If the performance manager is to challenge the O&M contractor’s Availability calculation, they will need to evidence their claim with half-hourly data and an operational diary.
Os yw'r rheolwr perfformiad am herio cyfrifiad Argaeledd y contractwr O&M, bydd angen iddo ddangos tystiolaeth o'i hawliad gyda data bob hanner awr a dyddiadur gweithredol.