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DOE-HDBK-6004-99
additional guidance for design of confinement barriers. RG 1.140 provides guidance for design,
testing and maintenance for tritium removal systems.
Segmented Tritium Systems
Tritium systems design should provide for segmentation of the tritium inventory to make acceptable
the amount of tritium releasable in a single event. Design should provide for isolation of each
segmented volume using valves or piping blanks. Check valves and other one-way valves are not
acceptable as isolation devices.
Release of tritium from the single largest segmented volume should not result in exceeding prescribed
dose limits or other unacceptable consequences.
Segmentation may be accomplished by either
1. Utilization of processes or devices with small inventory, or
2. Separation of the tritium inventory into isolable volumes, or
3. Storage of tritium in an immobile condition relative to the single event (e.g., metal hydride beds).
Protection For Natural Phenomena
For the tritium systems that are safety class, including structures and components, design should
provide robustness to withstand the effects of design basis natural phenomena such as earthquake,
tornado, hurricane, flood tsunami, seiche, etc., without loss of safety function. The design should
also provide for protection of safety-class equipment and systems from potential failure of non-safety-
class hardware during natural phenomena events. If protection includes isolation of safety-class
systems, the equipment, instruments and electrical systems that provide for the isolation should be
capable of withstanding the effects of design basis natural phenomena without failure of function and
should be fail-safe in the event of power loss or failure within electrical systems.
Protection from Environmental Conditions and Missiles
For the tritium systems, including structures and components, that are safety class, design should
provide robustness to accommodate the effects of environmental conditions of normal operations,
maintenance, testing and postulated accidents without loss of safety function. Safety-class tritium
systems should have robustness or protection to withstand dynamic effects of a missile, pipe whip,
or runaway plasma that may result from equipment failures and from events outside the tritium
systems if the safety analysis evaluates these as design basis accidents.
Fire Protection
The design should minimize the probability and consequences of tritium fires or explosions. Because
fire oxidizes elemental tritium to tritium oxide, a form with a much greater biological hazard, design
should place high priority on preventing fires. The design should use noncombustible or fire resistant
materials to the greatest practical extent throughout the tritium systems.
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