05000374/LER-2010-001, Regarding High Pressure Core Spray System Declared Inoperable Due to Failed Room Ventilation Control Relay
| ML103360043 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 11/24/2010 |
| From: | Karaba P Exelon Generation Co, Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA10-083 LER 10-001-00 | |
| Download: ML103360043 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v), Loss of Safety Function 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)(i)(B), Prohibited by Technical Specifications |
| 3742010001R00 - NRC Website | |
text
iExelonr, LaSalle Generating Station www.exeloncorp.com 2601 NoTth 21st Road Nuclear MaTseilles, IL 61341-9757 10 CFR 50.73 RA10-083 November 24, 2010 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Unit 2.
Facility Operating License No. NPF-18 NRC Docket No. 50-374
Subject:
Licensee Event Report 2010-001-00 In accordance with 10 CFR 50.73(a)(2)(v)(D), Exelon Generation Company (EGC), LLC, is submitting Licensee Event Report Number 2010-001-00.
There are no regulatory commitments in this report. Should you have any questions concerning this report, please contact Mr. Terrence W. Simpkin, Regulatory Assurance Manager at (815) 415-2800.
Peter J. Karaba Plant Manager LaSalle County Station
Enclosure:
Licensee Event Report Cc:
Regional Administrator - NRC Region.111 NRC Senior Resident Inspector - LaSalle County Station
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2013 (10-2010)
, the NRC may sfor each block)inot conduct or sponsor, and a person is not required to respond to, the digits/characters frecblk)information collection.
- 3. PAGE LaSalle County Station, Unit 2 05000374 1 OF 3
- 4. TITLE High Pressure Core Spray System Declared Inoperable Due to Failed Room Ventilation Control Relay
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NSEUENTIAL REV MONTH DAY YEAR N/A N/A NUMBER NO.
FACILITY NAME DOCKET NUMBER 09 25 2010 2010 01 00 11 24 2010 N/A N/A
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
El 20.2201(b)
El 20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii) 001 El 20.2201(d)
El 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A)
El 50.73(a)(2)(viii)(A)
El 20.2203(a)(1)
El 20.2203(a)(4)
[E 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B)
E] 20.2203(a)(2)(i)
El 50.36(c)(1)(i)(A)
El 50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii)
El 50.36(c)(1)(ii)(A)
[3 50.73(a)(2)(iv)(A)
[] 50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
El 50.36(c)(2)
[I 50.73(a)(2)(v)(A)
El 73.71(a)(4) 100 [E 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
El 73.71(a)(5)
El 20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
[I 50.73(a)(2)(v)(C)
[E OTHER El 20.2203(a)(2)(vi)
El 50.73(a)(2)(i)(B)
ED 50.73(a)(2)(v)(D)
Specify in Abstract below or in E.
CORRECTIVE ACTIONS
o The failed relay was replaced, and post maintenance testing was completed satisfactorily.
The classification of the relay was changed to high duty cycle, and appropriate time-based replacements were established.
F.
PREVIOUS OCCURRENCES
On June 11, 2008, at 0545 CDT, the supply fan for the Unit 2 Division 3 Switchgear Room ventilation system tripped unexpectedly. The direct cause of the supply fan trip was a failure of the fan motor stator winding. The apparent root cause was a failure to implement a time-based refurbishment program, which allowed the motor to be in-service beyond the expected lifetime of 20 years. Corrective actions included replacing the fan motor, and updating the preventative maintenance database to require replacement and/or refurbishment of these motors on a 20-year periodicity (LER 374/2008-001-00).
G. COMPONENT FAILURE DATA
Potter and Brumfield, CS Series Sensors, CSJ-38-7001 0