Roster pattern for 12-hour shifts

We work in a public hospital and have been approached to introduce a 12-hour shift system.  However, the hours don’t add up on the draft proposal for full-time employees.  What is the roster pattern to be worked?

Clause 5(v)(b) of the Public Health System Nurses’ and Midwives’ (State) Award sets out the choices and approach to specific roster systems to be utilised, dependent on the roster period.  For example, 12 x 12-hour shifts and 1 x 8-hour shift would be worked to average full-time hours over a four-week roster period.  If balanced over a six-week roster period, it will be 9 x 12-hour shifts.