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    This word indicates that adherence to the particular requirement is necessary in order to conform to the specification.

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    A grooved wheel or pulley used with a rope or chain to change direction and point of application of a pulling force.

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    This word indicates that the requirement is a recommendation, the advisability of which depends on the facts in each situation.

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    Fabricated metal housing designed to guard moving machinery and prevent incidental contact with personnel.

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    A crane which travels on a single bridge girder.

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    Safey features included in the crane design to ensure that any credible failure of a single component will not result in loss of control of the load.

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    Those features that are included in the crane design such that any credible failure of a single component will not result in the loss of capability to stop and hold the critical load within facility acceptable excursion limits.

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    Lateral forces on the bridge truck wheels caused by the bridge girders not running perpendicular to the runways. Some normal skewing occurs in all bridges.

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    The horizontal distance center-to-center of runway rails.

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    As defined by the Nuclear Regulatory Commission: "Nuclear reactor fuel that has been used to the extent that it can no longer effectively sustain a chain reaction."

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    As defined by the Nuclear Regulatory Commission "An underwater storage and cooling facility for spent (used) fuel elements that have been removed from a reactor."

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    As defined by the Nuclear Regulatory Commission: "Fuel that has been removed from a nuclear reactor because it can no longer sustain power production for economic or other reasons. "

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    An overhead crane having fixed or telescopic vertical mast suspended from its trolley frame. The mast is fitted with a moveable fork assembly capable of raising an lowering.

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    A method of switching electrical circuits without the use of contacts.

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    A type of control system with infinite speed control between minimum speed and full speed.

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    A type of control system with fixed speed points.

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    A device to limit travel of a trolley or crane bridge. This device normally is attached to a fixed structure and normally does not have energy absorbing ability.

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    The average tensile force per unit of cross sectional area required to rupture the material as determined by test.

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    Maximum lateral deviation from straightness of a structural member, measured at right angles to the Y-Y axis.