This stage commence on the date following the signed acceptance of stage 1a and must not  exceed  three (3) consecutive months . The Contracting Authority will inform the contractor on  the schedule for Equipment delivery. The schedule of Equipment installation, commissioning and  operator training (training of few hours, distinct from the training defined as option) , shall  mutually be agreed among the parties. It ends on the date satisfactory Equipment performance is  established as attested by the signed form contained in Annex IV-Certificate of conformity of the  contract and operator training has been given. The payment of this stage is conditioned by the  SAT approved by JRC  STAGE 1B: EQUIPMENT DELIVERY, INSTALLATION, COMMISSIONIONG AND SITE ACCEPTANCE TEST  (SAT). OPERATOR TRAINING.  These stages commence after stage 1b on the explicit release of the Contracting Authority. They  initially last  twelve (12) consecutive months and unless otherwise notified by the Contracting  Authority, it is deemed to be renewed for the same duration and scope following expiry of the  previous twelve (12) months period up to a maximum of  three (3) renewals . Any twelve (12)  months period must not end unless an onsite visit to perform preventive maintenance and  calibration of the Equipment has been completed.  STAGE 2A: PREVENTIVE MAINTENANCE, CALIBRATION & STAGE 2B: CORRECTIVE MAINTENANCE.  REPORTING  11  TS-JRC/PTT/2021/OP/CNP/0763  At the end of each intervention, both for the preventive and corrective maintenance, a technical report  will be produced, signed by the contractor and countersigned by the JRC responsible. This technical report will indicate the contract number, the work performed, the working time and  include a detailed list of the defects found and the parts replaced, the list of the documentation  updated or modified. The technical reports and the documentation (completeness and correctness) shall be subject to JRC  responsible approval and shall condition payment as per of the contract. Corrective maintenance services and options related to training will be done through specific  orders which may contain refined specifications. The contractor shall provide the offer within five  working days from the request. The offer for corrective maintenance shall indicate the proposed  number of working days for the manpower and the list of the spare parts, where applicable, to be  replaced and the deadline for completion of the intervention. The rates for the manpower shall be  those stated in annex II of the contract. Request for an offer does impose no obligation on the  Commission to purchase. Only the signature of the specific order form is binding on the Commission.  The payment for options related to training is conditioned by the JRC approval of the execution  training programme. The payment for Stage 2b: Corrective Maintenance is conditioned by the JRC approval of the  corrective maintenance intervention.  The contractor has to provide to the contracting authority in maximum 2 weeks from the start of  the stage, the foreseen plan for preventive maintenance and for calibration in the respective period  of 12 months. The payment for Stage 2a: Preventive Maintenance, Calibration is conditioned by  the JRC approval of all foreseen interventions for preventive maintenance and for calibration.