ML18038A576

Forwards Responses to NRC Re Const of Revetment Ditch Sys at Facility.One Oversize Figure Encl.Aperture Card Is Available in PDR

ML18038A576
Person / Time
Site:	Nine Mile Point
Issue date:	02/18/1983
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8302250412
Download: ML18038A576 (17)

Text

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REGULATORINFORMATION DISTRIBUTION -%TEN (RIDS)

ACCESSION NBR;8302250412 DOC.DATE: 83/02/18 NOTARIZED:

NO DOCKET 0

FAOIL:50-410 Nine Mile"Point Nuclear "Station~

UniIt "2i Niagara Moha 05000410 AUTH'AME AUTHOR AFFILIATION MANGANiC ~ VS Ni agar a Mohawk Power Cor p, RBCIP ~ NAME RECIPIENT AFFILIATION SCHHENCERgA ~

Licensing Branch '2 SUBJECT!

Forwards responses iito NRC 830127 litr re const of revetmerIt di'tch sys.at facili)ty,One oversize.figure <<encl'pertune card is available in<<POR ~

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Dear Mr. Schwencer:

Re:

Nine Mile Point Unit 2 Docket No. 50-410 In a letter dated January 27, 1983 from Mr. Schwencer to G. Rhode, two questions were provided regarding the construction of the revetment ditch system at Nine Mile Point Unit 2.

The questions and responses are enclosed.

Sincerely, CVM/NLR:ja Enclosure C.

V. Mangan, Vice President Nuclear Engineering 5 Licensing

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g As certain items cited in references 2 and 3 are no longer applicable to the final revetment ditch design, provide a detailed drawing of the revetment ditch system which indicates the following details:

A.

Gradation specifications thickness and slopes of the various quarry stones under and filter layers comprising the revetment ditch system.

B.

Gradation of the insitu soil.

C.

Type, weight and dimension of the primary concrete armor units, as well as the basis for, and details of, the revetment reinforcement for the armor units.

Res onse 1

A.

The gradation thicknesses and slopes of the quarry stone layers in the revetment ditch system are shown in Figure 1.

The gradation requirements of the two zone granular filter medium are illustrated in Figure 2.

B.

A typical gradation curve of the insitu soil for which the granular filter medium were designed is shown on figure 3.

C.

Details regarding type, weight and dimensions of the 4900 pound dolosse are shown in Figures 4 and 5.

Each dolos unit contains approximately 4X of epoxy coated reinforcing steel by weight.

The reinforcing steel arrangement is shown on Figure 6.

The basis for reinforcement of the armor units is to obtain the desired weight and maintain the integrity of the units.

uestion 2

Provide detailed information on the descriptions and properties of the overburdened soil proposed to be left in place below the slopes of the ditch.

Describe how the stability of this material was investigated.

Provide details and results of your stability investigations.

Res onse 2

As shown on Figure 1, all existing materials (insitu) below the slopes of the ditch shall be excavated and replaced with quarry stone materials.

Therefore, no stability analysis on a natural soil zone below the ditch was performed.

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REVETMENT DITCH PLAN AND TYPICALSECTIONS NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2