Painting within BWR secondary containment

Conference · Wed Dec 31 23:00:00 EST 1986 · Trans. Am. Nucl. Soc.; (United States)

OSTI ID:6299554

Ward, A

Paint solvents deposited on charcoal adsorbers used in the standby gas treatment (SBGT) system can reduce the methyl iodide removal efficiency of the adsorbers. The U.S. Nuclear Regulatory Commission (NRC) has imposed regulations in the form of technical specifications in order to mitigate the consequences of potential charcoal adsorber poisoning. Specifically, Monticello Nuclear Generating Plant's technical specifications require that the filters be tested following painting, fire or chemical release in any ventilation zone communicating with the system while the system is operating that could contaminate the HEPA filters or charcoal adsorbers. A method has been developed to determine the maximum allowable painting rate within secondary containment such that the quantity of organic solvents in the building at any time is always less than that which could potentially reduce the charcoal adsorber removal efficiency below the technical specification limit of 90%. This method allows many types of paints to be used within containment, although maximum allowable painting rates will decrease for paints with high quantities of hydrocarbon solvents or slow drying times. Controls in the form of a painting procedure have been put in place to ensure the analysis remains valid during all painting projects. Strict control over painting within secondary containment will ensure the integrity of the charcoal adsorbers and thus enhance the safe operation of the plant.

• Research Organization: Monticello Nuclear Generating Plant, Monticello, MN (US)
• OSTI ID: 6299554
• Report Number(s): CONF-870837-
• Journal Information: Trans. Am. Nucl. Soc.; (United States), Journal Name: Trans. Am. Nucl. Soc.; (United States) Vol. 54:1; ISSN TANSA
• Country of Publication: United States
• Language: English

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