ENS 44675
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ENS Event | |
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19:08 Nov 21, 2008 | |
Title | Offsite Notification and Media Briefing Due to Potential Discovery of Offshore Fault Near Plant |
Event Description | As part of the ongoing seismic monitoring program, PG&E [Pacific Gas & Electric] in conjunction with the US Geological Survey (USGS) is studying a pattern of seismic activity in close proximity to the Diablo Canyon Power Plant (DCPP). The discovered pattern of seismic activity suggests a potential offshore fault near DCPP. PG&E and the USGS were previously unaware of this potential fault. Initial evaluation shows that the potential fault is closer to DCPP and much smaller than the Hosgri fault, which is the current bounding seismic feature for DCPP.
Initial assessment indicates that the ground motion from this potential fault is expected to be bounded by the existing seismic design basis for DCPP. The possible impact of this potential fault, including potential ground deformation is the subject of an ongoing evaluation. Given the available data, PG&E and the USGS estimate that it will take up to a year to determine if a seismic fault exists. This issue was discussed with US NRC Region IV and Office of US NRC Nuclear Reactor Regulation on November 21, 2008. PG&E is planning a media briefing. The licensee has notified the NRC Resident Inspector. |
Where | |
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Diablo Canyon California (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
Time - Person (Reporting Time:+-5 h-0.208 days <br />-0.0298 weeks <br />-0.00685 months <br />) | |
Opened: | Murrell Evans 14:08 Nov 21, 2008 |
NRC Officer: | Howie Crouch |
Last Updated: | Nov 21, 2008 |
44675 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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