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Title: Pressure Effects Analysis of National Ignition Facility Capacitor Module Events

Abstract

Capacitors and power conditioning systems required for the National Ignition Facility (NIF) have experienced several catastrophic failures during prototype demonstration. These events generally resulted in explosion, generating a dramatic fireball and energetic shrapnel, and thus may present a threat to the walls of the capacitor bay that houses the capacitor modules. The purpose of this paper is to evaluate the ability of the capacitor bay walls to withstand the overpressure generated by the aforementioned events. Two calculations are described in this paper. The first one was used to estimate the energy release during a fireball event and the second one was used to estimate the pressure in a capacitor module during a capacitor explosion event. Both results were then used to estimate the subsequent overpressure in the capacitor bay where these events occurred. The analysis showed that the expected capacitor bay overpressure was less than the pressure tolerance of the walls. To understand the risk of the above events in NIF, capacitor module failure probabilities were also calculated. This paper concludes with estimates of the probability of single module failure and multi-module failures based on the number of catastrophic failures in the prototype demonstration facility.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
756890
Report Number(s):
UCRL-JC-135684; 39DP02000
39DP02000; TRN: US0101618
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 8th International Conference on Nuclear Engineering, Baltimore, MD (US), 04/05/2000--04/06/2000; Other Information: PBD: 22 Nov 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPACITORS; EXPLOSIONS; POWER CONDITIONING CIRCUITS; PROBABILISTIC ESTIMATION; US NATIONAL IGNITION FACILITY; WALLS; MECHANICAL PROPERTIES; LIMITING VALUES; RISK ASSESSMENT; BLAST EFFECTS

Citation Formats

Brereton, S, Ma, C, Newton, M, Pastrnak, J, Price, D, and Prokosch, D. Pressure Effects Analysis of National Ignition Facility Capacitor Module Events. United States: N. p., 1999. Web.
Brereton, S, Ma, C, Newton, M, Pastrnak, J, Price, D, & Prokosch, D. Pressure Effects Analysis of National Ignition Facility Capacitor Module Events. United States.
Brereton, S, Ma, C, Newton, M, Pastrnak, J, Price, D, and Prokosch, D. Mon . "Pressure Effects Analysis of National Ignition Facility Capacitor Module Events". United States. doi:. https://www.osti.gov/servlets/purl/756890.
@article{osti_756890,
title = {Pressure Effects Analysis of National Ignition Facility Capacitor Module Events},
author = {Brereton, S and Ma, C and Newton, M and Pastrnak, J and Price, D and Prokosch, D},
abstractNote = {Capacitors and power conditioning systems required for the National Ignition Facility (NIF) have experienced several catastrophic failures during prototype demonstration. These events generally resulted in explosion, generating a dramatic fireball and energetic shrapnel, and thus may present a threat to the walls of the capacitor bay that houses the capacitor modules. The purpose of this paper is to evaluate the ability of the capacitor bay walls to withstand the overpressure generated by the aforementioned events. Two calculations are described in this paper. The first one was used to estimate the energy release during a fireball event and the second one was used to estimate the pressure in a capacitor module during a capacitor explosion event. Both results were then used to estimate the subsequent overpressure in the capacitor bay where these events occurred. The analysis showed that the expected capacitor bay overpressure was less than the pressure tolerance of the walls. To understand the risk of the above events in NIF, capacitor module failure probabilities were also calculated. This paper concludes with estimates of the probability of single module failure and multi-module failures based on the number of catastrophic failures in the prototype demonstration facility.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 22 00:00:00 EST 1999},
month = {Mon Nov 22 00:00:00 EST 1999}
}

Conference:
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