Access to the site not granted due to weather conditions

We are engaged in a NEC3 Option A contract.

Access to the Site has been delayed, due to rain and flooding.

Does the Contractor have valid reason/grounds to raise a Compensation Event under clause 60.1(2) or other, as the Contractor has already completed the fabrication works, in the workshop (which is listed as a Working Area in the Contract Data) and is now incurring costs due to the delay, as the personnel specifically employed and trained for the project, are now standing?

Assuming you have an Accepted Programme which shows the relevant dates, yes.

The compensation event is for access not being available. The reason why it wasn’t available is not relevant, but it is your common law duty to mitgate any losses that arise.