Approval Basis for Technical Safety Requirements

DOE-STD-1104-96

3.0 APPROVAL BASIS FOR TECHNICAL SAFETY REQUIREMENTS

3.1

Management and Coordination

DOE reviews of TSRs are generally conducted in coordination with DSA reviews, and by

many of the same team members. This provides an economy of effort, because team

members, by virtue of their familiarity with the DSA, have an understanding of the

commitments made in the DSA that need to be reflected in the TSR. The discussions in

Section 1 of this Standard relative to management and coordination of DSA reviews are

equally applicable to the TSR review process. The management plan should address

both DSA and TSR reviews. Because the TSRs must implement commitments made in

the DSA, approvals and implementation of both the DSA and TSRs must be coordinated.

3.2

Approval Bases

The appr oval bases for the TSR document are the TSR provisions. These TSR

provisions may be design features, safety limits, operating limits (limiting control settings

and limiting conditions of operation), surveillance requirements, or administrative controls

(primarily commitments to implement safety management programs according to the

facility-specific characteristics described in the DSA). The approval bases for a TSR

document include a disciplined analysis and tracing of commitments to hazard controls

through appropriate provisions that implement these controls in a TSR document. In

some cases the specific treatment of safety controls in the TSR is committed to in the

DSA; in other cases, it is a judgment call as to the appropriate TSR treatment.

Determinin g the adequacy of the TSR provisions generally entails being able to conclude

that

Hazard controls that are discussed in the DSA are faithfully translated

into TSR provisions.

The TSR provisions are appropriate and consistent with the DSA.

The sources of information in a DSA regarding these provisions are the hazards analysis,

including description of hazard controls; the description of safety structures, systems, and

components (SSCs), the classification of these SSCs as Safety Class, Safety Significant ,

or other important defense-in -depth SSCS, the description of the functional requirements

for the safety SSCs, and the derivation of TSRs section; and the descriptions of the

safety management programs.

3.2.1

Hazards Analysis

A hazards analysis will include a disciplined analysis of all hazards within the scope of

the DSA, including a listing of applicable preventative and mitigative hazard controls.

These controls may include safety SSCs, design features, and provisions of various

safety management programs. These controls should be regarded as DSA

commitments. They should be traced through DSA documentation to specific TSR

provisions.

3.2.2

Safety SSC

Safety SSCs must be described in sufficient detail in a DSA so that their functional

requirements are defined and the bases for TSR requirements are derived. These safety

SSCs will be either active or passive. If passive, they should also be considered for

designation as "Design Features" in the TSR. These are features of facility design that

may not be changed without DOE review and approval. A crosscheck between DSA -

identified important design features and the Design Features section of the TSR should