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Maintenance of this Design Feature is addressed in the TSRs in Section 6, Design Features.
Table 6-1 correlates the Design Features specifically credited in the hazard and accident analysis
to the TSR Design Feature.
6.3 TECHNICAL SAFETY REQUIREMENTS COVERAGE
This section provides assurances that the TSR coverage for the Building 991 Complex is
complete. This section lists the features identified in NSTR-011-98, Safety Analysis for the
Building 991 Complex Final Safety Analysis Report and Chapter 5, Structures, Systems, and
Components, that are needed to provide public safety, significant defense-in-depth, or significant
worker safety. The working definitions used throughout this FSAR in determining the control
feature are as follows:
Public Safety: Those features that have been determined to be essential to assuring public safety
or worker nuclear safety related to immediate fatalities or serious injuries or that maintain the
consequences of facility operations below an established evaluation guideline. These features
are identified as System Category (SC)-1/2 SSCs if the MOI andlor CW could sustain moderote
or high consequences. depending on scenario frequency.
Defense-in-Depth: Those features that provide an additional layer of defense against release of
hazardous materials to the environment. Defense-in-depth features include both facility SSCs
and administrative features. SSCs that are major contributors to defense-in-depth are designated
as sc-3 sscs.
Worker Safety: Those features that provide protection to the IW from the hazards of facility
operation, exclusive of standard industrial hazards. Worker safety features include both facility
SSCs and administrative features. SSCs that are major contributors to worker safety are
designated as SC-3 SSCs.
Table 6-1 lists all of the controls concerning Building 991 SSCs identified during the
hazard evaluation and accident analysis presented in NSTR-011-98. This table describes the
credited control and describes the safety feature being relied upon for that control. The control
feature of the credited control is then defmed. The control feature may be either public safety
(PS), defense-in-depth (DID), or worker safety (WS), as defmed above, or any combination of
these features. The control type is then provided. The control type identifies the system
category of the credited control (i.e., SC-1/2 or SC-3). The TSR control column provides the I
linkage to Appendix A, Building 991 Complex Technical Safety Requirements, to indicate
control coverage in the TSRs. And finally, the accident scenario column provides the linkage to
the accident scenario or accident scenario types where the control is credited.
Revision 1
September 1999
6-3 Building 991 Complex FSAK I
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