ML20140F342

Discusses 860319 Telcon w/Morrison-Knudsen Re Bodo Canyon Preliminary Design for Remedial Action Plan.Proposed Apron Inadequate to Handle Combined Flows from Off Pile & from Diversion Ditches

ML20140F342
Person / Time
Issue date:	03/20/1986
From:	Johnson T NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:	Hawkins E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-WM-48 NUDOCS 8603310372
Download: ML20140F342 (2)

Text

, DISTRIB M N WM s/f (48 WMGT r/

NMSS R/F MAR 2 01986 REBrowning

.M/86/03/-19 MBell JBunting PJustus TJohnson r/f PDR MEMORANDUM FOR: E. Hawkins, URF0 FROM: T. Johnson, WMGT

SUBJECT:

TELECON WITH MORRISON-KNUDSEN REGARDING BOD 0 CANYON PRELIMINARY DESIGN By letter dated March 4, 1986, Morrison-Knudsen Co. (M-K) requested my comments on a conceptual, preliminary design for the Bodo Canyon (Durango) remedial action plan. M-K submitted several preliminary drawings for review, prior to finalizing the design later this month.

In accordance with the request, I called Fred Feliz on March 19, 1986 to discuss my preliminary comments on the design concept. During our conversation, I made the following points:

1. I indicated that it was doubtful that the propnsed apron (with a D 50 rock size of only 6") was adequate to handle the combined flows from off the pile and from the diversion ditches.

2. I indicated that the erosion protection (D 50 of only l'_2') for the channel to the north of the site was probably not adequate, due to the existing steep channel slopes. WM Record file WM Project N ._

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3. I indicated that the ditch or apron termination point should have rock which should.be placed at least to the deoth.of the existing gully. I also indicated that the. ditch could probably be shortened somewhat, if this was done.

4. I indicated that I was concerned about the berms and the fill that will be placed in the existing gullies and arroyos. I suggested that this fill showed be protected by a rock layer to prevent future gully formation. '

M-K indicated that these suggestions were much appreciated and would be taken under advisement during the development of the final plan. M-X indicated that they expected to make further revisions to this plan, based on the results of a meeting that was held in San Francisco on March 17, with the TAC.

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T. Johnson, WMGT

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