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In Sweden a qualitative risk oriented approach was introduced in 1987 for piping and other components in the piping system. After a transition period of five years it become mandatory in 1992. It was also extended to all components and parts thereof, except reactor pressure vessels and some steam generator parts. For the reactor pressure vessel and for steam generator tubes special rules still apply. As in Spain these risk-oriented programmes include previous augmented inspection programmes. 5.

Through-wall cracks or flaws are the most difficult to detect and monitor because they can occur at any RCPB location. This type of leak is also of most concern because the leak may develop from some unpredicted combination of internal defects and external stresses in a non-isolatable portion of the RCPB. g. pump seal or valve packing leakages. The intent is to avoid identifiable leaks and provide measures for a most sensitive monitoring of unidentified leaks. 03-1982 at least three dissimilar, diverse, and independent principal methods of monitoring coolant leakage from the RCPB to the containment shall be provided.

The important parameters are the boric acid, lithium hydroxide and hydrogen concentrations, and the resulting pH level. 4. The boric acid concentration is decreased along a reactor cycle and start at a relatively high level (1000 to 2500 ppm). The lithium hydroxide is co-ordinated with the boric acid concentration to achieve the desired pH. 8 to 4 ppm, and then is reduced with the boron concentration reduces. Hydrogen is added to the primary coolant with typical concentration of 25 to 50 cm3/kg.

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