ML052220385

Technical Specification (TS) 3.3.3.10 - Special Report 2005-01

ML052220385
Person / Time
Site:	Sequoyah
Issue date:	08/02/2005
From:	Pace P Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML052220385 (2)

Text

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Tennessee Valley Authority, Post Office Box 2000, Soddy-Daisy, Tennessee 37384-2000 August 2, 2005

-U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) - UNITS 1 AND 2 - FACILITY OPERATING LICENSE DPR-77 and DPR TECHNICAL SPECIFICATION (TS) 3.3.3.10 - SPECIAL REPORT 2005-01 The enclosed special report provides details concerning the waste gas analyzer.

The waste gas analyzer was inoperable for greater than 30-days. This report is being submitted in accordance with TS 3.3.3.1 0.

If you have any questions concerning this submittal, please telephone me at (423) 843-7170 or J. D. Smith at (423) 843-6672.

P. L. Pace Manager, Site Licensing and Industry Affairs

Enclosure:

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ENCLOSURE SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 and 2 SPECIAL REPORT 2005-01 Description of Condition On May 17, 2005, the waste disposal system waste gas analyzer was declared inoperable. The analyzer microprocessor controls appear to have failed. The analyzer would not properly display the data. On June 8, 2005, a modification was performed to install a temporary analyzer. On June 10, 2005, during calibration of the temporary analyzer, the analyzer could not be-calibrated. -The hydrogen and oxygen cells were regenerated to attempt to calibrate the analyzer. Additional trouble shooting was performed and it was determined that the hydrogen cell had to be rebuilt. Following the refurbishment of the hydrogen cell, the analyzer was calibrated and returned to service on June 22, 2005.

Cause of Condition The cause of the inoperable monitor was equipment failure. The cause of the failure to return the waste gas analyzer to service within 30 days was the unexpected failure of the hydrogen cell.

Immediate Actions In accordance with Technical Specification Limiting Condition for Operation 3.3.3.10 Action Statement (a), operation of the waste gas disposal system continued with grab samples taken and analyzed.