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:
bile, 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 except for the small missile in Spectrum I or missile C above. These missiles, which are used to test barrier openings, should be assumed to have the same velocity in all directions. Missiles A, B, C, and E are to be considered at all elevations and missiles D and F at elevations up to 9.2 m (30 Feetft) above all grade levels within 0.81 km (½ 33 mile) of the facility structures. 34 Applicants who were required at the construction permit stage to design to one of the missile spectra (A or B) of the November 24, 1975 version of this SRP section (or a review modification such as a 61 cm (24" in.) vertical and 53 cm (21" in.) horizontal wall thickness commitment 35 36 in Region I), shall have the option at the OL stage of showing conformance with either their original commitment or Rev. 2 (same as Rev. 1) to this SRP section. Partial compliance with each is not acceptable. SRP Section 3.5.1.4, November 24, 1975 MISSILE SPECTRUM A37 Fraction of total tornado velocity A. Wood plank, 10 cm x 30 cm x 3.7 m (4 in. x 12 in. x 12 ft), weightmass 90.7 kg (200 lb.). 0.8 B. Steel pipe, 8 cm (3 in.) diameter, schedule 40, 3 m (10 ft) long, weightmass 35.4 kg (78 lb) 0.4 C. Steel rod, 2.54 cm (1 in.) diameter x 0.9 m (3 ft) long, weightmass 3.6 kg (8 lb). 0.6 D. Steel pipe, 15 cm (6 in.) diameter, schedule 40, 4.6 m (15 ft) long, weightmass 129.3 kg (285 lb). 0.4 E. Steel pipe, 30 cm (12 in.) diameter, schedule 40, 4.6 m (15 ft) long, weightmass 337 kg (743 lb). 0.4 DRAFT Rev. 3 - April 1996 3.5.1.4-6 F. Utility pole, 34.3 cm (13.5-1/2 in.) diameter, 10.7 m (35 ft) long, weightmass 675.9 kg (1490 lb). 0.4 G. Automobile, frontal area 1.86 m (20 ft **2), 2 2 weightmass 1814 kg (4000 lb). 0.2 SRP Section 3.5.1.4, November 24, 1975 "NO TUMBLING" MISSILE SPECTRUM B38 Horizontal