Microbiologically influenced corrosion of stainless steel tubing and piping in the service water system at North Anna Nuclear Power Station

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:400861

Melnik, J L; Rasnic, R L; Bennetch, J I ^[1]

---

1. Virginia Power, Glen Allen, VA (United States)

Since original plant construction in the 1970`s, the carbon steel piping of the service water system (SWS) of Virginia Power`s North Anna Nuclear Power Station has experienced general corrosion and pitting due to microbiologically influenced corrosion (MIC). Corrosion of the carbon steel piping was combatted by the implementation of chemical treatment of the SWS and by repair/replacement of portions of the piping utilizing type 316L stainless steel (SS) on 10 in. and smaller piping and 100% solids epoxy coating on the rest of the piping. Only recently, in early 1994, MIC was discovered on the 18 gage 304 S welded tubes in the Component Cooling Heat Exchangers (CCHXs). Earlier, MIC was discovered on 316L SS pipe base metal adjacent to several socket weld locations on small diameter piping. This paper will concentrate on the Virginia Power action plan to combat further degradation due to MIC and to maintain operable SS piping and equipment with SS tubing which is exposed to service water.

• OSTI ID: 400861
• Report Number(s): CONF-950828--
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
AUXILIARY WATER SYSTEMS
BIOLOGICAL FOULING
CARBON STEELS
CORROSION
CORROSION INHIBITORS
CORROSION PROTECTION
HEAT EXCHANGERS
NORTH ANNA-1 REACTOR
NORTH ANNA-2 REACTOR
STAINLESS STEEL-304
STAINLESS STEEL-316L
TITANIUM
WATER CHEMISTRY
WELDED JOINTS