Accession Number : AD0707932

Title :   FIRE ASPECTS OF CIVIL DEFENSE.

Corporate Author : OFFICE OF CIVIL DEFENSE WASHINGTON D C

Report Date : JUL 1968

Pagination or Media Count : 12

Abstract : This report describes the general dimensions of the fire threat resulting from nuclear attack, particularly as a result of ignition of thin materials by the thermal (heat) flash. A review of the best available information on the thermal ignition capabilities of air-burst nuclear weapons with yields from 1 megaton to 100 megatons indicates that thermal ignitions may occur, under average to good visibility conditions, at ranges where the blast overpressure is between 1 and 3 pounds per square inch (p.s.i.), with perhaps 2 p.s.i. as a reasonable estimator of the region within which ignitions may occur. The severity of resulting fires and the likelihood of fire spread depend on the amount and spacing of combustibles within the ignition area. Mass fires are likely only in built-up urban areas rather than in suburban or rural areas. Thus the potential ignition areas cannot be considered as a single fire area 'engulfed in flame' since the controlling factors are the occurrence and size of the combustible areas rather than the ignition range of the weapon. (Author)

Descriptors :   (*NUCLEAR WARFARE, URBAN AREAS), (*CIVIL DEFENSE, FIRE SAFETY), NUCLEAR EXPLOSIONS, IGNITION, COUNTERMEASURES, BLAST, THERMAL RADIATION, AIRBURST

Subject Categories : Safety Engineering
      Civil Defense

Distribution Statement : APPROVED FOR PUBLIC RELEASE