ML20137N255

Submits Corrective Actions for Svc Water Supply & Return Lines for Spent Fuel Pool Heat Exchanger

ML20137N255
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	04/02/1997
From:	Haseltine J CONNECTICUT YANKEE ATOMIC POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CY-97-036, CY-97-36, NUDOCS 9704080308
Download: ML20137N255 (2)

Text

, e a

, ONNECTICUT YANKEE ATO MIC POWER COMPANY HADDAM NECK PLANT 362 INJUN Hollow ROAD e EAST HAMPToN. CT 06424-3009 April 2,1997 Docket No. 50-213 CY-97-036 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Haddam Neck Plant Corrective Actions for Service Water Supply and Return Lines for the Soent Fuel Pool Heat Exchanger On March 25,1997, during a planned ultrasonic inspection of the six inch spent fuel pool heat exchanger service water return line, indication of pipe wall thinning was found. The pipe wall thinning was previously identified during a routine inspection for microbiologically influenced corrosion and found to be acceptable.

The current inspection indicated a localized reading which exceeded the maximum allowed ASME code depth. As a result, the inspection scope was increased and five additionalinspections were performed. Allinspection results were greater than the minimum requirement. However, one location had minimal margin.

Based on the results of these inspections, two pieces of service water return line piping will be replaced. Additionally, other locations within the service water return line with different flow regimes will be inspected. /

1

)-

This additional work required on the service water system will affect a previous commitment to have the service water system returned to operation. The commitment, CY-97-021-1, provided by letter dated March 21,1997N, states [)i)

W T. C. Feigenbaum letter to the U. S. Nuclear Regulatory Commission,

" Corrective Actions for Potential Water Hammer in the Service Water Supply and Return Lines for the Spent Fuel Pool Heat tixchanger,' dated March 21,1997 9704080308 970402

^ " "

S" 88A ( seppupppppp

1 4

i U. S. Nuclear Regulatory Commission CY-97-036/Page 2 that the modification to install a check valve will be completed by April 14,1997.

The check valve and one of the two pieces of pipe iequiring replacement will be i installed by this date. However, the second piece of pipe and any additional piping locations to be replaced will require additional time.  !

We willinform the NRC Senior Resident inspector of the additional time that is needed.

If you should have any questions on the above, please contact Mr. G. P. van  ;

Noordennen at (860)267-3938.

)

Very truly yours,  !

. 1 CONNECTICUT YANKEE ATOMIC POWER COMPANY l i

For: R. A. Mellor

. Director of Site Operations and Decommissioning b '

By: . D. Ha@Ieltihe l

Engineering Director cc: H. J. Miller, Region 1 Administrator M. B. Fairtile, Senior Project Manager, Haddam Neck Plant W. J. Raymond, Senior Resident inspector, Haddam Neck Plant l

j