U-602564, Interim Part 21 Rept 21-96-001 Re Egds Rotor Mass Greater than Originally Calculated.Revised Calculation Shows Larger Rotor Mass & Rotational Inertia

Interim Part 21 Rept 21-96-001 Re Egds Rotor Mass Greater than Originally Calculated.Revised Calculation Shows Larger Rotor Mass & Rotational Inertia

ML20101D823
Person / Time
Site:	Clinton
Issue date:	03/13/1996
From:	Connell W ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-96 21-96-001, 21-96-1, U-602564, WC-091-96, WC-91-96, NUDOCS 9603210271
Download: ML20101D823 (2)

Text

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Ilhnois Power Company 0 Clinton Power Station v P o, Box 678 Chnton. IL 61727 Tel 217 935 5623 4 Fax 217 935-4632 Wilfre:i Connell Vice President ILLIN#IS u-60u64 P@ M R- 4v.i40 i WC-091-96 March 13, 1996 ,

Docket No. 50-461 10CFR21.21 Document ControlDesk Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

10CFR21 Interim Report 21-96-001: Ideal Generatorr Installed with Emergency Diesel Generators Have Generator Rotor Mass Greater Than Oriainally 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 I 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 af%e evaluation, IP will report the results to the NRC in a final report. Additional infornu regarding this issue may be obtained by contacting M. M. Gandhi, Engineering Projds, at (217) 935-8881, extension 4082.

Sincerely yours,

/l//E f&nW Wilfred Connell '

Vice President RSF/csm 9603210271 960313 PDR ADOCK 05000461 '

S PDR .

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U-602564 h a Page 2 cc: NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Regional Administrator, Region III, USNRC 111inois Department of Nuclear Safety INPO Records Center IdealElectric

Steward & Stevenson i

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