ML17053C530

Approves Use of Dywidag Threadbar Sys,In Staggered Application,Subj to Listed Conditions.Also Approves Use of Unstaggered Dywidag Splices,Subj to Listed Conditions & Limitations

ML17053C530
Person / Time
Site:	Nine Mile Point
Issue date:	04/13/1981
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Rhode G NIAGARA MOHAWK POWER CORP.
References
NUDOCS 8104200056
Download: ML17053C530 (6)

Text

'ocket No.:

50-410 APR Niagara Mohawk Power Corporation ATTN:

Mr. Gerald K. Rhode Vice President System Project Management 300 Erie Boulevard Hest

Syracuse, New York 13202

Dear Mr. Rhode:

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Subject:

Use of DYWIDAG Threadbar System at Nine Mile Point, Un We have completed our review of your submittal, dated March 18,

1981, the limited use of the DYWIDAG Threadbar System at Nine Mile Point, Uni which you sent in response to our letter of March 5, 1981 and the meeting held in Bethesda, Maryland on March 6, 1981.

Specifically, you requested approval of the DYWIDAG Threadbar System for splicing of reinforcing steel bars in unstaggered applications used in con-junction with doweling at slab-to-wall connections.

You presented calculations for floor slabs in the reactor building which indicate that, under all applicable loading conditions, the maximum stress level in the dowels viill be below 50Ã of the specified yield strength of the bar.

The staff determined that the calculations are acceptable for these locations.

The staff finds that the statistical summaries of strain data, for bar sizes ¹6 through ¹11 at strain levels corresponding to 505 and 90K of the yield strength of the appropriate bar are acceptable Regarding minimum spacing criteria for splices in this application, the staff agrees with your proposal that the minimum clear distance between parallel splices be at least six inches and not less.,than six times the nominal diameter of the bar.

Finally, the staff. finds acceptable the discussion, calculations, and data you submitted to show that the group tensile test is not necessary for this limited application.

Based on your response as indicated above, we approve the u'se of the DYHIDAG,(

Threadbar ystem at Nine Mile Point, Unit 2, in staggered application, subjec't to the following conditions:

I.

Compliance with the applicable provisions of Section III, Division 2 of ASME boiler and Pressure Vessel

Code, 1980 Edition, including the Summer 1980 addenda; 2.

Compliance with the applicable provisions of Sections 7.5 and 7.6 of ACI 349-76 Code, "Code Requirements for.Nuclear Safety Related Concrete Structures."

I1.'FFICE/

SURNAMEtP DaVE f>

NRC FORM 318 (10/80) NRCM 0240

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II I Nr. Gerald K. Rhode 2

In addition, we approve the use of unstaggered DYMIDAG splices, subject to the following conditions and limitations:

1.

2.

3.

Compliance with the above referenced codes.

Limited to bar,sizes 86 through 811 Limi'ted to doweling at junctions between the secondary containment wall and slabs of the reactor building.

Sincerely, cc:

See next page B. J. Youngblood, Chief Licensing Branch No.

1 Division of Licensing OFFICE/

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NRC FORM 318110/801NRCM 0240 OFFICIAL RECORD COPY-w I1SGPO.'980-329 824

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0 Niagara t1ohavik Power Corporation ccs:

Eugene B.

Thomas, Esq.

LeBoeuf, Lamb, Leiby 5 HacRae 1333 New Hampshire Avenue, N.tl.

Suite 1100 Mashington, 'D.

C.

20036 Anthony Z. Roisman, Esq.

Natural Pesources Defense Council 917 5th Street, N. lJ.

Washington, D.

C.

20005 Nr. Richard Goldsmith Syracuse University College or Lavi E. I. 'white Hall Campus

Syracuse, New York '3210 T,

K. DeBoer, Director Technologica'l Development Programs New York State Energy Office Agency Building 2 Empire State Plaza

Albany, Nevi York.12223 Resident Inspector Nine Nile Point Nuclear Power Station P. 0.

Box 126

Lycoming, Nevi York 13093 Ezra I. Bialik Assistant Attorney General Environmental Protection Bureau Nevi York State Department of Lavi 2 World Trade Center Nevi York, llew York 10047

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