Loss of off-site power accident analysis of Egyptian test and research reactor number 2

The chosen loss of Off-Site Power (LOSP) accident analysis of Egyptian Test and Research Reactor Number 2 (ETRR-2) covered the failure sequences of the Reactor Shutdown System (RSS), the redundant Emergency Diesel Generator (EDG) and the Uninterruptible Power Supply (UPS). Four generated LOSP accident scenarios are analyzed. Two codes are used in the calculations covered by the present paper. The first is the IAEA Probabilistic Safety Assessment Package (PSAPACK) used for constructing the relevant inductive Event Tree (ET) and quantifying the resulting sequence probabilities. The second code named TR22M21 has been developed by the author to simulate the specific nature of ETRR-2 under this accident. It determines the expected reactor behavior during the steady state and accident conditions. The two codes have been implemented in the four mentioned scenarios. It has been found that the two codes have successfully managed to identify a severe scenario of probability 0.01 that could significantly contribute to the risk of the core damage.