05000373/LER-2022-004, Both Trains of Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable Due to Compressor Trips
| ML22362A015 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 12/28/2022 |
| From: | Van Fleet J Constellation Energy Generation, Exelon Generation Co LLC |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| RA22-054 LER 2022-004-00 | |
| Download: ML22362A015 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2) 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 |
| 3732022004R00 - NRC Website | |
text
Constellation~
.J,'* *.
LaSalle County Station 2601 North 21 " Road Marseilles. IL 61341 815-415-2000 Telephone 10 CFR 50.73 RA22-054 December 28, 2022 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Subject:
LaSalle County Station, Units 1 and 2 Renewed Facility Operating License No. NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374 Licensee Event Report 2022-004-00, Both Trains of Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable due to Compressor Trips.
In accordance with 10 CFR 50.73(a)(2)(v)(D), Exelon Generation Company, LLC (EGC) is submitting Licensee Event Report (LER) Number 2022-004-00 for LaSalle County Station, Units 1 and 2.
There are no regulatory commitments in this letter. Should you have any questions concerning this report, please contact Mr. Dan Mearhoff, Regulatory Assurance Manager, at (815) 415-2800.
Respectfully, frJ/4~
John Van Fleet Jr Plant Manager LaSalle County Station
Enclosure:
Licensee Event Report cc:
Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station
NRCFORM366 (08-2020)
U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 08/31/2023
- 1. Faclllty Name LICENSEE EVENT REPORT (LER)
(See Page 3 for required number of digits/characters for each block)
(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1022/r3/)
LaSalle County Station, Unit 1
- 4. TIiie
- 2. Docket Number
- 3. Page 05000 - 373 1 OF 5 Both Trains of Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable due to Compressor Trips.
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facllltles Involved Sequential Revision Faclllty Name Docket Number Month Day Year Year Number No.
Month Day Year LaSalle County Station, Unit 2 05000-374 11 04 2022 2022 004 00 12 21 2022 Faclllty Name Docket Number NA NA
- 9. Operating Mode 1
110. Power Level 100 percent
- 11. This Report Is Submitted Pursuant to the Requirements of 10 CFR §: (Check all that apply) 10 CFR Part 20 D 20.2203(a)(2)(vl)
D 50.36(c)(2)
D 50.73(a)(2)(Iv)(A)
D 50.73(a)(2)(x)
- 20.2201(b)
D 20.2203(a)(3)(I)
D 50.46(a)(3)(11)
D 50.73(a)(2)(v)(A) 10 CFII Part 73
~
- 20.2201(d)
D 20.2203(a)(3)(11) 50.69(g) 50.73(a)(2)(v)(B)
D 73.71(a)(4)
D 20.2203(a)(1)
D 20.2203(a)(4)
- 50. 73(a)(2)(I)(A) 50.73(a)(2)(v)(C)
D 73.71(a)(5)
D 20.2203(a)(2)(I) 10 CFR P11!i1' 21
- 50.73(a)(2)(I)(B)
~
50.73(a)(2)(v)(D)
D 73.77(a)(1)(I)
D 20.2203(a)(2)(11)
D 21.2(c)
- 50.73(a)(2)(I)(C) 50.73(a)(2)(vll)
D 73.77(a)(2)(I)
D 20.2203(a)(2)(111) 10 Cfll Pitt. SO
- 50.73(a)(2)(11)(A)
D 50.73(a)(2)(vlil)(A)
D 73.77(a)(2)(11)
D 20.2203(a)(2)(Iv)
- 50.36(c)(1)(I)(A)
- 50.73(a)(2)(11)(B)
D 50.73(a)(2)(vlil)(B)
D 20.2203(a)(2)(v)
- 50.36(c)(1)(1i)(A)
D 50.73(a)(2)(111)
D 50.73(a)(2)(Ix)(A)
D OTHER (Specify here, in abstract, or NRC 366A).
- 12. Licensee Contact for this LER Licensee Contact CJ Smith, Operations Director I
Phone Number (Include area code)
(815) 415-2200 Cause System Component Manufacturer Reportable to IRIS
Cause
System Component Manufacturer Reportable to IRIS B
VI COMP C147 y
I
- 14. Supplemental Report Expected [81 No I D Yes (If yes, complete 15. Expected Submission Date)
- 15. Expectet Submission Date Month Day Year
- 6. Abstract (Limit to 1560 spaces, i.e., approximately 15 single-spaced typewritten lines)
On November 3, 2022, both Units 1 and 2 were in Mode 1 and at 100% power. At 2308 CDT the A Main Control Room Ventilation (VC) Compressor tripped on low oil pressure. The A train of the Main Control Room Ventilation (VC) was declared inoperable. The station swapped to the B VCNE train.
On November 4 at 0006 CDT, the B Auxiliary Electric Room Ventilation (VE) compressor tripped on high oil temperature and the B VE train was declared inoperable. With both the A and B control room area ventilation air conditioning (CRAC) trains inoperable, the system was in a condition that could have prevented fulfillment of a safety function.
The cause of the A VC Compressor trip was a leak on an oil pressure switch sensing line and the cause of the B VE compressor trip was high oil temperature due to slugging.
5
Corrective Actions
Corrective actions taken in response to the conditions were:
Oil was added to the B VE compressor and the compressor was restarted.
Repairs were made to the A VC compressor oil pressure switch sensing lines.
Previous Occurrences
LER 373-2022-003 SEQUENTIAL NUMBER 004 REV NO.
00 On May 20, 2022, both Units 1 and 2 were in Mode 1 and at 100% power. The B train of the Main Control Room Ventilation (VC) and Auxiliary Electric Room Ventilation (VE) was inoperable due to a planned maintenance window. At 0905 and again on 5/23/22 at 1256, various equipment on the A VCNE train tripped following train swaps to support ongoing maintenance activities. This resulted in the A VCNE train being declared inoperable.
With both the A and B trains being simultaneously inoperable, the system was in a condition that could have prevented fulfillment of a safety function. The cause of the event was inadequate breaker settings.
LER 373-2014-004 On August 28, 2014, both Units 1 and 2 were in Mode 1 at 100% power. The 'B' train of Auxiliary Electric Equipment Room ventilation (VE) was inoperable due to a planned repair of an oil leak. At 1227 hours0.0142 days <br />0.341 hours <br />0.00203 weeks <br />4.668735e-4 months <br /> CDT, the A VE compressor was not found to be cycling on and off resulting in the 'A' train of VCNE being declared inoperable. With both trains of VCNE inoperable, this resulted in an event or condition that could have prevented the fulfillment of a safety function. The cause of the event was a shorted wire on liquid line solenoid valve 0RG053A that caused the solenoid valve to close, resulting in the compressor shutting down on low suction pressure. The corrective action was to repair the wiring problem and return the compressor to service.
LER 373-2013-008 On November 22, 2013, both Units 1 and 2 were in Mode 1 at 100% power. The 'A' train of Main Control Room ventilation (VC) was inoperable due to an emergent repair of a Freon leak. At 1920 hours0.0222 days <br />0.533 hours <br />0.00317 weeks <br />7.3056e-4 months <br /> CST, the 'B' AEER Cooler Condenser Fan tripped. An acrid mell was detected coming from the fan motor breaker comp~rtment. The 'B' train of VC and VE was declared inope able. With both trains of VCNE inoperable, this resulted in ~n event or condition that could have prevented the fulfillment of a safety function. The cause of the event was a winding failure of the 'B' AEER Cooler Condenser fan motor. Corrective actions included replacing the failed fan motor and performing a failure analysis to determine the cause of the winding failure.
5
Component Failure Data
Manufacturer: Carrier Corp.
05000-373 Device: A Control Room HVAC Refrigeration Compressor (Model 5H80)
Component ID: 0VC0SCA Manufacturer: Carrier Corp.
YEAR 2022 -
Device: B Aux Electric Equipment Room HVAC Refrigeration Compressor (Model 5H86)
Component ID: 0VE04CB SNRC FORM 366A (08-2020)
SEQUENTIAL NUMBER 004 REV NO.
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