ULNRC-05309, Inoperable Channel 11 of the Loose Parts Detection System (Lpds)
| ML062090167 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/10/2006 |
| From: | Thibault L AmerenUE |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ULNRC-05309 | |
| Download: ML062090167 (5) | |
Text
AmerenUE PO Box 620 Callaway Plant Fulton, MO 65251 July 10, 2006 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-05309
- "Ameml Ladies and Gentlemen:
UE DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.
FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT Inoperable Channel 11 of the Loose Parts Detection System (LPDS)
Attached is a Special Report for the inoperability of Channel 11 of the Loose Parts Detection System (LPDS) in accordance with Final Safety Analysis Report Section 16.3.3.5 Action 'a'.
New commitments are identified in this correspondence. None of the material in this response is considered proprietary by Union Electric.
If you have any questions or require additional information, please contact Mr. Keith Mills, Supervisor, Regional Regulatory Affairs at 573/676-4317.
Sincerely, E. Thibault Director Plant Operations Enclosure
- 1) Special Report a subsidiary of Ameren Corporation
ULNRC-05309 July 10, 2006 Page 2 Mr. Bruce S. Mallett Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Jack N. Donohew (2 copies)
Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O-7D1 Washington, DC 20555-2738 Missouri Public Service Commission Governor Office Building 200 Madison Street PO Box 360 Jefferson City, MO 65102-0360 Mr. Ron Reynolds Director Missouri State Emergency Management Agency P.O. Box 116 Jefferson City, MO 65102
ULNRC-05309 July 10, 2006 Page 3 bcc:
C. D. Naslund A. C. Heflin K. D. Young G. A. Hughes D. E. Shafer (470)
S. L. Gallagher (100)
L. M. Belsky (NSRB)
K. A. Mills P. M. Bell T. A. Moser D. W. Griffith.
A160.0761 Certrec Corporation 4200 South Hulen, Suite 630 Fort Worth, TX 76109 (Cerirec receives ALL attachments as long as they are non-safeguards and public disclosed).
Send the following without attachments:
Ms. Diane M. Hooper Supervisor, Licensing WCNOC P.O. Box 411 Burlington, KS 66839 Mr. Scott Bauer Regulatory Affairs Palo Verde NGS P.O. Box 52034, Mail Station 7636 Phoenix, AZ 85072-2034 Mr. Scott Head Supervisor, Licensing South Texas Project NOC Mail Code N5014 P.O. Box 289 Wadsworth, TX 77483 Mr. Dennis Buschbaurn TXU Power Comanche Peak SES P.O. Box 1002 Glen Rose, TX 76043 Mr. Stan Ketelsen Manager, Regulatory Services Pacific Gas & Electric Mail Stop 104/5/536 P.O. Box 56 Avila Beach, CA 93424 Mr. John O1Neill Pillsbury Winthrop Shaw Pittman LLP 2300 N. Street N.W.
Washington, DC 20037
ULNRC-05309 July 10, 2006 Page 4 LIST OF COMMITMENTS The following table identifies those actions committed to by AmerenUE in this document. Any other statements in this document are provided for information purposes and are not considered commitments. Please direct questions regarding these commitments to Mr. Keith Mills, Supervisor, Regional Regulatory Affairs at 573/676-4317.
COMMITMENT Restoration of Loose Parts Monitoring System Channel 11 to Operable status Due Date/Event Prior to restart from Refuel 15 =1 Note: Refuel 15 is currently scheduled to start March 30, 2007.
ULNRC-05309 July 10, 2006 Page 1 of 1 ENCLOSURE Special Report The Loose-Part Detection System Limiting Condition for Operation (LCO) (Section 16.3.3.5 of the Final Safety Analysis Report) requires the loose-part detection system to be operable in Modes 1 and 2. With one or more Loose-Part Detection System channels inoperable for more than 30 days, LCO Action 'a' requires a Special Report to be submitted to the Commission within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel(s) to operable status.
On June 11, 2006, with the Unit in Mode 1, Channel 11 of the Loose-Part Detection System (LPDS) was declared inoperable. This is one of the two sensors that are mounted on the inlet plenum side of Steam Generator "D".
Cause of the malfunction:
The initial investigation has concluded that the channel degradation is likely associated with the channel accelerometer, hard-line cable, or connectors located inside the primary containment, as indicated by its signal drifting and low responses.
Plans for restoring the channel to Operable status:
The capability to detect loose metallic parts in the Reactor Coolant System has been retained with the remaining 10 operable channels. The redundant sensor on the Steam Generator "D" is operable. Therefore continued operation to Refuel 15 is acceptable.
A station Work Request has been written to repair Channel 11 of the LPDS. The repair and testing to return the channel to operable status will be scheduled for the next refueling outage (RFO 15), due to limited accessibility resulting from high radiation dose rates during normal plant operation. Refuel 15 is currently scheduled to begin on March 30, 2007.
Repairs will be completed prior to restart from Refuel 15.