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On-line surveillance instrumentation for full scale thermal shock trials under real pressurized water conditions -German HDR-program-

: Brinette, R.; Deuster, G.; Dobmann, G.

Nuclear Engineering and Design 102 (1987), S.245-255
ISSN: 0029-5493
MPA-Seminar <12, 1986, Stuttgart>
Fraunhofer IZFP ()
condition monitoring; crack propagation; electrical potential drop; on-line surveillance; pressurized water condition; thermal shock cracking

Within the framework of the HDR reactor safety research program, thermal shock tests on a saturated steam outlet nozzle edge have been conducted under simulated realistic operation conditions (T=300 degree C, p=11 MPa) for the past three years. On the one hand, the tests are to improve our understanding of crack formation and crack growth under thermal shock conditions and, on the other hand, to evaluate and improve the suitability of non-destructive test methods for the on-line surveillance, the detection and quantitative description of natural cracks and crack fields. For on-line monitoring of thermal shock tests conducted on the A2 nozzle, thermocouples and strain gauges (both on the inside and the outside), clip gauges (CMOD measurement), stationary US-probes, the potential drop technique (potential measurement on the inside), and acoustic emission tests have been used. In the final two test phases (approx. 800 load cycles) by a new six-channel R u.D acoustic emission analysis syst em (signal parameter processor) developed and built at IzfP has been applied.