Nuclear Criticality Safety

DOE-STD-3024-98

radiation exposures to personnel to ALARA. In

prominent aspects (such as guards surrounding

general, ALARA goals are achieved (or

rotating machinery) or those that were part of the

implemented) on a cost-beneficial basis, as

basis for selecting the particular equipment from a

contrasted with numerical radiation exposure limits

vendor should be identified. This subsection

that must be met regardless of cost.

provides the information that would help preclude

potential future modifications that might

This section should also address those requirements

compromise features important to protecting

(and bases) that might exist to protect sensitive

employees.

components from radiation exposure or to minimize

radiological contamination. Monitoring equipment

3.2.5 Operating Environment and Natural

and alarms should also be addressed.

Phenomena

This section should include only information that is

This subsection shall identify requirements (and

specifically related to the system being described;

their bases) related to the normal environment that

general information about the facility radiation

the system must be capable of operating under, for

control program or ALARA program should not be

example, ambient temperature, humidity, altitude,

repeated here.

noise, radiation, electromagnetic or radio frequency

interference (EMI/RFI) and vibration.

3.2.3 Nuclear Criticality Safety

This section shall also address abnormal and

This subsection shall identify those requirements

accident environments, consistent with the hazards

(and bases) that might exist related to design

analysis and accident analysis. This section should

features to prevent an inadvertent nuclear criticality.

be limited to environmental conditions that go

An example would be critical dimensions on the size

beyond typical design requirements such as those

and shape of pipes, tanks, or other containers. This

found in the Uniform Building Code. This section

subsection should also reflect things that

should address extraordinary design requirements

intentionally are not present, such as sources of

for protection from natural phenomena such as

water that have been routed so as not to be overhead

tornadoes, floods, or seismic events. For example,

or in the immediate vicinity.

if the system must operate during or following an

earthquake, the associated acceleration spectra

Non-design, operational (or administrative) aspects

should be identified.

of the nuclear criticality safety program that apply

to this system, such as the use of materials/contents

3.2.6 Human Interface Requirements

placards, should be addressed under Safety

Management Programs in Section 4.

This subsection shall identify the requirements (and

bases) that may exist related to the design of the

system to enhance the interface between the system

3.2.4 Industrial Hazards

and the human operator.

This subsection shall identify requirements for

safety features for hazards that are typically

This section shall identify any design requirements

accepted at commercial industrial workplaces. This

for alarms intended to trigger manual safety actions.

subsection shall identify Environmental, Safety, and

The basis for such a requirement should include a

Health (ES&H) requirements pertaining to the

summary of the conditions that are intended to

system being described related to personnel safety

generate the alarm (the meaning or significance of

and OSHA considerations.

the condition) and a brief summary of the actions

that need to be taken manually in response to the

This subsection is not intended to generate a

alarm.

research project to identify all the features of a piece

of equipment that may be related to the safety of

Requirements for alarms that are related to non-

personnel operating the equipment. However,

safety actions should be similarly described.

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