned with the continuing integrity and safety of the reactor's primary system, the neutron-irradiation-induced loss of fracture toughness and ductility must be carefully documented, understood, and controlled to assure that despite such loss, there is always a sufficient reserve of toughness and ductility to preclude crack initiation and uncontrolled propagation in the unlikely event of an accident. Aspects of embrittlement important to the NRC, which are discussed herein, include prediction of the transition temperature and upper-shelf-energy levels at critical vessel locations for the setting of pressure-temperature limits, for analysis of accident loadings such as pressurized thermal shock, and for evaluation of flaws found in inspection. Also discussed are the use of embrittlement-related neutron dosimetry and evaluation of vessel annealing.
