ML19332A074
| ML19332A074 | |
| Person / Time | |
|---|---|
| Site: | Hartsville  |
| Issue date: | 08/11/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NCR-HNP-A-106, NUDOCS 8009100526 | |
| Download: ML19332A074 (2) | |
Text
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pgo-OJh TENNESSEE VALLEY AUTHORITY CHATTANOOGA TENNESSEE 374ot
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400 Chestnut Street Tower II
. ] /314 A S: 41 August 11, 1980 1 r. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia-30303
Dear Mr. O'Reilly:
HARTSVILLE NUCLEAR PLANT - REPORTABLE DEFICIENCY - ANCHOR SPACING ON SURFACE MOUNTED PLATES (NCR HNP-A-106)
Initial notification of the subject deficiency was made to NRC-0IE, 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 this subject, please call Jim Domer at FTS 857-2014.
Very turly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555
<$ 019 S'i
.8009100 6 %
_ i i;.i i l' An Equal Opportunity Employer
O 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 On July 11, 1980, TVA informed 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 j
Unit A1 not meeting spacing requirements of C. F. Braun STRIDE Specification i
300-06, Revision 6.
This is a final report on the subject condition.
j Description of Deficiency Installation of surface-mounted plates in the STRIDE portion of the Hartsville Nuclear Plant is governed by C. F. Braun STRIDE Specification 300-06 (hereinafter referred to as Spec 300-06). On May 15, 1980, C. F. Braun issued i
Revision 6 of Spec 300-06 which defined minimum spacing of anchors for those plates. Previous to issuance of Revision 6, TVA had been installing surface-mounted plataa in Hartsville unit Al to Spec 300-06, Revision 5, as 4
i required. However, 30 of those plates which have been installed do not meet the new requirements of 300-06, Revision 6, concerning minimum anchor spacing.
4 Safety Implications Discussions with GE/C. F. Braun revealed that the minimum anchor spacing was established in Spec 300-06, Revision 6, primarily to prevent anchors on y
l immediately adjacent surface-mounted plates from being too close and causing overlap of their anchorage forces within the concrete. GE/C. F. Braun does r.ot anticipate that omission of the minimum spacing requirement in Spec 300-03, Revision 5, and earlier revisions resulted in any plates being mounted which would lead to a substantial safety hazard or adversely affect the safety of operations.
GE/C. F. Braun reasoning is based on engineering judgment considering that j
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.,
l thermal loads). Also, anchors placed too close together on a single plate f
could result in a reduction of the individual anchor capacities, but the overall. plate capacity would not necessarily be reduced (i.e., load is spread over more anchors).
l TVA concurs with the GE/C. F. Braun assessment. However, since TVA does not
. plan to reanalyze 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 f
. Corrective Action TVA has identified all surface-mounted plates at Hartsville that do not conform to the requirements of Spec 300-06, Revision 6.
TVA will remount each of these plates with anchors which meet the spacing requirements of Spec 300-06,' Revision 6.
No reanalysis will be performed since the current specifications wil be complied.with. This work will be completed on or by 1
November 14, 1980.
1
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