Analysis of pressure- and temperature- induced steam generator tube rupture during PWR severe accident initiated from station blackout

Hidaka, Akihide; Maruyama, Yu; Nakamura, Hideo

Proceedings of 6th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operations and Safety (NUTHOS-6) (CD-ROM), 15 Pages, 2004/00

Severe accident studies showed that Direct Containment Heating issue was resolved for PWRs because a creep rupture at pressurizer surge line would occur prior to the melt-through of Reactor Pressure Vessel during station blackout (TMLB'). However, it was recently concerned that, if the secondary system is depressurized during TMLB', the creep rupture at SG U-tubes would occur earlier than the surge line. This pressure- and temperature-induced SG U-tube rupture (PTI-SGTR) is not preferable because of the increase in offsite consequences. The SCDAP/RELAP5 analyses by USNRC showed that the surge line would fail earlier than the U-tubes. However, the analyses used a coarse nodilization for steam mixing at the SG inlet plenum that could affect the temperature of U-tubes. To investigate the effect of steam mixing, an analysis was performed with MELCOR1.8.4. The analysis showed that the surge line would fail earliest during TMLB' while the U-tubes could fail earliest during TMLB' with secondary system depressurization. Further investigation is needed for occurrence conditions of PTI-SGTR.

Investigation of a neutron measuring system with a position-sensitive-fission-counter

Yamagishi, Hideshi; Ikeda, Yujiro; Ito, Hiroshi; Kakuta, Tsunemi; Nakakawa, Masayuki; Iwamura, Takamichi; Tabata, Hiroaki*; Urakami, Masao*

JAERI-Tech 2000-037, p.12 - 0, 2000/03

JAERI-Tech-2000-037.pdf:1.12MB

no abstracts in English

Fusion-neutron diagnostic on the microwave tokamak experiment

Ogawa, Toshihide; ; Hoshino, Katsumichi; Odajima, Kazuo; Maeda, Hikosuke

JAERI-M 94-021, 45 Pages, 1994/02

JAERI-M-94-021.pdf:1.33MB

no abstracts in English

Development of High-Temperature Fission Counter-Chambers

JAERI-M 85-193, 160 Pages, 1985/11

JAERI-M-85-193.pdf:5.06MB

no abstracts in English

Neutron Yield Monitors for the Fusion Neutronics Source(FNS); For 80Beam Line

; ; ; ;

JAERI-M 83-219, 28 Pages, 1983/12

JAERI-M-83-219.pdf:1.03MB

no abstracts in English