ML20008F984

First Interim Deficiency Rept,Initially Reported 810402,re Tornado Depressurization Design Deficiencies.Ventilation Analysis for Intake & Essential Raw Cooling Water Pumping Stations Performed.Next Rept Will Be Submitted by 810909

ML20008F984
Person / Time
Site:	Black Fox, Yellow Creek
Issue date:	05/04/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, YCRD-50-566-81, YCRD-50-567-81, NUDOCS 8105120443
Download: ML20008F984 (2)

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TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. 'ENNESSEE 374ot 400 Chestnut Street Tower II May 4, 1981 YCRD-50-566/81-13 YCRD-50-567/81-11 Aco

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. k7 Mr. James . O'Reilly, Director i l'I4Yl JJgg 4 Office of spection and Enforcement ,

47' ;' u.3, %codsDs gh U.S. Nuclear 'egulatory Commission <N Region II - Su e 2100 h /g 101 Marietta Str t Atlanta, Georgia 0303 hpl ru

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Dear Mr. O'Reilly:

YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 - TORNADO IEPRESSURIZATION DESIGN DEFICIENCIES - YCRD-50-566/81-13, YCRD-50-567/81 11 - FIRST IlfrERIM REPORT The subject deficiency was initially reported to NRC-0IE' Inspector i

R. V. Crlenjak on April 2,1981, in accordance with 10 CFR 50.55(e) as

! NCR YCN CDB 8101. Enclosed is our first interim report. We expect to submit our next report by September 9, 1981.

If you have any questions concerni.4 this matter, please get in touch with i D. L. Lambert at FTS 857-2581.

Very truly yours, l

. TENNESSEE VALLEY AUTHORITT L. M. Mills, Manager Nuclear Regulation and Safety i Enclosure l cc: It'. Victor Stello, Jr., Director (Enclosure) l Office of Inspection and Enforcement -

U.S. Nuclear Regulatory Commiission Washington, DC 2C555 Bol?

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ENCLOSURE S .

YELLOW CPIEK NUCLEAR PLANT UNITS 1 AND 2 TORNADO DEPRESSURIZATION DESIGN DEFICIENCIES YCRD-50-566/81-13, YCRD-50-567/81-11 10 CFR 50.55(e)

FIRST INTERIM REPORT Description of Deficiency While reviewing the tornado design of safety-related structures, design engineers discovered a discrepancy between drawings and design criteria for the Yellow Creek Nuclear Plant's Intake Pumping Station and ERCW Pumping Station concrete structures. Final structural design for these structures was co=pleted in accordance with applicable design criteria (N8-9J-D701 and N8-K2-D701) that specify depressurization of the structures during a tornado. Construction drawings (8IE0311-K2 series and 8KE0320-K2 series) were issued, but all parts of these structures were not vented sufficiently to ensure depressurization. Civil and mechanical engineers reviewing these drawings failed to ensure venting in accordance with the design criteria.

The deficiency does not extend to other structures at this er other nuclear plants. ,

Correctxve Action A ventilation analysis for the Intake Pumping Station and the ERCW Pumping Staticn is being performed. Additional vents will be provided and drawings ,,

" will be revised to show these vents. The structure will be designed to resist any differential pressures identified by the ventilation analysis.

All analysis and drawing revisions are expected to be completed by August 1, 1981.

All engineers checking and reviewing final design calculations will be instructed to verify that all requirements of the design criteria are met and that drawings are consistent with the calculaticns.

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