Scholarlink

<p>In sodium-cooled fast reactors (SFRs), the clad tubes experience bi-axial creep due to high temperature and fission gas pressure. This work presents the out-of-pile bi-axial creep tests carried out on pressurized capsules of D9I (SFR-clad material) manufactured by laser welding. D9I tube, having an outer diameter of 6.6&#xa0;mm and thickness of 0.45&#xa0;mm, was welded with an SS316LN end cap autogenously using a 10 KW pulse laser. Laser welding was selected to reduce heat input and distortions. The manufacturing and testing of the pressurized test capsule were carried out by numerical estimation of the creep strains in an SS316L capsule at 700&#xa0;°C as per the methodology given in RCC-MR. The location of the maximum strain obtained by numerical estimation is in agreement with the same observed experimentally. For creep testing at 750&#xa0;°C, eight D9I capsules were manufactured with argon fill pressure of 5&#xa0;MPa (at room temperature). The specimens were taken out at regular intervals from 200&#xa0;h to 1700&#xa0;h, and the creep deformation of the clad tubes was measured. It was observed that the creep strain at the laser weld location is minimal compared to the tube (way from the end cap). For rupture testing at 930&#xa0;°C, another D9I specimen was made with a fill pressure of 6.6&#xa0;MPa. It was observed that the rupture-tested capsules in the tube and the laser weld joint were found to be integral. Estimation of creep strain of the specimen using FE analysis was carried out and the variation between the analytical and experimental values is within 4.7%. The results of the work qualify the laser weld between the clad and its end plug with respect to the bi-axial creep loading.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Qualification of Laser Welded Pressurized D9I Test Capsules Under Bi-Axial Creep Loading for FBR Clad Tubes

  • 期刊论文

  • 发表日期：

    2026年2月25日

查看全文
  • R. Ravikumar,
  • S. C. S. P. K. Krovvidi,
  • C. R. Das,
  • P. K. Chaurasia,
  • S. J. Winston

摘要

In sodium-cooled fast reactors (SFRs), the clad tubes experience bi-axial creep due to high temperature and fission gas pressure. This work presents the out-of-pile bi-axial creep tests carried out on pressurized capsules of D9I (SFR-clad material) manufactured by laser welding. D9I tube, having an outer diameter of 6.6 mm and thickness of 0.45 mm, was welded with an SS316LN end cap autogenously using a 10 KW pulse laser. Laser welding was selected to reduce heat input and distortions. The manufacturing and testing of the pressurized test capsule were carried out by numerical estimation of the creep strains in an SS316L capsule at 700 °C as per the methodology given in RCC-MR. The location of the maximum strain obtained by numerical estimation is in agreement with the same observed experimentally. For creep testing at 750 °C, eight D9I capsules were manufactured with argon fill pressure of 5 MPa (at room temperature). The specimens were taken out at regular intervals from 200 h to 1700 h, and the creep deformation of the clad tubes was measured. It was observed that the creep strain at the laser weld location is minimal compared to the tube (way from the end cap). For rupture testing at 930 °C, another D9I specimen was made with a fill pressure of 6.6 MPa. It was observed that the rupture-tested capsules in the tube and the laser weld joint were found to be integral. Estimation of creep strain of the specimen using FE analysis was carried out and the variation between the analytical and experimental values is within 4.7%. The results of the work qualify the laser weld between the clad and its end plug with respect to the bi-axial creep loading.