NUREG-1537, Part 2 - NRC

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Acceptance CnItenad
The acceptance criteria for the information on the confinement and HVAC system
ESFs include the following:
* The need for a confinement ESF has been properly identified. To be
considered an ESF, design features must exist to mitigate the consequences
of specific accident scenarios.
* Any ESF in addition to the confinement (e.g., HVAC systems) does not
interfere with normal operations or safe reactor shutdown.
* The ESF design features should ensure that the system is available and
operable when it is required for mitigating accident consequences.
* The minimum design goal of the confinement ESFs should be to reduce
below regulatory limits the potential radiological exposures to the ficility
staff and members of the public for the accidents discussed at the beginning
of this chapter for test and research reactors. Any additional reduction in
potential radiological exposures below the regulatory limits is desirable and
. should be a design goal if it can be reasonably achieved.
* The design of the confinement should not transfer undue radiological risk
to the health and safety of the public in order to reduce potential exposures
to the facility staff.
* The instrumentation and control (I&C) system of the confinement ESF
systems should be as basic and fail safe as possible. They should be
designed to remain functional for the full range of potential operational
conditions, including the environment created by accident scenarios.
* The discussions should identify operational limits, design parameters,
surveillances, and surveillance intervals that will be included in the technical
specifications.
Review Procedures
The applicant should show that the confinement ESFs reduce predicted
radiological exposures and releases from applicable potential accidents to
acceptable levels as discussed at the beginning of this chapter. The reviewer
should examine all accident scenarios analyzed in Chapter 13 of the SAR that
could lead to significant radiological exposures or releases and verify that
consequences can be sufficiently mitigated by the confinement ESF. The reviewer
should confirm that the design and functional bases of confinement ESFs are
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