ML19331C836

Final Deficiency Rept Re Anchor Spacing on surface-mounted Plates.Util Will Remount All Nonconforming Plates W/Anchors Which Meet Spacing Requirements of Spec 300-06,Revision 6. All Work Will Be Completed by 801114

ML19331C836
Person / Time
Site:	Hartsville
Issue date:	08/11/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:
References
NCR-HNP-1-106, NCR-HNP-A-106, NUDOCS 8008190611
Download: ML19331C836 (2)

Text

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4 TENNESSEE VALLEY AUTHORITY CH ATT ANCOGA. TENNESSEE 374o1 400 Chestnut Street Tower II August 11, 1980 Mr. James P. O'Reilly, Director Office of Inspection and Tnforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303

Dear Mr. O'Reilly:

HARTSVILLE NUCLEAR PIANT - REPORTABLE DEFICIENCY - ANCHOR SPACING ON SURFACE MOUNTED PLATES (NCR HNP-A-106)

Initial notification of the subject deficiency was made to NRC-OIE, Region II, Inspector F. S. Cantrell on July 11, 1980. In compliance with paragraph 50.55(e) of 10 CFR Part 50, enclosed is the final report of the subject deficiency. If you have any questions regarding th.is subject, please call Jim Domer at PTS 857-2014.

Very turly yours, TENNESSEE VALLEY AUTHORITY l

)

l L. M. Mills, Manager Nuclear Regulation and Safety 1

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

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Bol7 s

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l 8 0 0 819 o 6 t. l 3 An Equal Oc:ortunity Emclover l

s ENCLOSURE HARTSVILLE NUCLEAR PLANT UNIT A1 ANCHOR SPACING ON SURFACE-MOUNTED PLATES 10 CFR PART 50.55(e) REPORT NO.1 (FINAL)

NCR HNP A-106 Cn July 11, 1980, TVA infer =ed NRC-0IE, Region II, Inspector F. A. Cantrell of a potentially reportable condition under 10 CFR Part 50.55(E) concerning anchor spacing on installed surface-mounted plates in Hartsville Nuclear Plant Unit A1 not meeting spacing requirements of C. F. Braun STRIDE Specificatien 300-06, Revision 6.

This is a final report on the subject condition.

Descriction of Deficiency Installation of surface-counted plates in the STRIDE portion of the Hartsville Nuclear Plant is governed by C. F. Braun STRIDE Specification 300-06 (hereinaf ter referred to as Spec 300-06). On May 15, 1980, C. F. Braen issued Revisien 6 of Spec 300-06 which defined minimum spacing of anchors fce those plates. Previous to issuance of Revision 6, TVA had been installing surface-=ounted plates in Hartsville unit A1 to Spec 300-06, Revisien 5, as required. However, 30 of those plates which have been installed do not meet the new requirements of 300-06, Revision 6, cencerning mini =um anchor spacing.

Safety !=clications Discussions with GE/C. F. Braun revealed that the minimum anchcr' spacing was established in Spec 300-06, Revisien 6, primarily to prevent anchors on i==ediately adjacent surface-counted plates from being too close and causing overlap of their anchorage forces within the concrete. GE/C. F. Braun does not anticipate that c ission of the mini =um spacing requirement in Spec 300-06, Revision 5, and earlier revisions resulted in any plates being mounted which would lead to a substantial safety hacard or adversely affect the safety of operations.

GE/C. F. Braun reasoning is based on engineering judgnent considering that the plates are designed with a factor of safety of 4 or 5 and adjacent plates will not necessarily receive their maximum design loads simultaneously (e.g.,

theraal loads). Also, anchors placed too close toget.her on a single plate could result in a reduction of the individual anchoa capacities, but the overall plate capacity would not necessarily be reduced (1,e. , load is spread over =cre anchors).

TVA concurs with the GE/C. F. Braun assessment. However, since TVA does not plan to reanalyce the plates involved (see corrective action) and thereby confirm that no safety concern existed, TVA considers this condition to be reportable under 10 CFR Part 50.55(e).

I Ccerective Action TVA has identified all surface-counted plates at Hartsville that do not conform to the require =ents of Spec 300-06, Revision 6. TVA will renount each of these plates with anchors which =eet the spacing requirements of Spec 300-06, Revision 6. No retnalysis will be performed since the current specificatiens wil be complied with. This work will be completed on er by November 14, 1980.

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