ML041320379

Special Report for Callaway Plant Unit 1 Regarding Inoperability of 60 Meter Meteorological Monitoring Instrumentation on the Primary Meteorological Tower

ML041320379
Person / Time
Site:	Callaway
Issue date:	05/03/2004
From:	Witt W AmerenUE
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC04992
Download: ML041320379 (3)

Text

AmerenUE PO Box 620 Callaway PRant Fulton, MO 65251 May 3, 2004 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop PI-137 Washington, DC 20555-0001 ULNRC04992 i'wAmeren UE DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT METEOROLOGAL TOWER 60M WIND DIRECTION INDICATION INOPERABLE Ladies and Gentlemen:

Enclosed is a Special Report documenting the Inoperability of 60 Meter Meteorological Monitoring Instrumentation on the Primary Meteorological Tower in accordance with Final Safety Analysis Report 16.3.3.3, and the actions taken to restore this circuitry to an Operable status.

If you have any questions or require additional information, please contact Mr. Mark Reidmeyer, Supervisor, Regional Regulatory Affairs at (573) 676-4306.

Sincerely, Warren A. Witt Manager Callaway Plant Enclosure pu2 r a subsidiary ofAmeren Corporation

ULNRC04992 May 3, 2004 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. Jerry B. Uhlmann Director Missouri State Emergency Management Agency P.O. Box 116 Jefferson City, MO 65102

ULNRC04992 May 3, 2004 Enclosure ENCLOSURE Special Report The Meteorological Instrumentation Limiting Condition For Operation (LCO)

(Section 16.3.3.3 of FSAR) requires the meteorological monitoring instrumentation channels to be operable at all times. With one or more required meteorological monitoring channels inoperable for more than 7 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 an operable status.

On April 23, 2004, Callaway Plant was informed by a contract meteorologist that there was an offset of approximately 21 degrees in the primary met tower 60 meter wind direction instrumentation. As a result, the primary met tower 60 meter wind direction transmitter, RDZT5000B, was declared inoperable. Further investigation indicated that the transmitter operation became suspect on March 12, 2004. Therefore March 12, 2004, was established as the date of failure.

The plant shutdown for refueling on April 10, 2004. At the time of discovery there was no fuel in the reactor (No Mode conditions).

Plans for restoration to Operable status:

A station work request was generated on April 23, 2004 to repair the transmitter. On April 25, 2004, the transmitter was replaced and a retest of the transmitter circuitry was successfully performed. At 1318, April 26, 2004, the Primary Met Tower 60 Meter wind direction sensor was declared Operable. On April 28, 2004 the contract meteorologist confirmed that wind direction data plot was fine after the repair.

Cause of the malfunction:

On March 12, 2004, the 60 Meter Wind Direction loop was calibrated. During the calibration, the transmitter was removed from the tower. All AS FOUND values were in tolerance. Upon re-installation on the tower and restoration of the loop, it appears the transmitter was damaged and created an offset. The damage was not noted by the technicians. Observations of the faulted transmitter indicate that it had a zero shift and the transmitter potentiometer showed signs of non-linear span shift.