Document: NUREG-0800
Document ID: fce5c014-cdea-4bf2-83f9-535d051f0f3b
Document Type: srp
Title: MISSILES GENERATED BY NATURAL PHENOMENA
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070375.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.4
CFR Part: 
CFR Title: 

Content:
s postulated missiles that include at least three objects: a massive high kinetic energy missile which deforms on impact, a rigid missile to test penetration resistance, and a small rigid missile of a size sufficient to just pass through any openings in protective barriers. Until more definitive guidelines are established, these missiles may be assumed to be an 1800 Kg (4000 lb) automobile, a 26 125 Kg (280 lb) 20 cm (8" in.) armor piercing artillery shell, and a 2.54 cm (1" in.) 27 28 solid steel sphere, all impacting at 35% of the maximum horizontal windspeed of the design basis tornado. The first two missiles are assumed to impact at normal incidence, the last two impinge upon barrier openings in the most damaging directions. These 29 missiles are identified as Spectrum I. Alternately, the missiles selected by the National Bureau of Standards as representative of construction site debris in report NBSIR 76-1050 (Reference 5) may be used. These 30 are identified as Spectrum II missiles. Tornado regions are defined in WASH-1300. SPECTRUM II Velocity (m/sec) (ft/sec) 31 32 MISSILE Mass(Kg) Dimensions(m) Region I Region II Region III A. Wood Plank, mass 52 kg (115 lb), .092 m x .289 m x 3.66 m (3.62 in. x 11.38 in. x 12.0 ft) 83 (272) 70 (230) 58 (190) 3.5.1.4-5 DRAFT Rev. 3 - April 1996 B. 15 cm (6" in.) Sch 40 pipe, mass 130 kg (287 lb), .168 m Dia. x 4.58 m (6.62 in. Dia. x 15.0 ft) 52 (171) 42 (138) 10 (33) C. 2.54 cm (1" in.) Steel rod, mass 4 kg (9 lb), .0254 m Dia. x .915 m (1 in. Dia. x 3.0 ft) 51 (167) 40 (131) 8 (26) D. Utility pole, mass 510 kg (1124 lb), .343 m Dia. x 10.6 m (13.5 in. Dia. x 35.0 ft) 55 (180) 48 (157) 26 (85) E. 30 cm (12" in.) Sch 40 pipe, mass 340 kg (750 lb), .32 m Dia. x 4.58 m (12.6 in. Dia. x 15.0 ft) 47 (154) 28 (92) 7 (23) F. Automobile, mass 1810 kg (4000 lb), 5 m x 2 m x 1.3 m (16.4 ft x 6.6 ft x 4.3 ft) 59 (193) 52 (171) 41 (134) Vertical velocities of 70% of the postulated horizontal velocities are acceptable in both spectra