Westinghouse Electric Corporation

John O Izzo

David M Evans

Ricky L Tucker

A shielded access door for a nuclear steam generator manway port having a beam of radiation streaming therethrough, the port being surrounded by a manway flange. The door comprises a bracket adapted to be removably connected to the flange. A plurality of swing arms have the first end portion thereof pivotally connected to the bracket. A first shield member is connected to the second end portions of the arms and is disposed parallel and adjacent to the port for shielding against the beam of radiation. The first shield member and the port define a gap therebetween for allowing access to the steam generator interiorly of the port while simultaneously shielding against the beam of radiation. The first shield member has a ventilation hole therethrough in communication with the port for ventilating the port, so that air-borne radioactive particles present interiorly of the steam generator are exhausted from the steam generator. A second shield member, which is attached to the first shield member, is coaxially aligned with the hole of the first shield member and is spaced-apart from the first shield member for preventing the beam of radiation from exiting through the ventilation hole. The second shield member is capable of being interposed between the beam of radiation and the hole for shielding the hole against the beam of radiation. Moreover, the first shield member is formed of light weight connectable segments to facilitate lifting and positioning of the door at the manway port.

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Pittsburgh, PA, United States of America

John O Izzo