Safety Structures, Systems, and Components

DOE-STD-6003-96

The facility description information must be an integral part of the safety analysis, but it is

possible to accomplish this by providing the information in nonsafety analysis sections of facility

documentation or even in totally separate documents, either of which would then be referenced

in the specific safety analysis discussions. The configuration control requirements applicable to

SARs would also apply to information referenced in the SARs but contained in other documents.

(See configuration control requirements of Chapter 4.)

5.1.2 Safety Structures, Systems, and Components

Safety structures, systems, and components (SSCs) implement the safety functions

associated with a facility. The two categories of safety functions associated with fusion facilities

are (1) public safety functions or essential characteristics needed to ensure the safety of the

facility and protection of the public and environment during operations and during and following

off-normal conditions; and (2) worker safety functions that ensure the health and safety of the

workers.

The public safety function for fusion is the confinement of radioactive and hazardous

material under normal and off-normal conditions. Potential public safety concerns related to

confinement include (1) ensuring afterheat removal, (2) providing rapid plasma shutdown,

(3) controlling of coolant internal energy, (4) controlling of chemical energy sources,

(5) controlling of magnetic energy, and (6) limiting air and water discharges from the facility.

Worker safety functions are related to worker hazards and routine releases. The issues

associated with the worker safety function that should be evaluated are (1) limiting occupational

exposure to radiation, (2) limiting the exposure to electromagnetic fields, and (3) controlling

other industrial hazards and hazardous materials.

It is recommended that the SSCs required to implement the public safety function should

employ the requirements imposed on systems defined as being safety-class SSCs in DOE 1994

(DOE STD-3009-94). The specific definition of a safety-class system is as follows:

Systems, structures, or components including primary environmental moni-

tors and portions of process systems, whose failure could adversely affect the

environment, or safety and health of the public as identified in the safety analysis.

The safety-class SSCs are associated with the public safety function of confinement that

protects the public and the environment from exceeding the radiological evaluation guidelines in

DOE-STD-6002.

It is recommended that the SSCs that address potential safety concerns or are required

to protect the worker safety functions should employ the requirements imposed on systems

defined as being designated as safety-significant SSCs in DOE 1994 (DOE STD-3009-94). The

specific definition of a safety-significant system is as follows:

Structures, systems, and components not designated as safety-class

SSCs but whose preventive or mitigative function is a major contributor to