Maintaining the structural integrity of materials in nuclear power plants is an essential issue associated with safe operation. Hydrogen (H₂) addition or injection to coolants is a powerful technique that has been widely applied such that the reducing conditions in the coolant water avoid corrosion and stress corrosion cracking (SCC). Because the radiation-induced reaction of ˙OH + H₂ → H˙ + H₂O plays a crucial role in these systems, the rate constant has been measured at operation temperatures of the reactors (285–300 °C) by pulse radiolysis, generating sufficient data for analysis. The reverse reaction H˙ + H₂O → ˙OH + H₂ is negligibly slow at ambient temperature; however, it accelerates considerably quickly at elevated temperatures. Although the reverse reaction reduces the effectiveness of H₂ addition, reliable rate constants have not yet been measured. In this study, the rate constants have been determined in a temperature range of 250–350 °C by pulse radiolysis in an aqueous I⁻ solution.

中文翻译：

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H + + H ₂ O→OH + H ₂反应的速率常数，在升高的温度下通过脉冲辐解测量

维护核电厂中材料的结构完整性是与安全运行相关的重要问题。向冷却剂中添加或注入氢（H ₂）是一项功能强大的技术，已广泛应用，以使冷却剂水中的还原条件避免腐蚀和应力腐蚀开裂（SCC）。由于˙OH+ H ₂ →H˙+ H ₂ O的辐射诱导反应在这些系统中起关键作用，因此已通过脉冲辐射分解法在反应器的工作温度（285–300°C）下测量了速率常数，生成足够的数据进行分析。逆反应H˙+ H ₂ O→˙OH+ H ₂在环境温度下缓慢到可以忽略不计；但是，它在高温下会迅速加速。尽管逆反应降低了H ₂添加的有效性，但尚未测量出可靠的速率常数。在这项研究中，速率常数已在温度范围250-350℃下，在水性我确定通过脉冲辐^-溶液。