ML20010G913

Second Interim Deficiency Rept Re Tornado Depressurization Design,Initially Reported on 810402.Ventilation Analysis for Essential Raw Cooling Water Pumping Station Complete.Final Documentation in Progress.Next Rept Expected 820127

ML20010G913
Person / Time
Site:	Yellow Creek
Issue date:	09/09/1981
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, NUDOCS 8109220655
Download: ML20010G913 (2)

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 -    -                         TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II september 9, 1981                             -

YCRD-50-566/81-13 -o a YCRD-50-567/81-11 g -$ 0  ;, 7 __ Mr. James P. O'Reilly, Director e3 . Office of Inspection and Enforcement .. y, U.S. Nuclear Regulatory Commission o> . Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303

Dear Mr. O'Reilly:

YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 - TORNADO DEPRESSURIZATION DESIGN DEFICIENCIES - YCRD-50-566/81-13, YCRD-50-567/81 SECOND INTERIM REPORT The subject deficiency was initia?.ly reported to NRC-0IE Inspector R. V. Crlenjak on April 2, 1981, in accordance with 10 CFR 50.55(e) as NCR YCN CDB 8101. This ma followed by our first interim report dated May 4, 1981. Enclosed is our second interim report. We expect to submit our next report by January 27, 1982. If you have any questions concerning this matter, please get in touch D. L. Lambert at FTS 857-2581. ' Very truly yours, (q}tJ F} 1\ j TENNESSEE VALLEY AITfHORI SEP 2 21981~ [ u C u.s. gMcI# )

                                                          . M. Mills, Manager        /
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Nuclear Regulation and Safet hy \ Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure) T O-g Office of Inspection and Enforcentent S U.S. Nuclear Regulatory Commission / Washington, DC 20555 [/( H109220655 810909 PDR ADOCK 05000566 S PDR An Equal Opportunity Employer

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ENCLOSURE d

) YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 TORNADO DEPRESSURIZATION DESIGN DEFICIENCIES 1 -YCRD-50-566/81-13, YCRD-50-567/81-11

• 10 CFR 50.55(e) _4 t

SECOND INTERIM REPORT Description of Deficiency While reviewing the tornado desQ.1 of safety-related structures, < design engineers discovered a' discrepancy between drawings and design ! criteria for the Yellow Creek huolear Plant's Intake Pumping Station 1- - and ERCW Pumping Station concrete structures. Final structural design  : for these structures was completed in accordance with ~ applicable 1 - design criteria (N8-9J-D701 and N8-K2-D701)'that specify' - j depressurization of. the structures during a tornado. . Construction'

                ,                            drawings (8IE0311-K2. series and 8KE0320-K2 series) were issued, but

^ I 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. i The deficiency does not extend to e' ar structures at this or other

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;-                                          : nuclear plants.

Interim Progress The ventilation analysis for the ERCW Pumping Station is complete.

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}-' Final documentation of assumptions relative-to the ventilation !' analysis is in progress. ! Because of the recent addition of a room to the ' Intake Pumping Station, another ventilation analysis will be required for this structure. All work !- is . expected to _be completed and the results ' included in the final report. J I". f1 ?

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