Potential System Safety Functions

DOE-HDBK-6004-99

Potential System Safety Functions

Normal Operations

Safety-significant remote handling systems and components should not cause a Safety System to fail

under normal plant operating conditions. Potential safety functions during normal operation include:

1. Erect portable radiation shielding panels

2. Place or relocate experimental devices in high radiation fields

3. Test or inspect SSCs as necessary to assure performance of safety functions

Maintenance

Remote handling systems and components should not cause a collision with safety systems or

components while performing normal or abnormal plant maintenance. System design and operational

controls should limit operator radiation exposure. Potential safety functions during maintenance

include:

1. Erect portable radiation shielding panels

2. Replace equipment or components in high radiation fields or transport equipment or components

to a hot-cell.

3. Decontaminate SSCs in preparation for maintenance

Design Basis Accidents

Remote handling equipment classified as safety-class should be designed to function both during and

after a design basis event. Safety-significant remote handling systems and components should not

drop their loads, collide with structures or releasing gas or aerosols under basis accident conditions.

Safety-significant remote handling systems and components should also not cause safety systems or

components to fail under design basis accident conditions. Potential safety functions during design

basis accidents include:

1. Install/place diagnostic instruments

2. Install consequence mitigation devices in high radiation fields or otherwise unsafe conditions.

Beyond Design Basis Accidents

There are no system safety functions required for beyond design basis accidents. Beyond design basis

accidents include internal and external initiators whose frequency is lower than the design basis

frequency specified in the safety analysis.