Method of determining a leakage in a heat transfer fluid channel of a heat transferring reactor system, and a heat transferring reactor

A method of determining a leakage in a heat transfer fluid channel of a heat transferring reactor system, the method comprising the steps of:

• measuring the heat transfer fluid flow rate (qMS,M) prevailing in the heat transfer heat transfer fluid channel of the reactor system during operation;
• modelling heat transfer heat transfer fluid flow rate (qMS,C) in the heat transfer heat transfer fluid channel during operation by utilizing process data in a numerical model of the heat transferring reactor system giving the heat transfer fluid (qMS,C) flow rate of the heat transferring reactor system under substantially leak-free conditions;
• comparing the measured heat transfer fluid flow rate in the heat transfer fluid channel and modelled heat transfer fluid flow rate with each other to obtain an error measure (DMS) for heat transfer fluid flow rate that is included in an error measure set;
• monitoring the error measure set and a number of occurrences in the error measure set during operation;
• and
• determining the presence of a heat transfer fluid channel leakage in case the error measures (DMS) exceed a pre-defined threshold, or a number of occurrences in the error measure set exceed a predetermined threshold during a predetermined time period.