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Special Section Papers

Integrated Blast Resistance Model of Nuclear Power Plant Auxiliary Facilities

[+] Author and Article Information
Irad Brandys

Engineering Development Unit,
NRCN, P.O. Box 9001,
Beer-Sheva 8419001, Israel;
Faculty of Engineering Sciences,
Ben-Gurion University of the Negev,
P.O. Box 653,
Beer-Sheva 8410501, Israel
e-mail: iradbr@gmail.com

David Ornai

Structural Engineering Department,
Ben-Gurion University of the Negev,
P.O. Box 653,
Beer-Sheva 8410501, Israel;
Protective Technologies R&D Center,
Ben-Gurion University of the Negev,
P.O. Box 653,
Beer-Sheva 8410501, Israel
e-mail: ornaid@bgu.ac.il

Yigal Ronen

Nuclear Engineering Unit,
Ben-Gurion University of the Negev,
P.O. Box 653,
Beer-Sheva 8410501, Israel
e-mail: yronen@bgu.ac.il

1Corresponding author.

Manuscript received August 28, 2016; final manuscript received December 18, 2016; published online May 25, 2017. Assoc. Editor: Ilan Yaar.

ASME J of Nuclear Rad Sci 3(3), 030903 (May 25, 2017) (8 pages) Paper No: NERS-16-1094; doi: 10.1115/1.4035692 History: Received August 28, 2016; Revised December 18, 2016

Standards, guidelines, manuals, and researches refer mainly to the required protection of a nuclear power plant (NPP) containment structure (where the reactor's vessel is located) against different internal and external extreme events. However, there is no consideration regarding the man-made extreme event of external explosion resulting from air bomb or cruise missile. A novel integrated blast resistance model (IBRM) of NPP's reinforced concrete (RC) auxiliary facilities due to an external above ground explosion based on two components is suggested. The first is structural dynamic response analysis to the positive phase of an external explosion based on the single degree-of-freedom (SDOF) method combined with spalling and breaching empirical correlations. The second is in-structure shock analysis, resulting from direct-induced ground shock and air-induced ground shock. As a case study, the resistance of Westinghouse commercial NPP AP1000 control room, including a representative equipment, to an external above ground blast loading of Scud B-100 missile at various standoff distances ranging from 250 m (far range) till contact, was analyzed. The structure's damage level is based on its front wall supports' angle of rotation and the ductility ratio (dynamic versus elastic midspan displacement ratio). Due to the lack of specific structural damage demands and equipment's dynamic capacities, common protective structures standards and manuals are used while requiring that no spalling or breaching shall occur in the control room while it remains in the elastic regime. The engineering systems and equipments' spectral motions should be less than their capacity. The integrated blast resistance model (IBRM) of the structure and its equipment may be used in wider researches concerning other NPP's auxiliary facilities and systems based upon their specifications.

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Figures

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Fig. 1

A schematic view of the shock wave propagation due to surface explosion

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Fig. 2

Shock wave parameters

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Fig. 3

Peak incident and reflected pressures comparison

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Fig. 4

Reinforced concrete structures' damage versus standoff distance

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Fig. 5

Conversion of a RC structural element to an equivalent SDOF system

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Fig. 6

Element's angle of rotation at its supports in the plastic mode

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Fig. 7

Dynamic shape modes of a one way fixed–fixed reinforced concrete plate under uniform pressure: (a) elastic, (b) elasto-plastic, and (c) plastic

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Fig. 8

Damage assessment of monitor and control equipment due to in-structure shock

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Fig. 9

IBRM of a control room subjected to Scud B-100 explosion

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