05000458/LER-2006-006

07-26-2006

On May 27, 2006, while the unit was operating at 100 percent power, the determination was made that one of the required offsite power supplies to the Division 3 standby switchgear had been inoperable during the recent plant startup on May 13, 2006. A 4160 volt circuit breaker in one of the power supplies to Division 3 was not functional at the time of the plant startup. This condition does not meet the requirements of Technical Specifications Limiting Condition for Operation 3.0.4. In addition, during the investigation, it was determined that the surveillance test procedure that implements Surveillance Requirement 3.8.1.1 did not include the verification of the alignment of the offsite power supplies to Division 3. A similar condition was also found to exist for Surveillance Requirement 3.8.1.8. These conditions are being reported in accordance with 10CFR50.73(a)(2)(i)(B) as operations prohibited by Technical Specifications. The circuit breaker was subsequently repaired and demonstrated to be functional. The Division 3 emergency diesel generator is the safety-related power source for the Division 3 switchgear, and it was operable at the time this condition was discovered. Therefore, this condition was of minimal safety significance.

LER-2006-006,
River Bend Station - Unit 1
Event date:	05-27-2006
Report date:	07-26-2006
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
4582006006R00 - NRC Website
v • d • e

The Technical Specification Bases will be revised to clarify the applicability of Division 3 to SR 3.8.1.1 and 3.8.1.8.

Training on this condition will be conducted for the Operations and Licensing staffs.

Licensee Event Report

River Bend

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		Reporting criterion
05000458/LER-2006-006	_ge-2-2-- Licensee Event Report 50-458 / 06-006-00 July 26, 2006 RBG-46601 RBF1-06-0120 Page 2 of 2 cc:�U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 NRC Sr. Resident Inspector P. 0. Box 1050 St. Francisville, LA 70775 INPO Records Center E-Mail Mr. Jim Calloway Public Utility Commission of Texas 1701 N. Congress Ave. Austin, TX 78711-3326 Mr. Jeff Meyers Louisiana Department of Environmental Quality Office of Environmental Compliance P.O. Box 4312 Baton Rouge, LA 70821-4312 NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (6-2004) LICENSEE EVENT REPORT (LER) (See reverse for required number of digits/characters for each block) 1. FACILITY NAME River Bend Station - Unit 1 4. TITLE APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06/30/2007 Estimated burden per response to comply with this mandatory collection request: 50 hours. Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Records and FOIA/Privacy Service Branch (T-5 F52), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to infocollects@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection. 2. DOCKET NUMBER 3. PAGE 05000-458 1 of 5 Plant Mode Change with One Offsite Power Supply Inoperable Due to 4.16kv Breaker Alignment ,	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
05000458/LER-2006-007	River Bend Station 5485 U.S. Highway 61N St. Francisville, LA 70775 Tel 225 381 4157Entergy Fax 225 635 5068 dlorfin@entergy.com David N. Lorfing Manager-Licensing December 18, 2006 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Subject:G Licensee Event Report 50-458 / 06-007-00 River Bend Station — Unit 1 Docket No. 50-458 License No. NPF-47 File Nos. G G9.5, G9.25.1.3 RBG-46638 RBF1-06-0189 Ladies and Gentlemen: In accordance with 10CFR50.73, enclosed is the subject Licensee Event Report. This document contains no commitments. Sincerely, David N. Lorfing Manager — Licensing DNL/dhw Enclosure Licensee Event Report 50-458 / 06-007-00 December 18, 2006 RBG-46638 RBF1-06-0189 Page 2 of 2 cc:UU. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 NRC Sr. Resident Inspector P. O. Box 1050 St. Francisville, LA 70775 INPO Records Center E-Mail Mr. Jim Calloway Public Utility Commission of Texas 1701 N. Congress Ave. Austin, TX 78711-3326 Mr. Jeff Meyers Louisiana Department of Environmental Quality Office of Environmental Compliance P.O. Box 4312 Baton Rouge, LA 70821-4312 NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (6-2004) LICENSEE EVENT REPORT (LER) (See reverse for required number of digits/characters for each block) 1. FACILITY NAME River Bend Station - Unit 1 4. TITLE APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06/30/2007 Estimated burden per response to comply with this mandatory collection request: 50 hours. Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Records and FOIA/Privacy Service Branch (T-5 F52), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to infocollects@ nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection. 2. DOCKET NUMBER 3. PAGE 05000-458 1 of 5 Automatic Reactor Scram Due to Inadvertent Isolation of Main Feedwater Headers	10 CFR 50.73(a)(2)(iv), System Actuation

05000458/LER-2006-006

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