NUREG-1537, Part 2 - NRC

9 AUXILIARY SYSTEMS
This chapter contains guidance for evaluating the information on auxiliary systems
in the reactor facility. Auxiliary systems are those systems not fully described in
other chapters of the SAR that are important to the safe operation and shutdown
of the reactor and to the protection of the health and safety of the public, the
facility staffi and the environment. There are also auxiliary systems or subsystems
that do not have a direct impact on protecting the reactor or the public from
exposure to radiation. However, for all auxiliary systems at a non-power reactor,
sufficient information should be provided so that the reviewer can understand their
design and functions. Emphasis should be placed on those aspects of auxiliary
systems that might affect the reactor, its safety features, and its safe shutdown, or
contribute to the control of radioactivity and radiation exposures.
The design, operation, and use of non-power reactors vary widely, resulting in a
wide variety of auxiliary systems. The applicant should discuss the capability of
each auxiliary system to function as designed without compromising the safe
operation or shutdown of the reactor facility under the range of operational
conditions. Any functions of auxiliary systems required during analyzed reactor
accidents also should be discussed. The information the applicant should provide
in this chapter of the SAR for each auxiliary system is given at the beginning of
Chapter 9 of the format and content guide; The typical auxiliary systems listed
there are not intended to be a complete list of auxiliary systems to be discussed in
this chapter of the SAR. The reviewer should be aware that some auxiliary
systems could be discussed in more than one chapter. The following sections
contain guidance pertaining to the five items listed at the beginning of Chapter 9 of
the format and content guide for the systems discussed in Sections 9.1 to 9.7 of the
guide.
9.1 Heating, Ventilation, and Air Conditioning Systems
Areas of Review
At non-power reactors, the heating, ventilation, and air conditioning (HVAC)
systems are designed to provide conditioned air for an acceptable working
environment for personnel and equipment. The areas of review for this section
include HVAC system operating characteristics'for the fIll range 'of reactor
operation., In many non-power reactors, the HVAC systems are also designed to
limit concentrations and prevent the uncontrolled release of airborne radioactive
material to the unrestricted environment. Any operating modes or functions
designed to mitigate the consequences of accidents should be discussed in
Chapter 6, Engineered Safety Features," ofthe SARL Radiological exposures to
airborne radioactive material that result from the full range 'of reactor operations
should be analyzed in detail in Chapter 11, "Radiation Protection Program and
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