POWER February 2017 - 19

3. Systems Scaffold. The design utilizes unique 360-degree ring
sets spaced 21 inches apart, allowing up to eight horizontal members
to attach securely. Courtesy: Safway Group
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dards for Protection Against Radiation, " establishes the dose limits
for radiation workers. Although the limits vary, depending on
the affected part of the body, the annual total effective dose
equivalent for the whole body is 5 rem. Often, a facility's general
(or maintenance) contractor works with a scaffold supplier
that can provide the necessary support services to complete work
safely and efficiently, thereby minimizing dose.
Choosing a Scaffold
The two most common types of scaffold used in power plants
are Systems Scaffold (which offers fast erection and the versatility
of 360-degree placement on the vertical post ring sets) and
tube-and-clamp scaffold (a highly adaptable system that can be
erected and dismantled easily).
Systems Scaffold (Figure 3) has passed all seismic qualification
tests of Class 1E equipment, meaning that the scaffold is in full
compliance with American National Standards Institute (ANSI)
requirements and the Institute of Electrical and Electronics Engineers
(IEEE) Standard 344-1987. During testing performed in
May 2010, equipment performed satisfactorily with no damage
or dislodging of diagonals, toeboards, or planks. Tube-and-clamp
and other scaffold can also pass seismic tests, but Systems Scaffold
has been tested to greater extremes.
Systems Scaffold is the preferred choice for work in most areas
of a power plant, because it erects and dismantles quickly. However,
the geometry of post ring sets and end connectors makes
decontamination more complicated. If scaffolding will be dismantled
and brought back out of an RCA, tube-and-clamp is usually
the preferred choice because its simplicity makes it the easiest to
decontaminate-the surface areas of all components are easily
accessible.
Because of tube-and-clamp's nearly unlimited adaptability,
contractors also often select it for semi-permanent residence
in RCAs. Once installed, it can meet almost any access need. It
is also the lowest component cost option. In addition to the
standard 2-inch-wide clamp (Figure 4), 4-inch-wide military ( " fat
clamps " ) are available, which meet or exceed U.S. Navy specification
MIL-S-29180.
February 2017 | POWER
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19
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POWER February 2017

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