Part 21 Report - 1996-340
ACCESSION #: 9603210271
Illinois Power Company
Clinton Power Station
P. O. Box 678
Clinton, IL 61727
Tel 217-935-5623
Fax 217-935-4632
Wilfred Connell
ILLINOIS Vice President
POWER
U-602564
4F.140
WC-091-96
March 13, 1996
Docket No. 50-461 10CFR21.21
Document Control Desk
Nuclear Regulatory Commission
Washington, D.C. 20555
Subject: 10CFR21 Interim Report 21-96-001: Ideal Generators
Installed with Emergency Diesel Generators Have
Generator Rotor Mass Greater Than Originally Calculated
Dear Sir:
On January 15, 1996, Illinois Power (IP) identified a condition
involving the Divisions 1 and 2 Emergency Diesel Generators (EDGs) as
potentially reportable under the provisions of 10CFR21. Specifically,
Condition Report (CR) 1-96-01-029 was initiated to identify that Ideal
Electric, the manufacturer of the generator portion of the EDGs, had
discovered that the mass of the generator rotors had been incorrectly
calculated. The revised calculation shows a larger rotor mass and
rotational inertia.
IP has completed an evaluation of the impact of this condition on
the seismic qualification of the diesel generator units and has concluded
that the increase in mass has no adverse impact on the units. However,
IP has not completed an evaluation of the impact on the frequency and
torsional analysis of the units. IP purchased the EDG units from Stewart
& Stevenson. The generators are Ideal model numbers SA6-50 and SA6-44,
and Ideal drawings B-MED-221 and B-MED-217.
The evaluation for reportability under the provisions of 10CFR21 is
currently scheduled to be completed by July 12, 1996. Following
completion of the evaluation, IP will report the results to the NRC in a
final report. Additional information regarding this issue may be
obtained by contacting M. M. Gandhi, Engineering Projects, at (217) 935-
8881, extension 4082.
Sincerely yours,
Wilfred Connell
Vice President
RSF/csm
U-602564
Page 2
cc: NRC Clinton Licensing Project Manager
NRC Resident Office, V-690
Regional Administrator, Region III, USNRC
Illinois Department of Nuclear Safety
INPO Records Center
Ideal Electric
Steward & Stevenson
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