Evaluation of Commercial Production A533-B Plates and Weld Deposits Tailored for Improved Radiation Embrittlement Resistance

Hawthorne, J.R.; Koziol, J.J.; Groeschel, RC

doi:10.1520/stp33679s

Cited by 9 publications

(5 citation statements)

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“…The 168-hour heat treatment did not achiev e significant recovery in C,, 41-J (30 ft-lb) transition temperature and produced only limited recovery in the C, ,, 68-J (50 ft-lb) temperature. A high degree of recovery was not expected , however, in view of similar results for the Series 2 materials [4]. In contrast a 399°C (750° F) 168-hour postirradiation heat treatment produced almost full recovery for plate 5 (Fig.…”

Section: Postirradiation Annealed Conditionmentioning

confidence: 52%

“…Findings for the Series 1 vs Series 2 materials have been reported [4]. The results clearly demonstrate that a major reduction in radiation sensitivity is achieved by a reduced copper content in commercial production A533 plate , weld , and weld HAZ materials.…”

Section: Evaluation Of Commercial Production A533-b Steel Plates and mentioning

confidence: 66%

“…As described in the initial report [4] , the program plan centered on the evaluation of C,, notch ductility before and after irradiation at 288°C (550°F) to two fluenc e levels: 2 to 3 X iO~~ n/cm 2 > 1 MeV and 4 to 5 X 10~~ n/cm 2 > 1 MeV (Table 1). Resistance to radiation exposure was to be jud ged in terms of the increase in C v transition temperature, indexed to C~, 41-J (30 ft-lb) and C v 68-J (50 ft-lb) energy levels, and in terms of the decrease in C v upper-shelf energy level.…”

Section: Modified Program Planmentioning

confidence: 99%

“…The data in question pertain largely to high copper (>0.20%Cu) weidments of A533-B steel. One interpretat ion of the data (NRL) was a reinforcement by nickel of the primary copper effect rather than an independent contribution of nickel to radiation sensitivity for amounts up to 1%Ni [1,4,5]; that is, an independent effect of nickel was considered unlikely. An indepe ndent effect of nickel for amounts in this range , on the other hand , has been projected by other investigators.…”

Section: Nflu Ence Of Weld Deposit Nickel Contentmentioning

confidence: 99%

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Evaluation of Commercial Production A533-B Steel Plates and Weld Deposits with Extra-Low Copper Content for Radiation Resistance

Hawthorne

Koziol

Byrne

1979

Effects of Radiation on Structural Materials

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A cooperative research program by the U.S. Nuclear Regulatory Commission (NRC), Combustion Engineering, Inc., (CE), and the Naval Research Laboratory (NRL) has explored trends in radiation effects for commercially produced ASTM A533-B steel plates, weld deposits, and weld heat-affected zones, depicting three levels of control over impurity copper content. The primary objective was to establish the trend of improved 288°C (550°F) radiation resistance with progressive reductions in allowable copper content. An overall objective was to develop information assisting the formulation of special specifications for steels for nuclear service and the delineation of associated embrittlement trends for reactor vessel design and operation. This report describes investigations on Series 3 materials, which represent optimum steelmaking practice, and a limitation on copper content of 0.06 percent copper maximum. Radiation resistance was assessed from Charpy-V (Cv) notch ductility changes with fluences of ∼5 to 7 × 1019 neutrons (n)/cm2 > 1 MeV. All Series 3 materials exhibited high resistance to radiation in terms of both transition temperature elevation and upper-shelf degradation. Typically, the postirradiation C v 41 J (30 ft-lb) transition temperature elevation was less than 56°C (100°F). An independent effect of nickel content on radiation resistance was not observed for weld metal containing a high nickel content (≈ 1 percent nickel) and an extra-low copper content (0.05 percent copper). Comparisons of Series 3 and Series 2 data trends revealed that the specification of an extra-low copper content (0.06 percent copper maximum) as opposed to a low copper content (0.10 percent copper maximum) does not provide a substantial increase in radiation resistance for A533-B materials for the fluence range investigated. Accordingly, the study has confirmed that new ASTM and American Welding Society (AWS) supplemental specifications on copper content for nuclear service are sufficiently restrictive to optimize 288°C (550°F) radiation resistance of A533 plates and weld deposits for most projected vessel fluence conditions.

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Section: Postirradiation Annealed Conditionmentioning

confidence: 52%

Section: Evaluation Of Commercial Production A533-b Steel Plates and mentioning

confidence: 66%

Section: Modified Program Planmentioning

confidence: 99%

Section: Nflu Ence Of Weld Deposit Nickel Contentmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Commercial Production A533-B Steel Plates and Weld Deposits with Extra-Low Copper Content for Radiation Resistance

Hawthorne

Koziol

Byrne

1979

Effects of Radiation on Structural Materials

Self Cite

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show abstract

“…Overall therefore, by proposing vacancy contributions from both damage components, radiation assisted recovery of cold-work is expected to take place over a broad temperature range from -200° to >400°C, and this is in This irradiation environment can give rise to significant changes in the mechanical properties of these steels (Steele, 1975;Nichols and Cowan, 1971;Little, 1976), such as an increase the yield strength (irradiation hardening) and the ductile-to-brittle transition temperature (radiation embrittlement). These phenomena are known to be associated with the presence of residual levels (~0.1-0.35%) of copper in the steels (Hawthorne et al, 1975 andSmidt and Sprague, 1973), although the mechanism is not well understood.…”

Section: Precipitate Dissolution Under Irradiationmentioning

confidence: 99%