Measurement of coolant flow in fuel elements at the JRR-4 silicide fuel core

Yamamoto, Kazuyoshi; Watanabe, Shukichi; Nagatomi, Hideki; Kaminaga, Masanori; Funayama, Yoshiro

JAERI-Tech 2002-034, 40 Pages, 2002/03

JAERI-Tech-2002-034.pdf:1.97MB

JRR-4, a swimming-pool type research reactor with a thermal power of 3.5MW, attained criticality in July 1998, after replacing its 90% enrichment fuel with a 20% enrichment fuel under the Reduced Enrichment Program. As a part of the program, safety analysis on thermo-hydraulics of the reactor core was conducted on cases including single channel blockage accident. With the conclusion that a certain margin on thermo-hydraulics was necessary, investigation and experiments were carried out with an aim to increase the core flow rate. To increase the core flow, it was carried out to reduce the bypass flow in the core and to increase the primary coolant flow rate from 7m/min to 8m/min. After flow measurements using a mock-up fuel element, flow velocity of the fuel channel was determined as 1.45m/s as opposed to the designed value of 1.44m/s, and the ratio of core flow to total flow was 0.88, exceeding the value 0.86 used for the safety analysis.This report describes the JRR-4 core flow increase plan as well as the results of the channel flow rate measurement

Steady-state thermal hydraulic analysis and flow channel blockage accident analysis of JRR-4 silicide LEU core

Kaminaga, Masanori; Yamamoto, Kazuyoshi; Watanabe, Shukichi

JAERI-Tech 96-039, 72 Pages, 1996/09

JAERI-Tech-96-039.pdf:2.43MB

no abstracts in English

Verification of in-core thermal and hydraulic analysis code FLOWNET/TRUMP for the High Temperature Engineering Test Reactor(HTTR) at JAERI

Maruyama, So; Sudo, Yukio; Saito, Shinzo; Kiso, Yoshihiro*;

Proc. of the 4th Int. Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Vol. 1, p.227 - 232, 1989/12

no abstracts in English

Multi-Rod Burst Test Under a Loss-of-Coolant Accident Condition 〔IV〕; Experimental Result of The No.7808 Bundle

; ; ; ;

JAERI-M 83-083, 68 Pages, 1983/06

JAERI-M-83-083.pdf:4.45MB

no abstracts in English

Multi-Rod Burst Test under A Loss-of-Coolant Accident Condition (II) - Experimental Result of The Bundle No.7806 -

; ; ; ;

JAERI-M 9624, 56 Pages, 1981/08

JAERI-M-9624.pdf:3.66MB

no abstracts in English

Co-Planer Deformation and Thermal Propagation Behavior a Bundle Burst Test

; Koizumi, Yasuo;

JAERI-M 8970, 17 Pages, 1980/07

JAERI-M-8970.pdf:0.84MB

no abstracts in English