ML19260C859
| ML19260C859 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 01/30/1980 |
| From: | Utley E CAROLINA POWER & LIGHT CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NO-80-146, NUDOCS 8002060271 | |
| Download: ML19260C859 (2) | |
Text
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January
,0, 1980 FILE: NG-3514(B)
SERIAL NO.: NO-80-146 Office of Nuclear Reactor Regulation ATTENTION:
Mr. T. A. Ippolito, Chief Operating Reactors Branch No. 3 United States Nuclear Regulatory Commission Washington, D.C.
20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 AND 50-324 LICENSE NOS. DPR-71 AND DPR-62 FEEDWATER AND CRD RETURN LINE N0ZZLE INSPECTIONS
Dear Mr. Ippolito:
NUREG-0312, " Interim Technical Report on BWR Feedwater and Control Rod Drive Return Line Nozzle Cracking", requires that we provide a description of our proposed inspection program of the feedwater and CRD return line nozzles prior to refueling outages.
Our planned inspection program for the 1980 refueling outages on Brunswick Steam Electric Plant (BSEP) Unit Nos. 1 and 2 is as follows:
Feedwater Nozzles The accessible areas of the feedwater nozzles in both BSEP units were Penetrant Test (PT) examined during the 1979 refueling outages. No crack-like indications were found. The accessible areas include the part of the nozzle blend radius above and below the spargers. These areas are the most susceptible areas for cracking.
NUREG-0312, Section 6.3, Paragraph 5, states " subsequent PT examination of the nozzles should be performed at the earlier of (a) every other scheduled refueling outage, or (b) at the scheduled refueling outage after 20, but prior to 40 start-up/ shutdown cycles after the last PT examination".
Neither Brunswick Unit No. 1 nor Unit No. 2 has had 10 start-up/
shutdown cycles since the 1979 refueling outages. Since no cracklike indications were found in 1979 and neither unit has had the minimum start-up/ shutdown cycles required for inspections, we do not plan to PT examine the feedwater nozzles on either BSEP unit during the 1980 outages.
1933 174
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s Mr. T. A. Ippolito CRD Return Line Nozzles The CRD return line nozzles on both BSEP units were PT examined during the 1979 refueling outages. The Unit No. 2 nozzle revealed no indications while Unit No.1 did. The indications on Unit No. 1 were removed.
The CRD return lines were valved out, and tests were performed to verify CRD system operation. With the CRD return line valved out on each unit, thermal fatigue, the underlying cause of crack initiation, has been eliminated; therefore, we do not plan to inspect the CRD return line nozzles on either BSEP unit during the 1980 outage.
Should you have any questions, please contact us.
Yours very truly,
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-h E. E. Utley Executive Vice President Powcr Supply & Customer Services SWP/j cb 1933 175