ML20046C382

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Forwards Analysis of Cracking Indications Found in Unit 1 Core Spray Sparger Piping,In Response to NRC Bulletin 80-13. Concludes That Unit 1 Core Spray Piping Acceptable in as- Found Condition for Next Operating Cycle
ML20046C382
Person / Time
Site: Brunswick Duke Energy icon.png
Issue date: 07/26/1993
From: Hinnant C
CAROLINA POWER & LIGHT CO.
To: Ebneter S
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20046C383 List:
References
BSEP-93-0119, BSEP-93-119, IEB-80-13, NUDOCS 9308100227
Download: ML20046C382 (3)


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-1 Serial: BSEP 93-0119 Mr. Stewart D. Ebneter Regional Administrator  ;

United States Nuclear Regulatory Commission 101 Marietta Street, N. W., Suite 2900 Atlanta, GA 30323 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS.1 AND 2 DOCKET NOS. 50-325 & 50-324 / LICENSE NOS. DPR-71 & DPR-62 IE BULLETIN 80-13: CRACKING IN CORE SPRAY SPARGERS

Dear Mr. Ebneter:

The purpose of this letter is to provide the NRC with an analysis of the crack indications '

found in Carolina Power & Light Company's Brunswick Unit 1 core spray sparger piping.

The initial crack indications in the Brunswick Unit 1 core spray sparger piping were ,

identified and reported to the NRC Regional Office in a telephone conference call on i June 25,1993. ]

Two linear indications were identified in the Brunswick Unit 1 in-vessel core spray piping  ;

(B-loop), during visual examinations using a remotely operated underwater camera. One indication, approximately 4" long, is in the heat affected zone of a circumferential weld located in the in-vessel piping between the B-loop intet nozzle and the sparger. This weld is located approximately 18" downstream of the B-loop tee box. The other indication, approximately 3" long, is on a tee-to-sparger arm circumferential weld on one of the lower i B-loop spargers.

Enclosure 1 provides the analysis for Brunswick Unit 1 core spray sparger piping crack .

indications. l The conclusion of the enclosed analysis is that the Brunswick Unit 1 core spray piping is -

acceptable in the as-found condition for the next operating cycle. The predicted crack l length at the end of an eighteen month operating cycle will not reduce the structural and hydraulic design rnargins for the piping and sparger below allowable values; therefore, the condition of the internal core spray piping does not impose any restrictions to plant operation for the next operating cycle (Cycle 9).

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Mr. S. D. Ebneter l' BSEP 93-0119 / Page 2 The core spray piping is routinely examined every refueling outage. The piping will be re-  !

evaluated and/or repaired in Brunswick Unit 1 Refuel Outage No. 9 (Cycle 10) based upon  ;

the results of the examination performed during that outage. .

Please refer any questions regarding this submittal to Mr. K. A. Harris at (919) 457-3312.  !

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l Yours very truly, y M4g C. S. Hinnant, Director Site Operations j Brunswick Nuclear Plant  ;

SHC/shc (bnp93119.000)

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cc: NRC Document Control Desk Mr. P. D. Milano Mr. R. L. Prevatte I

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Mr. S. D. Ebneter - ,

BSEP 93-0119 / Page 3 i s

bec: T. A. Baxter, Esq. Mr. G. D. Hicks f Mr. M. D. Bradley Mr. W. G. Hindman  ;

Mr. J. M. Brown - Mr. C. S. Hinnant l Mr. R. K. Buckles (LIS) Mr. W. Levis  !

Mr. S. H. Callis Mr. E. M. Northeim  ;

Mr. M. S. Calvert Mr. W. S. Orser  !

Ms. A. C. Dixon Mr. H. A. Pollock-Mr. R. C. Godley Mr. W. W. Simpson ,

Mr. H. W. Habermeyer, Jr. Mr. R. S. Stancil l Mr. R. Hanford Mr. C. C. Warren l Mr. E. M. Harris Mr. G. H. Warriner l Mr. K. A. Harris Mr. R. A. Watson t Mr, J. D. Heidt File: BC/A-4 i File: B-X-  !

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