ML20132B753
| ML20132B753 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 02/07/1984 |
| From: | Lefevre H Office of Nuclear Reactor Regulation |
| To: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19264D658 | List:
|
| References | |
| FOIA-85-353 NUDOCS 8402160616 | |
| Download: ML20132B753 (11) | |
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1 MEI10P.A!!DUM FOR:
Robert E. Jackson, Chief i
Geosciences Brancn, DE THRU:
'.. Stephan Brocoum, Leaoer 1
' ' Geology Section, GSB, DE FROM:
Harold E. Lefevre, Geologist Geology Section, GSB, DE
SUBJECT:
MOUNT ST. HELENS VOLCANO-ERUPTION ALERT Early Sunday evening (Pacific Standard Time), the U. S. Geological Survey and the University of Washington issued a Volcano Alert indicating that an eruption of Mount St. Helens is likely to begin within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. This prediction is based upon a marked increase in the level of background seismicity (the largest earthquake reported in the current series has been a magnitude 2.8 event) coupled.with a rather rapid dome growth.
The eruption, if it were to occur, would most likely consist of an explosion caused by lave dome pressurization and subsequent failure followed by an essentially vertical ash column and perhaps a nud flow on the north flank of the volcano. According to Mount St. Helens l'edia Center personnel neither the ash cicud nor the possible mudflow is expected to present a hazard to the nearby communities.
The ash would be ejected to high altitudes and then dispersed thinly over a wide area, while the north slope mud flow, lacking little natural lubricant (melted snow) because of the minimal snow pack, would be rather small.
The mudflow is not expected to reach Spirit Lake.
Based upon the above-described eruption effects (widely dispersed minimal ash fall and possible mudflow on the north flank of the volcano) neither the Trojan plant, some 35 air miles west of the vcicano nor the more distant WPPSS facilities at Satsop and at the Hanford Reservation, would be affected.
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February 14, 1984 4
i Preliminary Agenda for Meeting Trojan - Spirit Lake - Mount St. Helens February 23, 1984
_3
- j I.
USGS Presentation
- I 1.
USGS Report 82-4125 "Mudflow Hazards Along the Toutle and Cowlitz Rivers from a Hypothetical Failure of Spirit Lake Blockage", as it relates to study done for NRC 2.
Study done for NRC a) Bases for assumptions
- 1) which assumptions are reasonable j
- 2) which assumptions are conservative b) Conclusions regarding potential impacts on Trojan 3.
Status of USGS's long tenn FEMA study for the Columbia River.
II.
PG&E Presentation 1.
Simons, Li Report III.
Group Discussion 1.
USGS views on S.imon, Li Report & NRC's comments on the Simons, Li Report 2.
Discussion between NRC, PG&E and consultant, and USGS on differences between PG&E's Simons, Li Report and USGS's NRC report 3.
Need for further analyses and evaluations
.=
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--