Part 21 Report - 1998-072
ACCESSION #: 9801020165
Illinois Power Company
Clinton Power Station
P.O. Box 678
Clinton, IL 61727
Tel 217 935-5623
Fax 217 935-4632
ILLINOIS
POWER John G. Cook
Senior Vice President
An Illinova Company U-602997
4F.140
December 22, 1997
Docket No. 50-461 10CFR21.21
Document Control Desk
Nuclear Regulatory Commission
Washington, D. C. 20555
Subject: 10CFR21 interim Report 21-97-051: Improper Cable Resistance
Values Used in Design of the AC and DC Electrical Distribution
System
Dear Madam or Sir:
On October 23,1997, Illinois Power (IP) identified that at least
five electrical voltage calculations for the design for the Alternating
Current (AC) and Direct Current (DC) electrical distribution system used
improper cable resistance data provided by Sargent & Lundy (S&L) in Table
B of S&L Standard ESA-102, "Electrical Engineering Standard for
Electrical and Physical Characteristics of Class B Electrical Cables."
The standard provided the cable resistance used for determining cable
tray loading and voltage drop calculations that established the design
bases of Clinton Power Station (CPS). Per S&L Power and Control Cable
Specification STD-EA-253, "General Specification for Power and Control
Cable Insulated with Ethylene-Propylene Rubber," CPS cables with voltage
ratings below 5 Kilovolts (KV) have "tin-coated" copper conductors;
however, Table B of Standard ESA-102 provides resistance data for 4C
uncoated" copper conductor cables. Coated cables have higher resistance
values than uncoated cables. Higher resistance values yield slightly
lower equipment terminal voltages than presently established in at least
five calculations. Condition Report 1-97-10-414 was initiated to track
the investigation and resolution of this issue.
IP determined this issue was potentially reportable under the
provisions of 10CFR21 on October 25,1997. CPS engineering personnel
identified that the values in S&L standard ESA-102 are lower than actual
cable impedance shown on the cable vendor test reports and cable
manufacturer literature for cable purchased for CPS.
U-602897
Page 2
IP's evaluation of this issue under the provisions of 10CFR21 has
not been completed. IP does not have a firm date for resolving this
issue, but will provide, as a minimum, an update on the resolution
progress by January 19, 1998.
Additional information about this issue may be obtained by
contacting A. B Haumann, Engineering Projects, at (217) 935-8881,
extension 4078.
Sincerely yours,
J. G. Cook
Senior Vice President
RSF/krk
cc: NRC Clinton Licensing Project Manager
NRC Resident Office, V-690
Regional Administrator, Region III, USNRC
Branch Chief, Region III, USNRC
Illinois Department of Nuclear Safety
INPO Records Center
Sargent & Lundy
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