Modular radiation shielding system
A modular radiation shielding system for use on the lower side of a nuclear steam generator tubesheet to protect inspection and repair workers in the primary head of the generator from radiation of the tubesheet and tubes it secures, is described comprising: modular panels of lead shielding of like geometric shape, each having a transverse opening for alignment with a tube and being symmetrical about one axis and asymmetrical about a second axis perpendicular thereto so that if a previously plugged tube is encountered, a quick 180/sup 0/ rotation aligns the transverse opening in register with another tube; means for protecting the modular panels of lead shielding of like geometric shape from damage by external forces and from producing unwanted lead deposits in the steam generator; means for protecting the modular panels defining for each such panel, a sheath of material harder than lead having at least one opening transverse to the panel and in register with the transverse opening of the panel at a location at which the distance from the centers of the transverse openings in register and aligned with a tube in the tubesheet to the edge of the geometric shape places the edge in register with tubesheet material between tubes; and means extending through the transverse openings in register and aligned with a tube in the tubesheet for releasably fastening the modular panel to the tubesheet.
- Assignee:
- Combustion Engineering, Inc., Windsor, CT
- Patent Number(s):
- US 4729869
- Application Number:
- TRN: 88-018943
- OSTI ID:
- 5150459
- Resource Relation:
- Patent File Date: Filed date 4 Aug 1986
- Country of Publication:
- United States
- Language:
- English
Similar Records
Modular exhaust gas steam generator with common boiler casing
Solar energy focusing means comprising modular elements
Related Subjects
NUCLEAR POWER PLANTS
RADIATION PROTECTION
SHIELDS
DESIGN
STEAM GENERATORS
FABRICATION
LEAD
MODULAR STRUCTURES
OCCUPATIONAL SAFETY
OPERATION
REACTOR COMPONENTS
REACTOR SAFETY
BOILERS
ELEMENTS
METALS
NUCLEAR FACILITIES
POWER PLANTS
SAFETY
THERMAL POWER PLANTS
VAPOR GENERATORS
220900* - Nuclear Reactor Technology- Reactor Safety