ML18114A235

St. Lucie Unit 1 - Recent Inspections and Evaluations of Worn Guide Tubes by Combustion Engineering

ML18114A235
Person / Time
Site:	Saint Lucie
Issue date:	02/27/1978
From:	Uhrig R E Florida Power & Light Co
To:	Davis D K 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 NRC GRG: UHRIG R E FL PWR 8.LIGHT DOCDATE: 02/27/78 DATE RCVI3: 02/27/78 l3GCTYPE: LETTER NOTARIZED:

NO COPIES RECEIVED

SUBJECT:

LTR, 3 ENCL 0'URNISHING INFO CONCERNING RESULTS GF RECENT INSPEC AND EVALUATION OF REACOTR OPERATION WITH GUIDE TUBE WEAR.PLANT NAI'IE: ST LUCIE 8l REVIEWER INITIAL: X JN l3ISTRIBUTGR IhlITIAL:.

DISTRIBUTION OF THIS NATERIAL IS AS FOLLOWS'GENERAL l3ISTRIBUTIOIU FOR AFTER ISSUANCE OF OPERATING LICENSE.(DISTRIBUTION CODE A00i)FGR ACTION: INTERNAL: EXTERNAL: BR CHIEF REID+>>LTR ONLY(7)I 8e E44LTR ONI.Y(2)HANAUER4->>LTR ONLY (l)EI SENHUT~H!LTR ONLY<i)BAER~H!LTR ONLY(l)GRII'IES++LTR ONLY<i)J.NCGOUGH~H!LTR ONLY (l>LPDR'S FT PIERCE.FL~~LTR ONLY<i)TIC++LTR ONLY(i>NSIC+4LTR ONLY(i,)ACRS CAT B>>+LTR ONLY(ib)NRC PDR++LTR ONLY(l>OELD4<LTR ONLY<i)CHECI 4H!LTR ONLY (l)SHAQ44LTR ONLY<i)BUTLER+~!LTR ONLY(i>'COLL INS++LTR ONLY<i)f DISTRIBUTION:

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0 I CS FLORIDA POWER&LIGHT COMPANY 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:

Re: St.Lucie Unit 1 Docket No.50-335 Reactor Operation With Guide Tube Wear (Re ort CEN-79-P)February 27, 1978 L-78-68/<O~AR g~8~+i@'

oy Xr 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 Vice President 7806500~lREU/MAS/bab cc: Mr.James P.O'Reilly, Region II Harold F.Reis, Esquire PEOPLE...SERVING PEOPLE 4'4~4