05000373/LER-2003-001, From LaSalle, Unit 1 Regarding Enforcement Discretion Required to Repair Division 2 125 Vdc Battery Charger

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From LaSalle, Unit 1 Regarding Enforcement Discretion Required to Repair Division 2 125 Vdc Battery Charger
ML031640404
Person / Time
Site: LaSalle 
Issue date: 06/06/2003
From: Landahl S
Exelon Generation Co, Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 03-001-00
Download: ML031640404 (4)
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LER-2003-001, From LaSalle, Unit 1 Regarding Enforcement Discretion Required to Repair Division 2 125 Vdc Battery Charger
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
10 CFR 50.73(a)(2)
3732003001R00 - NRC Website
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text

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-,i Exekn.m Exelon Generation Company, LLC LaSalle County Station 2601 North 21"Road Marseilles, IL 61341-9757 www.exeloncoTp.Con Nuclear June 6, 2003 10 CFR 50.73 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Unit 1 Facility Operating License No. NPF-1 1 NRC Docket No. 50-373

Subject:

Licensee Event Report In accordance with 10 CFR 50.73(a)(2)(i)(B), Exelon Generation Company, (EGC), LLC, is submitting Licensee Event Report Number 03-001-00, Docket No. 050-373.

Should you have any questions concerning this letter, please contact Mr. Glen Kaegi, Regulatory Assurance Manager, at (815) 415-2800.

Respecffully, Susan Landahl Plant Manager LaSalle County Station

Attachment:

Licensee Event Report cc:

Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station L-

NIRC FORM 366 US. NUCLEAR REGULATORY APPROVED BY OMB NO. 3150-0104 EXPIRES 7-31-2004 (7-2001)

COMMISSION

, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.

1.FACILITYNAME LaSalle County Station, Unit 1 2.DOCKETNUMBER 3.PAGE 05000373 1 of 3 4.TITLE Enforcement Discretion Required To Repair Division 2 125 VDC Battery Charger

5.

EVENT DATE

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LER NUMBER r 7. REPORT DATE

8. OTHER FACILMES INVOLVED MO DAY YEAR YEAR SEQUENTIAL REV MO DAY YEAR FACILITY NAME DOCKETNUMBER 4

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

MODE 1A POWER 100 LEVEL__

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12. LICENSEE CONTACT FOR THIS LER NAME TELEPHONE NUMBER (Include Area Code)

Al Parker, Plant Engineering (815) 415-2657CAUSE SYSTEM COMPONENT MANU-REPORTABLE

CAUSE

SYSTEM COMPONENT MANU-REPORTABLE FACTURER TOEPIX

<is FACTURER TO EPIX

14. SUPPLEMENTAL REPORT EXPECTED
15. EXPECTED MONTH DAY YES I 3 I NO SUBMISSION If

,complete EXPECTED SUBMISSION DATE)

ISI DATE

ABSTRACT

On April 7, 2003, terminal voltage.

(TS) Surveillance oscillations were observed in the Unit 1 Division 2 125 VDC battery The system remained operable because the Technical Specification Requirements (SR) were still met.

Repairs to the 125 VDC battery charger were estimated to take 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, which was in excess of the two hours of system inoperability allowed by TS.

In order to repair the battery charger while precluding a shutdown transient on the plant, a Notice of Enforcement Discretion was requested from the NRC, which was granted on April 9, 2003.

Repairs began at 1742 hours0.0202 days <br />0.484 hours <br />0.00288 weeks <br />6.62831e-4 months <br /> on April 9, 2003.

Planned work was completed and the system was returned to operable status at 0407 hours0.00471 days <br />0.113 hours <br />6.729497e-4 weeks <br />1.548635e-4 months <br /> on April 10, 2003, after 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> and 25 minutes of inoperability. The voltage oscillations continued, although at a reduced level.

On April 28, 2003, the 125 VDC feed to fire protection inverter lFPOlE was isolated and the oscillations stopped.

Troubleshooting of lFPOlE continues.

The safety significance of the additional 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of Division 2 inoperability granted was minimal, since the Division 1 and 3 125 VDC subsystems remained operable.

NRC FORM 366 (7-2001)

_ MRC EORM 366A US. NUCLEAR REGULATORY COMMISSION (7-2001)

LICENSEE EVENT REPORT (LER)

6. LER NUMBER
3. PAGE YEAR I

SEQUENllAL REVISION I

NUMBER NUMBER LaSalle County Station, Unit 1 05000373 03 001 00 2 of 3

17. NARRATIVE (if more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A)

The Unit 1 Division 2 125 VDC electrical power distribution subsystem was inoperable for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> and 25 minutes.

Since this was in excess of the two hours allowed by the TS Required Actions identified above, this event is reportable under 10 CFR 50.73(a)(2)(i)(B) as an operation or condition prohibited by the plant's Technical Specifications.

On April 11, 2003, a written Request for Notice of Enforcement Discretion was submitted to the Commission.

C.

CAUSE OF EVENT

Following the repairs performed on April 9, 2003, the voltage and current oscillations were reduced.

On April 28, 2003, the 125 VDC feed to fire protection inverter lFPOlE was isolated and the oscillations stopped.

Troubleshooting of lFPOlE continues.

D.

SAFETY ANALYSIS

The safety significance of allowing continued operation for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> and 25 minutes with an inoperable 125 VDC battery charger and electrical power distribution system was minimal.

The redundant Division 1 and Division 3 subsystems of Class 1E 125 VDC power were operable throughout the event.

E.

CORRECTIVE ACTIONS

The DC feed to lFPOlE has been removed.

Troubleshooting of the FPOlE continues.

F.

PREVIOUS OCCURRENCES

A review of Licensee Event Reports over the previous 10 years found no previous or similar occurrences.

G.

COMPONENT FAILURE DATA

Troubleshooting of lFPOlE is in progress.

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