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Extra resources for Material Degradation and Related Managerial Issues at Nuclear Power Plants: Proceedings of a Technical Meeting held in Vienna 15–18 February 2005

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Hietanen Fortum Nuclear Services Ltd, FORTUM, Finland Abstract. The Loviisa Nuclear Power Plant owned by Fortum (by IVO until 1998) consists of two VVER 440 units dating back to the late '70s and the early '80s. A control programme was developed in 1982–1983 to manage erosion corrosion in the secondary system piping and components. The scope of the control programme was enlarged after the Surry accident in 1986 but still the control programme was based on the operation experience and two-phase flow conditions.

The source of the boric acid was via a through wall crack in a control rod drive mechanism nozzle (Figure 3). This crack was initiated as a result of Primary Water Stress Corrosion Cracking. The Davis-Besse organization believed that the boron accumulated on the RPV head was due to leaking control rod drive mechanism flanges above the RPV head and that such accumulation would not cause corrosion due to the elevated temperatures at that location. This boron accumulation on the top of the RPV head was not fully removed during refueling outages and it masked the typical “popcorn” boron indication from a nozzle containing a crack (see Figure 4).

There were no injuries of the personnel [4]. 42 Fig. 3. Location of the broken FW-discharge line Fig. 4. Exact location of the break. The exact location of the break in the discharge feed water line was in the flange immediately after the non-return valve, figure 4. There were most probably several reasons which caused rapid wall thinning in the broken flange, such as high turbulence caused by the feed water pump and adjacent components (T piece, non-return valve), additional connection piece (stainless steel for few years) between the non-return valve and the flange and quite low chromium content of the flange.

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