ML19345D791

Part 21 Rept Re B&W Nonconservative Analysis of Neutron Flux,Initially Reported on 801105.Util Is Awaiting Vendor Proposed Resolution.Next Rept Will Be Submitted by 810331

ML19345D791
Person / Time
Site:	Bellefonte
Issue date:	12/03/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-80-322-000 10CFR-050.55E, 10CFR-50.55E, NCR-BLN-NEB-800, NUDOCS 8012160675
Download: ML19345D791 (3)

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PRELIMINARY EVALUATION OF THE' ATTACHED REPORT ItOICATES LEAD RESPONSIBILITY FOR FOLLOWl)P .AS SHOWN BELOW:

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TENNESSEE VALt.t?Y AUTHORITY CH ATTANOOGA. TENr.r5SEE 374ot 400 Chestnut Street Tower II 66-95b5A -

Dece:ber 3, 1980 N

Mr. James P.N,0'Reilly, Director Office of Inspection and Enforce =ent U.S. Muclear Regulatory Cc=tissic:

Recion II - Suite.3100 101 Marietta Street \

Atlantc. Georgia ?O

Dear Mr. O'Reilly:

EC LEFO:TE NUOLEAR PLANT UNITS 1 AND 2 - BAEC00C & WILCOX'S NONCONSERVAT1TE ANALYSIS OF EUTRD'i FLUI - NCR ELN EB 8007 - FIRST INTERIM REPORT On Nove=ber 5, 1980, R. W. Wright, NRC-CIE Region II, was infor=ed that the subject nonconformance was deter =ined to be reportable in accordance with 10 CFR 50.55(e). Enclosed is our first interic report. We censider 10 CFR Part Q to be applicable to this deficiency. We expect to sub=it our next report by March 30, 1981.

If you have any questions concerning this =atter, please get in touch with D. L. Lambert at FTS 657-2551.

Very truly yours, TEN!.*T.SSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc: Mr. Victor Stello, Jr., Director (Enclcsure)k /

Office of Inspection and Enforce =ent U.S. Nuclear Regulatory Cc=nission Washington, DC 20555 D**]D "]D 7f @

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An Ecual Oppertun:t. E-::'pye'

e ENCLOSURE BELLEFO TE NUCLEAR PLA:iT "!:IIS 1 AllD 2 BABCOCK & WILCOX'S (B&W) !!C:;;0:: SERVAT.~"E A:lALYSIS OF NEUTRON FLUX NCR BLN !!EB 8C37 10 CFR 50.55(e)

FIRST INTERIM REFDET Description of Deficiency B&W's ceasurement errors assu=ed in determining reactor protection syste=

setroints may be nonconservative under specific plant conditions. These errors may allow operation cutside the established safety limits in certain design basis events.

The events of concern are: small evercooling and small steam line break; large . *am line break in containment; and the rod ejection accident.

Interim Progress TVA has requested that b&W address the sub'ect deficiency and provide a resolution. TVA is awaiting B&W's response.

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