ML18114A235

Recent Inspections and Evaluations of Worn Guide Tubes by Combustion Engineering

ML18114A235
Person / Time
Site:	Saint Lucie
Issue date:	02/27/1978
From:	Robert E. Uhrig Florida Power & Light Co
To:	Desiree Davis Office of Nuclear Reactor Regulation
References
Download: ML18114A235 (4)

Text

REGULATORY INFORNATION DISTRIBUTION SYSTEN (RIDS >

DISTRIBUTIQN FOR INCONING I'IATERIAL 50-335 REC: DAVIS D K GRG: UHRIG R E DOCDATE: 02/27/78 NRC FL PWR 8. LIGHT DATE RCVI3: 02/27/78 l3GCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR, 3 ENCL INFO CONCERNING RESULTS GF RECENT INSPEC AND EVALUATION 0'URNISHING OF REACOTR OPERATION WITH GUIDE TUBE WEAR.

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CS FLORIDA POWER & LIGHT COMPANY February 27, 1978 L-78-68 Office of Nuclear Reactor Regulation Attention: Mr. Don K. Davis, Acting Chief /

Operating, Reactors Branch g2 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.. C. 20555

Dear Mr. Davis:

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oy Xr Re: St. Lucie Unit 1 Docket No. 50-335 Reactor Operation With Guide Tube Wear (Re ort CEN-79-P) The results of recent inspections and evaluations of worn guide tubes by Combustion Engineering indicate that more severe wear than reported in the referenced report has been observed in a very limited number of fuel bundles. As reported in a meeting between Baltimore Gas 6 Electric Company and the NRC staff on February 21, 1978, preliminary results of the Combus-tion Engineering analyses of the more severely worn assemblies identified to date indicate that the stress criteria established in CEN-79-P may be exceeded in some guide tubes during the limiting seismic excitation (SSE). The results of the Combus-tion Engineering test, program to date, however, demonstrate that limiting wear configurations will still allow the CEAs to insert following an SSE. We believe that these test re-sults continue to support the conclusion that guide tube wear will not prevent CEAs from inserting following an SSE. Combustion Engineering has informed us that they are contin-uing their evaluation of the inspection results and we will inform the NRC staff when final analytical and test results are available. It should be emphasized that the results referred to in this letter are preliminary and are provided to ensure that the NRC staff is informed of the most current results. Very truly yours, Robert E. Uhrig 7806500~l Vice President REU/MAS/bab cc: Mr. James P. O'Reilly, Region II Harold F. Reis, Esquire PEOPLE... SERVING PEOPLE 4'4 ~4