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Large LOCA-earthquake combination probability assessment - Load combination program. Project 1 summary report

Abstract

This report summarizes work performed for the U.S. Nuclear Regulatory Commission (NRC) by the Load Combination Program at the Lawrence Livermore National Laboratory to establish a technical basis for the NRC to use in reassessing its requirement that earthquake and large loss-of-coolant accident (LOCA) loads be combined in the design of nuclear power plants. A systematic probabilistic approach is used to treat the random nature of earthquake and transient loading to estimate the probability of large LOCAs that are directly and indirectly induced by earthquakes. A large LOCA is defined in this report as a double-ended guillotine break of the primary reactor coolant loop piping (the hot leg, cold leg, and crossover) of a pressurized water reactor (PWR). Unit 1 of the Zion Nuclear Power Plant, a four-loop PWR-1, is used for this study. To estimate the probability of a large LOCA directly induced by earthquakes, only fatigue crack growth resulting from the combined effects of thermal, pressure, seismic, and other cyclic loads is considered. Fatigue crack growth is simulated with a deterministic fracture mechanics model that incorporates stochastic inputs of initial crack size distribution, material properties, stress histories, and leak detection probability. Results of the simulation indicate that the  More>>
Publication Date:
Jan 01, 1980
Product Type:
Technical Report
Report Number:
NUREG/CR-1889; UCID-18694; INIS-XA-N-055
Resource Relation:
Other Information: 49 refs, 7 figs, 1 tab; PBD: Jan 1980
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CRACK PROPAGATION; DETERMINISTIC ESTIMATION; EARTHQUAKES; FATIGUE; FRACTURE MECHANICS; LEAKS; LOSS OF COOLANT; PRIMARY COOLANT CIRCUITS; PWR TYPE REACTORS; SEISMIC EFFECTS
Sponsoring Organizations:
U.S. Nuclear Regulatory Commission, Division of Nuclear Regulatory Research, Office of Nuclear Regulatory Research, Washington, DC (United States)
OSTI ID:
20479136
Research Organizations:
Lawrence Livermore Laboratory, Livermore, CA (United States)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: Contract A0133; TRN: XA04N0354053346
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
54 pages
Announcement Date:
Jul 20, 2004

Citation Formats

Lu, S, Streit, R D, and Chou, C K. Large LOCA-earthquake combination probability assessment - Load combination program. Project 1 summary report. IAEA: N. p., 1980. Web.
Lu, S, Streit, R D, & Chou, C K. Large LOCA-earthquake combination probability assessment - Load combination program. Project 1 summary report. IAEA.
Lu, S, Streit, R D, and Chou, C K. 1980. "Large LOCA-earthquake combination probability assessment - Load combination program. Project 1 summary report." IAEA.
@misc{etde_20479136,
title = {Large LOCA-earthquake combination probability assessment - Load combination program. Project 1 summary report}
author = {Lu, S, Streit, R D, and Chou, C K}
abstractNote = {This report summarizes work performed for the U.S. Nuclear Regulatory Commission (NRC) by the Load Combination Program at the Lawrence Livermore National Laboratory to establish a technical basis for the NRC to use in reassessing its requirement that earthquake and large loss-of-coolant accident (LOCA) loads be combined in the design of nuclear power plants. A systematic probabilistic approach is used to treat the random nature of earthquake and transient loading to estimate the probability of large LOCAs that are directly and indirectly induced by earthquakes. A large LOCA is defined in this report as a double-ended guillotine break of the primary reactor coolant loop piping (the hot leg, cold leg, and crossover) of a pressurized water reactor (PWR). Unit 1 of the Zion Nuclear Power Plant, a four-loop PWR-1, is used for this study. To estimate the probability of a large LOCA directly induced by earthquakes, only fatigue crack growth resulting from the combined effects of thermal, pressure, seismic, and other cyclic loads is considered. Fatigue crack growth is simulated with a deterministic fracture mechanics model that incorporates stochastic inputs of initial crack size distribution, material properties, stress histories, and leak detection probability. Results of the simulation indicate that the probability of a double-ended guillotine break, either with or without an earthquake, is very small (on the order of 10{sup -12}). The probability of a leak was found to be several orders of magnitude greater than that of a complete pipe rupture. A limited investigation involving engineering judgment of a double-ended guillotine break indirectly induced by an earthquake is also reported. (author)}
place = {IAEA}
year = {1980}
month = {Jan}
}