ML17250A809
| ML17250A809 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/04/1980 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8012160429 | |
| Download: ML17250A809 (8) | |
Text
T
, REGULAT Y INFORNATIQM DISTRIBUTIQ'STEN (RIDS)
,gCCESSIOM MBR: 8012160429 DOC. DATE: 80/12/04 NOTARIZED:
NO FACIL: 50-244 Robert Emmet Ginna'uclear Planti Unit 1~
Rochester G
AUTH. MANE AUTHOR AFFILlATION YIAIERiJ. E.
Rochester Gas
~ Electric Corp.
REC IP. MAYiE RECIPIENT AFFILIATION CRUTECHFIELDi D.
Operating Reactors Branch 5
SUBJECT:
Forwards info re util rept on adequacy at station electric distribution sos voltages.
In{'-o provided to assure reviewers of rept that analyses are consistant'/NRC guidelines for vol tag e drop calculations.
DISTRIBUTION CODE.'A015S COPIES RECEIVED: LTR l
ENCL 0 SIZE:
TITLE: Onsite Emergency Poeer Systems DOCKET 0 05000244 NOTES: 1 copy:SEP Sect.
Ldr.
05000244 INTERNAL: AEOD I5C SYS BR t'iPA GELD 09 18 17 BR 12 REG FILE 01 REC IP IENT ID CODE/MANE ACTION:
CRUTCHFIELD 04 COP IES LTTR ENCL 1
1 1
1 1
REC IP IENT ID CODE/NAt'lE GEN ISSUES BR 13 14E Oh NRC PDR 02 QP EX EVAL BR11 POWER SYS BR 14 COPIES LTTR ENCL 2
1 1
EXTERNAL; ACRS MSIC LPDR DE'g g 8 )g80 TOTAL NURSER OF COPIES REQUIRED:
LTTR Q
ENCL
' I'4 )
P 4
V ha,l 0
v h
I ii ff I I l a',
4 4
4 Vh 4 g
r'l 100K N.Y. 14649
"-~"
t
///////I/////
Z//ZS/
E OCHES7kR GAS QD ELECTRIC CORPORATION o
89 EAST A'I/ENUE, ROCHESTER,
)~JOHN E. @IER SQf'Pg E PRES I D EN T cc.W~
l~~
~N~~
CD g~
December 4,
1980 (W
E" Direct:.or of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch 45 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555 TCLEPHONC ARci cooe 7ia 546-2700 so-~eV
Subject:
Rochester Gas and Electric's Report, Adequacy of Station Electric Distribution Systems Voltages, dated December 6,
1979.
References:
1.
Letter dated, August 8,
- 1979, from William Gammill to all power reactors.
2.
Enclosure 2, Guidelines for Voltage Drop Calcula-tions, of reference 1.
Dear Mr. Crutchfield:
In accordance with discussions held on October 14, 1980 with your consultants at. Lawrence Livermore National Laboratories who are responsible for reviewing the subject report, the following information should be forwarded to your reviewers:
Section 6 of reference 2 reguires, in part, that voltages should be calculated for each safety load at, the terminals of each load (i.e. motors).
However, the data supplied by RG&E in the subject report included bus voltages on all safeguards buses for all required operating modes and it appears that no allowance was made for voltage drops that occur on the feeder cables.
The purpose of this letter is to assure the reviewers that RG&E's analyses are consistent with the NRC's Guidelines.
Initially, all feeder cable data was included in a load flow program.
However, the cable size and lengths were such that. the voltage drops in the feeder cables were less than
.01 p.u. volts (RCP feeder starting
=.00094 p.u., S.I. feeder starting
=.0085 p.u.),.
This is less than the minimum necessary for convergence to distinct voltages for the bus and motor terminal loads and the program would not terminate.
The program was run again assuming the bus and motor terminal to be a common node.
Therefore, all bus voltages can be assumed to be very close to the motor terminal voltages.
This condition was later confirmed by field measurements.
I hope that this clarification resolves the comments made by Mr. James Selan of Lawrence Livermore.
O/9 J.
E. Maier
/to
Ia'
REGULA Y INFORYiATIOtd DISTR IBUTIGi SYSTEM (R IDS >
ACCESSION tsBR:
FAC IL: 50-244 AUTH. NAMiE MAlERi V. E.
REC IP. NAfiiE
- CRUTECH IELDi 801216042 P
DOC. DATE: 80/12/04 NOTARIZED:
NO Robert Emmet Ginna Nuclear Planti Unit ii Rochester G
AUTHOR AFFILIATIGtd Rochester Gas 4 Electric Corp.
RECIPIENT AFFILIATION D.
Operating Reactors Branch 5
DOCKET 0 05000244 SUBSECT:
Forwards info re util rept on adequacy at station electric distribution sos voltages. Info provided to assure reviewers oT-rep t that analyses are consi stant w/NRC guidelines for voltage drop calculations.
DISTRI: JTIGN CQD:
A015S COPIES RECEIVED: LTR Et<CL +
SIZE:
TITLE: Ons ite Emer g enc g Po~er Sg s tems NOTES:
1 copy:SEP Sect.
Ldr.
05000244 REC IP IENT ID CODE/NAf'>E ACTION CRUTCHF IELD 04 INTERf!AL: AEOD ISC SYS BR 09 t'iP A 18 GELD 17 OR ASSESS BR 12 REG FILE 01 COPIES LTTR ENCL REC IP IENT I D CODE/tiAf'iE GEN ISSUES BR13 I FAE 06 tlRC P DR 02 OP EX EVAL BR 1 1 POWER SYS BR 14 COPIES LTTR ENCL 2
1 1
EXTERf'NL:
1 LPDR 03 9e TOTAL NVYiCER OF COP LES REQUIRED:
LTTR Q
ENCL
December 4,
1980 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch 05 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Rochester Gas and Electric's Report, Adequacy of Station Electric Distribution Systems
- Voltages, dated December 6,
1979.
References:
1.
Letter dated, August 8,
- 1979, from William Gammill to all power reactors.
2.
Enclosure 2, Guidelines for Voltage Drop Calcula-
-tions, of reference 1.
Dear Mr. Crutchfield:
In accordance with discussions held on October 14, 1980 with your consultants at Lawrence Livermore National Laboratories who are responsible for reviewing the subject report, the following information should be forwarded to your reviewers:
Section 6 of reference 2 requires, in part, that voltages should be calculated for each safety load at the terminals of each load (i.e. motors).
However, the data supplied by RG&E in the subject report included bus voltages on all safeguards buses for all required operating-modes and it appears that no allowance was made for voltage drops that occur on the feeder cables.
The purpose of this letter is to assure the reviewers that RG&E's analyses are consistent with the NRC's Guidelines.
Initially, all feeder cable= data was included in a load flow program.
However,'he cable size and lengths were such that the voltage drops in the feeder cables were less than
.01 p.u. volts (RCP feeder starting
=.00094 p.u., S.I. feeder starting
=.0085 p.u.).
This is less than the minimum necessary for convergence to distinct voltages foi the bus and motor terminal loads and the program would not terminate.
The program was run again assuming the bus and motor terminal to be a common node.
Therefore, all bus voltages can be assumed to be very close to the motor terminal voltages.
This condition was later confirmed by field measurements.
I hope that this clarification resolves the comments made by Mr. James Selan of Lawrence Livermore.
5 J.
E. Maier
REGULA Y INFORYIATION D ISTR IBUTIOI SYSTEN
( R IDS )
ACCESSION NBR: 801216042'P DQC. DATE: 80/12/04 NOTARI ZED:
NQ DOCKET O
FACIL: 50-244 Robert Emmet Ginna Nuclear Planti Unit i~ Rochester G
05000244 AUTH. NAl'IE AUTHOR AFFILIATION YIAIERiJ. E.
Rochester Gas
~ Electric Corp.
REC IP. N4YIE REC IP IEN 7 AFFILIATION CRUTECHFIELDi D. 'perating Reactors Branch 5
SUBSECT:
Forwards info re util rept on adequacy at station electric distribution sos voltages. Info provided to assure reviewers of rept that analyses are consistant w/NRC guidelines for vo 1 tag e drop ca l c ula t ions.
DISTRIBUTION CQD::
A015S COPIES RECEIVED: LTR 1
ENCL Q SIZE:
TITLE: On-ite Emergency Power Systems NOTES." 1 c op g: SEP Sec t. Ldr.
05000244 REC IP IENT I D CODE/NAf'IE ACTION CRVTCHFIELD 04 INTERNAL:
AEOD Ir~C SYS BR 09 f1P A 18 GELD 17 OR ASSESS BR 12 REG FILE, 01 COPIES LTTR ENCL REC IP IENT ID CODE/NAt'IE GEN ISSU-S BR 13 I ~~:E 06 NRC PDR 02 OP EX EVAL BR11 POWER SYS BR 14 CQP IES LTTR ENCL 1
2 1
1 EXTERNAL:
ACRS WSIC 16 05 16 1
LPDR 03 gg TOTAL NUMBER QF CCIPEES REGUIREII:
LTTR Q
ENCL