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approved General Field Service Padlock.  Where locking hardware is not
practicable, 1/2-inch (12.7-mm) chains meeting the requirements of RR-C-271
(Table 2, Type 1, Grade C, Class 1), will be used with an approved General
Field Service Padlock.
While automatic latching (locking) devices are required for
vehicular and personnel gates at nuclear storage facilities, they also should
be considered during any security gate design.
At nuclear weapons storage sites, vehicle entry sally-port(s),
personnel swing gates, and turnstiles, each with their associated gate
latching systems, will be designed in accordance with NAVFAC P-272, Definitive
Drawings drawing number 1404126.  These drawings specify vehicle sally-ports
that consist of an enclosed area with two vehicle gates.  The gates are
electrically controlled so when a vehicle enters, the inner gate is closed
while the outer gate is open.  The outer gate must be closed and latched
before the inner gate can be opened to allow the vehicle to enter the
restricted area.  The design accommodates the reverse procedure for vehicles
exiting the restricted area.  All pedestrian and vehicle gates incorporate an
automatic electrical latching feature when closed.  The remotely controlled
gates are operated from the Entry Control Point (ECP). An emergency override
is provided in the ECP to allow both gates to be opened simultaneously for
emergency vehicles.
Many power operators for sliding gates are designed to "lock-up"
gate motion by means of an internal friction brake system that engages when
the operator is stopped.  This type of locking device is not adequate to
secure the gate when it is not manned by security personnel; therefore, one of
the locking or latching methods discussed above must be provided.
Gate Power-Operators. As noted above, gate power-operators with
automatic latching (locking) systems are required for vehicular gates at
nuclear storage facilities.  With the requirements of access control becoming
more sophisticated and involved, the use of power-operators for gates at other
types of restricted areas is more compelling for active vehicular security
gate operation.  The designer should analyze the facility access control
procedures and anticipated traffic flow through each proposed vehicular gate.
From this analysis, the potential effectiveness of a power-operator in
improving access control operations for gates can be evaluated.  When vertical
lift gates are designed, gate power-operators are mandatory except in rare
circumstances when the gate will seldom be used and manual operation of the
gate is reasonable.
Gate power-operator controls must be located so they cannot be
reached or tampered with from outside the security fence.  Most gates will
require site-peculiar operating accessories, warning devices, or safety
systems in addition to the actual operator.  The designer should coordinate
the design of gate power-operators with the command safety officer.


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