Structural - hdbk60040108

DOE-HDBK-6004-99

Structural

General

Remote handling systems and components encompass all components up to the primary plant support

structures. The design allowables for safety-class or safety-significant remote handling systems and

components should be in accordance with codes identified in Table 2 of this volume.

Normal Loads

Remote handling systems should withstand the static, dynamic, thermal, and normal plant loads,

without exceeding applicable code allowable stresses.

Natural Phenomena and Accident Loads

Safety-class remote handling systems should be designed to withstand effects of natural phenomena

and design basis accidents. Loads from natural phenomena and accidents should not cause safety-

significant remote handling systems and components to fail in such a manner as to cause failure of

safety-class components or systems.

Materials

Materials of construction should be qualified for the life time service with the anticipated thermal and

radiation environment. The structural design analyses should use conservative end of life properties.

If a component's expected life time is less than the fusion facility life time, design should provide for

component replacement. Additionally, the minimization of material activation and the ability to

decontaminate materials should be considered. The nature of a fusion facility is such that very high

levels of radiation, temperature, magnetic flux, and neutron flux are expected. Additionally, the

presence of hydrogen, deuterium, and tritium gases is anticipated during off normal events.

The effects of galvanic or chemical corrosion should be evaluated as part of the material selection

process.

Materials used in the fabrication of remote handling equipment load bearing members should conform

to standards defining chemical and mechanical properties specified by the designer. Allowable

stresses in remote handling equipment structural steel members during normal operation should not

exceed those codes identified in Table 2, and allowable design stresses in mechanical components

should provide a factor of safety of 5 when under rated load. Brittle fracture and fatigue during all

operation and testing conditions should be design considerations.

Joint and weld details should be designed to prevent fracture, lamellar tearing, low-cycle fatigue and

embrittlement.

Lubricants, sealants and protective coatings should be compatible with their intended service and

environment.

In the selection of materials, including lubricants, sealants and electrical insulation for equipment to

be stored or used in the primary confinement, design life radiation exposure (during normal operation