ASTM and TMSR irradiation program

1. ASTM and TMSR irradiation program Derek Tsang SINAP 20.09.2013

2. Introduction • SINAP has a irradiation program to get i-data for material used in molten salt reactors. • Metal and graphite • ASTM standards will be used in all the material properties measurement. • Irradiation temperature is 650℃ • Max dose for metal is 2.5×1019 n/cm2（E > 0.1MeV） • Max dose for graphite is 5×1020 n/cm2（E > 0.1MeV）

3. Metal irradiation program • Total samples = 136 • Samples for irradiation = 46

5. Lab Introduction-1 Mechanical Properties Platform Heat Treatment Lab Creep and Rupture Lab Tension and Impact Lab Metallographic Preparation Lab Hardness Tester and Microscope Fatigue Lab

6. Other Analytical Instrument Lab Introduction-2 Thermal Properties Lab Microscope and Photometer Welding Lab 6 石墨样品制备实验室 Corrosion Lab TEM

7. Graphite irradiation program • Total samples = 312 • Samples for irradiation = 94 + 94

8. Tensile strength • Tensile strength sample size in ASTM is too big for our irradiation program • D3967 is for rock tensile strength • Underestimate graphite tensile strength • More experiment and analytical/numerical studies. • New ASTM standard for graphite tensile strength?

9. DYM or SYM • Gas cooled reactor: gas has no mechanical effect on graphite. • May not be true for molten salt reactor. • 3 ways to do graphite irradiation experiment for molten salt reactors • Not consider molten salt at all • Graphite samples in a container with molten salt and irradiate together. • Force molten salt into graphite samples before irradiation experiment.

10. Standard requires no liquid inside the samples! • After irradiation experiment to measure DYM at what temperature? • High DYM at room temperature • Virgin DYM at high temperature Virgin graphite with molten salt Virgin graphite without molten salt

11. Some thoughts • ASTM Standards mainly for nuclear graphite in gas cooled reactor. • Nuclear graphite in molten salt reactor may need NEW ASTM standards???

12. Thank you!