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The foundamental studies on the corrosion detection in the primary coolant system of a nuclear reactor

Research Project

Project/Area Number 03453168
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Nuclear engineering
Research InstitutionKINKI UNIVERSITY

Principal Investigator

SHIBATA Toshikazu  Kinki University Atomic Energy Professor Research Institute, 原子力研究所, 教授 (90027392)

Co-Investigator(Kenkyū-buntansha) KONDO Yoshihide  Kinki University Atomic Energy Lecturer Research Institute, 原子力研究所, 講師 (70088467)
KOGA Taeko  Kinki University Atomic Energy Associate Research Institute Professor, 原子力研究所, 助教授 (20088420)
NAKAMURA Katsuichi  Kinki University Atomic Energy Associate Research Institute Professor, 原子力研究所, 助教授 (80088385)
MORISHIMA Hiroshige  Kinki University Atomic Energy Professor Research Institute, 原子力研究所, 教授 (80088418)
森嶋 彌重  近畿大学, 原子力研究所, 教授 (88008418)
玉井 忠治  京都大学, 原子炉実験所, 助教授 (10027427)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1993: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1992: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1991: ¥3,200,000 (Direct Cost: ¥3,200,000)
Keywordsprimary coolant / stainless steel plate / high frequency inductively coupled plasma system / elution / activation analysis / corrosion product / bending stress / 応力腐食割れ / ICPS
Research Abstract

There are many useful informations in the primary coolant of a nuclear reactor for making a safety diagnosis of the reactor pressure boundaries. For various eluting conditions we investigated eluted components using high frequency inductively coupled pllasma system (Shimazu ICPS-1000III) and activation analysis. The results are :
1. Fe, Ni, Mo, Cr, Si, etc. as corrosion products were eluted using nitric acid, the most powerful eluting agent. Especially Fe and Ni in the eluate increased with time, which are the landmarkes of corrosion appreciation. Since corrosion products after nitric acid treatment on steel plate treat at 1000^0C was extremely large, it was made uniform structure by heat treatment. This process generally shows high corrosion resistance, however, it produced deposition due to heat treatment, which caused high boundary corrosion. 304L,310S and 321 which include relatively much Cr, showed high acid resistance. Their eluates, Fe and Cr, increased linearly for 100 hours, and thereafter they decreased. Initially they made high corrosion, however, the corrosion gradually stopped with time.
2. Corrosion of test piece SUS-316L added with ten kinds of bending stresses was such that eluate quantities of Fe and Cr increased linearly with time until 100hrs and were more than those without bending stress at 100hrs of elution. Other than Fe and Cr were not detected.
3. Using activation analysis ^<56>Mn was detected most sharply, under heat treatment at 400^0C only ^<56>Mn and ^<60m>Co were detected. As raising temperature ^<52>V and ^<101>Tc were detected. Generally ^<56>Mn and ^<52>V have a good detection sensitivity and the eluates increased with time, which are convenient to see the level of corrosion. ^<59>Fe, ^<51>Cr and ^<60>Co were noted as the nuclides detected after long time activation.

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report

URL: 

Published: 1991-04-01   Modified: 2016-04-21  

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