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首页> 外文会议>International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors >RESULT FROM SYTEMATIC COMPILATION OF BARREL BOLT FINDINGS IN S/KWU TYPE PWRs IN THE CONTEXT OF COMPUTATIONAL ANALYSIS AND LABORATORY RESULTS GAINED FROM COLD WORKED TYPE 316Ti UNDER SIMULATED PWR PRIMARY ENVIRONMENT
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RESULT FROM SYTEMATIC COMPILATION OF BARREL BOLT FINDINGS IN S/KWU TYPE PWRs IN THE CONTEXT OF COMPUTATIONAL ANALYSIS AND LABORATORY RESULTS GAINED FROM COLD WORKED TYPE 316Ti UNDER SIMULATED PWR PRIMARY ENVIRONMENT

机译：在计算分析中，在S / KWU型PWR中的桶螺栓调查结果中的桶螺栓调查结果在模拟PWR初级环境下从冷工作316TI中获得的计算分析和实验室结果

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Beginning with 2005 intergranular stress corrosion cracking (IGSCC) of barrel bolts made from cold worked type 316Ti (German Material No. 1.4571 K) was observed in several S/KWU type PWRs. This mechanism was not understood for PWR primary conditions. Therefore an extended joint research program was launched by AREVA GmbH and VGB e.V. to clarify the specific conditions which contributed to the observed findings on barrel bolts. A systematic analysis of the SCC affecting parameters as material, environment and mechanical load was performed based on a plant data compilation from all six S/KWU PWRs with comparable core barrel design using barrel and baffle bolts made from type 316Ti. Using the outcome of this systematic data compilation additional computational fluid dynamics calculations in combination with radiolysis calculations came to the result, that by a combination of reduced volume exchange by local flow conditions and radiolysis reactions forming oxidizing species as dissolved oxygen and/or hydrogen peroxide may locally affect the corrosion behavior of cold worked austenitic stainless steels. Hence, small local volumes with oxidizing water chemistry conditions are assumed to lead to the IGSCC of cold worked type 316Ti, since the comparison of the initial cold worked microstructure by TEM (void formation, dislocation loop density, etc.) with the cold worked and in service irradiated microstructure clearly reveal that neutron irradiation hardening in terms of IASCC is not the leading mechanism for these cases of barrel bolt cracking in the analyzed PWRs. Beside this data compilation analysis, additional laboratory tests on the general cracking behavior of cold worked type 316Ti material, which followed the same production line as for barrel bolt manufacturing in the 1980ies, with different cold work levels covering up to 30% were performed to determine whether there is a specific susceptibility of cold worked austenitic stainless steel specimens to suffer IGSCC under simulated PWR primary conditions. All these tests on tapered specimens came to the results that i) much higher cold work levels than used for the existing barrel bolts are needed for IGSCC initiation, ii) additional high active plastic deformation is needed to generate and propagate intergranular cracking, iii) all specimens finally showed ductile fracture at the applied strain rates.
机译：从2005年开始，在几种S / KWU型PWR中观察到由冷加工型316Ti（德国材料No.1.4571 K）制成的枪管螺栓的晶体应力腐蚀开裂（IGSCC）。对于PWR初级条件，不明白这种机制。因此，由AREVA GmbH和VGB E.V启动了扩展的联合研究计划。澄清对桶螺栓上观察到的发现有助于贡献的具体条件。影响的参数为材料，环境负荷和机械负荷的SCC的系统分析进行基于从利用从类型316TI制成筒和挡板螺栓所有六个S / KWU压水堆具有可比芯筒设计的植物数据汇编。利用该系统数据编译的结果额外的计算流体动力学计算与放射性分析的组合实现了结果，通过局部流动条件减少的体积交换和形成氧化物质作为溶解氧和/或过氧化氢的放射性反应的组合局部影响冷加工奥氏体不锈钢的腐蚀行为。因此，假设具有氧化水化学条件的小局部体积，以导致冷加工型316Ti的IGSCC，因为初始冷的工作组织通过TEM（空隙形成，位错环密度等）与冷的工作和寒冷的工作在辐照微观结构中清楚地揭示了IASCC中的中子辐射硬化不是分析的PWR中这些桶形螺栓裂纹的前导机制。除此之外，还对1980年代的桶形螺栓制造的冷加工316Ti材料的一般开裂行为的额外实验室测试，如1980年代，覆盖多达30％的不同冷水工作水平以确定在模拟PWR初级条件下是否存在冷轧奥氏体不锈钢试样的特定易感性，在模拟PWR初级条件下遭受IGSCC。锥形标本上的所有这些测试结果是i）对于IGSCC启动所需的，I）需要比用于现有的桶螺栓的冷水水平更高，II）需要额外的高活性塑性变形来产生和传播晶间裂缝，III）所有标本最终显示出应用应变率的延性骨折。

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