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5.2.1 SC-1/2 SSCS
This section summarizes the safety functions, boundaries, support systems, functional
requirements, and TSR implementation linkage for those SSCs specifically credited in the
accident analysis as providing necessary safety functions to protect the MOI and CW from
radiolorrical harm. These SSCs are designated SC-1/2 SSCs as shown in Table 5-1. The
following systems were identified as SC-1/2 SSCs.
Fire Suppression, Detection, and Alarm System (automatic sprinkler system, flow
afams.@ire Department response, smoke detectorsiFire Department response. and fire
extinguishers).
Building structure (interior fire barrier (wall and fire doors separating office area
from Room 134): exterior walls arid concrete roofs; Room 153 floor) (passive design
features).
Heating. Ventilating. aid Air Conditioning System (filtered exhaust ventilation
provided bv the Building991 roof olenutxi and bv the Building 985 plenum (if
intended to be used)).
Table 5-2 provides a matrix of the Building 991 Complex SC-112 SSCs. Column 1 of
the table identifies the SSC identified as a SC-1/2 SSC and the specific attributes of that SSC
that make it a SC-1/2 SSC. The “Safety Function” column of the table provides the reason for
designating the SSC as a SC-1/2 SSC. This column specifically identifies the safety function
credited in the safen.7 analysis. Non-safety functions are not provided in this column. If the
accident analysis requires that the SSC be relied on to operate after a natural phenomena hazard
(NPH) event, that h don will be idenuied in this column. The “Boundaries” column of the
table identifies the specific portions of the SSC that are being relied upon in the accident
analysis. This column attempts to be specific in the portions of the SC-1/2 SSC that must be 1
maintained at the level specified in the TSRs to meet the identified safety function. The
“Support Systems” column identifies those SSCs, whose failure, would result in the SC-1/2 SSC
not being able to perform its identified safety function. The “Functional Requirements” column
defines the operability requirements for the identified SC-1/2 SSC. These requirements are
necessary for the SC-1/2 SSC to meet its safety function. These functional requirements
specifically address the pertinent response parameters related to an accident for which the safety
function is being relied upon. Specific acceptance criteria for the SSC to meet the functional
requirements, along with surveillance requirements and frequencies, is presented in Appendix A,
Building 991 Complex Technical Safety Requirements. The “TSR” column provides the linkage
from this section to the implementing control specified in Appendix A, Building 991 Complex
Technical Safety Requirements.
Revision 1
Swtcmher 1993
5 -9 Building 991 Complex FSAR