05000455/LER-2010-002, Regarding Essential Service Water System Inoperable Due to Inadequate Seismic Restraint from Original Construction Error
| ML102180179 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/03/2010 |
| From: | Enright D Exelon Corp, Exelon Generation Co, Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BYRON 2010-0090 LER 10-002-00 | |
| Download: ML102180179 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2) 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 |
| 4552010002R00 - NRC Website | |
text
Exelon Exelon Generation Company, LLC www.exeloncorp.com Byron Station NUdear 4450 North German Church Road Byron,.IL 61010-9794 August 3,2010 LTR:
BYRON 2010-0090 10 CFR 50.73 File:
1.10.0101 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Byron Station, Unit 2 Facility Operating License No. NPF-66 NRC Docket No. STN 50-455 Subject: Licensee Event Report 2010-002-00, "Essential Service Water System Inoperable Due to Inadequate Seismic Restraint from Original Construction Error" The enclosed Licensee Event Report (LER) is being submitted in accordance with 10 CFR 50.73, "Licensee event report system." The LER involves the discovery of inadequate seismic restraint of the safety related Essential Service Water Lines attached to a non-safety related Containment Ventilation Chiller.
There are no regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact Mr. David Gudger, Regulatory Assurance Manager, at (815) 406-2800.
Respectfully,
/.~ 7 Daniel Enright Site Vice President Byron Station
Enclosure:
LER Number 2010-002-00
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007)
, the NRC may digits/characters for each block) not conduct or sponsor, and a person is not required to respond to, the d information collection.
- 3. PAGE Byron Station, Unit 2 05000455 1 Of 3
- 4. TITLE Essential Service Water System Inoperable Due to Inadequate Seismic Restraint from Original Construction Error
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED I
ACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEI UENTRAL REV MONTH DAY YEAR Byron Station, Unit 1 05000454 FACILITY NAME DOCKET NUMBER 06 04 10 2010 002 00 08 03 2010
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
S20.2201(b)
[I 20.2203(a)(3)(i)
[I 50.73(a)(2).(i)(C)
El 50.73(a)(2)(vii)
El 20.2201(d)
El 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A) 0l 50.73(a)(2)(viii)(A)
El 20.2203(a)(1)
[I 20.2203(a)(4) 0 50.73(a)(2)(ii)(B)
[I 50.73(a)(2)(viii)(B)
O 20.2203(a)(2)(i)
El 50.36(c)(1)(i)(A) 0l 50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii)
[I 50.36(c)(1)(ii)(A)
[E 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x) 0l 20.2203(a)(2)(iii)
El 50.36(c)(2)
[] 50.73(a)(2)(v)(A) 0l 73.71 (a)(4) 100 El 20.2203(a)(2)(iv) 0l 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
El 73.71 (a)(5)
El 20.2203(a)(2)(v)
[I 50.73(a)(2)(i)(A) 0l 50.73(a)(2)(v)(C)
El OTHER El 20.2203(a)(2)(vi)
El 50.73(a)(2)(i)(B) 0l 50.73(a)(2)(v)(D)
Specify in Abstract below or in E.
Previous Occurrences
LER 454 2008-001-00, "Technical Specification Non-Compliance of Containment Sump Monitor Due to Improper Installation During Original Construction." Corrective actions for this event would not have reasonably led to the discovery of this condition.
~fl CflO&A ~atA ro~Oflfl7t NFIC FORM 366A t--2007' PRINTED ON RECYCLED PAPER