ML17054A274
| ML17054A274 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 11/21/1983 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Rhode G NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 8312140373 | |
| Download: ML17054A274 (6) | |
Text
RIBUTION:
,/'ocument Cont(ol..3 NRC PDR L PDR NSIC PRC LB82 File EHylton MHaughey Region I
- ELJordan, DEQA:IE JMTaylor, DRP:IE Bordenick, OELD ACRS (16)
- Nine Mile Point Unst 2
November 21, 1983 Docket No.:
50-410,>>'r.
Gerald K. Rhode Senior Vice President Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202
Dear Mr. Rhode:
Subject:
Request for Additional Information During its license
- reviews, the NRC staff has recently become aware of some non Class 1E distribution system designs utilizing electrical interconnections (bu s,ties, automatic bus transfers and manual bus transfers) between Class lE switch gear.
The configurations used do not conform to regulatory guidance covering redundant Class 1E bus interconnections.
The impact of these interconnections on the independence of redundant 1E buses has not been identified.
As a result, the NRC staff is conducting an indepth review of these types of interconnections on plants currently under review.
The enclosed request for additional information concerns such circuits found in the Nine Mile Point Unit 2 electrical system design.
Please provide a schedule for response to this request for additional information within 14 days of receipt of this letter.
If you have any questions concerning the above information or the enclosed request f'r additional information, please call the Licensing Project Manager, Mary F. Haughey, at (301) 492-7897.
Sincerely,
Enclosure:
As stated a
@1~1 gg~
A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing DL: B82/BC ASchwencer ll/P /83 cc w/ enclosure:
See next page MFHaughey:pt 11/g/83 8312140373 831121 PDR ADOCK 05000410 A
Ip l
h t 8
Nine Mile Point 2 Mr. Gerald K. Rhode Senior Yice President Niagar a Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202-CC.
Mr. Troy B. Conner, Jr.,
Esq.
Conner
& Wetterhahn Suite 1050 1747 Pennsylvania
- Avenue, N.W.
Washington, D. C.
20006 Mr. Richard Goldsmith Syracuse University College of Law E. I. White Hall Campus
- Syracuse, New York 13210 Mr. Jay Dunkleberger, Director Technological Development Programs New York State Energy Office Agency Building 2 Empire State Pl aza..-.-
- Albany, New York 12223 Ezra I'. Bialik Assi stant Attorney General'nvironmental Protection Bureau New York State Department of Law 2 World Trade Center New York, New York 10047 Resident Inspector Nine Mile Point Nuclear Power Station P. 0. Box 99
- Lycoming, New York 13093 Mr. John W. Keib, Esq.
Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 Jay M. Gutierr ez, Esq..
.U. S. Nuclear Regulatory -Comaission Region I,
631 Park Avenue King of Prussia, Pennsylvania 19406
NINE NILE POINT UNIT 2 REl}UEST FOR ADDITIONAL INFORMATION 430.118 (SRP 8.3.1) p
~
FSAR Figures 8.3-3 and 8.3-11 shows a
120 VAC automatic and several 125 VDC manual load transfers'etween non Class:lE power supplies which are in turn fed from redundant 4160 VAC Class 1E buses during operation on the diesel generators.l The confi'guration of the circuits is such that a single failure of the transfer device, open fuse holder, or fault between adjacent power panel buses co'uld potential.ly affect the redundant Cl'ass 1E buses.
In Tight of the fact SRP Section 8.3.1.III.2.b and R.G, 1
- 6. does not allow these-configurations for connection 'of CXass: TE loads to redundant CTm'z
$ E supplies, justify the; accepta4i'4'f this
~figuration for non Dass lE lamh-which: are not vital to glazt'afety The interconnectionz fn'mesc.ion 'are shotÃt fn Figure. 8.3-3 between the UPS "8 supply and "A" supply, and'hose shown in Figure 8.3-11 between switdsyar 2 BYS-SMG001A and 0018 ta the three control bus power panels.
Also identify all other non Class 1E transfers or interconnections which are connected.
ter redundant Class 1E power supplies.