ML20210A454
| ML20210A454 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, 05000000 |
| Issue date: | 04/28/1987 |
| From: | Gilland J, Sessions K TENNESSEE VALLEY AUTHORITY |
| To: | Moore V US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20209J032 | List:
|
| References | |
| FOIA-87-40 370, NUDOCS 8705050089 | |
| Download: ML20210A454 (9) | |
Text
{{#Wiki_filter:" TENNESSEE VALLEY AUTHO AITY F 3 CHAi s ANCOGA, TENNESEEE - g 37401 . .! .1 (kb? n A ANNIVE Ash ~AY
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Yi$ Mr. Voss A. Moore, Assistant Director , Yx g , Y for Boiling Water Reactors . Directorate of Licensing '
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U.S. Atomic Energy Commission J .7/ Washington, DC 20545
Dear Mr. Moore:
In the Matter of the Applications of ) Docket Nos. 50-259 of Tennessee Valley Authority ) 50-260 j, 50-296 In a telephone conversation on January 3, 1974, F. J. Williams of your staf f notified us that the responsibility for the Browns Ferry Nuclear Plant torus problem had been transferred from the . Directorate of Regulatory Operations to the Directorate of Licensing. l Further, he asked that a call be arranged whereby he could obtain l more information about the problem. Consequently, on January 4, ' 1974, a telephone conversation was held among J. F. Stolz and F. J. Williams of your staff and R. H. Davidson, R. C. Steffy, i C. O. Thomas, and W. L. Byrd of our Nuclear Engineering Branch. ; During that conversation, R. H. Davidson described the history and . present status of the problem and steps being taken to alleviate g the problem. This letter is in response to J. F. Stolz's request [ that we document for you the most essential elements of that conver- t sation. A drawing of the torus and torus ring header is presented as Enclosure e
- 1. The torus ring header is 30 inches in diameter and circumscribes the torus at elevation 525 feet 4 inches. Four 30-inch penetration nozzels connect the ring header to the torus. The ring header is now supported by brackets attached to the 16 cradles as shown in Enclosure 2.
The details concerning the vibrations observed in the torus and torus ring header upon the opening of relief valves during startup testing at unit 1 of the Browns Ferry Nuclear Plant are described g I .* r M 9 870428 THOMAsB7-40 PDR j;
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Vosa A. Moore in a letter dated November 28, 1973, from E. F. Thomas to J. F. O' Leary enclosing Abnormal Occurrence Report BFAO-7343W. An interim report on the testing and work performed to alleviate the problem as of - December 17, 1973, was pro,vided in a letter bearing that date from E. F. Thomas to J. F. O' Leary. Subsequent to December 17, 1973, the torus was raised and stainless steel shims were placed between most of the torus feet and base plates to equalize more nearly the load on each of the feet. Also, the three relief valve tail pipes with ram's head terminations were shortened to approximately four feet from the bottom of the torus shell. Vibration and stress measuring instrumentation was installed. Test plans and acceptance criteria were developed jointly by GE and TVA, and a gradual sequence of tests is now underway to determine the effectiveness of the modifications. TVA's Nuclear Safety Review Board has reviewed the test plans and acceptance criteria and, based on the limiting conditions and power level restrictions specified in the test procedure, agreed that the p tests could be conducted safely. It also has been determined that the written instructions and available systems would assure that the reactor could be shut down and maintained in a safe shutdown condition at any time during the tests. A detailed report will be provided upon completion of the testing program. . Very truly yours, J. E. Gilleland Assistant to the Manager of Power - Enclosures , CC (Enclosures): Mr. R. R. Barris Mr. K. L. Sessions General Electric Company General Electric Company 832 Georgia Avenue 9040 Executive Park Drive Chattanooga, TN 37402 Knoxville, TN 37919 Mr. R. B. Beers TVA Projects . General Electric Company [ Atomic Power Equipment Department ' San Jose, California 95125 9
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