Abstract
The influence of burn-up and design parameters of 17×17 current PWR type fuel rod on pellet-cladding interaction (PCI) under power ramping, was studied with light water loop instrumented in HBWR. The obtained results are as follows: (1) With increase of bum-up, the PCI became large. With reduction of diametral gap and decrease of fill gas pressure, the PCI became large. The usage of chamfered dish pellet with small L/D instead of non-chamfered dish pellet with large L/D, could reduce the PCI. (2) At the averaged burn-up of 18 MWdilcgU, a standard PWR rod was subjected power cyclings (power range 30 to 45 kW/m with period 2025 min.) to 620 times without no failure during the course of cycling. The power overshooting was occurred repeatedly, accompanying with the increase of PCI. Fission gas release rate of the cycled rod was almost equal to that of the reference one. It indicated that the enhancement of FP gas release during cycling was little. It was also revealed that FP gas release rate was roughly dependent on square root of time. (3) At the burn-up of 12 MWd/kgU, one rod failed by PCI. The fuel behavior during failure occurring was pursued on time using in-core. measuring system.
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