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Derivation of Facility Modes
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Design Features - doe-std-3009-94_cn3_3-30-060094


DOE-STD -3009-94
5.5.X.1
Safety Limits, Limiting Control Settings, and Limiting
Conditions for Operation
This section provides the basis and identifies information sufficient to derive
SLs, LCSs, and LCOs to support the facility TSR documentation required by
10 CFR 830.205. SLs, if used, are reserved for a small set of extremely
significant features that prevent potentially major offsite impact. LCSs are
developed for any SL that is protected by an automatic device with setpoints.
LCSs/LCOs act to keep normal operating conditions below the SLs and are
developed for each SL identified, thereby providing a margin of safety. Most
LCOs are assigned without an accompanying SL.
Generally SLs are applicable only for protection of passive barriers as close to
the accident source as possible whose failure, due to the occurrence of a
specific event, will result in exceeding the Evaluation Guideline. Mitigation of
releases is generally not amenable to useful definition of SLs. For example, a
ventilation system directing airflow through HEPA filters to keep offsite
radio logical dose below the Evaluation Guideline during an accident is
mitigative and is more appropriately covered by a LCO. Temporary loss of its
function during normal operations does not initiate a significant hazardous
material release. An LCO on the sys tem would identify the specific responses
necessary to compensate for the loss of safety function. Control of the
ventilation system via a SL would be academic for preventing accidents that
the ventilation system only mitigates. In contrast, consider a t ank that acts as a
barrier preventing an uncontrolled release of hazardous material that could
exceed the Evaluation Guideline without ventilation mitigation. If that tank
could experience a hydrogen explosion and rupture, then the tank hydrogen
concentration may warrant coverage by a SL.
5.5.X.2
Surveillance Requirements
This section provides the basis and identifies information necessary to derive
Surveillance Requirements that address testing, calibration, or inspection
requirements to maintain operatio n of the facility within SLs, LCSs, and
LCOs.
5.5.X.3
Administrative Controls
This section provides the basis and identifies information necessary to derive
TSR administrative controls. This section is the only applicable section for
those features listed in Section 5.3, "TSR Coverage," that are provided with
only TSR administrative controls. The rationale for assigning TSR
administrative controls need to be clearly and briefly stated.
A special type of TSR administrative control is that covering a safety
management program. The administrative controls section of the TSR
document will contain commitments to establish, maintain, and implement
these programs at the facility and, as appropriate, facility staffing requirements.
Specific administrative contro ls, when designated, provide specific actions
Page 68


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