ML20134A483

Informs of 840223 Meeting W/Usgs & Util to Discuss Analysis of Flooding Consequences of Breakout of Spirit Lake Blockage at Facility

ML20134A483
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	02/21/1984
From:	John Miller Office of Nuclear Reactor Regulation
To:	Eisenhut D Office of Nuclear Reactor Regulation
Shared Package
ML20132B592	List: IA-85-353, Summary of 840223 Meeting W/Util Re Spirit Lake Blockage & Flooding Potential.List of Attendees & Viewgraphs Encl ML20132B587 ML20132B759 ML20134A181 ML20134A222 ML20134A244 ML20134A330 ML20134A375 ML20134A393 ML20134A422 ML20134A483 ML20134A495 ML20134A516
References
FOIA-85-353 TAC-49636, NUDOCS 8508150322
Download: ML20134A483 (6)

Text

, . . _ _ _ - -. _ _

g# Iog UNITED STATES idd NUCLEAR REGULATORY COMMISSION i

, y g 1 WASHINGTON, D, C 20555 3 E 1 o  !

\*..../ FEB 21 1984 MEMORANDUM'FOR: Darrell G. Eisenhut, Director Division of Licensing THRU: G. C. Lainas, Assistant Director for Operating Reactors, DL /

FROM: James R. Miller, Chief Operating Reactors Branch #3, DL

SUBJECT:

SPIRIT LAKE BLOCKAGE STATUS - TROJAN We will be meeting with the USGS and Portland General Electric Company on l February 23 to review the PGE analysis of the flooding consequences at. Trojan of a breakout of Spirit Lake blockage. The PGE analysis, conducted by Simons, l

Li &' Associates, shows a maximum flood elevation at the Trojan site of 39 4 feet; Trojan is designed for a flood to el. 45 feet.

We have prepared a memo to DE for your signature which recuests DE to pro-l vide an interim Safety Evaluation by March 2 and a final SE by April 6. The j

memo also states that OL is prepared to assist with funding if needed.

! Based on our current knowledge: (1) should the Spirit Lake blockage f ail,

! Trojan will be immediately notified and will have approximately 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> to j shutdown (procedures are in effect that require shutdown), (2) there is a j very low crocability of Spirit Lake dam failure since the Corps of Engineers j has the lake punced down to acccamodate spring thaws (the level is approxi-

! mately ecual to 14 feet below what is considered a saf,e level). Due to in-l creased Mount St. Helens volcanic activity the pumping station was abandoned; howevec the pumping station has been manned since February 11; and (3) the Columbia, river flow is average and well below flows of concern.

The very conservative analysis conducted by USGS showed flooding above grade at Trojan for 'several cases studied. For the high water case, a Columbia River flow cf about 685,000 cfs would be required. We intend to continue to daily uni w the Columbia River flow until the USGS (our consultant) and PGE have resolved the differences in their flood models and a decision is made by the technical staff as to the appropriate maximum flood at the Trojan site.

? In the meantime should the Columbia River flow increase to approximately 600,000 cfs we will inform you and discuss a more immediate action with regarc j to operation of Trojan. The hydrologis s in DE are monitoring river flow

! daily. The $25,000 cfs value represents a flooc with a recurrence intemal of

! approximately 16 years.

4 l With your concurrence we will prcceed as stated above.

., . . I

, James R. Miller, Chief Ocerating Reactors Branch #3, DL ,

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