ML20050V745
| ML20050V745 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/13/1982 |
| From: | NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD) |
| To: | NRC ATOMIC SAFETY & LICENSING APPEAL PANEL (ASLAP) |
| Shared Package | |
| ML20050V598 | List: |
| References | |
| NUDOCS 8204150062 | |
| Download: ML20050V745 (1) | |
Text
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-- would, through use of the slip-rate methodology, support their position that the appropriate SSE would be magnitude 7.5.
(Brief at 35-36.)
Intervenors ignore, however, the Licensing Board's finding, and the substantial testimony supporting it, which justify excluding the San Miguel fault from the slip-rate approach because of the significant uncertainties regarding the ability to derive a slip-rate for it (PID FFs 111-113 at 95-98; see also, Slemmons, Tr. 6290, line 8 - 6293 line, 8).
This argument, then, should be viewed as based on nothing more than unfounded speculation and rejected.
In conclusion, the Licensing Board gave proper weight to the slip-rate methodology as one of several approaches used to confirm the acceptability of a magnitude 7 event on the 0ZD as the SSE.
c.
Intervenors, in several places, complain that the bounding line is controlled by but a few data points.
Intervenors miss the point. The slip-rate methodology has taken account of all relevant world-wide data and the HEL and MEL bounding lines are just that - lines which in fact bound all the data; they are not regression lines.
Conservatism is inherent in the MEL in that the bounding line drawn includes an assumed error in both slip-rate and magnitude; while the slip-rate on the NIZD is about 0.5 mm/ year, the MEL is drawn for a slip-rate of 0.68mm/ year and while the magnitude of the controlling event is M =6.3, the MEL is drawn for a magnitude 6.5 event (Slemmons. Tr.
3 6295-6297, line 14).
In light of the fact that all relevant data are accounted for and the bounding line drawn for the MEL includes a double element of conservatism, Intervenors', concern is without substance.
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