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The capability of control elements to manage the reactor operation does not merely relay on their negative reactivity worth, but also the speed required to shutdown the reactor when operation state leads to an accident condition. The response speed of control elements is characterized by delay time which comprises of instrumentation response and dropping time. The adequacy verification on delay time was performed against fast reactivity transient due to inadvertant control rod withdrawal by observing safety parameters at peak power. Three delay times were analized using PARET/ANL code for fast reactivity transients. The calculation results confirmed that the delay time may not exceed 0.5 s. Keywordsdelay time; control element; dropping time; instrumentation response.

Verification on Delay Time Adequacy of RSG GAS (Reaktor Serba Guna - G.A. Siwabessy) Control Elements