Intimation to excise deptt. for shutdown of plant.

Our Unit is under CENTRAL EXCISE, I  wish to know do wee need to intimate to the Central Excise for the followings :-

1- Shutdown of plant for Preentive Maintenance

2- Declaration of Non-Production Days (NPD) for a wweek to month due to less demand of product or due to huge stock of finished goods.

If yes then , under which rule , section .if there is any Trade Notice or  Board circuar is publised , pl. provide.

We seek your kind advice.