ULNRC-05187, Inoperable Channel 3 of the Loose Parts Detection System (Lpds)

Inoperable Channel 3 of the Loose Parts Detection System (Lpds)

ML052380373
Person / Time
Site:	Callaway
Issue date:	08/11/2005
From:	Younie C AmerenUE, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-05187
Download: ML052380373 (5)

Text

AmerenUE PO Box 620 Callaway Plant Fulton, MO 65251 August 11, 2005 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop PI -137 Washington, DC 20555-0001 ULNRC-05187 w'Ameren Ladies and Gentlemen:

AE DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT Inorperablc Channel 3 of the Loose Parts Detection System (LPDS)

Attached please find a Special Report for the inoperability of Channel 3 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. Mark Reidmeyer, Supervisor, Regional Regulatory Affairs at 573/676-4306.

Sincerely, Chris R. Younie Manager, Callaway Plant Enclosure Enclosure(s) 1) Special Report

2) List of Commitments a subsidiary of Ameren Corporation

ULNRC05187 August 11, 2005 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 7E1 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

08/28/2005 04:44 FAX 6764202 0 004/006 ULNRC05 187 August 11, 2005 Page 3 bce: C. D. Naslund C. R. Younie K, D. Young.

G. A. Hughes D. E. Shafer (470) (2 copies)

S. L. Gallagher (100)

S. L. Klang (NSRB)

M. A. Reidmeyer E. W. Henson A160.0761 Ms. Diane M. Hooper Mr. Dennis Buschbaumr Supervisor, Licensing TXU Power WCNOC Comanche Peak SES P.O. Box 411 P.O. Box 1002 Burlington, KS 66839 Glen Rose, TX 76043 Mr. Scott Bauer Mr. Stan Ketelsen Regulatory Affairs Manager, Regulatory Services Palo Verde NOS Pacific Gas & Electric P.O. Box 52034, Mail Stop 104/5/536 Mail Station 7636 P.O. Box 56 Phoenix, AZ 85072-2034 Avila Beach, CA 93424 Mr. Scott Head Certrec Corporation Supervisor, Licensing 4200 South Hulen, Suite 630 South Texas Project NOC Fort Worth, TX 76109 Mail Code N5014 P.O. Box 289 (Certrecreceives ALL Wadsworth, TX 77483 attachments as long as they are non-safeguardsand public disclosed).

.,r. John O'Neill Shaw, Pittman 2300 N. Street N.W.

Washington, DC 20037

ULNRC05187 August 11, 2005 Page 4 ENCLOSURE Ameren UE Callaway Plant 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 I 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 19, 2005, with the Unit in Mode 1, Channel 3 of the Loose-Part Detection System (LPDS) vibration channel locked in constant alarm. Note that each channel includes a vibration range and a loose part range. Only the loose part range is required for channel alarm operability and the loose part range was not in alarm. This channel is one of two sensors mounted in the upper vessel region. LPDS Channel 3 indications were evaluated and it was determined that the loose part range indications were operable. On July 6, 2005, a sporadic cable fault indication on Channel 3 began occurring. On August 5, 2005, Channel 3 background noise indication had increased such that the ability to detect an actual loose part was questionable. It was decided to conservatively declare LPDS Channel 3 inoperable since July 6, 2005 when the first cable fault indication was received.

Cause of the malfunction:

The initial investigation has concluded that the failure is likely associated with the channel components or cable connections located inside the primary containment, as indicated by the channel's excessive noise and a constant hum on its audio output.

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 11 operable channels. The redundant sensor on the upper vessel region is operable. Therefore continued operation to Refuel 14 is acceptable.

A station Work Request has been written to repair Channel 3 of the LPDS. The repair and testing to return the channel to operable status will be scheduled for the next refueling outage (RF1014), due to limited accessibility resulting from high radiation dose rates during normal plant operation. Refuel 14 is currently scheduled to begin on September 17, 2005.

Repairs wvill be completed prior to restart from Refuel 14.

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:

I COMMITMENT I Duc Datc/Evcnt I Restoration of Loose Parts Monitoring System Channel 3 to Prior to restart I Operable status from Refuel 14 Note: Refuel 14 is currently scheduled to start September 17, 2005.