ML20085M744

Interim Deficiency Rept on Design Deficiency in Control Logic of HPCI & RCIC Sys.Initially Reported on 731110. Analysis Continuing.Final Rept Will Be Submitted by 740110

ML20085M744
Person / Time
Site:	Browns Ferry, 05000000
Issue date:	12/10/1973
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Kruesi F US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085M697	List: ML20085M723 ML20085M729 ML20085M744 ML20085M751
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8311090192
Download: ML20085M744 (1)

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TENNESSEE VALLE CH ATTANOOGA, "ENNESSEE U T H O AIT Y "~~ M 7 '

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ANNIVF EiL',A RY December 10, 1973 os m am.c m

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PA A T N r_ n S H a r) p2 * .

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- y,4; . .- . 8 Mr. F. E. Kruesi, Director 3.(S' N'h Directorate of Regulatory Operations U.S. Atomic Energy Cornmission .'.c $up " N.

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Dear Mr. Kruesi:

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.' S 5NilC In conformance with paragraph 50.55(e) of 10 CFR 50, this k,h-[.

(;3t is submitted as an interim report on a design deficiency ft;g,4 in the control logic of HPCI and RCIC systems of our Mfy Q':.;

Browns Ferry Nuclear Plant units 2 and 3. Initial report i

of this deficiency was made to AEC-DRO Region II on Q: m ' Q' November 10, 1973. Had this deficiency not been discovered, 74 ' c ' '

a complete loss of plant electrical power would have caused kNf l

the HPCl and RCIC to be inoperable until manally reset. '<

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, We are continuing to analyze the safety implications .

1 associated with thie problem and we are making design changes } ft 'gg~

?gG'rf to these control systems. We will supply a final report

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on this problem to you by January 10, 1974.

kt? T; Very truly yours, $)b.@..

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J. E. Gilleland k Assistant to the Manager of Power j[j$.n?$

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CC: Mr. Norman C. Moseley, Director _A?fh i

Directorate of Regulatory Operations i~ .'%

U.S. Atomic Energy Commission Region II - Suite 818 230 Peachtree Street, NW.

Atlanta, Georgia 30303 l

8311090192 730725 PDR ADOCK 05000259

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