05000334/LER-2004-001, Re Control Rod Shutdown Bank Anomaly Causes Entry Into Technical Specification 3.0.3
| ML042920072 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/12/2004 |
| From: | Pearce L FirstEnergy Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-04-131 LER 04-001-00 | |
| Download: ML042920072 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 3342004001R00 - NRC Website | |
text
FENOC FirstEnergy Nuclear Operating Company Beaver Valley Power Station Route 168 PO. Box4 Shippingport, PA 15077-0004 L. William Pearce Site Vice President 724-682-5234 Fax. 724-643-8069 October 12, 2004 L-04-131 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 License No. DPR-66 LER 2004-001-00 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 In accordance with Appendix A, Beaver Valley Technical Specifications, the following Licensee Event Report is submitted:
LER 2004-001-00, 10 CFR 50.73(a)(2)(i)(B), "Control Rod Shutdown Bank Anomaly Causes Entry Into Technical Specification 3.0.3."
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6v4 LeC L. William Pearce Attachment c:
Mr. T. G. Colburn, NRR Senior Project Manager Mr. P. C. Cataldo, Sr. Resident Inspector Mr. S. J. Collins, NRC Region I Administrator INPO Records Center (via electronic image)
Mr. L. E. Ryan (BRP/DEP) 7- --Z~
Abstract
On 8/14/2004 at 0740 hours0.00856 days <br />0.206 hours <br />0.00122 weeks <br />2.8157e-4 months <br /> during performance of the normally scheduled Control Rod Assembly Partial Movement Surveillance Test at Beaver Valley Power Station (BVPS) Unit 1, the operator performing the test observed an unexpected condition during the insertion of control rod Shutdown Bank "A" which showed Group II rods at 223 steps withdrawn, two steps higher than expected. When the expected response to the rod motion was not received, the surveillance test was stopped. The BVPS Unit 1 Technical Specification (TS) 3.1.3.5 requires shutdown bank control rods to be withdrawn at least 225 steps except during surveillance testing. There are no applicable action requirements for a whole bank not being withdrawn. At 0810 hours0.00938 days <br />0.225 hours <br />0.00134 weeks <br />3.08205e-4 months <br />, TS 3.1.3.5 and 3.0.3 were entered. At 11:07 hours, the Shutdown Bank "A" rods were withdrawn to 226 steps on the Group II demand counter using the normal rod withdrawal process, exiting TS 3.0.3 and TS 3.1.3.5.
The initiation of preparation for shutdown was completed within one hour of entering TS 3.0.3. Thus, BV1 initiated actions to shutdown the Unit, even though actual power level was not decreased.
Therefore, this event is reportable pursuant to 10 CFR 50.73(a)(2)(i)(B) as a condition prohibited by plant Technical Specifications as per NUREG-1022, Rev. 2, page 36. The cause of the Group II Shutdown Bank "A" control rods to fail to move as demanded was a degraded Slave Cycler Logic card inside the Rod Control Logic cabinet. The safety significance of this event was low. All control rods, including the Shutdown Banks, remained trippable throughout the event.
NRC FORM 366 (6-2004)
(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 (if more space is required, use additional copies of NRC Form 366A) anomaly that occurred on August 14, 2004 is considered to be low. This is based on the incremental core damage probability for the event when considering manual rod insertion to be unavailable during the time period.
Based on the above, the safety significance of the Shutdown Bank "A" Group 2 position anomaly on August 14, 2004 was low.
CORRECTIVE ACTIONS
- 1. An initial investigation determined that Shutdown Bank "A" Group I and 11 control rods had remained trippable.
- 2. A subsequent investigation identified that a failure in a Slave Cycler Logic card caused intermittent failure to move upon demand of Shutdown Bank "A", Group II. Following replacement of the failed Slave Cycler Logic card and the Master Cycler Selector Card, the surveillance test for SR 4.1.3.1.1 was performed successfully.
- 3. The Rod Control Preventive Maintenance frequency for both BVPS Units is being evaluated for optimal reliability.
- 4. Additional actions are being evaluated to address replacing obsolete Rod Control System cards with upgraded cards (as they become available) to help prevent age related card failures.
Completion of the above and other corrective actions are being tracked through the BVPS corrective action program.
PREVIOUS SIMILAR EVENTS
A review found no Beaver Valley Power Station Licensee Event Reports within the last three years involving control rod manual movement or control rod position indication.
COMMITMENTS
There are no new commitment made by FirstEnergy Nuclear Operating Company (FENOC) for BVPS Unit No. 1 in this document.