ML19289A902

PNO-V-80-23:on 800324,seismic Activity Near Mount St Helens Has Increased Steadily to Approx 40 Events Per Hour. No Motion or Effects Observed by Reactor Site Personnel. Volcanic Activity Concluded to Present Minimal Risks

ML19289A902
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	03/26/1980
From:	Crews J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-80-023, PNO-V-80-23, NUDOCS 8005010250
Download: ML19289A902 (2)

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80060 2'5 0 PRELIMINARY NOTIFICATDN g

PREllMIRARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-V: 80-23 Date:

March 26,19!

This preliminary notification constitutes EARLY notice of events of POSSIBLE

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safety or_ public interest s'ignifignce.

The information presented is,as initial 1y_

received without verificati~on or evaluation and is basically all that i,s__known by TETtXf( 'on ih,1 s.l,da te.

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Facility:

Portland General Electric Company Trojan Nuclear Plant Rainier, Oregon Docket No. 50-344

Subject:

RECENT INCREASE 0 ' SEISMIC ACTIVITY NEAR MOUNT ST. HELENS,; WASHINGTON There have been reports over the past several days of increased seismic activity nea.r Mount St. Helens, approximately 33 miles ENE of the Trojan site.

Seismic activity has increased steadily to approximately 40 events (tremors) per hour.

The strongest event was reported es 4,4 Richter on the afternoon of March 24.

No mation or other effects have been observed by Trojan site personnel, nor has any motion been detected on the plant seismic monitoring instrumentation.

Increased seismic ectivity is considered to be one of the early warnings of volcanic activity.

Volcanic eruption, which last occurred at Mount St. Helens in 1857, has been considered in the siting of the Trojan plant and concluded to present minimal risk to the plant.

The Trojan plant is currently operating at approximately 65% power, on "coastdown" in preparation for refueling which is scheduled to comence on April 9,1980.

The NRC Resident Inspectors are continuing to follow reports of seismic or other signs of volcanic ac.ivity in the area of Mount St. Helens, and have been in coninunication with WRC Headquarters personnel.

There has been substantial media coverage of this occurrence, both locally and nationally, CONTACT:

J. L. Crews, RV 463-3736 s

Distribution:

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'C'h' airman Ahearne Comnlssioner Bradford S. J. Chilk SECY. -

Counissioner Kennedy Commissioner Hendrie C. C. Kammerer CA.'

Connissioner Gilinsky ACRS (For Distribution)

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W. J. Dircks, C. junwarmplEDO.

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R. C. DeYoung,.NRR

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J. J. Fouchard, PA_.

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N. M. Hall er, !MPA:..

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_D. Vassallo, NRR-J. J. Commings, 01A

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M-PNO-V: 80-23 (Con't.) March 26, 19EC The Region V (San Francisco) office was notified of.this occurrence by t e Resident h

Inspector and NRC Headquarters personnel on.the afternoon of March 25,19e0.

The infonnation is current as of 9:00 AM on March 26, 1980.

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