scope:

FOREWORD

The Committee on Cranes for Nuclear Power Plants was first established in 1976. In 1980, the scope of the Committee was revised, and its name was changed to the Committee on Cranes for Nuclear Facilities. In 1983, the Nuclear Underhung and Monorail (NUM) Subcommittee was established to develop a standard to cover the design, fabrication, installation, and testing of underhung and monorail equipment used in nuclear facilities. The NUM-1 Standard is the result of the Subcommittee's work.

The first edition of ASME NUM-1 was approved by the American National Standards Institute (ANSI) on October 28, 1996. The second edition of ASME NUM-1 was approved by ANSI on May 3, 2000. The third edition of ASME NUM-1 was approved by ANSI on August 17, 2004.

This Standard, or portions thereof, can be applied to cranes, monorails, and hoists at facilities other than nuclear where enhanced equipment safety may be required, and can be provided by means of either single failure-proof features, enhanced safety features, or a seismic design.

This Standard is split into four major sections: NUM-G, General Specifications (applicable to all equipment); NUM-I, Type I equipment (i.e., equipment that is used to handle critical loads and is required to withstand a seismic event); NUM-II, Type II equipment (i.e., equipment that is not used to handle critical loads and is required to withstand a seismic event); and NUM-III, Type III equipment (i.e., equipment that is not used to handle critical loads and is not required to withstand a seismic event).

Suggestions for the improvement of this Standard arewelcome. They should be addressed to the Secretary, ASME Committee on Cranes for Nuclear Facilities, The American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990.

The 2009 edition of ASME NUM-1 was approved by ANSI on December 22, 2009.