ML15223A809
| ML15223A809 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/08/1982 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8206180041 | |
| Download: ML15223A809 (3) | |
Text
DISTRIBUTION:
ocfFile DEisenhut HOrnstein NRD '-
Rlngram EBLackwood L PDR PWagner OELD ORB#4 Rdg Gray File AEOD Dockets Nos. 50-269, 50-270 IE and 50-287 ACRS-10 Mr. William 0. Parker, Jr.
co Vice President - Steam Production Duke Power Company P. 0. Box 33189
\\
422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Parker:
In an attempt to complete our review of the "Adequacy o tatoi ectrcal Distribution Votages! for the Oconee Nuclear Station we abd. Iconsultant (EG&G Idaho, Inc.) have reviewed the information you have provi and held telephone conferences with members of your staff.
We had indicated to your staff that we had almost completed our analyses to resolve this issue. How ever, in.the final evaluation we have decided that we have insufficient information to resolve all of our concerns. Therefore, we ask that you pro vide the information requested in.the enclosure to this letter.
Since we would like to resolve this issue in the near future, we would appreciate your response within 60 days of your receipt of this letter.
This request relates solely to the Oconee Nuclear Stationand, therefore, fewer than ten respondents are affected and OMB clearance is not required under P. L.96-511.
Sincerely, John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing
Enclosure:
Request for Additional Information cc w/enclosure:
See next page 8206180041 920608 PDR ADOCK 05000269 P
PDR ORB#4:DL C-ORB#4:DLj_
O FFA IIC E 6/ /826/
DATE NRC FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981-335-960
Duke Power Company cc w/enclosure(s):
Mr. William L. Porter Duke Power Company P. 0. Box 33189 422 South Church Street Office of Intergovernmental Relations Charlotte, North Carolina 28242 116 West Jones Street Ralei gh,.North Carolina 27603 Oconee County Library 501 West Southbroad Street Walhalla, South Carolina 29691 Honorable James M. Phinney County Supervisor of Oconee County Walhalla, South Carolina 29621 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission, Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Regional Radiation Representative EPA Region IV 345 Courtland Street, N.E.
Atlanta, Georgia 30308 William T. Orders Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 J. Michael McGarry, III, Esq.
DeBevoise & Liberman 1200 17th Street, N.W.
Washington, D. C. 20036
A w
w Enclosure ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES OCONEE NUCLEAR STATION
Reference:
NRC letter, W. Gammill to All Power Reactor Licensees, "Adequacy of Station Electric Distribution Systems Voltages", August 8, 1979.
- 1. Is it possible to automatically connect a Lee Station turbine to the Class 1E distribution system at the Oconee Station (consider the possibility of the standby buses being energized by the Lee Station turbine)? Is it then con sidered an onsite or an offsite source? If offsite, then provide analysis cases for maximum and minimum steady-state voltages and minimum transient voltages for all voltage levels of the Class 1E distribution system.
- 2. The Oconee Final Safety Analysis Report indicates that each unit has a second delayed source of offsite power. This is with the generator links removed, and backfeeding the main transformer from the 230 kV grid (525 kV grid for Unit 3),
through the unit auxiliary transformer to the main feeder bus to the Class 1E buses.
Per the requirements of Reference 1, this source of offsite power must also be analyzed.
Provide the analyzed voltages for all voltage levels in the Class 1E distribution system for maximum and minimum steady-state voltage and minimum transient voltage, utilizing both the 230 and the 525 kV grids.
- 3. Describe the loss-of-voltage and degraded voltage relaying, including location of relays, coincidence logic and search scheme. Provide a-graph that shows two plots (relay characteristics (including tolerances) and the worst case analyzed voltage transient). This should show that there is no possibility of spuriously tripping the offsite source due to minimum analyzed conditions.
- 4. It appears that there may be sections of your Technical Specifications (i.e.,
3.7.2) that will need to be changed besides Section 3.7.1 to permit only one unit's load on a given startup transformer. Provide Technical Specifications that will accomplish this.
- 5. Discussion with your staff indicated that a spare startup transformer might be installed. What is the current status of this proposal?