公开(公告)号：US5805653A

公开(公告)日：1998-09-08

申请号：US729020

申请日：1996-10-10

申请人： Samson Hettiarachchi ,  Robert Lee Cowan, II ,  Thomas Pompilio Diaz ,  Gary Paul Wozadlo

发明人： Samson Hettiarachchi ,  Robert Lee Cowan, II ,  Thomas Pompilio Diaz ,  Gary Paul Wozadlo

IPC分类号： G21D1/00 ,  B01J37/03 ,  C23F11/08 ,  C23F11/18 ,  C23F15/00 ,  G01N17/02 ,  G21C3/07 ,  G21C17/02 ,  G21C17/022 ,  G21C19/28 ,  G21C19/30 ,  G21C19/307 ,  G21D3/08 ,  G21C9/00

CPC分类号： G21C17/0225 ,  B01J37/031 ,  C23F11/08 ,  C23F11/18 ,  C23F15/00 ,  G01N17/02 ,  G21C17/02 ,  G21C19/28 ,  G21C19/30 ,  G21C19/307 ,  G21C3/07 ,  G21C17/022 ,  G21Y2002/102 ,  G21Y2002/103 ,  G21Y2002/104 ,  G21Y2002/204 ,  G21Y2004/10 ,  G21Y2004/20 ,  G21Y2004/30 ,  G21Y2004/40 ,  Y02E30/40

摘要： A method for mitigating crack growth on the surface of stainless steel or other metal components in a water-cooled nuclear reactor. A compound containing a noble metal, e.g., palladium, is injected into the water of the reactor in the form of a solution or suspension. This compound has the property that it decomposes under reactor thermal conditions to release ions/atoms of the noble metal which incorporate in or deposit on the interior surfaces of the crack. The compound may be organic, organometallic (e.g., palladium acetylacetonate) or inorganic in nature. The palladium deposited inside a crack should exhibit catalytic behavior even if the bulk surface palladium is depleted under high fluid flow conditions. As a result, the electrochemical potential inside the crack is decreased to a level below the critical potential to protect against intergranular stress corrosion cracking.

摘要翻译： 一种减轻水冷核反应堆不锈钢或其他金属部件表面裂纹扩展的方法。 将包含贵金属如钯的化合物以溶液或悬浮液的形式注入反应器的水中。 该化合物具有其在反应器热条件下分解以释放掺入或沉积在裂纹内表面上的贵金属的离子/原子的性质。 化合物可以是有机的，有机金属的（例如乙酰丙酮钯）或无机的。 即使在高流体流动条件下体表面钯耗尽，沉积在裂纹内的钯也应该具有催化作用。 因此，裂纹内部的电化学电位降低到临界电位以下以防止晶间应力腐蚀开裂。

公开(公告)号：US5883311A

公开(公告)日：1999-03-16

申请号：US667711

申请日：1996-06-21

申请人： Samson Hettiarachchi ,  Gary Paul Wozadlo

发明人： Samson Hettiarachchi ,  Gary Paul Wozadlo

IPC分类号： G01N3/00 ,  G01N3/02 ,  G01N3/06 ,  G01N3/32 ,  G01N19/08

CPC分类号： G01N17/006 ,  G01N17/02 ,  G01N3/066 ,  G01N3/32 ,  G01N2203/0064 ,  G01N2203/0218 ,  G01N2203/0222 ,  G01N2203/024 ,  G01N2203/0244 ,  G01N2203/0246

摘要： Methods and apparatus for detecting the onset of stress corrosion cracking are described. In one aspect, the present invention is a passive detector for in-situ detection of the onset of stress corrosion cracking in a nuclear reactor. The detector includes a ceramic insulator mounting member. A first material sample and a second material sample are secured to the mounting member. In the one embodiment, a metal bolt extends through the first and second material samples and secures the samples to the mounting member. The first material sample is cold worked to induce residual tensile stress and the second material is not cold worked. A first electrical conductor is electrically connected to the first material sample and a second electrical conductor is electrically connected to the second material sample. An electrometer is electrically connected to the first and second electrical conductors, and the electrometer is configured to generate a strain induced differential potential signal representative of a difference in potential between the first sample and the second sample. Alternatively, a strain induced differential current signal can be monitored using a zero resistance ammeter in place of the electrometer. The detector configured to be located within the reactor at the location where monitoring is desired, and during the reactor operation, if transients are observed in the differential signal, this condition indicates that at the location of the detector, an inspection should be performed at the next outage to determine whether cracking is occurring. Active detectors, detection methods, and test apparatus also are described.

摘要翻译： 描述了用于检测应力腐蚀开裂发生的方法和装置。 一方面，本发明是用于在核反应堆中原位检测应力腐蚀开裂的无源检测器。 检测器包括陶瓷绝缘体安装构件。 第一材料样品和第二材料样品固定到安装构件。 在一个实施例中，金属螺栓延伸穿过第一和第二材料样品并将样品固定到安装构件。 第一种材料样品被冷加工以引起残余拉伸应力，第二种材料不被冷加工。 第一电导体电连接到第一材料样品，第二电导体与第二材料样品电连接。 静电计电连接到第一和第二电导体，并且静电计被配置为产生代表第一样品和第二样品之间的电位差的应变感应差分电位信号。 或者，可以使用零电阻电流表代替静电计来监测应变感应差动电流信号。 检测器被配置为位于反应器内需要监测的位置处，并且在电抗器操作期间，如果在差动信号中观察到瞬变，则该条件指示在检测器的位置处应该在 下一次断电以确定是否发生裂纹。 还描述了主动检测器，检测方法和测试装置。