ML17339A889

Forwards Mar 1980 Steam Generator Repair Rept, Revision 7. Major Changes Cover Lower Assembly Removal,Dose Calculations,Steam Generator Disposal & Return to Svc Testing.Affidavit Encl

ML17339A889
Person / Time
Site:	Turkey Point
Issue date:	03/28/1980
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
Shared Package
ML17339A888	List: ML17339A887 ML17339A889
References
L-80-108, NUDOCS 8004110533
Download: ML17339A889 (6)

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FLORIDA POWER I LIGHT COMPANY March 28. 1980 L-80-108 Office of'uclear Reactor Regulation Attention: Mr. Darrell G. Eisenhut Acting Director Division of Operating Reactors U. S. Nuclear Regulatory Coomission

.Washington, D. C. 20555

Dear Mr. Eisenhut:

Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 Steam Generator Re air Re ort Attached'herewith is Revision 7 to Florida Power. 8 Light Company's Steam Generator Repair Report (SGRR) which was forwarded to you on September 20, 1977 (L-77-296).

The major changes included in Revision 7 are summarized below.

(1) Lower Assembl Removal The SGRR, through Revision 6, has described the repair as involving removal of the upper assembly by cutting the steam generator in the transition cone area and removing the lower assembly by cutting the reactor coolant piping. This method is referred to as the pipe cut approach. However, due to recent Surry experience, we have re-evaluated the methodology and man-rem exposures associated with the pipe cut approach and have determined that an alternate approach would be more desirable. This revision revises the SGRR to reflect this new approach. It consists of removing the upper assembly, as before, by cutting in the transition cone area. Removal of the lower:assembly would be accomplished by cutting the lower assembly near the junction of the steam generator channel head to the tubesheet. This alternative is referred to as the channel cut approach. This approach is expected to result in a significant savings of man-rem over the pipe cut approach.

(2) Dose Calculations As part of our re-evaluations, in addition to revising man-rem dose estimates, we have also .revised off-site 80pcy yog~5 PEOPLE... SERVING PEOPLE

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Office of Nuclear Reactor Regulation Page Two dose calculations to reflect the non-uniform deposition=

of corrosion products on the various internal surfaces of the steam generators. Previous release calculations has assumed uniform deposition. The relative concen-tration factors used in these revised calculations are shown in Table 6.2.-1.

We have also updated the SGRR to reflect actual 1978-1979 releases and exposure data. This data is used throughout the report for comparison purposes with the releases and exposures expected from the repair.

Previously, 1976 data had been used.

(3) Steam Generator Dis osal As part of our on-going evaluations, we have now determined that disposing of the old steam generators by shipping them by barge to a land burial site may now be a viable alternative. Barge shipment had previously not been considered viable because of the lack of barge-slip facilities at the Barnwell,, S. C.

disposal site. We now feel that the appropriate facilities can be made available at Barnwell. Chapters 3 and 8 have been revised to reflect this..

(4) Return To Service Testin Chapter 4 of the SGRR has been revised to include additional details on the return to service testing which will be done to verify the integrity of the reactor coolant system and the containment building.

This information is in response to the Atomic Safety and Licensing Board order dated October ll, 1979.

Very truly yours, Robert E. Uhrig Vice President Advanced Systems 8 Technology REU/GOM/ah Attachment cc: J. P. O'Reilly, Region II Harold F. Reis, Esquire

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STATE OF FLORIDA )

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Robert'E- Uhrig,.being first duly sworn, deposes and says:

That he is a Vice President of Florida Power & Light Company, the Licensee herein; That he has executed the foregoing document," that the state-ments made in this said document are true"and correct to the best of his knowledge, info mation, and belief, and that he is authorized to execute the document on behalf of said Licensee.

Robert E.'hrig

'ubscribed and sworn to before me this say oz Yff~~ 19gb

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NOTARY PUBLIC, in and for the county of Dade, State of Florida

/ S OF F O O* et LAFiG NOTAFiY PUSUO S MY COMMISSiOM EXFiSSS AU%ST 24.

l lAYlNLO QO'iOi'.Pg hGQw Y Ny commission expires: SOllOKQ 1llliU

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