05000352/LER-2002-001, Re Inoperable Safeguard Battery Charger Discovered During Review of Completed Surveillance Test
| ML021560539 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 05/16/2002 |
| From: | Levis W Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER-02-001-00 | |
| Download: ML021560539 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(x) 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 |
| 3522002001R00 - NRC Website | |
text
ExeIon.
Exelon Nuclear Limerick Generating Station PO. Box 2300 Sanatoga, PA 19464 www.exeloncorp.comn Nucl ear 1 OCFR5 0.73 May 16, 2002 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 1-02-001, Unit 1 Inoperable Safeguard Battery Charger Resulted in a Condition Prohibited By Technical Specifications This Licensee Event Report (LER) addresses the inoperability of a Safeguard Battery Charger following maintenance and testing that resulted in a noncompliance with Technical Specification requirements for operable direct current (DC) sources.
Report Number:
Revision:
Event Date:
Discovered Date:
Report Date:
1-02-001 00 March 9, 2002 March 19, 2002 May 16, 2002 This LER is being submitted pursuant to the requirements of 10CFR50.73(a)(2)(i)(B).
If you have any questions or require additional information, please do not hesitate to contact us.
Sincerely, Lt A William Levis Vice President - Limerick cc: H. J. Miller, Administrator Region I, USNRC A. L. Burritt, USNRC Senior Resident Inspector, LGS
- 15
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FACILITY NAME (1)
DOCKET NUMBER (2)
PAGE (3)
Limerick Generating Station, Unit 1 05000 352 1 OF 4
TITLE (4)
Inoperable Safeguard Battery Charger Discovered During Review of Completed Surveillance Test.
EVENT DATE (5)
LER NUMBER (6)
REPORT DATE (7)
OTHER FACILITIES INVOLVED (8)
SEUN1LRVFACILITY NAME DOCKET NUMBER MO DAY YEAR YEAR NUMBER NO MO DAY YEAR FACILITYNAME DOCK05000 FACILITY NAME DOCKET NUMBER 03 09 2002 2002 001 00 05 16 2002 05000 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO TE RFEQUIREMENTS OF 10 C R (Check all that apply) (11)
MODE (9) 2 20.2201 (b)
_ 20.2203(a)(3)(ii)
_ 50.73(a)(2)(ii)(B) 50.73(a)(2)(ix)(A)
POWER 20.2201 (d)
_20.2203(a)(4) 50.73(a)(2)(iii)
_50.73(a)(2)(x)
LEVEL (10) 001 20.2203(a)(1) 50.36(c)(1)(i)(A) 50.73(a)(2)(iv)(A) 73.71 (a)(4) 20.2203(a)(2)(i) 50.36(c)(1)(ii)(A) 50.73(a)(2)(v)(A) 73.71 (a)(5) 20.2203(a)(2)(ii) 50.36(c)(2) 50.73(a)(2)(v)(B)
OTHER
_Specify in Abstract below or in 20.2203(a)(2)(iii) 50.46(a)(3)(ii) 50.73(a)(2)(v)(C)
(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)
Cause of the Event
The test performers failed to identify the unsatisfactory test results during performance of the test because they relied on the test computer program alarm. The alarm did not actuate since there was no test direction for establishing a setpoint. Also, the surveillance test relied on performer observation of the test equipment and did not require a detailed review of the chart data prior to the performer signoff for a successful test.
A contributing cause was that the charger maintenance procedure did not ensure the current limiter card potentiometer as-left position following calibration was not near the mechanical stop.
Corrective Action Completed The Safeguard Battery Charger current limiter card was re-calibrated and the 24-month load test surveillance was performed successfully.
The charger periodic maintenance procedure has been revised to minimize temperature-related setpoint drift by ensuring the post-calibration position of the current limiter card potentiometer is not near the mechanical stop.
Corrective Actions Planned The charger load test surveillance procedure will be revised to verify proper setting of all alarm points during the test and ensure the chart data is reviewed prior to test acceptance and performer signoff. This action will be completed by August 15, 2002.
Previous Similar Occurrences There were no previous occurrences of Safeguard Battery Charger failures due to maintenance procedure weaknesses.
Failed component information
Component:
Battery Charger Manufacturer:
C&D Batteries, Eltra Corp Model:
ARR13OK300F