ML091940084

Luminant RAI 22 and 23 SBLOCA, Vortex, Air Ingestion, Void Fraction and Flashing Issues

ML091940084
Person / Time
Site:	Comanche Peak
Issue date:	07/09/2009
From:	Luminant Power
To:	Office of Nuclear Reactor Regulation
References
Download: ML091940084 (3)

Text

NRC - Luminant Power Public Meeting Comanche Peak Nuclear Power Plant SBLOCA (RAI 22 and 23)

July 9th 2009 SBLOCA Switchover

Core tube - 3% to 10 % design Vortex Suppression

- PCI Sure-Flow Strainer design utilizes a combination of recognized 'defense in depth'

.multiple vortex suppression devices -

perforated plate, parallel disk plates, disk grill wires, core tube slots, module external bracing, and the resultant tortuous strainer internal flow path - all providing more than the single grating vortex suppressor recommended in RG 1.82 Revision 3.

Table 1 - CPNPP SBLOCA Comparison for CSHL CPNPP SBLOCA CSHL, ft of water Comparison Scenarios 120 212 250 120 212 250 SBLOCA (400 0.0138 0.0114 0.0109 0.7657 0.7657 0.7657 gpm) > > >

0.0138 0.0114 0.0109 SBLOCA (1200 0.0933 0.0847 0.0826 0.7657 0.7657 0.7657 gpm) > > >

0.0933 0.0847 0.0826 Table 2 - CPNPP SBLOCA Scenario Head Loss Comparison for TSHL CPNPP SBLOCA TSHL, ft of water Comparison Scenarios 120 212 250 120 212 250 SBLOCA 0.4858 0.2514 0.2049 0.7657 0.7657 0.7657 (400 gpm) 0.4858 0.2514 0.2049 SBLOCA 0.5653 0.3247 0.2766 0.7657 0.7657 0.7657 (1200 gpm) 0.5653 0.3247 0.2766