ML041110928

Special Report 10 Meter Aspirator Failure Renders Primary Meteorological Tower 10M Temperature Indication Inoperable

ML041110928
Person / Time
Site:	Callaway
Issue date:	04/13/2004
From:	Witt W AmerenUE
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC04982
Download: ML041110928 (3)

Text

AmerenUE PO Box 620 Cal/away Plant Fulton, MO 65251 April 13, 2004 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC04982 viAmeren UT DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 10 METER ASPIRATOR FAILURE RENDERS PRIMARY METEOROLOGAL TOWER 10M TEMPERATURE INDICATION INOPERABLE.

Ladies and Gentlemen:

Enclosed is a Special Report documenting the Inoperability of 10 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 32)9 a subsidiaryof Ameren Corporation

ULNRC04982 April 13, 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

Enclosure:

ULNRC04982 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 8, 2004, with Callaway Plant in Mode I, the Primary Met Tower 10 Meter Aspirator was determined to be inoperable. The Aspirator forces air flow past the temperature sensor and without proper airflow, temperature indication is considered inaccurate and inoperable. As a result the Primary Met Tower 10 Meter Temperature Sensor RDTE500ICA was declared Inoperable which made the FSAR required IOM -

60M Air Temperature DeltaT instrumentation Inoperable. Further investigation indicated that the aspirator operation became suspect on 3/27/04, and the date of failure was considered 3/27/04.

Plans for restoration to Operable status:

A station Work Request was generated on 4/8/04 to correct the Inoperability situation.

On 4/10/04, the faulty Aspirator fan was replaced and a retest of the aspirator and temperature circuitry was successfully performed. At 1651, 4/10/04, the Primary Met Tower 10 Meter aspirator and Primary Met Tower 10 Meter temperature sensor were declared Operable.

Cause of the malfunction:

Observations of the faulted fan indicate that the fan bearing are degraded and that the damage is due to normal wear.