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NRC proposes changes to its rules on nuclear materials
In response to Executive Order 14300, “Ordering the Reform of the Nuclear Regulatory Commission,” the NRC is proposing sweeping changes to its rules governing the use of nuclear materials that are widely used in industry, medicine, and research. The changes would amend NRC regulations for the licensing of nuclear byproduct material, some source material, and some special nuclear material.
As published in the May 18 Federal Register, the NRC is seeking public comment on this proposed rule and draft interim guidance until July 2.
Kazumi Asahi, Masao Kitamura, Eishi Ibe, Yamato Asakura, Shunsuke Uchida
Nuclear Science and Engineering | Volume 95 | Number 4 | April 1987 | Pages 257-265
Technical Paper | doi.org/10.13182/NSE87-A20437
Articles are hosted by Taylor and Francis Online.
Double oxide layers were observed on the stainless steel coupons. The outer layer consisted of well-developed crystals (diameter: 0.5 to 1.0 üm, probable major oxide form: NiO Fe2O3), while the inner layer consisted of smaller particles [diameter: 0.1 to 0.3 μm, probable major oxide form: NiO-(Cr,Fe)2O3]. The depletion of chromium and nickel and the accumulation of impurities in the water, such as 60Co, zinc, and copper, were observed in the outer layer. For the carbon steel the chromium-rich layer existed at the outer/inner interface. It was considered that the outer and inner layers were a corundum-type oxide (Cr,Fe)2O3. The outer layer seemed to be formed by a wet corrosion mechanism (dissolution-precipitation of metal), while the inner layer seemed to be formed by a dry corrosion one (reaction of metal with oxygen diffused through the oxide layers from the water). More than 80% of the 60Co in a coupon was included in the outer layer, and it was supposed that this was deposited mainly during wet corrosion.
