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Power coefficient anomaly in JOYO

Abstract

Operation of the JOYO experimental fast reactor with the MK-I core has been divided into two phases: (1) 50 MWt power ascension and operation; and (2) 75 MWt power ascension and operation. The 50 MWt power-up tests were conducted in August 1978. In these tests, the measured reactivity loss due to power increases from 15 MWt to 50 MWt was 0.28% ..delta.. K/K, and agreed well with the predicted value of 0.27% ..delta.. K/K. The 75 MWt power ascension tests were conducted in July-August 1979. In the process of the first power increase above 50 MWt to 65 MWt conducted on July 11, 1979, an anomalously large negative power coefficient was observed. The value was about twice the power coefficient values measured in the tests below 50 MW. In order to reproduce the anomaly, the reactor power was decreased and again increased up to the maximum power of 65 MWt. However, the large negative power coefficient was not observed at this time. In the succeeding power increase from 65 MWt to 75 MWt, a similar anomalous power coefficient was again observed. This anomaly disappeared in the subsequent power ascensions to 75 MWt, and the magnitude of the power coefficient gradually  More>>
Authors:
Publication Date:
Dec 15, 1980
Product Type:
Technical Report
Report Number:
JAPFNR-565
Reference Number:
ERA-06-015682; EDB-81-045438
Resource Relation:
Other Information: Work performed under United States - Japanese Fast Reactor Exchange Program; translated in English from the original Japanese document PNC-N--941-81-102
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; JOYO REACTOR; POWER COEFFICIENT; REACTOR KINETICS; REACTOR OPERATION; VARIATIONS; BREEDER REACTORS; EPITHERMAL REACTORS; EXPERIMENTAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; KINETICS; LIQUID METAL COOLED REACTORS; OPERATION; POWER REACTORS; REACTIVITY COEFFICIENTS; REACTORS; RESEARCH AND TEST REACTORS; 220600* - Nuclear Reactor Technology- Research, Test & Experimental Reactors
OSTI ID:
6613622
Research Organizations:
Power Reactor and Nuclear Fuel Development Corp., Oarai (Japan)
Country of Origin:
United States
Language:
English
Availability:
NTIS, PC A03/MF A01.
Submitting Site:
TIC
Size:
Pages: 47
Announcement Date:
Apr 01, 1981

Citation Formats

Yamamoto, H. Power coefficient anomaly in JOYO. United States: N. p., 1980. Web.
Yamamoto, H. Power coefficient anomaly in JOYO. United States.
Yamamoto, H. 1980. "Power coefficient anomaly in JOYO." United States.
@misc{etde_6613622,
title = {Power coefficient anomaly in JOYO}
author = {Yamamoto, H}
abstractNote = {Operation of the JOYO experimental fast reactor with the MK-I core has been divided into two phases: (1) 50 MWt power ascension and operation; and (2) 75 MWt power ascension and operation. The 50 MWt power-up tests were conducted in August 1978. In these tests, the measured reactivity loss due to power increases from 15 MWt to 50 MWt was 0.28% ..delta.. K/K, and agreed well with the predicted value of 0.27% ..delta.. K/K. The 75 MWt power ascension tests were conducted in July-August 1979. In the process of the first power increase above 50 MWt to 65 MWt conducted on July 11, 1979, an anomalously large negative power coefficient was observed. The value was about twice the power coefficient values measured in the tests below 50 MW. In order to reproduce the anomaly, the reactor power was decreased and again increased up to the maximum power of 65 MWt. However, the large negative power coefficient was not observed at this time. In the succeeding power increase from 65 MWt to 75 MWt, a similar anomalous power coefficient was again observed. This anomaly disappeared in the subsequent power ascensions to 75 MWt, and the magnitude of the power coefficient gradually decreased with power cycles above the 50 MWt level.}
place = {United States}
year = {1980}
month = {Dec}
}