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:
cifications referenced in Table B-1, along with the criteria that further clarify these loads specifications, constitute a complete set of acceptable LOCA-related pool dynamic loads. Table B-1 Mark II LOCA-related hydrodynamic loads Summary table 6.2.1.1.C-18 Revision 7 - March 2007 Load or phenomenon Load specification Load specification clarifying footnotes NRC Evaluation (Foot-note) A. Submerged Boundary Loads During Vent Clearing 24 psi overpressure added to local hydrostatic below vent exit (walls and basemat) - linear attenuation to pool surface. ---- II.A.1 (1b) B. Pool-Swell Loads 1. Pool-Swell Analytical Model a) Air- Bubble Pressure Calculated by the pool-swell analytical model (PSAM) used in calculation of submerged boundary loads. ---- III.B.3.a.1 (1a) b) Pool-Swell Evaluation Use PSAM with polytropic exponent of 1.2 to a maximum swell height which is the greater of 1.5 vent submergence or the evaluation corresponding to the ΔP=2.5 psid. ---- II.A.2 (1b) 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-19 Revision 7 - March 2007 c) Pool-Swell Velocity Velocity history vs. pool elevation predicted by the PSAM used to compute impact loading on small structures and drag on gratings between initial pool surface and maximum pool elevation and steady- state drag between vent exit and maximum pool elevation. Analytical velocity variation is used up to maximum velocity. Maximum velocity applies there- after up to maximum pool swell. PSAM predicted velocities multiplied by a factor of 1.1. ----- III.B.3.a.3 (1a) d) Pool-Swell Acceleration Acceleration predicted by the PSAM. Pool acceleration is utilized in the calculation of acceleration loads on submerged components during pool swell. ---- III.B.3.a.4 (1a) e) Wetwell Air Compression Wetwell air compression is calculated by PSAM consistent with maximum pool swell elevation in B.1.b