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Assessment of irradiation effects on beryllium reflector and heavy water tank of JRR-3M

Abstract

The JRR-3M, a swimming pool type research reactor with beryllium and heavy water reflectors, has been operated since 1990. Since the beryllium reflectors are close to fuel and receive high fast neutron fluence in a relatively short time, they may be subject to change their dimensions by swelling due mostly to entrapped helium gaseous. This may bend the reflectors to the outside and narrow gaps between the reflectors and the fuel elements. The gaps have been measured with an ultrasonic thickness gage in an annual inspection. The results in 1996 show that the maximum of expansion in the diametral directions was 0.6 mm against 1.6 mm of a managed value for replacement of the reflector. A heavy water tank of the JRR-3M is made of aluminum alloy A5052. Surveillance tests of the alloy have been conducted to evaluate irradiation effects of the heavy water tank. Five sets of specimens of the alloy have been irradiated in the beryllium reflectors where fast neutron flux is higher than that in the heavy water tank. In 1994, one set of specimens had been unloaded and carried out the post-irradiation tests. The results show that the heavy water tank preserved satisfactory mechanical properties. (author)
Authors:
Murayama, Yoji; Kakehuda, Kazuhiro [1] 
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Oct 01, 1998
Product Type:
Conference
Report Number:
JAERI-Conf-98-015; CONF-9711223-
Reference Number:
SCA: 220600; PA: JPN-99:002133; EDB-99:035233; SN: 99002060112
Resource Relation:
Conference: 1997 workshop on the utilization of research reactors, Bandung (Indonesia), 6-13 Nov 1997; Other Information: PBD: Oct 1998; Related Information: Is Part Of Proceedings of the 1997 workshop on the utilization of research reactors; PB: 495 p.
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; JRR-3M REACTOR; REACTOR MAINTENANCE; BERYLLIUM; NEUTRON REFLECTORS; INSPECTION; TANKS; HEAVY WATER; IRRADIATION; TENSILE PROPERTIES
OSTI ID:
327217
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE99723943; TRN: JP9902133
Availability:
OSTI as DE99723943
Submitting Site:
JPN
Size:
pp. 362-367
Announcement Date:

Citation Formats

Murayama, Yoji, and Kakehuda, Kazuhiro. Assessment of irradiation effects on beryllium reflector and heavy water tank of JRR-3M. Japan: N. p., 1998. Web.
Murayama, Yoji, & Kakehuda, Kazuhiro. Assessment of irradiation effects on beryllium reflector and heavy water tank of JRR-3M. Japan.
Murayama, Yoji, and Kakehuda, Kazuhiro. 1998. "Assessment of irradiation effects on beryllium reflector and heavy water tank of JRR-3M." Japan.
@misc{etde_327217,
title = {Assessment of irradiation effects on beryllium reflector and heavy water tank of JRR-3M}
author = {Murayama, Yoji, and Kakehuda, Kazuhiro}
abstractNote = {The JRR-3M, a swimming pool type research reactor with beryllium and heavy water reflectors, has been operated since 1990. Since the beryllium reflectors are close to fuel and receive high fast neutron fluence in a relatively short time, they may be subject to change their dimensions by swelling due mostly to entrapped helium gaseous. This may bend the reflectors to the outside and narrow gaps between the reflectors and the fuel elements. The gaps have been measured with an ultrasonic thickness gage in an annual inspection. The results in 1996 show that the maximum of expansion in the diametral directions was 0.6 mm against 1.6 mm of a managed value for replacement of the reflector. A heavy water tank of the JRR-3M is made of aluminum alloy A5052. Surveillance tests of the alloy have been conducted to evaluate irradiation effects of the heavy water tank. Five sets of specimens of the alloy have been irradiated in the beryllium reflectors where fast neutron flux is higher than that in the heavy water tank. In 1994, one set of specimens had been unloaded and carried out the post-irradiation tests. The results show that the heavy water tank preserved satisfactory mechanical properties. (author)}
place = {Japan}
year = {1998}
month = {Oct}
}