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Extra info for Commissioning of Research Reactors [NS-G-4.1] (IAEA Pub 1268)

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These data will form a basis for the future assessment of degradation or trends in performance. 31. Stage C may be divided into two substages as follows: (a) (b) C1: Power ascension tests; C2: Power tests. 32. The following prerequisites should be met before commencing stage C: (a) (b) (c) Stage B commissioning tests should be completed, and their results should be evaluated and approved. Regulatory reviews should be carried out and approvals should be obtained as required. Full reactor systems, including the complete heat removal system, should be functionally proved and ready for full power operation.

Reducing the amount of reactivity in each movement and waiting longer for the neutron count rate to stabilize); — If necessary, making subcritical measurements at regular intervals during the movement of reactivity control mechanisms. (g) Reactor critical — Withdrawal of the neutron source, if possible, and readjustment of the position of the reactivity control mechanisms; — Raising of the power sufficiently to bring the neutron count rate into a responsive range on the instrumentation for subsequent measurements; — Performance of possible measurements of reactivity coefficients, and measurements of reactivity worth of reactivity control mechanisms (safety, compensating or regulating devices); — Scramming the reactor and estimation of the reactivity worth of all the reactivity control devices, if possible.

33. Power ascension should be performed in steps, as specified in procedures. At each step a series of tests should be carried out to confirm the design intent and the safety of continuing the power ascension. Data and results obtained in 30 the tests should be reviewed and any differences between the predicted and observed values should be reconciled before continuation to the next power level (see Ref. 46). 34. During substage C2 the following tests should be carried out: (a) (b) (c) Verification that the radiation dose rates in the facility are as expected and verification of the adequacy of the shielding; Verification that gaseous, liquid and particulate effluents are at anticipated and acceptable levels; Verification that reactor parameters and characteristics such as reactivity coefficients and the effects of xenon and other poisons are as anticipated and acceptable.

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