05000423/LER-2008-005, For Millstone Power Station, Unit 3 Regarding Containment Penetration Not Fully Closed During Fuel Movement
| ML090130383 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/30/2008 |
| From: | Jordan A Dominion, Dominion Nuclear Connecticut |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 08-0755 LER 08-005-00 | |
| Download: ML090130383 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 4232008005R00 - NRC Website | |
text
- Dominion Dominion Nuclear Connecticut, Inc.
Millstone Power Station Rope Ferry Road, Waterford, CT 06385 DEC 3 0 2008 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Serial No.
MPS Lic/TGC Docket No.
License No.
08-0755 RO 50-423 NPF-49 DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 3 LICENSEE EVENT REPORT 2008-005-00 CONTAINMENT PENETRATION NOT FULLY CLOSED DURING FUEL MOVEMENT This letter forwards Licensee Event Report (LER) 2008-005-00 documenting a condition discovered at Millstone Power Station Unit 3, on November 5, 2008. This LER is being submitted pursuant to 10 CFR 50.73(a)(2)(i)(B), as a condition prohibited by technical specifications.
If you have any questions or require additional information, please contact Mr. William D.
Bartron at (860) 444-4301.
Sincerely, A.J.
President - Millstone Attachments: 1 Commitments made in this letter: None
Serial No. 08-0755 Docket No. 50-423 Licensee Event Report 2008-005-00 Page 2 of 2 cc:
U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 Ms. C. J. Sanders Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08B3 Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station
Serial No. 08-0755 Docket No. 50-423 Licensee Event Report 2008-005-00 ATTACHMENT LICENSEE EVENT REPORT 2008-005-00 CONTAINMENT PENETRATION NOT FULLY CLOSED DURING FUEL MOVEMENT MILLSTONE POWER STATION UNIT 3 DOMINION NUCLEAR CONNECTICUT, INC.
Abstract
With the plant in Mode 6 at 0% power on November 5, 2008, operators discovered that a valve (3FWS*V861) relied upon to be closed to meet Technical Specification requirements during fuel movement in containment was not fully closed. Plant Technical Specification (TS) 3.9.4.c requires that each penetration providing direct access from the containment atmosphere to the outside atmosphere be closed by an isolation valve, blind flange, or manual valve or be capable of being closed under administrative control during movement of fuel within the containment building.
Valve 3FWS*V861 is a drain line isolation valve off the feedwater line to the "C" steam generator inside containment and was being credited as closed since a pathway to atmosphere outside containment existed due to maintenance activities on associated portions of the main steam system. The subsequent investigation determined that the valve had been in this condition during fuel movement inside containment that occurred from November 1, 2008 at 0430 until November 3, 2008 at 0915.
The cause of this condition was determined to be a combination of mechanical and physical factors making the valve difficult to operate to ensure full closure. The valve was subsequently closed. The valve will be inspected and repaired, as necessary, at the next appropriate opportunity.
Since the plant was in a configuration not allowed by the Technical Specifications, this event is reportable in accordance with 10 CFR 50.73(a)(2)(i)(B) as any operation or condition prohibited by the plant's Technical Specifications.
NRC FORM 366 (6-2004)
(If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17)
In this case, a pathway to atmosphere existed via a hose connected to a 2" valve (3FWS*V861), through the feedwater line to the secondary side of the "C" steam generator, through the main steam line and to atmosphere through an open main steam isolation valve drain standpipe low point drain (3DTM*V1 17). Since operators were not aware that 3FWS*V861 was not fully closed, no administrative controls were in place to ensure the penetration could be closed within 30 minutes. This condition existed from November 1, 2008 at 0430 until November 3, 2008 at 0915, the period of time in which fuel movement inside containment was underway. There was no fuel handling accident.
4. Corrective Action
Valve 3FWS*V861 and 3FWS*V862 were subsequently closed. The valves will be inspected and repaired, as necessary, at the next appropriate opportunity.
Additional corrective actions are being taken in accordance with the station's Corrective Action Program.
- 5.
Previous Occurrences
No previous similar events/conditions were identified.
Energy Industry Identification System (EIIS) codes are identified in the text as [XX].