Spent Filter Cartridge Replacement System for AP1000

Abstract

The Westinghouse AP 1000 reactor design incorporates filtration capabilities for its Spent Fuel Cooling, Chemical & Volume Control, and it’s Solid & Liquid Radwaste Systems. Filtration is provided using replaceable cartridges with replacement schedules varying from 3 – 18 months, and a predicted maximum spent cartridge dose rate of up to 500 rem/hr.

The filter vessels are housed in shield boxes embedded in the concrete floors at eight locations and three elevations within the reactor auxiliary and containment buildings.

To enhance the operability of the AP1000, Westinghouse has developed a system which can be deployed at any AP1000 site to safely and effectively remove and replace these irradiated filter elements as part of regular scheduled maintenance activities.

The heart of the system is a self-powered pendant controlled Handling and Transportation Cart which serves as both a material handling system for filter replacements as well as a transportation vehicle to maneuver through constricted passageways within the plant, to deliver spend cartridges to an onsite filter disposal area.

Integral to this system is a shielded filter cask with its own motive power and integral hoist system to retrieve and contain spent filter cartridges while providing a protective radiation shield and a liquid-tight seal against potential filter contaminates.