Emergency Planning for facilities is not straightforward.
The "bog standard" linear, risk-based approach is a good start but context often brings complexities which require nuance. Layer over that the social and political dimensions (internal and external) and you start to explore the mire. Difficult questions arise - from the commitment of organisations to adequately resource an effort which brings no visible $ return through to stressful times where 'in extremis' you are caught between the devil and the deep blue sea of recommending the promulgated view of run, hide, call (hopefully buying time for responders to come) - or do you allow scope for the emerging trend of 'fighting back'?
No easy answers. However, there are three straightforward questions which will kickstart your conversations.