05000362/LER-2009-001, Regarding Component Declared Inoperable After LCO Time Limit
| ML093210132 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/16/2009 |
| From: | Southern California Edison Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 09-001-00 | |
| Download: ML093210132 (2) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 3622009001R00 - NRC Website | |
text
An EDISON INTERNATIONAL Company November 16, 2009 U.S. Nuclear Regulatory Commission Document Control Desk W,ashington, D.C. 20555-0001
Subject:
Docket No. 50-362 Licensee Event Report No. 2009-001 San Onofre Nuclear Generating Station, Unit 3
Dear Sir or Madam:
This submittal provides Licensee Event Report (LER) 2009-001 to report a failure to comply with the requirements of the Technical Specifications at Unit 3 on September 14, 2009, pursuant to 10 CFR 50.73(a)(2)(i)(B).
Technical Specification 3.8.1, "AC Sources - Operation," Limiting Condition for Operation B.2, requires declaring redundant supported components inoperable within four hours when a diesel generator is out of seNice. The action to declare features of supported Post Accident Monitoring Instrumentation (PAMI) inoperable was performed late.
All safety systems and components were returned to service within the allowable time limits. This event did not affect the health and safety of either plant personnel or the public.
If you require any additional information, please contact me.
Sincerely, Unit 3 LER No. 2009-001 cc:
E. E. Collins, NRC Regional Administrator, Region IV G. G. Warnick, NRC Senior Resident Inspector, San Onofre Units 2 &3 P.O. Box 128 San Clemente, CA 92672
Abstract
On 9/15/09 (Event Date) at 0030 PDT, with Unit 3 at 100 percent power, operators determined Limiting Condition of Operation (LCO) 3.8.1 B.2 for the Emergency Diesel Generators (EDG) was not met. Post-Accident Monitoring Instrumentation (PAMI) is required by TS 3.3.11 and is supported by the EDGs because the mission time exceeds the battery capacity. Some of the PAMI indications are displayed to the operators by the Qualified Safety Parameter Display System (QSPDS).
LCO 3.8.1 B.2 requires declaring EDG supported features inoperable within four hours. On 9/14/09 at 1200 EDG Train B failed a surveillance test; however, it was not identified that QSPDS Train A had been previously removed from service to repair a display monitor. Both trains of QSPDS were returned to service at 1728. At 0030 on 9/15 it was discovered QSPDS Train B had not been declared inoperable by 1600 as required, and a late log entry was made.
The apparent causes were an inadequate procedure, a failure to adequately assess the emergent equipment failure for cross-train impact, and failure to recognize QSPDS as integral to PAMI.
Corrective actions revised the EDG surveillance procedure to emphasize QSPDS is part of PAMI, and issued a required reading on preventing an inadvertent loss of safety function. There was no safety significance as components were restored to service within the allowable time limits.