Safety Valve Popping Test

[bitjantuek]

I have problem about "safety valve popping test" at Power Plant because vendor they try to achieved around 13 times for 1 safety testing. and i see in code and cannot found items that show about limit for "time of popping test". Pls advice

 

[bitjantuek]

Problem about one safety valve was repeated the test 13th times to gets in the acceptable range. For my opinion, test result should not be accepted if the test has been repeated more that 4 times due to valve spring properties has been changed and AI recommend likes my opinion also. But I can not found test limits in code/ASME. Please advice.
Many Thanks