A steam turbine system comprising: a high pressure turbine operatively coupled to an intermediate pressure turbine and a low pressure turbine; a steam seal header for maintaining a constant self-sustaining sealing pressure to the LP turbine using a first steam flow in a seal steam line from a seal packing of the HP turbine; a leak off line coupling a leak packing of the HP turbine to the IP turbine; characterised in that the system further comprises: a valve positioned in a connector line connecting the leak off line and the seal steam line; and a controller configured for controlling operation of the valve to divert a portion of a second steam flow from the leak off line to the first steam flow, during non-full load operations, to supply an increased first steam flow to the steam seal header to maintain the sealing flow requirement for seal packings on LP turbine without requiring additional steam from other sources, eliminating the need to pull steam from other sources and to assist in maintaining a desired self-sealing load point, wherein the controller is configured for controlling operation of the valve to maintain a desired self-sealing load point of approximately 90% or greater during all load conditions of the turbine system, indicating that greater than approximately 90% of the total amount of first and second steam flow (112, 122) delivered to the steam seal header is used during all load conditions of the turbine system to maintain the sealing flow requirement for the seal packings on the LP turbine. a high pressure turbine operatively coupled to an intermediate pressure turbine and a low pressure turbine; a steam seal header for maintaining a constant self-sustaining sealing pressure to the LP turbine using a first steam flow in a seal steam line from a seal packing of the HP turbine; a leak off line coupling a leak packing of the HP turbine to the IP turbine; characterised in that the system further comprises: a valve positioned in a connector line connecting the leak off line and the seal steam line; and a controller configured for controlling operation of the valve to divert a portion of a second steam flow from the leak off line to the first steam flow, during non-full load operations, to supply an increased first steam flow to the steam seal header to maintain the sealing flow requirement for seal packings on LP turbine without requiring additional steam from other sources, eliminating the need to pull steam from other sources and to assist in maintaining a desired self-sealing load point, wherein the controller is configured for controlling operation of the valve to maintain a desired self-sealing load point of approximately 90% or greater during all load conditions of the turbine system, indicating that greater than approximately 90% of the total amount of first and second steam flow (112, 122) delivered to the steam seal header is used during all load conditions of the turbine system to maintain the sealing flow requirement for the seal packings on the LP turbine. a valve positioned in a connector line connecting the leak off line and the seal steam line; and a controller configured for controlling operation of the valve to divert a portion of a second steam flow from the leak off line to the first steam flow, during non-full load operations, to supply an increased first steam flow to the steam seal header to maintain the sealing flow requirement for seal packings on LP turbine without requiring additional steam from other sources, eliminating the need to pull steam from other sources and to assist in maintaining a desired self-sealing load point, wherein the controller is configured for controlling operation of the valve to maintain a desired self-sealing load point of approximately 90% or greater during all load conditions of the turbine system, indicating that greater than approximately 90% of the total amount of first and second steam flow (112, 122) delivered to the steam seal header is used during all load conditions of the turbine system to maintain the sealing flow requirement for the seal packings on the LP turbine.