ML19339A511
| ML19339A511 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/30/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8011040164 | |
| Download: ML19339A511 (2) | |
Text
_ _ _
TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 37401 2
100 Chestnut Street Iower II 4
D D
j hr. Harold R. Dentor., Director Office of huolear Reactor Regulatica U.S. kuolear Regulatory Commission Washington, DC 20355
Dear Mr. Denton:
In the Matter of
)
Docket No. 50-327 Tennessee Valley Authority
)
TVA has installed the Ir.terim Distributed Ignition System (IDIS) for unit 1 of the Sequoyah Euclear Flant as described in the TVA report, submitted by my letter to you dated September 2, 1980. The IDIS has been designed to be operational by manual actions in the auxiliary building very rapidly.
Preliminary operational procedures for the use of the IDIS have beer.
completed. TVA's initial testing cf effectiveness and of reliability of the igniter assembly has been completed. The test results at the Penwal facility provide assurance that the IEIS will rellat.ly burn hydrogen in the 6 to 12 volume percent range and that er.vironmental conditione of pressure, temperature, humidity, and air flow across the igniter have little or no effect on system burning efficiency. The Singleton Laboratory testing for endurance continues, and these tests have shown that the glow plugs will be a reliable oomponent in the IDIS system. The preoperational testing of each igniter gives additional confidence that the system is effective and dumble.
In the period before final review and approval of the IDIS by NRC, TVA con-siders that the IDIS for Sequoyah unit 1 is now an available option for use j
if protection was required for any extraordinary event which generated a sufficient quantity of hydrogen to threaten breach of the containment. We assume, based on the information gathered to date, the NRC would support the use of this system; and, therefore, TVA would pursue this option should an emergency of this nature develop.
TVA, Duke, AEP, and Westinghouse are in the process of finalizing the last series of tests at the Fenwal facility. This it:rther testing will examine the operability of the igniter under various conditions as well as looking at the effects of the post-burn environment on anterials. The available An Equal Opportunity Employer
_ _ _ _ _ _ _. _ _ _ - - _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ October 30, 1980 Mr. Harold R. Denton, Director remalts and the status of all testing will be provided in our quarterly report on tbs TVA research program on hydroge" control and effects of The first quarterly rep >rt will be submitted by hydrogen buming.
A test report on the Fenwal and Singleton tests to December 16, 1980.
this date will be submitted before November 14, 1980.
Very truly yours, TENNESSEE VALLEY AUTHORITY
. M. Mills, Na er Nuclear Regulation and Safety Sworn to subasribed before se this$d day of b. 1960
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d-My Commission Expins
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