15.4.8 The MSLB and the FWLB

In spite of specific control program, two guillotine pipe breaks of feed water system piping have occurred in 1990 and 1993 at Unit 1 and Unit 2 of Loviisa NPP in Finland. These two pipe breaks and inspections performed have revealed that wall thinning can be very local in nature, and wall thinning of similar components in parallel lines can be completely different (Korhonen and Hietanen, 1994). After the first guillotine pipe break, the extent of control program was increased to comprise about 600 items to be inspected in each unit every year. This did not avoid the second guillotine break in 1993.

An MSLB constituted the topic of the first benchmark organized by OECD/NEA/NSC to demonstrate the capabilities of coupled ...

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