A turbogenerator rotor lock (1) is described, the turbogenerator rotor lock (1) including a head portion (10) and a locking portion (20, 21), wherein the locking portion (20,21) extends from the head portion (10) to engage with a turbogenerator rotor to prevent its rotation. In this way, a simplified apparatus for locking a turbogenerator rotor in position is provided, allowing the prime mover to continue operation in the event of a turbogenerator system (1000) failure
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