Hey Suman,
A small piece of policy that i found on net:
Policy It is the Company’s policy to appoint retired employee if so required by the business. Exceptions shall be made on a case-by-case basis if all the following criteria are applicable:
1. The Branch/Division has an existing budgeted vacant position or has received authorization to establish a new budgeted position.
2. The work/project to be assigned to the retired annuitant is of a short duration (less than six months).
3. The work cannot be completed by existing staff or requires specialized knowledge, skills, or abilities.
4. There are compelling reasons for requesting the use of the budgeted position.
Authority A retired employee shall only be appointed to a position if the position has been established by the Management and the retired annuitant is to perform the approved duties of the position. In other words, placement can be made to a position but the budgeted position cannot be filled while the retired annuitant is performing the duties of such established position.
Retired employees are appointed to perform specific work based upon their knowledge acquired while employed with the Department. These appointments may be either during an emergency to prevent stoppage of business or because the retired employee has skills needed in performing work of limited duration
Appointment restriction Appointments shall not exceed 240 days in any fiscal year (Apr to Mar) without reinstatement or loss or interruption of benefits.
Hope this is of some use to you :)