Method for operating a gas turbine for power plant fed by a high reactive fuel; the method comprises the steps of: a) providing a gas turbine having an axis and comprising: - a compressor (3, 30) for compressing air, - a feeding of a highly reactive fuel; - a sequential combustor (22, 31, 33) for mixing and combusting the compressed air with the fuel - at least a turbine (5, 7, 21) for expanding the combusted hot gas; wherein the sequential combustor (22, 31, 33) comprises: - a first combustor provided with at least a first burner (12, 24) fed by compressed air and configured for injecting fuel in the compressed air and with at least a first combustion chamber (4, 25); - a second combustor provided with a plurality of second burners (26, 33), fed by hot gas leaving the first combustor and configured for injecting fuel in the hot gas and with at least a second combustion chamber (6, 27); wherein the gas turbine comprises at least a by-pass circuit configured for spilling at least part of the compressed air directed to the first burners (12, 24) and for injecting this spilled air directly inside the sequential combustor downstream the first burners (12, 24); wherein the sequential combustor comprises a plurality of can combustors, each can combustor comprising the first and the second combustor; b) feeding the gas turbine with a high reactive fuel; c) spilling part of the compressed air directed from the compressor to the first burner; d) injecting the spilled air directly inside the combustor by-passing the first burner; wherein the fuel massflow split between the first stage and the second stage is adjusted such that the inlet temperature to the second stage is such that a target flame position of the reheat flame inside the second combustion chamber is ensured. a) providing a gas turbine having an axis and comprising: - a compressor (3, 30) for compressing air, - a feeding of a highly reactive fuel; - a sequential combustor (22, 31, 33) for mixing and combusting the compressed air with the fuel - at least a turbine (5, 7, 21) for expanding the combusted hot gas; wherein the sequential combustor (22, 31, 33) comprises: - a first combustor provided with at least a first burner (12, 24) fed by compressed air and configured for injecting fuel in the compressed air and with at least a first combustion chamber (4, 25); - a second combustor provided with a plurality of second burners (26, 33), fed by hot gas leaving the first combustor and configured for injecting fuel in the hot gas and with at least a second combustion chamber (6, 27); wherein the gas turbine comprises at least a by-pass circuit configured for spilling at least part of the compressed air directed to the first burners (12, 24) and for injecting this spilled air directly inside the sequential combustor downstream the first burners (12, 24); wherein the sequential combustor comprises a plurality of can combustors, each can combustor comprising the first and the second combustor; - a compressor (3, 30) for compressing air, - a feeding of a highly reactive fuel; - a sequential combustor (22, 31, 33) for mixing and combusting the compressed air with the fuel - at least a turbine (5, 7, 21) for expanding the combusted hot gas; - a first combustor provided with at least a first burner (12, 24) fed by compressed air and configured for injecting fuel in the compressed air and with at least a first combustion chamber (4, 25); - a second combustor provided with a plurality of second burners (26, 33), fed by hot gas leaving the first combustor and configured for injecting fuel in the hot gas and with at least a second combustion chamber (6, 27); the gas turbine comprises at least a by-pass circuit configured for spilling at least part of the compressed air directed to the first burners (12, 24) and for injecting this spilled air directly inside the sequential combustor downstream the first burners (12, 24); wherein the sequential combustor comprises a plurality of can combustors, each can combustor comprising the first and the second combustor; b) feeding the gas turbine with a high reactive fuel; c) spilling part of the compressed air directed from the compressor to the first burner; d) injecting the spilled air directly inside the combustor by-passing the first burner;