Abstract: An arrangement is provided for mitigating pressure loss in a steam tunnel of a boiling water reactor. To reduce pressure loss in the steam tunnel, a diverter element is operatively connected to at least one of a plurality of pipe supports in a first direction opposed to a flow of steam in the steam tunnel so as to divide the steam flow over the at least one of the plurality of pipe supports. Further, a combiner element is operatively connected to at least one of the plurality of pipe supports in a second direction in a same direction as the flow of steam in the steam tunnel so as to combine the divided steam flow over the at least one of the plurality of pipe supports into a continuous steam flow. This division and recombination of steam flow may reduce form losses caused by the at least one of the plurality of pipe supports in the steam tunnel, which may in turn mitigate pressure loss in the steam tunnel of the boiling water reactor.