United States Nuclear Regulatory Commission - Protecting People and the Environment

Bulletin 75-08: PWR Pressure Instrumentation



BL75008 

BULLETIN 75-08                                     Date: December 11, 1975 

PWR PRESSURE INSTRUMENTATION 

DESCRIPTION OF CIRCUMSTANCES: 

During a recent review of plant heatup and cooldown records at an operating 
nuclear Power plant, it was determined that continuously recorded data was 
not available to verify adherence to the temperature/pressure limitations 
specified in the technical specifications. Such information is necessary for
determining trends and for evaluating pressure transients, as shown during 
the reviews of recent rapid pressure increases of the reactor coolant system
(RCS) at several plants and the overpressurization of the RCS at another. 

ACTION REQUESTED OF LICENSEES: 

Please provide the following information in writing to this office within 30
days after receipt of this Bulletin: 

1.   Provide a description of reactor coolant system temperature and 
     pressure instrumentation which allows you to verify adherence to the 
     temperature/pressure limitations in your technical specifications. 
     
2.   If you do not have the capability to continuously record reactor 
     coolant system temperature and pressure during heatup and cooldown as 
     well as during power operation, describe what action you have taken or 
     plan to take to provide assurance that the temperature/pressure 
     limitations in your technical specifications are met. 
     
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