Document: NUREG-0800
Document ID: 919b8fa0-8b11-41bd-9694-2c62120b843b
Document Type: srp
Title: Revision 7 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600403.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
otnotes NRC Evaluation (Foot-note) 6.2.1.1.C-23 Revision 7 - March 2007 -Asymmetric Load Case Source strengths S± = S (1±α) applied to all vents on + and - side of containment. Sources based on the symmetric sources. Asymmetric parameters α based on rms moment method of interpreting experimental 4TCO single-vent and JAERI multivent data. D. Secondary Loads 1. Sonic Wave Load Negligible load ---- III.E.1 (1a) 2. Compressive Wave Load Negligible load ---- III.E.2 (1a) 3. Fallback Load on Submerged Boundary Negligible load ---- III.E.5 (1a) 4. Thrust Loads Momentum balance ---- III.E.6 (1a) 5. Friction Drag Loads on Vents Standard friction drag calculations ---- III.E.7 (1a) 6. Vent Clearing Loads Negligible load ---- III.E.8 (1a) Footnotes For Table B-1 NOTE 1: NRC NUREG sections that describe the NRC specific load evaluation. Specific NUREGs are (a) NUREG-0487 (b) NUREG-0487 Supplement 1 and (c) NUREG-0808. NOTE 2: Impact Drag Loads on Grating Table B-1 Mark II LOCA-related hydrodynamic loads Summary table 6.2.1.1.C-24 Revision 7 - March 2007 The static drag load on grating in the pool-swell zone of the wetwell shall be calculated for grating with open area greater than or equal to 60% by forming the product of the pressure differential as given in Figure 4-40 of NEDO-21061, Revision 2, and the total area of the grating. To account for the dynamic nature of the initial loading, the load shall be increased by a multiplier given by: where: FSE= static equivalent load W = width of grating bars, in. f = natural frequency of lowest mode, Hz D = static drag load NOTE 3: Impact Loads on Small Structures The hydrodynamic loading function that characterizes pool impact on small horizontal structures shall have the versed sine shape. Small structures are defined as pipes, I-beams, and other similar structures having one dimension less than or equal to 20 inches. The acceptance criteria are not applicable to the determination of ovaling stresses in cylindrical pipes. where: