ML20091M200
| ML20091M200 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 01/27/1992 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLS-91-341, NUDOCS 9201280384 | |
| Download: ML20091M200 (2) | |
Text
e C9&L Carolirn Power & Light Company P. O. Bos 1651
- Ra6egh, N C. 27602 SERIAL N LS 341 g g 7 gggp R. A. WATSON Sen.or Vce Pree. dent Nuclear Genersten United States Nuclear Regulatory Commission ATTENTION:
Document Control Desk Washingtor., DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 s DOCKET NOS, 50-325 AND 50-324/ LICENSE NOS DPR-71 AND DPR-62 BRUNSWICK ELECTRICAL DISTRIBUTION SYSTEM INHANCEMENTS Centlemen:
The purpose of this letter is to formally communicate Carolina Power & Light Company's (CP&L) plans to enhance the electrical distribution system at the Brunswick Steam Electric Plant (BSEP).
The planned enhancements were discussed in a meeting with the NRC staff on December 12, 1991.
As discussed in the December 12, 1991 meeting, CP&L plans to make several modifications to the off-site and on-site power distribution system at BSEP.
The major features of the proposed modifications are summarized below:
Off Site Power System Add one 25MVA 230/4.16 kV start-up transformer per unit.
Add new voltage regulators to the 4160 V emergency bus feeds.
Add new DC storage barteries for 230 kV switchyard control power Upgrade the rapacity of the secondary Y-winding, n'a-segregated ous duct of the existing start-up auxillary transformers to 5000 amps.
On-Site Power Svsterg Add a new 4000kW non-class IE diesel generator capable of 'eeding any one of tho four existing E-busses.
Th e s - mom fications to BSEP resolve NRC concerns related to CDC-17, resolve a number of current and potential future limitations of the electrical system, improve the overall reliability of both the off-site and on-site power systems and, consequently, imr ove overall plant safety, As discussed in the meeting, CP&L believes the mag. itude of the safety improvement associated with the addition of the non-class lE diesel generator justifies extending the allowed g
outage time for a class lE emergency diesel generator from 7 days to 30 days
. \\
with one unit shutdown.
The extension of the allowed c tage time would allow for more comprehensive and higher-quality maintenance, 4th a resulting overall improve.aent in reliability and availability cf the emergency diesel l 0 generators.
9201280384 92010.7 PDR ADOCK 05000324 p
- Document Control Desk (NLS-91 341) / Page 2 CP&L_ plans to install the electrical system modificatione during the Unit I refueling autage scheduled for early 1994 and the Unit 2 refuel'ng outabo scheduled for late 1994.
The Company will notify the NRC of any. changes to this planned schedule arising from the identification of higher-priority work.
We believe-it would be mutually beneficial to have a joint rnecting of our technical staffs in'the first quarter of 1992 to review details of the design and identify the scope and content of required submittals to facilitate the NRC review process, Arrangements for the meeting w141 be coordinated through the NRC Project Manager.
CP&L appreciated the opportunity to brief the NRC on-these issues and found the technical and policy discussions useful in finalizing our plans.
Yours very truly, f'pL.( Zh4W Y
R. A. Watson SDF/jbw (1442BNP.SDF)
. cc:
Mr.
S..D, Ebneter Mr N, B. Le Mr R. L. Prevatte-I i
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