ML20085M631

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Documents 740104 Telcon Re Actions Taken to Alleviate Vibrations in Torus & Torus Ring Header Described in AO BFAO-7343W.Vibration & Stress Measuring Instrumentation Installed.Drawings & Transfer of Responsibility Encl
ML20085M631
Person / Time
Site: Browns Ferry  
Issue date: 01/14/1974
From: Gilleland J
TENNESSEE VALLEY AUTHORITY
To: Moore V
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085M634 List:
References
NUDOCS 8311090107
Download: ML20085M631 (7)
v • d • e


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TENNESSEE VALLEY AUTHO AITY L"~'3 CHAa i ANCOGA, TENNESSEE

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W Mr. Voss A. Moore, Assistant Directorro tu-for Boiling Water Reactors 4y g[Z 2/

Directorate of Licensing y,,

s Office of Regulations

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T U.S. Atomic Energy Commission Washington, DC 20545

Dear Mr. Moore:

In the Matter of the Applications of )

Docket Nos. 50-259

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of Tennessee Valley Authority

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50-260 4-50-296 m

in a telephone conversation ca January 3, 1974, F. J. Williams of your staff 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.

Further, he asked that a call be arranged whereby he could obtain more information about the problem.

Consequently, on January 4, 1974, a tele. phone conversation was held among J. F. Stolz and F. J. Williams of your staff and R. H. Davidson, R. C. Steffy, C. O. Thomas, and W. L. Byrd of our Nuclear Engineering Branch.

During that conversation, R. H. Davidson described the history and

,t present status of the problem and steps being taken to alleviate 3

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 s ation.

}l' A drawing of the torus and torus ring header is presented as Enclosure l.

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 l

now supported by brackets attached to the 16 cradles as shown in 1.

The details concerning the vibrations observed in the torus and

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torus ring header upcn the opening of relief valves during startup testing at unit 1 of the Browns Ferry Nuclear Plant are described 4.

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r 8311090107 740114 h-h#f" i

gDRADOCK 05000259 pfl l1 (1

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' Voss A. Moore

,E in a letter dated November 28, 1973, from E. F. Thomas to J. F. O' Leary i

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 provided 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 CE and TVA, and a gradual sequence of tests is now underway to determine the effectiveness of the modifications.

TVA's Nucicar Safety Review Board has reviewed the test plans and y

acceptance criteria and, based on the limiting conditions and power Icvel restrictions specified in the test procedure, agreed that the i'

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, f

J. E. Gilleland Assistesnt to the Manager of Power s.

..f Enclosures f

CC (Enclosures):

Mr. R. R. Barris Mr. K. L. Sessions General Electric Company General Electric Company f4.

832 Georgia Avenue 9040 Executive Park Drive P

Chattanooga, TN 37402 Knoxville, TN 37919

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4 Mr. R. B. Beers TVA Projects jj Ceneral Electric Company p'.

Atomic Power Equipment Department S-San Jose, California 95125 S4 k

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F TRANSFER OF LEAD RESPONSIL_.ITY lt-h Date:

DEC 2 8 1973 i

Serial No.: R0-C60-73-21 i

R:

Vosa A. Moore, Assistant Director for Boiling Water Reactors, L

Subject:

Vibrations in the Torus and Torus-Ring Header During Relief

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Valve Operation s

I Facility: Tennessee Valley Authority, Browns Ferry Nuclear Plant I

Units 1, 2 and 3

(

Responsible RO Assistant Director:

B. H. Grier Description of Item Requiring Resolution:

During testing of relief valves at the Browns Ferry 1 facility, vibrations were noted in the vicinity of the torus. As a result, special instrumentation was installed to measure the acceleration and deflectica of the torus walls and torus-ring header. The licensee characterized the measured data as "more than desirabic, but within the range predicted by General Electric Company." TVA has calculated critical strees points on the torus and concluded that the stresses occurring during relief valve operation are within the allowable range.

However, the licensee has stated a concern for the long-term fatigue j

effects on the torus wall.

I t

TVA and other licensees have recently made modifications to their Target Rock relief valves to increase the opening response time. This is of possibic significance, in that General Electric has shown during studies made on Quad Cities 1 torus (Reference 3)-that more rapid opening times for these valves result in higher tranaient pressures at their point of discharge into the torus.

References:

1 l

l 1.

TVA - Browns Ferry 1. Abnormal Occurrence Reports BFAO 7343W dated j

November 28, 1973 and Interim Report dated December 16, 1973.

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Transfer of Lead Responsibility No. RO-C&O-8, dated October 18, j

1973, Target Rock Safety Relief Valves.

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NEDO 10859, Steam Vent Clearing Phenomena and Structural Response l

of the BWR Totus.

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TRANSFER OF LEAD RESPONSIBILITY DEC 2 8 1973 i

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RO Recommendations and Proposed Course of Action:

l It is recommended that the Directorate of Licensing take the lead responsibility in reviewing the safety aspects of this matter.

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Concurrences:

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Date Voss A. Moore, Assistant Director for Boiling Water Reactors, L W rs?,-

k w.'.,l l ? b fi 0 B.[.Gri(r,AssistantDirectorforConstruction& Operation,R0 D, ate d

cc:

D. F. Knuth, RO i

A. Giambusso, L I

J. G. Davis, R0

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J. M. Hendric, L D. J. Skovholt, L j

l J. B. Henderson, RO G. W. Reinmuth, RO I

R. J. McDermott, RO i

H. D. Thornburg, RO l

N. C. Moseley, RO:II l

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