Probability of pipe failure in the reactor coolant loop of Westinghouse PWR plants. Volume 3. Guillotine break indirectly induced by earthquakes
Technical Report
·
OSTI ID:6019424
The requirements to design nuclear power plants for the effects of an instantaneous double-ended guillotine break (DEGB) of reactor coolant loop (RCL) piping have led to excessive design costs, interference of normal plant operation and maintenance, and unnecessary radiation exposure of plant maintenance personnel. This report describes an aspect of the NRC/Lawrence Livermore National Laboratory sponsored research program aimed at investigating whether the probability of DEGB in RCL piping of nuclear power plants is acceptably small and the requirements to design for the DEGB effects (e.g., provision of pipe whip restraints) may be removed. This study estimated the probability of indirect DEGB in RCL piping as a consequence of seismic-induced structural failures within the containment of Westinghouse supplied pressurized water reactor nuclear power plants in the United States. The median probability of indirect DEGB was estimated to be about 3x10/sup -6/ per year with a 10% to 90% subjective probability range approximately from 1x10/sup -7/ per year to 5x10/sup -5/ per year.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6019424
- Report Number(s):
- NUREG/CR-3660-Vol.3; UCID-1988-Vol.3; ON: TI85008034
- Country of Publication:
- United States
- Language:
- English
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WATER MODERATED REACTORS