ML20059M047

Advises That NRC Does Not See Need for Formal Relief from ASME Code Section XI to Repair Leak in Svc Water Piping

ML20059M047
Person / Time
Site:	Millstone
Issue date:	09/14/1990
From:	Vissing G Office of Nuclear Reactor Regulation
To:	Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO.
References
GL-90-05, GL-90-5, TAC-77514, NUDOCS 9010030019
Download: ML20059M047 (4)

Text

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i September 14, 1990

., Docket No. 50-336 ]

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Mr. Edward J. Mroczka  !

Senior Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company  :

Northeast Nuclear Energy Company l P.O. Box 270 i Hartford, Connecticut 06141-0270

SUBJECT:

NNECO RELIEF REQUEST FROM ASME CODE SECTION XI REQUIREMENTS l DATED AUGUST 10, 1990 (TAC NO. 77514)  :

l

By letter ' dated August 10, 1990, you re

Nested, in response to NRC Generic Letter 90-05, relief from ASME Boiler and Pressure Vessel Code Section XI requirements pursuant to 10 CFR 50.55a(g)(6)(1). The particular request related to a leak in the servico water piping and request for relief for temporary noncode repair in order to continue operation.

During my recent visit to Millstone 2, I observed the particular leak in the service water system and noted that there was in place a stopgap measure to  ;

limit the leakage from the pipe. We have determined that, stopgap measures to limit leakage in Class 3 piping do not require NRC approval as long as the structural integrity is not affected and the stopgap measure is reve siole, that is, the flawed piping can be returned to the as-found flawed condition.

We understand that you have determined there is adequate structural integrity in the flawed piping in accordance with the criteria of Generic Letter 90-05.

Also, since you intend to repair the flawed piping by replacing it with new i piping during the refueling shutdown beginning September 15, 1990, we do not see the need for formal relief.

Sincerely, original signed by Guy Vissing l

Guy S. Vissing, Senior Project Manager Project Directorate I-4 ',

Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc: See next page

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/ September 14, 1990 Docket No. 50-336 1

Mr. Edward J. Mroczka Senior Vice President ,

Nuclear' Engineering and Operations

, Connecticut Yankee Atomic Power Company ,

Northeast Nuclear Energy Ccapany  !

P.O. Box 270

• Hartford, Connecticut 06141-0270

SUBJECT:

NNECO RELIEF REQUEST FR0h ASME CODE SECTION XI REQUIREMENTS DATED AUGUST 10, 1990 (TAC NO. 77514)

By letter dated August 10, 1990, you requested, in response to NRC Generic Letter 90-05, relief from ASME Boiler and Pressure Vessel Code Section XI requirements pursuant to 10 CFR 50.55a(g)(6)(1). The particular request j related to a leak in the service water piping and request for relief for '}

temporary noncode repair in order to continue operation. j During my recent visit to Millstone 2. I observed the particular leak in the service water system and noted that there was in piece a stopgap measure to limit the leakage from the pipe. We have detemined that stopgap measures to limit leakage in Class 3 piping do not require NRC approval as long as the r structural integrity is not affected and the stopgap measure is reversible, that is, .no flawed piping can be returned to the as-found flawed condition.

We understand that you have determined there is adequate structural integrity in the flawed piping in accordance with the criteria of. Generic Letter 90-05.  ;

Also, since you intend to repair the flawed piping by replacing it

• 5 new piping during the refueling shutdown beginning September l'i,1990, w do not see the need for formal relief.

Sincerely,

/.

Guy S. Vissing Senior Project Manager Project Directorate I-4 Division of Reactor Projects - I/II Office of. Nuclear Reactor Regulation ec: See next page

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Mr. Edward J. Mroczka Millstone Nuclear Power St'ation Northeast Nuclear Energy Company Unit No. 2 .

]

] CC.

Gerald Garfield, Esquire R. M. Kacich, Manager Day, Berry and Howard "eneration Facilities Licensing i i Counselors at Law Northeast Utilities Service Company l City Place Post Office Box 270 Hartford, Connecticut 06103-3499 Hartford, Connecticut 06141-0270 ,

W. D. Romberg, Vice President D. O. Nordquist Nuclear Operations Director of Quality Services

, Northeast Utilities Service Company Northeast Utilities Service Company Post Office Box 270 Post Office Box 270 i Hartford, Connecticut 06141-0270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Regional Administrator ,

Radiation Control Unit Region I  :

Department of Environmental Protection U. S. Nuclear Regulatory Commission State Office Building 475 Allendale Road Hartford, Connecticut 06106 King of Prussia, Pennsylvania 19406 Bradford S. Chase, Under Secretary First Selectmen Energy Division Town of Waterford Office of Policy and Management Hall of Records 80 Washington Street 200 Boston Post Road Hartford, Connecticut 06106 Waterford, Connecticut 06385 S. E. Scace, Nuclear Station Director W. J. Raymond, Resident Inspector Millstone Nuclear Power Station Millstone Nuclear Power Station Northeast Nuclear Energy Company c/o U. S. Nuclear Regulatory Commission Post Office Box 128 Post Office Box 811  !

Waterford, Connecticut 06385 Niantic, Connecticut 06357 J. S. Keenan, Nuclear Unit Director Charles Brinkman, Manager Millstone Unit No. 2 Washington Nuclear Operations Northeast Nuclear Energy Company C-E Power Systems l Post Office Box 128 Combustion Engineering, Inc.

Waterford. Connecticut 06385 12300 Twinbrook Pkwy Suite 330 Rockville, Maryland 20852 1

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DISTRIBUTION

[gf.. Docket File;f -y NRC & Local PDRs Plant File S. Varga (14E4)

B. Boger (14A2)

J. Stolz S. Norris G. S. Vissing j OGC (for information only)

E. Jordan (MNBB 3302)

ACRS (10)

E. Wenzinger (Region I)

C. Y. Cheng '

K. Jabbour S. Newberry i

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