ML20004B189
| ML20004B189 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 05/20/1981 |
| From: | Utley E CAROLINA POWER & LIGHT CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NO-81-898, NUDOCS 8105270371 | |
| Download: ML20004B189 (2) | |
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Serial No.: NO-81-898 Office of Nuclear Reactor Regulation ATTENTION:
Mr. T. A. Ippolito, Chief Operating Reactors Branch No. 2
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United States Nuclear Regulatory Commission Washington, D. C.
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BRUNSWICK STEAM ELECTRIC PLANT UNIT NO. 1
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IN-CORE VIBRATION SURVEILLANCE h
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Dear Mr. Ippolito:
Summary This is in regard to a Carolina Power & Light Company (CP&L) letter dated July 22, 1976 to Mr. Benard C. Rusche concerning
" Surveillance Program to Ensure Plant Modifications Eliminated In-Core Vibrations" for the Brunswick Steam Electric Plant (BSEP) Unit No. 1.
In this letter, CP&L committed to "the installation of accelerometers on a number of in-core instrument / source tubes, monitoring the accelerometer signal at least monthly, and reporting any anomalotis behavior to the NRC."
As described below, CP&L believes that termina-tion of this commitment is' justified.
Justifications Over four years of operating experience at Brunswick and information available from other plants through General Electric (GE) have determined the following:
1.
Following core plate plugging, inspections were performed at many BWR/4 sites and have, in all cases, indicated little or no LPRM contact or wear on the fuel channels.
2.
Fully instrumented, full scale flow test of all BWR core configurations have been completed at GE.
These test results were consistent with the channel inspection results and also confirmed that there was no significant LPRM vibration or channel contact.
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One BWR/4 plant was monitored before and after core plate plugging. The results of this mouitoring program indi-cated a significant LPRM vibration reduction. A totai of six other BWR/4 plants have been monitored after core plate plugging with consistent low vibration level results.
In summary, CP&L and GE have concluded that the problems of high levels of LPRM vibration and fuel channel wear have been resolved for the BWR/4 (Brunswick) and that further acquisition of confirmatory data is not required.
Conclusion Based on the above information, CP&L is planning to terminate the commitments from our July 22, 1976 letter on July 1, 1981. Please advise us if you do not concur with this plan.
Please contact my staff if you have any questions concerning this information.
Yours very ruly,
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E. E. Utley Executive Vice President Power Supply and Engineering & Construction RMP/JM/je (3909) l l
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