05000352/LER-2009-001, Regarding Neutron Flux Accident Monitoring Instrumentation Inoperable
| ML090721078 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 03/13/2009 |
| From: | Mudrick C Exelon Generation Co, Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 09-001-00 | |
| Download: ML090721078 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 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)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(x) |
| 3522009001R00 - NRC Website | |
text
10CFR50.73 March 13, 2009 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Unit 1 Facility Operating License No. NPF-39 NRC Docket No. 50-352 Subject: LER 2009-001-00, Neutron Flux Accident Monitoring Instrumentation Inoperable This Licensee Event Report (LER) addresses an event that resulted in a condition prohibited by Technical Specifications due to accident monitoring instruments that were inoperable for periods that exceeded the allowable outage times. The apparent cause of this event was a weakness in the Technical Specification Bases for accident monitoring instrumentation.
This LER is being submitted pursuant to the requirements of 10CFR50.73(a)(2)(i)(B).
There are no commitments contained in this letter.
If you have any questions or require additional information, please do not hesitate to contact us.
Sincerely, Original signed by Christopher H. Mudrick Vice President - Limerick Generating Station Exelon Generation Company, LLC cc: S. J. Collins, Administrator Region I, USNRC E. M. DiPaolo, USNRC Senior Resident Inspector, LGS
NRC FORM 366 (9-2007)
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (9-2007)
LICENSEE EVENT REPORT (LER)
(See reverse for required number of digits/characters for each block)
APPROVED BY OMB NO. 3150-0104 EXPIRES 08/31/2010
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 1. FACILITY NAME Limerick Generating Station, Unit 1
- 2. DOCKET NUMBER 05000352
- 3. PAGE 1 of 5
- 4. TITLE:
Neutron Flux Accident Monitoring Instrumentation Inoperable
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL NUMBER REV NO.
MONTH DAY YEAR FACILITY NAME DOCKET NUMBER 05000 01 16 2009 2009 - 001 - 00 03 13 2009 FACILITY NAME DOCKET NUMBER 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 1
- 10. POWER LEVEL 100 20.2201(b) 20.2201(d) 20.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(2)(ii) 20.2203(a)(2)(iii) 20.2203(a)(2)(iv) 20.2203(a)(2)(v) 20.2203(a)(2)(vi) 20.2203(a)(3)(i) 20.2203(a)(3)(ii) 20.2203(a)(4) 50.36(c)(1)(i)(A) 50.36(c)(1)(ii)(A) 50.36(c)(2) 50.46(a)(3)(ii) 50.73(a)(2)(i)(A) 50.73(a)(2)(i)(B) 50.73(a)(2)(i)(C) 50.73(a)(2)(ii)(A) 50.73(a)(2)(ii)(B) 50.73(a)(2)(iii) 50.73(a)(2)(iv)(A) 50.73(a)(2)(v)(A) 50.73(a)(2)(v)(B) 50.73(a)(2)(v)(C) 50.73(a)(2)(v)(D) 50.73(a)(2)(vii) 50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(ix)(A) 50.73(a)(2)(x) 73.71(a)(4) 73.71(a)(5)
OTHER Specify in Abstract below or in (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17)
The Daily Surveillance Log/OPCONs 1,2,3 (ST-6-107-590-1 and ST-6-107-590-2) were revised to include steps to verify no more than two SRMs and no more than six IRMs are inoperable in OPCON
- 1.
Corrective Actions Planned The TS 3.3.7.5 Bases for accident monitoring instrumentation will be revised to clarify the site methods for meeting the accident monitoring instrumentation requirements.
Licensed operator training will be revised to reinforce the requirements for maintaining the accident monitoring instrumentation channels operable.
Previous Similar Occurrences There were no previous similar events other than the events being reported in this LER during the last three years regarding inoperable accident monitoring instrumentation that resulted in a condition prohibited by Technical Specifications.
Component data:
Component data:
Component Description:
Source Range Monitors System:
IG Incore/Excore Monitoring System Component:
DET (Detector)
Component Number:
C51-1K600A Manufacturer:
G080 General Electric Company Model Number:
368X101BBG003