Document: NUREG-0800
Document ID: 339b5072-d5b1-47d7-9002-e7b942ab753b
Document Type: srp
Title: II.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070311.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.3.8
CFR Part: 
CFR Title: 

Content:
iking Structural Elements," Holmes and Narver, Inc., Revised November 1973. 8. Regulatory Guide 1.76, "Design Basis Tornado for Nuclear Power Plants." DRAFT Rev. 2 - April 1996 3.5.3-8 TABLE 1 Minimum Acceptable Barrier Thickness Requirements For Local Damage Prediction Against Tornado Generated Missiles Concrete Strength Wall Thickness Roof Thickness Regions MPa (psi) cm (inches) cm (inches) * 20.7 (3000) 59 (23) 46 (18) Region I 27.6 (4000) 51 (20) 41 (16) 34.5 (5000) 46 (18) 36 (14) 20.7 (3000) 41 (16) 33 (13) Region II 27.6 (4000) 36 (14) 28 (11) 34.5 (5000) 33 (13) 26 (10) 20.7 (3000) < 16 (6) < 16 (6) 45 Region III 27.6 (4000) < 16 (6) < 16 (6) 34.5 (5000) < 16 (6) < 16 (6)46 For definition of Regions I, II, and III, refer to Regulatory Guide 1.76 (Ref. 8). * 3.5.3-9 DRAFT Rev. 2 - April 1996 Table 2 Revised Tornado Missile Spectrum Missile Description Dimensions Mass Weight Velocity (meters) (kilograms) (meters per sec.) a Wood Plank 0.092 x 0.289 x 3.66 52 83 6-inch Schedule 40 Pipe 0.168 Diameter x 4.58 130 52 1-inch Steel Rod 0.0254 Diameter x 0.915 4 51 Utility Pole 0.343 Diameter x 10.68 510 55 12-inch Schedule 40 Pipe 0.32 Diameter x 4.58 340 47 Automobile 5 x 2 x 1.3 1810 5947 Velocities are horizontal velocities. For vertical velocities, 70 percent of the horizontal velocities are is a 48 acceptable. For missile velocities in tornado regions other than Region I, see SRP Section 3.5.1.4. DRAFT Rev. 2 - April 1996 3.5.3-10 APPENDIX A STANDARD REVIEW PLAN SECTION 3.5.3 PERMISSIBLE DUCTILITY RATIO FOR OVERALL DAMAGE PREDICTION I. INTRODUCTION In the evaluation of overall response of reinforced concrete and steel structural elements (e.g., missile barriers, columns, slabs, etc. ) subjected to impactive or impulsive loads, such as impacts 49 due to missiles, assumption of nonlinear response (i.e., ductility ratios greater than unity) of the structural elements is generally acceptable, provided that the intended safety functions of the structural elements