...or any part of the work is, for an unreasonable period of time, suspended, delayed, or interrupted by an act of the Contracting Officer in the administration of this contract, or by his fa ilure to act within the time specified in this contract (or if no time is specified, within a reasonable...

...Officer In the administration of the contract, or by his failure to act within the time specified In the contract (or If no time Is specified, within a reasonable time), an adjustment shall be made by the Contracting Officer for any Increase In the cost of performance of the contract (excluding profit)...