Clad restoration

Back Cladding A localized WOL operation between two integrally clad or weld overlayed sections. This process is also known as clad restoration . 

One of the most important applications for impact-modified PP is automotive TPO, commonly used for automotive bumper fascia, external body cladding, and interior trim. Compounds are typically three-component blends of ICP with talc and an impact modifier such as a metallocene plastomer or EPR. The impact modifier provides low temperature toughness but softens the matrix. The talc particles restore the stiffness of the compound but detract from impact strength. The objective of TPO compounding is to select the combination of the three components that provides an optimum balance of stiffness and impact strength. 

To restore and maintain, if necessary, the water level in the reactor vessel after a LOCA so that the core is sufficiently cooled to prevent fuel cladding damage (fragmentation)... 

Zirconium weld metal may corrode preferentially when H2SO4 concentration is approximately 55% and higher. Heat treatment at 775 + 15°C for 1 h per 25.4 mm of thickness can be applied to restore the corrosion resistance approaching that of the parent metal. However, this high-temperature heat treatment is not suitable for equipment made of zirconium/steel-clad materials because of the large difference in thermal expansion coefficients between these two alloys. Heat treatment at a much lower temperature, such as 510 + 20°C, should be applied when there is... 

Whilst the exact cause was never established, two small pieces of graphite sleeve, of a type different from that in the channel, had probably been lodged in the channel entry. This would have restricted the gas flow through the channel, and the fuel element would have become hot enough to melt the magnesium cladding. Even when the channel had been cleared, decontaminating the reactor took a very considerable time, so that it was not until June 1969, just over two years later, that the reactor was restored to full power. 

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