A fuel leak has been discovered in the emergency generator at Hemel Hempstead Hospital.
The 'pinprick' leak was discovered in a pipe during a survey but resulted in only 'minor seepage' of diesel into a protective bund, according to West Herts Hospitals NHS Trust.
The generator cuts in if there is a power cut and provides electricity to the hospital.
In a statement the trust said: "The tank was immediately shut off to prevent further leakage and repairs were undertaken.
"The trust was advised that the amount of leaked liquid was well under the level that is required to be reported to the Environmental Agency.
"This issue would have in no way affected the use of the emergency standby generator had it been called into use."
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