ML20082U480

Provides Summary of Intended in-vessel Core Spray Piping Repair Technique

ML20082U480
Person / Time
Site:	Brunswick
Issue date:	09/13/1991
From:	Floyd S CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NLS-91-223, NUDOCS 9109200188
Download: ML20082U480 (3)

Text

/ 8 l Carolins Power & Light Cornpany SEP 13 M SERIAL: NLS 91223 Uahed States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 BRUNSWICK STEAM El.ECTRIC PLANT, Uf. r NO. 2 DOCKET NO. 50 324/ LICENSE NO. OPR 62 IN VESSEL CORE SPRAY PIPING REPAIR d Gentlemon:

On February 23,1990 (Serial: NLS-90-048), Carolina Power & Lloht Company submitted the results of core spray system piping and spargers inspections for the Brunswick Steam Electric Plant, Unit No. 2. Those inspections woro performed in accordance with NRC Bulletin 8013 dated May 12,1980. Subsequently, by lot;s dated October 30,1990 (Scrial: NLS 90-224), Carolina Power & Light Company responded to an NRC request for additionalinformation concerning a crack found in the in vessel coro spray piping of the Brunswick Plant, Un't 2. The October 30, 1990 letter Indicated the Company's plant, were to repair the pipo crack during the Fall 1991 Unit 2 refuelin0 outage (i.e., the Roload 9 outa00 beginninD -

September 12, 1991). The purpose of this letter is to provido a summary of the intended repair technique, in accordance with the provisions of 10 CFR 50.59, the Company intends to reinforce the piping usin0 brackets similar to the Peach Bottom Unit 3 repair that was performed in 1985 (soo the attached sketch). Those brackets are bein0 designed to maintain full structuralintegrity of the In vessel core spray pipinD '

regardless of the longth of the crack. The only significant difference from the Peach Bottom Unit 3 installation is that the brackets will be installed at the Brunswick Plant, Unit 2 using underwater welding techniques. The use of underwater welding will result in lower personnel radiation exposures. The bracket wolds will be added to the augmented in service inspection of the in vossel coro spray piping and inspected accordin0l y, if any cracks were to develop in the bracket wolds, those cracks will be documented in accordance with Bulletin 8013.

The too box to pipe circumferential wolds will continue to bo visually inspected ,

each outa00.

The brackets will maintain full structuralintegrity of the pipin0; thereforo, CP&L believes that coiith b d liquid penetrant inspection and the reporting of additional crack Growth in this sold following each refueling outage is no lon0er nooded. g ,

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Document Control Desk NLS 91223 / Page 2 AdditionalInformation will be provided to the NRC following completion of the project to document the repair and to justify discontinuing the liquid penetrant inspuction and reporting referenced above for the remainder of the operating illo for Brur.swick Plant, Unit 2.

Please refer any questions regarding this submittal to Mr. W. R. Murray at (919) 546 4661, Yours very truly, S. D. Floyd' Mano00f Nuclear Licensing Section WRM/wrm (csrepair.wpf)  ;

Enclosuro cc: Mr. S. D. Ebneter Mr.N.B.Le Mr. R. L. Provatto e

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