05000458/LER-2006-007

12-18-2006

On October 19, 2006, at approximately 5:57 p.m. CDT, an automatic reactor scram occurred in response to a low water level signal (Level 3) in the reactor vessel. This condition was the result of the inadvertent closure of the motor-operated isolation valves in the main feedwater headers supplying the reactor. These valves closed when part of a chart recorder was accidentally dropped on their control switches. The high pressure core spray system automatically actuated as designed when its reactor water level (Level 2) initiation setpoint was reached. The reactor core isolation cooling system was out of service for planned maintenance. Reactor steam pressure began to decrease as expected, and when pressure reached 849 psig approximately three minutes after the scram, the main steam isolation valves (MSIVs) automatically closed. The MSIVs closed because the reactor mode switch was not promptly re-positioned as required by scram response procedures. This event is being reported in accordance with 10CFR50.73(a)(2)(iv) as an automatic actuation of the reactor protection system and the high pressure core system (including the Division 3 diesel generator). Also, primary containment isolation signals actuated as a result of the Level 2 condition and the low reactor steam pressure signal to the MSIVs.

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
River Bend Station - Unit 1
Event date:	10-19-2006
Report date:	12-18-2006
Reporting criterion:	10 CFR 50.73(a)(2)(iv), System Actuation
4582006007R00 - NRC Website
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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-2006-007

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