Impact of N-isotope composition control of ferritic steel on classification of radioactive materials from fusion reactor

T. Hayashi; R. Kasada; K. Tobita; S. Nishio; T. Sawai; H. Tanigawa; S. Jitsukawa

doi:10.1016/j.fusengdes.2007.01.007

Impact of N-isotope composition control of ferritic steel on classification of radioactive materials from fusion reactor

T. Hayashi, R. Kasada, K. Tobita, S. Nishio, T. Sawai, H. Tanigawa, S. Jitsukawa

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

The possibility of reducing the concentration of ¹⁴C produced in irradiation of reduced activation ferritic steels (RAFS) intended as structural materials in first wall and blanket of fusion power plants was investigated. During RAFS irradiation ¹⁴C is mainly produced from the more abundant of the two isotopes of nitrogen present in the steel, namely ¹⁴N. The method proposed consists in increasing the enrichment of the other isotope (¹⁵N). One-dimension transport calculations show that for a typical DEMO blanket configuration an ¹⁵N enrichment from the natural value (0.37%) to 95% was sufficient to keep the end of life ¹⁴C concentration in the RAFS below the limit (3.7 × 10⁷ Bq/kg) fixed by the Japanese Nuclear Safety Commission for qualifying it as a low level material (LLM) which can be disposed by shallow land burial.

Original language	English
Pages (from-to)	2850-2855
Number of pages	6
Journal	Fusion Engineering and Design
Volume	82
Issue number	15-24
DOIs	https://doi.org/10.1016/j.fusengdes.2007.01.007
Publication status	Published - 2007 Oct
Externally published	Yes

Keywords

Carbon-14
Enrichment
Fusion reactor
Nitrogen-15
Radioactive material
Reduced-activation ferritic steel

ASJC Scopus subject areas

Civil and Structural Engineering
Nuclear Energy and Engineering
Materials Science(all)
Mechanical Engineering

Access to Document

10.1016/j.fusengdes.2007.01.007

Cite this

@article{b9081d757eea46dca7fda4df9da9362c,

title = "Impact of N-isotope composition control of ferritic steel on classification of radioactive materials from fusion reactor",

abstract = "The possibility of reducing the concentration of 14C produced in irradiation of reduced activation ferritic steels (RAFS) intended as structural materials in first wall and blanket of fusion power plants was investigated. During RAFS irradiation 14C is mainly produced from the more abundant of the two isotopes of nitrogen present in the steel, namely 14N. The method proposed consists in increasing the enrichment of the other isotope (15N). One-dimension transport calculations show that for a typical DEMO blanket configuration an 15N enrichment from the natural value (0.37%) to 95% was sufficient to keep the end of life 14C concentration in the RAFS below the limit (3.7 × 107 Bq/kg) fixed by the Japanese Nuclear Safety Commission for qualifying it as a low level material (LLM) which can be disposed by shallow land burial.",

keywords = "Carbon-14, Enrichment, Fusion reactor, Nitrogen-15, Radioactive material, Reduced-activation ferritic steel",

author = "T. Hayashi and R. Kasada and K. Tobita and S. Nishio and T. Sawai and H. Tanigawa and S. Jitsukawa",

year = "2007",

month = oct,

doi = "10.1016/j.fusengdes.2007.01.007",

language = "English",

volume = "82",

pages = "2850--2855",

journal = "Fusion Engineering and Design",

issn = "0920-3796",

publisher = "Elsevier BV",

number = "15-24",

}

TY - JOUR

T1 - Impact of N-isotope composition control of ferritic steel on classification of radioactive materials from fusion reactor

AU - Hayashi, T.

AU - Kasada, R.

AU - Tobita, K.

AU - Nishio, S.

AU - Sawai, T.

AU - Tanigawa, H.

AU - Jitsukawa, S.

PY - 2007/10

Y1 - 2007/10

N2 - The possibility of reducing the concentration of 14C produced in irradiation of reduced activation ferritic steels (RAFS) intended as structural materials in first wall and blanket of fusion power plants was investigated. During RAFS irradiation 14C is mainly produced from the more abundant of the two isotopes of nitrogen present in the steel, namely 14N. The method proposed consists in increasing the enrichment of the other isotope (15N). One-dimension transport calculations show that for a typical DEMO blanket configuration an 15N enrichment from the natural value (0.37%) to 95% was sufficient to keep the end of life 14C concentration in the RAFS below the limit (3.7 × 107 Bq/kg) fixed by the Japanese Nuclear Safety Commission for qualifying it as a low level material (LLM) which can be disposed by shallow land burial.

AB - The possibility of reducing the concentration of 14C produced in irradiation of reduced activation ferritic steels (RAFS) intended as structural materials in first wall and blanket of fusion power plants was investigated. During RAFS irradiation 14C is mainly produced from the more abundant of the two isotopes of nitrogen present in the steel, namely 14N. The method proposed consists in increasing the enrichment of the other isotope (15N). One-dimension transport calculations show that for a typical DEMO blanket configuration an 15N enrichment from the natural value (0.37%) to 95% was sufficient to keep the end of life 14C concentration in the RAFS below the limit (3.7 × 107 Bq/kg) fixed by the Japanese Nuclear Safety Commission for qualifying it as a low level material (LLM) which can be disposed by shallow land burial.

KW - Carbon-14

KW - Enrichment

KW - Fusion reactor

KW - Nitrogen-15

KW - Radioactive material

KW - Reduced-activation ferritic steel

UR - http://www.scopus.com/inward/record.url?scp=34948884039&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34948884039&partnerID=8YFLogxK

U2 - 10.1016/j.fusengdes.2007.01.007

DO - 10.1016/j.fusengdes.2007.01.007

M3 - Article

AN - SCOPUS:34948884039

SN - 0920-3796

VL - 82

SP - 2850

EP - 2855

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

IS - 15-24

ER -

Impact of N-isotope composition control of ferritic steel on classification of radioactive materials from fusion reactor

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this