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A brush seal (30) is provided between a first stationary component (32) and a second rotating component (34). A cooling medium is provided through a plurality of jet nozzles (46) for flow along an upstream surface portion of the brush seal bristles (40) and along the surface adjoining the tips of the bristles. The cooling medium cools the brush seal bristles to a temperature below the temperature of the working fluid medium passing through the turbine. The jet nozzles may be arranged in the shroud or in the upstream backing plate of the brush seal to direct the cooling medium toward the juncture of the brush seal and the sealing surface. (FIG.1)