05000324/LER-2002-001, From Brunswick Steam Electric Plant Unit 2 Regarding Instrumentation Malfunction Results in Loss of Safety Function for High Pressure Coolant Injection System
| ML023600433 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 12/23/2002 |
| From: | Noll W Carolina Power & Light Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BSEP-02-0183 LER 02-001-00 | |
| Download: ML023600433 (7) | |
| Event date: | |
|---|---|
| Report date: | |
| 3242002001R00 - NRC Website | |
text
Ci CP&L A Progress Energy Company DEC 2 3 2002 SERIAL: BSEP 02-0183 10 CFR 50.73 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-324/LICENSE NO. DPR-62 LICENSEE EVENT REPORT 2-02-001 Gentlemen:
In accordance with the Code of Federal Regulations, Title 10, Part 50.73, Carolina Power
& Light Company submits the enclosed Licensee Event Report. This report fulfills the requirement for a written report within sixty (60) days of a reportable occurrence.
Please refer any questions regarding this submittal to Mr. Edward T. O'Neil, Manager - Support Services, at (910) 457-3512.
Sincerely, W. G. Noll Plant General Manager Brunswick Steam Electric Plant CRE/cre Enclosure: Licensee Event Report Brunswick Nuclear Plant P0 Box 10429 Southport, NC 2B461
Document Control Desk BSEP 02-0183 / Page 2 cc (with enclosure):
U. S. Nuclear Regulatory Commission, Region II ATTN: Mr. Luis A. Reyes, Regional Administrator Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, GA 30303-8931 U. S. Nuclear Regulatory Commission ATTN: Mr. Theodore A. Easlick, NRC Senior Resident Inspector 8470 River Road Southport, NC 28461-8869 U. S. Nuclear Regulatory Commission ATTN: Ms. Brenda L. Mozafari (Mail Stop OWFN 8G9) (Electronic Copy Only) 11555 Rockville Pike Rockville, MD 20852-2738 U. S. Nuclear Regulatory Commission ATTN: Mr. Leonard N. Olshan (Mail Stop OWFN 8H12) (Electronic Copy Only) 11555 Rockville Pike Rockville, MD 20852-2738 U. S. Nuclear Regulatory Commission ATTN: Mr. Allen G. Howe (Mail Stop OWFN 8G9) (Electronic Copy Only) 11555 Rockville Pike Rockville, MD 20852-2738 Ms. Jo A. Sanford Chair - North Carolina Utilities Commission P.O. Box 29510 Raleigh, NC 27626-051
Abstract
On November 1, 2002, at approximately 1641 hours0.019 days <br />0.456 hours <br />0.00271 weeks <br />6.244005e-4 months <br />, a Unit 2 High Pressure Coolant Injection (HPCI) Steam Line Flow - High analog trip unit (Rosemount Model 51ODU7AO10) malfunction resulted in a HPCI Steam Supply Outboard Isolation valve closure and HPCI system inoperability. The plant responded as designed to the event. Plant operators entered the appropriate Technical Specification Limiting Conditions for Operation and the trip unit was replaced. By November 2, 2002, at 0542 hours0.00627 days <br />0.151 hours <br />8.96164e-4 weeks <br />2.06231e-4 months <br />, the HPCI system was returned to service and declared operable. The safety significance of this occurrence is considered minimal.
The cause of the HPCI system isolation and inoperability is attributed to the spurious actuation of the analog trip unit due to the malfunction of the output transistor.
Further testing and evaluation is in progress to better understand the failure mode and establish appropriate action thresholds. The special process procedure for monitoring analog trip unit output voltages will be revised to incorporate the updated thresholds. The scope of analog trip unit and/or output transistor replacement activities will then be determined and corrective actions initiated as appropriate.
NRC FORM 366 (7-2001)
(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) (17)
COMMITMENTS
Those actions committed to by Carolina Power & Light (CP&L) Company in this document are identified below. Any other actions discussed in this submittal represent intended or planned actions by CP&L. They are described for the NRC's information and are not regulatory commitments. Please notify the Manager - Support Services at BSEP of any questions regarding this document or any associated regulatory
commitments
- By February 22, 2003, OSPP-ETUOO will be revised to include the results of the ongoing testing and evaluations to determine appropriate output voltage thresholds and scope of monitoring.
- By March 4, 2003, the scope of analog trip unit and/or output transistor replacement activities will be determined and corrective actions initiated as appropriate.