ASTM D5411-10(2015)
计算反应堆冷却剂中放射性核素混合物的每次衰变 (&xaf;E) 平均能量的标准实施规程

Standard Practice for Calculation of Average Energy Per Disintegration (&xaf;E) for a Mixture of Radionuclides in Reactor Coolant

被代替

ASTM D5411-10(2015) 发布历史

ASTM D5411-10(2015)由美国材料与试验协会 US-ASTM 发布于 2010。

ASTM D5411-10(2015) 发布之时，引用了标准

• ASTM D1066 蒸汽取样的标准做法
• ASTM D1129 与水相关的标准术语
• ASTM D3370 封闭管道取水的标准做法
• ASTM D3648 放射性物质测量的标准实施规范
• ASTM D7282 放射性测量用仪器的设置、校准和质量控制的标准实施规程

ASTM D5411-10(2015)的历代版本如下：

• 2021年 ASTM D5411-21 反应堆冷却剂中放射性核素混合物每次崩解平均能量计算的标准实施规程
• 2010年 ASTM D5411-10(2015) 计算反应堆冷却剂中放射性核素混合物的每次衰变 (&xaf;E) 平均能量的标准实施规程
• 2010年 ASTM D5411-10 反应堆冷却剂中放射性核素混合物每次蜕变的平均能量(E)计算的标准操作规程
• 2005年 ASTM D5411-05 反应堆冷却剂中放射性核素混合物每次蜕变的平均能量(E)计算的标准规范
• 1993年 ASTM D5411-93(2005)e1 反应堆冷却剂中放射性核素混合物每次蜕变的平均能量(E)计算的标准规范
• 1993年 ASTM D5411-93(1999) 反应堆冷却剂中放射性核素混合物中每次裂变的平均能量的标准计算规程

 

5.1 This practice is useful for the determination of the average energy per disintegration of the isotopic mixture found in the reactor-coolant system of a nuclear reactor (1).4 The E value is used to calculate a site-specific activity limit for the reactor coolant system, generally identified as

where K   =   a power reactor site specific constant (usually in the range of 50 to 200). The activity of the reactor coolant system is routinely measured, then compared to the value of Alimiting. If the reactor coolant activity value is less than Alimiting then the 2-h radiation dose, measured at the plant boundary, will not exceed an appropriately small fraction of the Code of Federal Regulations, Title 10, part 100 dose guidelines. It is important to note that the measurement of the reactor coolant system radioactivity is determined at a set frequency by use of gamma spectrometry only. Thus the radionuclides that go into the calculation of E and subsequently Alimiting are only those that are calculated using gamma spectrometry.

5.2 In calculating E, the energy dissipated by beta particles (negatrons and positrons) and photons from nuclear decay of beta-gamma emitters. This accounting includes the energy released in the form of energy released from extra-nuclear transitions in the form of X-rays, Auger electrons, and conversion electrons. However, not all radionuclides present in a sample are included in the calculation of E.

5.3 Individual, nuclear reactor, technical specifications vary and each nuclear operator must be aware of limitations affecting their plant operation. Typically, radioiodines, radionuclides with half lives of less than 10 min (except those in equilibrium with the parent), and those radionuclides, identified using gamma spectrometry, with less than a 958201;% confidence level, are not typically included in the calculation. However, the technical requirements are that the reported activity must account for at least 958201;% of the activity after excluding radioiodines and short-lived radionuclides. There are individual bases for each exclusion.

5.3.1 Radioiodines are typically excluded from the calculation of E because United States commercial nuclear reactors are required to operate under a more conservative restriction of 1 μC (37 kBq) per gram dose equivalent 131I (DEI) in the reactor coolant.

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标准号

ASTM D5411-10(2015)

发布

2010年

发布单位

美国材料与试验协会

替代标准

ASTM D5411-21

当前最新

ASTM D5411-21

 

 

引用标准

ASTM D1066 ASTM D1129 ASTM D3370 ASTM D3648 ASTM D7282

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