A Flight Attendant reported concerns about lack of emergency cockpit access when the keypad entry system to the cockpit was deferred.

Narrative

I printed the flight attendant briefing and noticed a maintenance defect on the keypad entry to cockpit; 'cockpit door keypad is inoperative. Keypad has been deactivated - DOOR CANNOT BE OPENED BY PERSONNEL FROM CABIN SIDE. On board services: A. Flight Attendants must use Interphone to request cockpit access. B. EMERGENCY ACCESS FROM CABIN SIDE IS NOT AVAILABLE. C. cockpit two person rule must be observed.' I informed the purser of my concerns for SAFETY before briefing and he called maintenance. He was informed that there is a code that the pilot can give for alternative access. I briefed with the Captain of any alternative ways for a SAFETY stand point and he stated that there is not any way to access the door under emergency basis at all. I didn't feel comfortable flying on a plane that I wasn't able to access the cockpit for emergency basis on for SAFETY. I called the crew desk immediately to inform them of my SAFETY concerns. I have been charged with a Did Not Fly action and delay of the aircraft for my SAFETY concerns. I hope that my safety issue is addressed for future administrative corrections and hope no one else will have to go through the difficulties that I feel I am being given to defend my integrity of being a SAFETY professional.