ML16314A973

Pacific Gas and Electric Company Checking Columns in Auxiliary Building Unit 1 for 7.5M Hosgri Vertical Acceleration

ML16314A973
Person / Time
Site:	Diablo Canyon
Issue date:	11/09/2016
From:	Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML16314A973 (6)

Text

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F. liain Frame Concrete Column Design (Key Columns) (488428, 4/8444)

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3. forces and moments at key sections

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( 5. general comments and preliminary audit findings

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Columns should be checked for. moments, shears and axial forces which result from SRSS 3-component combination, 'and the column capacity should be derived from moment, axial force and shear interaction diagrams for the colum.

Columns:

Re-evaluation of all columns in the Auxiliary Building revealed that they have adequate reserved capacity, in most cases with high safety margins.

The average load in columns is found to be 2700 KIPS in Hosgri analysis versus 2100 KIPS in DDE. Average safety factor is about 2.5 (Hosgri Loadms)

Lateral loads on clumn were calculated from the Shear Wall computer program output, according to the relative stiffnesses. Column behavior was checked by using ultimate strenght interaction curves on a SRSS basis. All Confinement reinforcement in columns confirm to ACI code.

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