ML20091M385

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Twelfth Interim Deficiency Rept Re B&W Nonconservative Analysis of Neutron Flux.Initially Reported on 801105. Initial Rod Position & Axial Offset Limits Revised.Final Rept to Be Provided Pending Determination of Cause
ML20091M385
Person / Time
Site: Bellefonte  Tennessee Valley Authority icon.png
Issue date: 05/31/1984
From: Mills L
TENNESSEE VALLEY AUTHORITY
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8406110274
Download: ML20091M385 (1)


Text

TENNESSEE VALLEY AUTHORITY M 0 5 tnut' $ b owhr YI

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4llsM4yg3.1, 1984 U.S. Nuclear Regulatory Commission

  • Q Region II Attn:

Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - BABCOCK & WILCOX'S NONCONSERVATIVE ANALYSIS OF NEUTRON FLUX - NCR BLN NEB 8007 - TWELFTH INTERIM REPORT On November 5,1980, R. W. Wright, NRC-0IE Region II, was informed that the subject ronconformance was determined to be reportable in accordance with 10 CFR 50.55(e). This was followed by our interim reports dated December 3,1980, March 30 and September 21, 1981, February 22, April 27, August 10, arxi Novenber 16,1982, May 23 and October 20, 1983 and January 6 and April 6,1984. Below is our twelfth interim report. We consider 10 CFR Part 21 to be applicable to this deficiency. We expect to submit our next report by December 28, 1984 B&W's maponse to the subject deficiency has indicated that rn changes to plant hardware or setroirts are necessary. However, initial condition normal operating limits on rod position and axial offset were revised to produce acceptable results in the transient analyses. TVA has myiewed and accepted the results of the B&W analysis. We are still awaiting the root cause of this nonconfo."mance and the associated action to prevent recurrence from B&W arxi will provide this information in our final report.

If you have any questions concerning this etter, please get in touch with R. H. Shell at FTS 858-2688.

Very truly yours, TENNESSEE VALLEY AUTIIORITY L. M. Mills, nager Nuolear Licensing 00: Mr. Richard C. DeYoung, Diroator Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Babcock & Wilcox Company Attention: Mr. II. B. Barkley P.O. Box 1260 Lynchburg, Virginia 24505 Records Center ih Institute of Nuolear Power Operations 1100 Circle 75 Parkway, Suite 1500

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