ML18017A684

Quarterly Seismic Monitoring Rept for Jul-Sept 1979

ML18017A684
Person / Time
Site:	Harris
Issue date:	10/29/1979
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML18017A683	List: ML18017A682 ML18017A684
References
NUDOCS 7911010380
Download: ML18017A684 (2)

Text

Quarterly Data Report SHNPP Seismic Monitoring Program Jul 1 1979 Se tember 30 1979 Carolina Power & Light Company has completed another quarter of operation of its seismic monitoring program at the Shearon Harris Nuclear Power Plant site near New Hill, North Carolina. During this period a total of 166 cultural events were recorded with an S-P of less than 5 seconds. No local earthquakes were detected.

Of these 166 'events, 151 were confirmed as being explosions by the respon-sible companies or agencies. The remaining 15 events displayed the signature and arrival pattern of previously identified cultural events and all of them occurred during daylight hours. Only one of these events was recorded on a weekend or holiday:

GMT S-P Date ~Da at Sta. 4 at Sta. 4 Probable Source 7/4/79 Independence Day 13:16:23.3 4,4 Highway Construction The signature and arrival pattern of this event are identical to 12 other events recorded during this quarter that were confirmed as being explosions from highway construction.

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