GO2-83-924, Final Deficiency Rept 290 Re Diesel Generator Exciter Control Cabinet Overheating.Design Change Sped S218-M-C247 Issued to Provide Addl Ventilation for Div 1 & 2 Diesel Generator Excitation Control Cabinets

Final Deficiency Rept 290 Re Diesel Generator Exciter Control Cabinet Overheating.Design Change Sped S218-M-C247 Issued to Provide Addl Ventilation for Div 1 & 2 Diesel Generator Excitation Control Cabinets

ML20078M348
Person / Time
Site:	Columbia
Issue date:	10/14/1983
From:	Carlisle C WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, 290, GO2-83-924, NUDOCS 8310250144
Download: ML20078M348 (2)

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Washington Public Power Supply System.3 P.O. Box 968 3000 GeorgeWashington Way Richland Washington 99352"$09)37,2-5000 Docket No. 50-397

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October 14, 1983 G02-83-924 Mr. J. B. Martin Regional Administrator U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596

Subject:

NUCLEAR PROJECT NO. 2 10CFR50.55(e) REPORTABLE CONDITION #290 DG EXCITER CONTROL CABINET OVERHEATING In accordance with the provisions of 10CFR50.55(e), your office was informeo by telephone of the above subject condition. The attachment provides a final response on Condition #290.

If there are any questions concerning this matter, please contact Roger Johnson, WNP-2 Project QA Manager, (509) 377-2501, extension 2712.

$.Ww C. S. Carlisle Program Director, WNP-2 RTJ/kd

Attachment:

As stated cc: W.S. Chin, BPA N.D. Lewis, EFSEC A. Toth, NRC Resident Inspector Document Control Desk 8310250144 031014 pt,a ADOCK 05000 S

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'. WASHINGTON PUBLIC POWER SUPPLY SYSTEM NUCLEAR PROJECT N0. 2 DOCKET N0. 50-397 LICENSE N0. CPPR-93 10CFR50.55(e) CONDITION #290 DG EXCITER CONTROL CABINET OVERHEATING FIHAL REPORT Description of Deficiency During testing it was found that the Division 1 and Division 2 Diesel Generator Excitation Control Systems would malfunction due to an exces-sive temperature rise in the cabinet in which the Excitation System and its controls are mounted. The temperature in the Excitation Control System Cabinet was found to reach a temperature above the 40 C maximum ambient specified for Diesel Generator Control equipment.

Safety Implication The excessive temperature rise in the DG Excitation Control System Cabi-net can result in malfunction and/or failure of the DG Excitation System which in turn can result in loss of the required on-site power sources for Engineered Safety Features (ESF) loads. Such a failure represents an adverse effect on the safety of the plant even though it is hi.ghly probable that the required redundant off-site power sources would be available to supply power to the ESF loads should the on-site power source failure occur at the time the ESF functions are required. This is considered to be a reportable deficiency under 10CFR50.55(e) criteria.

Cause of the Deficiency Failure to design the Excitation Control System Cabinet ventilation to provide the specified ambient temperature for the DG Excitation Con-trol System Components for the room ambient temperature conditions defined in the FSAR.

Actions to Prevent Recurrence There are no generic considerations for this deficiency because the two Control Cabinets covered in this report are the only Excitation System Cabinets designed and supplied by this particular vendor for UNP-2. The vendor, International Switchboard Corporation, a Steward and Stevenson Company of Houston, Texas will be informed of the condi-tion and should determine if the condition is applicable to other units.

Corrective Action SPED S218-M-C247 has been issued to provide additional ventilation for the Division 1 and 2 Diesel Generator Excitation Control Cabinets.

The capability of this design change to provide the specified ambient temperature conditions for the Excitation System Components for the room ambient conditions defined in the FSAR will be verified by test prior to Fuel Load.