Hazards Mitigation

DOE-HDBK-1132-99

documented. The review and field investigation that removes ALL power

needs to ensure the safe removal of electrical equipment and wiring systems.

Hazards Mitigation.

2.13.3

Criticality Prevention . One technique that can minimize the impact of the

large inventory uncertainty would be to integrate characterization data and

work plans to keep the " ffected"inventory less than some predetermined

value by scheduling sections of the building, systems, or components to be

worked at the varying times and ensuring that waste packaging and

segregation and even waste storage schemes include criticality reviews.

Portable neutron or alpha instrumentation and in-process active/passive

neutron interrogation technologies should be added as needed to give real-

time updated information of the inventory as the project or operation proceeds.

A significant technical issue that should be addressed for every waste package

or configuration is the way the package density or detector/target geometry

affects any neutron measurement.

Electrical Power. The use of a construction-type power system to support the

decommissioning work should always be considered for anything but the

simplest project. The elimination of ALL power from a structure, except that

which is specifically brought in on a temporary basis, greatly reduces the

chances of inadvertent encounters with live electrical equipment. These

temporary systems should be sized to meet the need, colored to stand out, and

built to withstand the harsh environment (rain, snow, wind, and falling objects)

encountered on a demolition site.

Power or energy for cleanup operations should fit the particular activity.

Cleanup work is generally the primary energy source generating an airborne

condition. Where loss of power could result in unacceptable releases,

consideration should be given to backup power or design of the confinement

system to include a passive confinement mode sufficient to reduce releases to

acceptable levels when combined with work stoppage. Warning or alarm

systems should be included to ensure work stoppage upon loss of active

ventilation.

I-139