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:
ly applied to one-half of the submerged boundary. This load is to be applied statically together with normal hydrostatic pressure to the submerged portion of the containment. ---- II.A.3 (1b) C. Steam Condensation and Chugging Loads 1. Downcomer Lateral Loads a) Single-Vent Loads (24 in.) Dynamic load to end of vent. Half sine wave with a duration of 3 to 6 ms and corresponding maximum amplitudes of 65 to 10 klbf. Note 4 2.3.3.2 (1c) b) Multiple- Vent Loads (24 in.) Prescribed variation of load per vent vs. number of vents. Determined from single vent dynamic load specification and multivent reduction factor. ---- 2.3.3.3 (1c) Table B-1 Mark II LOCA-related hydrodynamic loads Summary table Load or phenomenon Load specification Load specification clarifying footnotes NRC Evaluation (Foot-note) 6.2.1.1.C-22 Revision 7 - March 2007 c) Single/Mul- tiple Vent Loads (28 in.) Multiply basic 24" vent loads by factor f=1.34 ---- 2.3.2.1 (1c) 2. Submerged Boundary Loads a) High/Medium Steam Flux Condensation Oscillation Load Bounding CO pressure histories observed in 4TCO tests. Inphase application. ---- 2.2.1.3 (1c) b) Low Steam Flux Chugging Load Conservative set of 10 sources derived from 4TCO tests. 7 sources are obtained by averaging each individual key chug and its largest adjacent chugs, the other 3 chugs obtained from 4TCO are used without averaging. Alternate load using 7 sources derived from the 4TCO key chugs without averaging. Sources are applied to plants using the IWEGS/MARS acoustic model assuming source desynchronization of 50 ms. ---- 2.2.2.3 (1c) -Symmetric Load All vents utilize source of equal strength for each of the sources. Table B-1 Mark II LOCA-related hydrodynamic loads Summary table Load or phenomenon Load specification Load specification clarifying footnotes 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