20.500.12556/DKUM-97666 Zaznavanje odstopanj v delovanju grelnikov jedrske elektrarne na podlagi regresijskih modelov magistrsko delo Detection of deviations in the operation of nuclear power plant heaters based on regression models Magistrsko delo obravnava zaznavanje zgodnjih odstopanj v delovanju regenerativnih grelnikov napajalne vode v sekundarnem krogu Nuklearne elektrarne Krško. Na podlagi razpoložljivih procesnih meritev je razvit empirični regresijski model, ki opisuje pričakovano obnašanje grelnika med normalnim obratovanjem. Odstopanja se identificirajo z rezidualno analizo, s katero se namesto statičnih alarmnih pragov spremlja neskladje med napovedjo modela in meritvijo v danih obratovalnih pogojih. Poseben poudarek je na predobdelavi podatkov, izboru vhodnih spremenljivk in validaciji modela s statističnimi kazalniki. Prag detekcije je določen objektivno z ROC-analizo in Youdenovim kriterijem. Učinkovitost metode je prikazana na dveh scenarijih s simulirano napako, dvigu temperature drenaže in dvigu pretoka drenaže grelnika 6A. This master’s thesis addresses early detection of abnormal behaviour in regenerative feedwater heaters in the secondary cycle of the Krško Nuclear Power Plant. Using available process measurements, a data-driven regression model is developed to describe the heater’s expected behaviour under normal operating conditions. Abnormal conditions are identified through residual analysis, where the difference between the model prediction and the actual measurement is tracked under the same operating conditions. The work focuses on data preprocessing, selecting key input variables, and model validation using standard statistical indicators. Instead of fixed alarm limits, the detection threshold is set objectively using ROC analysis and the Youden criterion. The approach is demonstrated on two synthetic fault scenarios for Heater 6A: an increase in drain temperature and an increase in drain flow. zaznavanje odstopanj grelnik napajalne vode linearni regresijski model rezidualna analiza Nuklearna elektrarna Krško anomaly detection feedwater heater linear regression model residual analysis Krško Nuclear Power Plant true true false [M. Obreza] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-03-31 07:16:42 2026-06-05 14:30:34 2026-06-06 03:06:59 0000-00-00 00:00:00 2026 0 Krško 0 Krško XVII, 74 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.311.25:621.1.016.4(043.2) 280676611 MAG_Obreza_Manja_2026.pdf MAG_Obreza_Manja_2026.pdf 1 6E3055557BFA4DE5FC539D15C29EC4ED 7a54719f0fb9730c38a8478dffa79a524a84414ac9b989294ecec974e560e549 45b0f73d-4721-11f1-8089-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=205703 Fakulteta za energetiko 0 0 0