MSP432P401R: MSP432P401R

ok , then how can i debug the issue. i mean what can be the reasons for not getting VCORE voltage ? is it due to connection problem of any pins? can you suggest any debugging method to solve this issue. or is there any way to give external 1.2V supply to the controller without using the internal regulator. i am using this controller for around 10 boards and for the other boards the controller works properly , so the issue is not about the design of circuit.

If you only see this on 1 of 10 boards (if I understand you correctly) this sounds like an assembly (soldering)  issue.

What you can try to do is to measure the impedance to ground on at least all power pins on a working board and the non-functional board and see if you have a poor connection.  

Just to confirm: You have opened the container with MSP432P401R just before assembly or have the samples been exposed to air for a period of time before assemble?

i opened the controller just before the assembly and up-to that time the controller have kept in a sealed ESD cover with silica gel.