05000458/LER-2015-002, Regarding Emergency Diesel Generator Start Circuit Actuation Due to Loss of Power from Reserve Station Service No. 2

Regarding Emergency Diesel Generator Start Circuit Actuation Due to Loss of Power from Reserve Station Service No. 2

ML15149A149
Person / Time
Site:	River Bend  (NPF-047)
Issue date:	05/05/2015
From:	Brumfield N Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RBG-47564 LER 15-002-00
Download: ML15149A149 (5)

LER-2015-002, Regarding Emergency Diesel Generator Start Circuit Actuation Due to Loss of Power from Reserve Station Service No. 2

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
4582015002R00 - NRC Website

text

S"Entergy Entergy Operations, Inc.

River Bend Station 5485 U.S. Highway 61 N St. Francisville, LA 70775 RBG-47564 May 5, 2015 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Subject:

Licensee Event Report 50-458 / 2015-002-00 River Bend Station - Unit 1 Docket No. 50-458 License No. NPF-47 RBF1-15-0063

Dear Sir or Madam:

In accordance with 10 CFR 50.73, enclosed is the subject Licensee Event Report.

This document contains no commitments. If you have any questions, please contact Mr. Joseph Clark at 225-381-4177.

Sincerel N. Todd Brumfield Director - Regulatory & Performance Improvement NTB/dhw Enclosure cc:

U. S. Nuclear Regulatory Commission Region IV 1600 East Lamar Blvd.

Arlington, TX 76011-4511 NRC Sr. Resident Inspector P. 0. Box 1050 St. Francisville, LA 70775

ý rJ

Licensee Event Report 50-458 / 2015-002-00 May 5, 2015 RBG-47564

.Page 2 of 2 INPO (via ICES reporting)

Central Records Clerk Public Utility Commission of Texas 1701 N. Congress Ave.

Austin, TX 78711-3326 Department of Environmental Quality Office of Environmental Compliance Radiological Emergency Planning and Response Section Ji Young Wiley P.O. Box 4312 Baton Rouge, LA 70821-4312

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 0113112017 (02-2014)

Estimated burden per response to comply with this mandatory collection request: 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />.

Reported lessons learned are incorporated into the licensing process and fed back to industry.

Send comments regarding burden estimate to the FOIA, Privacy and Information Collections Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by

.LICENSEE EVENT REPORT (LER) internet e-mail to Infocollects.Resource@nrcgov, and to the Desk Officer, Office of Information and (See Page 2 for required number of RegulatoryAffairs, 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 digits/characters for each block) control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.

3. PAG River Bend Station - Unit 1 05000 458 1 OF

4. TITLE Emergency Diesel Generator Start Circuit Actuation Due to Loss of Power from Reserve Station Service No. 2

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED SEHUENTIAL REV MONT DAY REA FACILITY NAME DOCKET NUMBER MO YEA MONTH DAY YEAR R

05000 FAIIYNAME DOCKET NUMEER 3

7 2015 2015 002 00 05 05 2015 05000

9. OPERATING MODE

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)

El 20.2201(b)

[]

20.2203(a)(3)(i)

E] 50.73(a)(2)(i)(C)

E] 50.73(a)(2)(vii) 5[

20.2201(d)

[--'20.2203(a)(3)(ii)

E] 50.73(a)(2)(ii)(A)

[] 50.73(a)(2)(viii)(A)

El 20.2203(a)(1)

[]

20.2203(a)(4)

E] 50.73(a)(2)(ii)(B)

[

50.73(a)(2)(viii)(B)

[] 20.2203(a)(2)(i)

[

50.36(c)(1)(i)(A) 50.73(a)(2)(iii)

El 50.73(a)(2)(ix)(A)

10. POWER LEVEL El 20.2203(a)(2)(ii)

[

50.36(c)(1)(ii)(A) 50.73(a)(2)(iv)(A)

El 50.73(a)(2)(x)

El 20.2203(a)(2)(iii)

[] 50.36(c)(2)

[] 50.73(a)(2)(v)(A)

[] 73.71(a)(4)

[] 20.2203(a)(2)(iv)

[ 50.46(a)(3)(ii) 50.73(a)(2)(v)(B)

[] 73.71 (a)(5)

El 20.2203(a)(2)(v)

El 50.73(a)(2)(i)(A)

E] 50.73(a)(2)(v)(C)

El OTHER 20.2203(a)(2)(vi) 50.73(a)(2)(i)(B) 50.73(a)(2)(v)()

Specify in Abstract below or in l 2 CAUSAL ANALYSIS The apparent cause of this event was inadequate work practices on the part of the electricians, in that they did not take all available precautions prior to performing the voltage check. The workers recognized the adverse conditions, but did not recognize the need to put into place any robust barriers. The electricians' successful past performance of this type of task likely led to overconfidence.

Reviewers of the work package didn't challenge the potential risks or identify a most error-likely task.

CORRECTIVE ACTION TO PREVENT RECURRENCE A human performance error review was conducted with the contract electricians involved in this event and their supervisors. The contractor held an all-hands stand-down to reinforce human performance expectations.

PREVIOUS OCCURRENCE EVALUATION No similar events have been reported by River Bend Station in the last 3 years.

SAFETY SIGNIFICANCE

The EDG start logic responded as designed to the loss of power on the Division 2 electrical systems. This event did not involve any interruption of the shutdown cooling function. This event was, thus, of minimal safety significance with respect to the health and safety of the public.