05000461/LER-2019-001, Main Feed Breaker Failed to Close During Bus Shift

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Main Feed Breaker Failed to Close During Bus Shift
ML19205A067
Person / Time
Site: Clinton Constellation icon.png
Issue date: 07/19/2019
From: Stoner T
Exelon Generation Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
U-604498 LER 2019-001-00
Download: ML19205A067 (4)


LER-2019-001, Main Feed Breaker Failed to Close During Bus Shift
Event date:
Report date:
Reporting criterion: 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)(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)(v), Loss of Safety Function

10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown

10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications

10 CFR 50.73(a)(2)(vii), Common Cause Inoperability

10 CFR 50.73(a)(2)(i)
4612019001R00 - NRC Website

text

Clinton Power Station 8401 Power Road Clinton, IL 61727 U-604498 July 19, 2019 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Clinton Power Station, Unit 1 Facility Operating License No. NPF-62 NRC Docket No. 50-461 Subject: Licensee Event Report 2019-001-00

,A If Exelon Generation 10 CFR 50.73 SRRS 5A.108 Enclosed is Licensee Event Report (LER) 2019-001-00: Main Feed Breaker Failed to Close During Bus Shift. This report is being submitted in accordance with the requirements of 10 CFR 50.73.

There are no regulatory commitments contained in this report.

Should you have any questions concerning this report, please contact Mr. Dale Shelton, Regulatory Assurance Manager, at (217) 937-2800.

Respectfully, Theodore R. Stoner Site Vice President Clinton Power Station

Attachment:

Licensee Event Report 2019-001-00 cc:

Regional Administrator - Region Ill NRC Senior Resident Inspector - Clinton Power Station Office of Nuclear Facility Safety - Illinois Emergency Management Agency

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 03/31/2020 (04-2018)

, the NRG may not ccnduct or sponsor, and a person is not required to respond to, tlle information ccl/ection.

3.Page Clinton Power Station, Unit 1 05000461 1

OF 3

4. Title Main Feed Breaker Failed to Close During Bus Shift
5. Event Date
6. LEA Number
7. Report Date
8. Other Facilities Involved I

Sequential I Rev Facility Name Docket Number Month Day Year Year Number No.

Month Day Year 05000 Facility Name Docket Number 05 22 2019.

2019 -

001 00 07 19 2019 05000

9. Operating Mode
11. This Report is Submitted Pursuant to the Reqµirements of 1 O CFR §: {Check all that apply)

D 20.2201(b)

D. 20:2203(a)(3)(il D 50.73(a)(2)(ii)(A)

D 50.73(a)(2)(viii)(A)

D 20.2201(d)

D 2D.2203(a)(3)(ii)

D 50.73(a)(2)(ii)(B)

D 50. 73(a)(2)(viii)(B) 1 D

D D

D 20.2203(a)(1) 20.2203(a)(4) 50.73(a)(2)(iii) 50.73(a)(2)(ix)(A)

D 20.2203(a)(2)(i)

D 50.36(c)(1)(i)(A)

D 50.73(a)(2)(iv)(A)

D 50.73(a)(2)(x) 1 O. Power. Level D 20.2203(a)(2)(ii)

D 50.36(c)(1 )(ii)(A)

D 50.73(a)(2)(v)(A)

D 73.71 (a)(4)

D 20.2203(a)(2)(iii)

D 50.36(c)(2)

D 50.73(a)(2)(v)(B)

D 73.71 (a)(5)

D 20.2203(a)(2)(iv)

D 50.46(a)(3)(ii)

D 50.73(a)(2)(v)(C)

D 73.77(a)(1) 098 D 20.2203(a)(2)(v)

D 50.73(a)(2)(i)(A)

D 50.73(a)(2)(v)(D)

D 73.77(a)(2)(i)

D 20.2203(a)(2)(vi)

~ 50.73(a)(2)(i)(B)

D 50.73(a)(2)(vii)

D 73.77(a)(2)(ii)

D 50.73(a)(2)(i)(C)

D Other (Specify in Abstract below or in C.

Cause of the Event

YEAR 2019 -

SEQUENTIAL NUMBER 001 The cause of this event is under investigation. The causal factors that resulted in this condition and the associated corrective actions will be provided in a revision to this Licensee Event Report (LER).

D.

Safety Consequences

REV NO.

00 There were no safety consequences associated with the event described in this report as the affected bus remained energized from the reserve feed (ERAT). If the ERAT had become inoperable the DGs were available to start and provide power to the bus. Because Limiting Condition for Operation (LCO) 3.8.1, "ELECTRICAL POWER SYSTEMS - AC Sources - Operating," Condition A, was not entered from April 7, 2019 until the condition was discovered on May 22, 2019, this event is reportable in accordance with 10 CFR 50.73(a)(2)(i)(B) as, "any operation or condition which was prohibited by the plant's Technical Specifications."

E.

Corrective Actions

Feed breaker 1 AP07EK was replaced and tested satisfactory. Additional corrective actions will be provided in a supplemental LER, as appropriate.

F.

Previous Similar Occurrences There were no previous events identified involving a breaker failure similar to the occurrence described in this licensee event report.

G.

Component Failure Data

Manufacturer: Westinghouse Component Type: DHP 350, 4160 Volt Power Circuit Breaker Page _3_ of _3_