Seismic (SM)

Question 1

What is the acceleration of a Safe Shutdown Earthquake?

Answer 1

0.20g or about 6.0 on the Richter Scale
“Maximum earthquake potential considering the regional and local geology and seismology that would produce maximum ground motion”.

Question 2

What is the acceleration of a Operational Basis Earthquake?

Answer 2

0.10g
“The vibratory ground motion for which those features of the plant necessary for continued operation without undue risk to the health and safety of the public will remain functional”

Question 3

Which design earthquake (OBE or SSE) is the maximum potential for the area of Tonopah?

Answer 3

(SSE) Safe Shutdown Earthquake

Question 4

How long after an OBE is exceeded does Civil have to perform a level 2 analysis?

Answer 4

7 days

Question 5

What is the STA determining in the level 1 seismic analysis?

Answer 5

Did an event occur that exceeded an OBE?

Question 6

What action is required if an OBE is exceeded?

Answer 6

Shutdown the plant (mode 3 to mode 5) and perform engineering analysis