ML20011A988

Final Deficiency Rept Re Engineer Failure to Verify Preliminary Seismic Analyses Prior to Final Design Completion Initially Reported 810212.Final Evaluations Reveal That No Design Changes Are Required

ML20011A988
Person / Time
Site:	Yellow Creek
Issue date:	10/23/1981
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 8111030473
Download: ML20011A988 (3)

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TENNESSEE. VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374 JSNRC REGION :

400 Chestnut Street Tower IIl.tiNTAf GEORGM October 23, 1981 YCRD-50-566/81-04 8100127 Pl2 : 12

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Mr. James P. O'Reilly, Director

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Dear Mr. O'Reilly:

YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 - UNVERIFIED SEISMIC ANALYSIS FOR FINAL DESIGN - YCRD-50-566/81-04, YCRD-50-567/81 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspcotor R. W. Wright on February 12, 1981, in accordance with 10'CFR 50.55(e) as NCR YCN YCP 8101. This was followed b; our interim reports dated March 13.and July 17, 1981. Enclosed is our final report..

If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 857-2581.

Very truly yours, TENNESSEE VALLEY AUTHCRITY l

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g j L. M. Mil s, Manager

/V Nuclear R lation and S fe y i

Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Tbs

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1 ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2.

UNVERIFIED SEISMIC ANALYSIS FOR FINAL DESIGN YCRD-50-566/81-04, YCRD-50-567/81-03 10 CFR 50.55(e)

FINAL REPORT Description of Deficiency During review of design drawings, it was discovered that final design had been completed and construction drawings issued based on preliminary seismic analyses. The nonconforming condilion occurred for the essential raw cooling water (ERCW) pumping station, equipment hatch access' platform, and waste management building. Engineers failed to observe the seismic input had not been verified. -

Safety Implicaticns '

Since the verification of the preliminary seismic analyses (discussed in corrective actione) has shown that no changes are required, use of the preliminary information would not have jeopardized the above-mentioned structures. The efore, the safe operation of the plant would not have been adversely affecteu.

Corrective Action .

TVA has completed the final seismic analyses for the structures in question. An evaluation of the final seismic loads on the structures has been completed with no changes required to the original dt .ign. The requirement of having final seismic analysis before completion or construction drawings has been reemphasized to engineers and designers by appropriate TVA management. Other TVA nuclear plants are not affected.by this nonconformance. The following is a summary of the corrective action taken on each structure in question and the dates when the action was completed.

1. Essential Raw Cooling Hater Pumping Station The final seismic structural analysis was completed on May 26, 1981.

An evaluation of the final seismic structural loads on the structure was completed on June 12, 1981, with no changes required to the original design.

The final seismic floor response spectra was completed on July 7, 1981. An evaluation of the floor response spectra loads on the structure was completed on August 17, 1981, with no changes required to the criginal design.

2. Equipment Hatch Access Platform The final seismic structural analysis was completed on April 1, 1981.

An evaluation of the final seismic structural loads on the equipment hatch access platform was completed on May 15, 1981, with no changes required to the original design. Floor response spectra are not applicable to the equipment hatch access platform since it is a non-

. Seismic Category I safety-related structure.

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_a 3 Waste Management Building The final seismic structural analysis was completed on June 4,1981.

i An evaluation of the final seismic structural loads on the waste

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management building.was completed on June 12, 1981, with no changes i

. required to the original design. -

The final seismic floor response spectra was completed on July 20, .

1981. An evaluation of the floor response spectra loads on the. ,

structure was completed on August 12, 1981, with no changes requit 3 to the original design.

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