ML20203J060

Recommends That Directorate of Licensing Take Lead Responsibility in Reviewing Safety Aspects of Vibrations in Torus & torus-ring Header During Relief Valve Operation. Licensee Stated Concern Re long-term Effects on Torus Walls

ML20203J060
Person / Time
Site:	05000000, Browns Ferry
Issue date:	12/28/1973
From:	Grier B US ATOMIC ENERGY COMMISSION (AEC)
To:	Moore V US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML082390329	List: IR 05000259/1973002 IR 05000259/1973003 IR 05000259/1973004 IR 05000259/1973007 IR 05000259/1973012 IR 05000259/1973013 IR 05000259/1973014 IR 05000259/1973016 IR 05000259/1974001 IR 05000259/1974002 IR 05000259/1974003 IR 05000259/1974005 IR 05000259/1974006 IR 05000259/1974010 ML20203H958 ML20203H963 ML20203H983 ML20203J022 ML20203J036 ML20203J054 ML20203J060 ML20203J070 ML20203J081 ML20203J091 ML20203J096 ML20203J116 ML20203J130 ML20203J397 ML20203J402 ML20203J406 ML20203J449 ML20203J484 ML20203J495 ML20203J644 ML20203J651 ML20203J739 ML20203J755 ML20203J773 ML20203J822 ML20203J827 ML20203J839 ML20203J842 ML20203J869 ML20203J928 ML20203J943 ML20203J964 ML20203J987 ML20203K091 ML20203K172 ML20203K188 ... further results
References
FOIA-85-782 RO-C&O-73-21, NUDOCS 8604300093
Download: ML20203J060 (2)

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IRANSFER OF LEAD RESPONSIBILITK' DEC 2 8 1973 Date:

Serial No.:

R0-C&O-73-21 R:

Voss A. Moore, Assistant Director for Boiling Water Reactors, L Subj ect:

Vibrations in the Torus and Torus-Ring Header During Relief Valve Operation Facility: Tennessee Valley Authority, Browns Ferry Nuclear Plant Units 1, 2 and 3 Responsible R0 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 deflection of the torus walls and torus-ring header. The licensee characterized the measured data as "more than desirable, but within the range predicted by General Electric Company." TVA has calculated critical stress 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 effects on the torus wall.

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

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References:

1.

TVA - Browns Ferry 1, Abnormal Occurrence Reports,BFAO 7343W dated November 28, 1973 and Interim Report dated Deccnoer 16, 1973.

2.

Transfer of Lead Responsibility No. R0-C&O-8, dated October 18, 1973, Target Rock Safety Relief Valves.

3.

NEDO 10859, Steam Vent Clearing Phenomena and Structural Responce of the BWR Torus.

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TRANSFER OF LEAD RESPONSIBILITY DEC 2 8 1973 30 Recommendations and Proposed Course of Action:

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

Concurrences:

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