Safety-Related Design Standards and Criteria

DOE-HDBK-6004-99

SAFETY-RELATED DESIGN STANDARDS AND CRITERIA

If the vacuum vessel system or individual components are designated safety-class the following design

standards should apply to the system or components:

Structural

The vacuum vessel system boundary should be defined as the vacuum vessel proper including

attached windows, flanges, and ports and all penetrations up to and including the first isolation valve

in system piping which penetrates the vacuum vessel.

Loads

Individual Loads

The vacuum vessel should be designed to withstand the static load, normal operating pressure, normal

operating thermal load, electromagnetic loads (normal operating and fault), disruption/vertical

displacement (VDE) loads, interaction loads from adjacent systems, and transient loads due to design

basis accidents such as natural phenomena, loss-of-coolant into the vessel and subsequent chemical

reactions, site-generated missile impacts, and hydrogen detonation. (These design basis accidents are

for example only, since some of them may not be credible for a particular facility.)

Static Load

The static load should include the weight of the vacuum vessel and all supported hardware.

Normal Operating Pressure

The normal operating pressure of the vacuum vessel may be one of the following:

1. 1 atmosphere internal pressure,

2. 1 atmosphere external pressure,

3. No net pressure.

If the vacuum vessel is double-walled with a coolant in the annulus, the maximum coolant pressure

should be the normal operating pressure in the annulus.

Normal Operating Thermal Load

The normal operating thermal load should include transient thermal loads during pulsed operation as

well as the temperature distribution during bakeout and wall conditioning.