Cable Heat Release, Ignition, and Spread in Tray Installations During Fire (CHRISTIFIRE), Phase 2: Vertical Shafts and Corridors (NUREG/CR-7010, Volume 2)

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Publication Information

Manuscript Completed: January 2013
Date Published: December 2013

Prepared by:
Kevin McGrattan
Scott Bareham

National Institute of Standards and Technology
Building and Fire Research Laboratory
Gaithersburg, MD 20899-8663

David Stroup, NRC Project Manager

NRC Job Code N6983

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington DC 20555-0001

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Abstract

This report documents the second phase of a multi-year program called CHRISTIFIRE (Cable Heat Release, Ignition, and Spread in Tray Installations during Fire). The overall goal of the program is to quantify the burning characteristics of grouped electrical cables. This second phase of the program involved bench-scale and large-scale experiments. Bench-scale experiments were performed using a cone calorimeter in which 10 cm (4 in) by 10 cm (4 in) cable segments were exposed to a relatively high heat flux to determine their burning rate, heat of combustion, and other properties. The large scale experiments consisted of loaded cable trays situated in vertical and horizontal configurations. For the vertical experiments, two cable trays were positioned either in the open air, or in a vertical shaft that was open at the top and bottom. For the horizontal experiments, from one to four loaded cable trays were positioned horizontally with a 30 cm (1 ft) separation from the ceiling and tray to tray. The purpose of both sets of fullscale experiments was to determine the heat release and spread rates of burning cables in a variety of realistic configurations.