Steam generator chemical cleaning at the Palo Verde Nuclear Generating Station

Conference · Fri Sep 01 04:00:00 EDT 1995

OSTI ID:99559

Jevec, J M ^[1]; Knollmeyer, P M ^[2]; Paramithas, P ^[3]

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1. Babcock and Wilcox, Alliance, OH (United States). R and D Division
2. B and W Nuclear Technologies, Lynchburg, VA (United States)
3. Palo Verde Nuclear Generating Station, Tonopah, AZ (United States)

The secondary side of the Palo Verde Units 2 and 3 steam generators were chemically cleaned in 1994. The primary purpose of the chemical cleaning was to remove deposits bridging between adjacent tubes and also to remove bulk tube and tubesheet deposits. A secondary objective was to remove deposits from the flow distribution plate-to-tube crevice. The chemical cleaning consisted of a magnetite dissolution step, a separate step aimed at removing deposits in the flow distribution plate crevices, and a final step to remove residual copper and passivate the carbon steel surfaces of the steam generator. Corrosion monitoring was employed during the cleaning to ensure that the cleaning resulted in corrosion to steam generator materials of construction that was below the predetermined chemical cleaning corrosion allowances. The process application, removal efficiency, and corrosion results are presented in this paper.

• OSTI ID: 99559
• Report Number(s): CONF-950304--
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
CARBON STEELS
CLEANING
CORROSION
CORROSION INHIBITORS
CRACK PROPAGATION
CREVICE CORROSION
INTERGRANULAR CORROSION
PALO VERDE-2 REACTOR
PALO VERDE-3 REACTOR
PASSIVATION
SECONDARY COOLANT CIRCUITS
STEAM GENERATORS
STRESS CORROSION