ML20137U063

Requests Addl Info on Erosion of Cement from Underlying Porous Concrete Drainage Sys

ML20137U063
Person / Time
Site:	Millstone
Issue date:	04/11/1997
From:	Andersen J NRC (Affiliation Not Assigned)
To:	Carns N, Laudenat R NORTHEAST NUCLEAR ENERGY CO.
References
TAC-M96402, NUDOCS 9704160277
Download: ML20137U063 (5)

Text

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' y s UNITED STATES g ,,' Y ' j NUCLEAR REGULATORY COMMISSION j o f WASHINGTON, D.C. 20565-0001 1

%  ! April 11, 1997 Mr. Neil S. Carns Senior Vice President and Chief Nuclear Officer Northeast Nuclear Energy Company c/o Mr. Richard T. Laudenat Director - Regulatory Affairs P.O. Box 128 Waterford, CT 06385

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON EROSION OF CEMENT FROM THE UNDERLYING POROUS CONCRETE DRAINAGE SYS'!EM, MILLSTONE UNIT 3 (TAC NO. M96402)

Dear Mr. Carns:

By letter dated Feoruary 28, 1997, Northeast Nuclear Energy Company (NNECO) provided an engineering evaluation of the Phase III Containment Basemat Mock-Up Testing Report for Millstone Unit 3. The mock-up testing performed at the Alden Research Laboratory (ARL) was an effort by NNECO to obtain a better understanding of the cement erosion observed from under the Millstone Unit 3 containment foundation basement. This issue is being reviewed by the Office of Nuclear Reactor Regulation (NRR) for disposition prior to Millstone Unit 3 startup and is included in the NRC's Millstone Unit 3 Restart Assessment Plan.

The NRC staff's review will be documented in a future inspection report.

On March 19, 1997, members from NRR toured the mock-up at ARL. During the tour and followup discussions, your staff addressed many of the questions the NRC had concerning the mock-up testing and the monitoring of the Millstone Unit 3 basemat. During these discussions, your staff mentioned several reports which the NRC would like to review, specifically the root cause analysis and residual strength assessment, the porous concrete materials properties evaluation, and the containment structure seismic assessment. It is the NRC's understanding that these reports should all be completed by the middle of April 1997. In order to support further NRC evaluation of this issue, please provide these documents to the NRC by the end of April 1997. /p NRC FILE CENTER CO 160026 9704160277 970411 PDR ADOCK 05000423 P PDR

f Neil S. Carns In addition, it is the NRC's understanding that NNECO's evaluation for this issue is scheduled to be completed by July 1, 1997. As stated above, in order for the NRC to complete its evaluation of this issue prior to restart, NNECO's evaluation is requested to be submitted as soon as possible after its completion.

Sincerely,

/

ames W. Andersen, Project Manager

'Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423 cc: See next page l

l l

J

Neil S. Carns '

April 11, 1997 In addition, it is the NRC's understanding that NNECO's evaluation for this issue.is scheduled to be' completed by July 1, 1997. As stated above, in order for the NRC to complete its evaluation of this issue prior to restart, NNECO's

' e' val'uation is requested to be submitted as soon as possible after its compl.etion.

Sincerely, Original signed by:

James W. Andersen, Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423 cc: See next page DISTRIBUTION:

Docket File?

PUBLIC SP0-L Plant SP0 Reading WTravers 1 PMcKee LBerry JAndersen 0GC ACRS JDurr, RI DOCUMENT NAME: G:\ANDERSEN\M96402.RAI *see previous concurrence To recsive a copy of this document, Indicate in the box: "C" = Copy without ettechment! enclosure "E" = Copy with a,ttj cifnent/ enclosure "N" = No copy 0FFICE SPD-L:PM /l *SP0-L:LA l ECGBd6!Mi\ , . SP0/I;bD l l NAME JAndersen i LBerry GBagcNi e 24 't Vr) PMdVh4 DATE 04/1o /97 (/f 03/24/97 04/' /s7 04/\\/97 0FFICIAL RECORD COPY l

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. Northeast Nuclear Energy Company Millstone Nuclear Power Station Unit 3 cc:

Lillian M. Cuoco, Esquire Mr. William D. Meinert Senior Nuclear Counsel Nuclear Engineer Northeast Utilities Service Company Massachusetts Municipal Wholesale P.O. Box 270 Electric Company Hartford, CT 06141-0270 P.O. Box 426 Ludlow, MA 01056 Mr. Kevin T. A. McCarthy, Director Monitoring and Radiation Division Joseph R. Egan, Esquire Department of Environmental Protection Egan & Associates, P.C.

79 Elm Street 2300 N Street, NW Hartford, CT 06106-5127 Washington, D.C. 20037 Regional Administrator, Region I Mr. F. C. Rothen U.S. Nuclear Regulatory Commission Vice President - Nuclear Work Services i 475 Allendale Road Northeast Nuclear Energy Company i King of Prussia, PA 19406 P.O. Box 128 )

Waterford, CT 06385 l First Selectmen Town of Waterford Ernest C. Hadley, Esquire Hall of Records 1040 B Main Street i 200 Boston Post Road P.O. Box 549  :

Waterford, CT 06385 West Wareham, MA 02576 Mr. Wayne D. Lanning Mr. John Buckingham l Deputy Director of Inspections Department of Public Utility Control l Special Projects Office Electric Unit 475 Allendale Road 10 Liberty Square  :

King of Prussia, PA 19406-1415 New Britain, CT 06051 l Michael H. Brothers Mr. James S. Rcbinson Vice President - Millstone Unit 3 Manager, Nuclear Investments and Northeast Nuclear Energy Company Administration P. O. Box 128 New England Power Company  !

Waterford, CT 06385 25 Research Drive Westborough, MA 01582 Burlington Electric Department c/o Robert E. Fletcher, Esq. Mr. D. M. Goebel 271 South Union Street Vice President - Nuclear Oversight Burlington, VT 05402 Northeast Nuclear Energy Company P.O. Box 128 Mr. M. R. Scully, Executive Director Waterford, CT 06385 Connecticut Municipal Electric Energy Cooperative Mr. Mr. K. Thayer 30 Stott Avenue Recovery Officer - Nuclear Engineering Norwich, CT 06360 and Support Northeast Nuclear Energy Company P. O. Box 128 Waterford, Connecticut 06385

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. Northeast Nuclear Energy Company Millstone Nuclear Power Station l Unit 3 l

CC:

Deborah Katz, President Citizens Awareness Network P.O. Box 83 Shelburne Falls, MA 03170 Senior Resident Inspector Millstone Nuclear Power Station c/o U.S. Nuclear Regulatory Commission P.O. Box 513 Niantic, CT 06357 Mr. Allan Johanson, Assistant Director Office of Policy and Management Policy Development and Planning Division 450 Capitol Avenue - MS# 52ERN P. O. Box 341441 Hartford, CT 06134-1441 Citizens Regulatory Commission ATIN: Ms. Susan Perry Luxton 180 Great Neck Pvad l Waterford, Connecticut 06385 Mr. B. D. Kenyon President and Chief Executive Officer Northeast Nuclear Energy Company P.O. Box 128 Waterford, CT 06385 The Honorable Terry Concannon Mr. Evan Woolacott Co-Chairs Nuclear Energy Advisory Council Room 4035 Legislative Office Building Capitol Avenue Hartford, Connecticut 06106 d