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Extra resources for Accid. Anal. - Nuclear Powerplants with PWRs

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The process is slow and the operator usually has sufficient time for corrective measures. It is usually classified as an AOO. Inhomogeneous or local dilution takes place if a slug of non-borated water or low boron concentration water is formed in the primary loop. There is a potential for rapid core power increase if the slug can be transported without sufficient mixing to the reactor core by pump startup or by re-establishing natural circulation. The slug could be formed by non-borated water injection of CVCS into stagnant loops or through leakages from other systems.

The process is slow and the operator usually has enough time to take corrective measures. Homogeneous dilution is usually classified as an AOO. 19 Inhomogeneous or local boron dilution takes place if a slug of nonborated water or water with low boron concentration is formed in the primary loop. There is a potential for rapid core power increase if the slug is transported without sufficient mixing to the reactor core, due to pump startup or for example to re-establishment of natural circulation.

Therefore, careful consideration needs to be given to the aspects above and corresponding sensitivity studies have to be carried out. In the analysis, attention is to be paid to scenarios leading to flow stagnation, which causes a higher cooldown rate and formation of cold plumes in the downcomer. Reliable prediction of the flow stagnation is very complicated but essential for a PTS analysis. Various phenomena influence the onset of flow stagnation, such as coolant discharge, ECCS injection, SG heat transfer and coolant mixing in the downcomer.

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