PBMR-400 BENCHMARK SOLUTION OF EXERCISE 1 AND 2 USING THE MOOSE BASED APPLICATIONS: MAMMOTH, PRONGHORN Paolo Balestra, Sebastian Schunert, Robert W Carlsen, April J Novak, Mark D DeHart and Richard C Martineau EPJ Web Conf., 247 (2021) 06020 Published online: 22 February 2021 DOI: 10.1051/epjconf/202124706020