ML20206Q024
| ML20206Q024 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 08/22/1986 |
| From: | Joshua Wilson Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8608270431 | |
| Download: ML20206Q024 (5) | |
Text
UNITED STATES 3'
NUCLEAR REGULATORY COMMISSION 3 k& !
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Docket No.:
50-362 LICENSEE: Louisiana Power and Light Company FACILITY: Waterford Steam Electric Station, Unit 3
SUBJECT:
TRIP REPORT FOR SITE VISIT OF JULY 31, 1986 A site visit to Louisiana Power and Light Company's Waterford Steam Electric Station, Unit 3 was conducted on July 31, 1986 to allow staff from the NRC and Brookhaven National Laboratory (Bhl) to examine previously unmapped cracks in the common foundation basemat. A list of attendees at the site visit and exit briefing is provided in Enclosure 1.
The cracks of interest were discovered during the conduct of an 18-month surveillance required by the technical specifications and reported to the NRC on June 2, 1986. The followup engineering evaluation filed by LP&L on July 1, 1986 stated that the cracks were not new cracks, but were old cracks that had not been previously mapped because they had been inaccessible during the mapping effort due to equipment placement, flooding, temporary storage or construction activity.
At the conclusion of the site visit, the NRC staff and B'NL presented their conclusions concerning the cracks, the surveillance program required by tech spec, and the followup engineering evaluation. These conclusions are listed below.
1.
It appears that LP8L does not yet have a complete baseline map of all cracks in the basemat. Fany of the cracks that have alreacy been mapped are fine and of short length. There is no problem discerning large cracks of such a nature (i.e., greater then 10 feet or wider than 15 mils) as te exceed the trigcer values in the surveillance program and therefore be reported immediately to NRC, with a following engineering evaluation being filed 30 days later.
It was suggested that if LP&L intends to maintain a finely-detailed crack map as they presently are attempting, that.they concentrate their efforts in areas where additional cracking would be indicative of a problem with.basemat structural integrity and strength and that these areas also be located such that they will not be inaccessible at a later date. For the rest of the basemat, the current monitoring program and periodic updat.ing of the crack map should still be maintained.
There was some discussion about enhancement of the mapped cracks and marking of the ends of the cracks, as well as the feasibility of a photographic record, but no conclusion were reached in either regard.
8608270431 860822 PDR ADOCK 05000382 P
2.
The staff and its consultants (BNL) concluded that more strain gauges were needed. Only two of the gauges have been installed on the E-W cracks that have been of greatest interest.
3.
It was suggested that if additional radial cracks are predicted by the construction sequences analysis, this should be.a prominent conclusion i
of the final report. The significance of any such cracks should be addressed ahead of time, rather than having to explain them after the fact.
4.
The monthly settlement data indicates a 0.36" deformation of the mat over the course of a year, which could lead to bending moments of approximately 10%
i of the normal condition (and which, therefore are considered to be small).
At present, no mechanism exists to account for this deformation of the mat, as water table measurements are only taken at 6-month intervals. It was suggested that water table measurements, taken at maximum and minimum levels, could possibly enable future significant correlations between ground water levels and mat flexure.
5.
It was concluded that all the newly mapped-cracks (with the possible exception of one superficial crack on the E side near a stairwell) are old cracks that were missed in previous mapping efforts due to inaccessibility of some areas of the basemat becauce of equipment placement, flooding, i
temporary storage or construction activity.
It was judged that the newly-mapped cracks fit the same pattern as the old cracks, possess the same apperence as the old cracks, and are consistent with what was expected to occur as a reselt of the construction sequence. Hence, the staff's evaluation of the significance of basemat cracks and the plant's licensing basis has not changed.
1 A followup audit for the horizontal analysi's, tentatively scheduled for August 27, 1986, has been rescheduled for August 29, 1986 at EBASCO in New York.
It is anticipated tt.at full final report for the confirmatory analyses program will be submitted by LP&L in September 1986.
/S/
James H. Wilson, Project Manager PWR Project Directorate No. 7 Division of PWR Licensing-B r
Enclosure.
As st6ted cc: See next page PD7 9 u
PBEB d dh DIR':PD7 JWils@/yt PTKuo GWKnighton 8/ c 86 8/$86 8/22/86 7
Mr. G. W. Muench Louisiana Power & Light Company Waterforo 3 cc:
W. Malcolm Stevenson, Esq.
Regional Administrator, Region IV Monroe & Leman U.S. Nuclear Regulatory Commission 1432 Whitney Building Office of Executive Director 3
~
New Orleans, Louisiana 70103 for Operations 611 Ryan Plaza Drive, Suite 1000 Mr. E. Blake Arlington, Texas 76011 Shaw, Pittman, Potts and Trowbridge 1800 M Street, NW Carole H. Burstein, Esq.
Washington, D.C.
20036 445 Walnut Street hew Orleans, Louisiar.& 70118 Mr. Gary L. Groesch P. O. Box 791169 Mr. Charles B. Brinkman, Manager hew Orleans, Louisiana 70179-1169 Washington Nuclear Operations Combustion Engineering, Inc.
Mr. F. J. Drummond 7910 Woodmont Avenue, Suite 1310 Project Manager - 14uclear Bethesda, Maryland 20814 Louisiana Power and Light Company 142 Celaronde Street New Orleans, Louisiana 70174 Mr. K. W. Cook f
Nuclear Support and Licensing Manager i
Louisiana Power and Light Company l
142 Delaronde Street New Orleans, Louisiana 70174 l
Resident Inspector /Waterford NPS P. O. Box 822 i
Killona, Louisiana 70066 l
Mr. Ralph T. Lully Manager of Quality Assurance Middle South Services, Inc.
P. O. Box 61000 New Orleans, Louisiana 70161 Chairman Louisiana Public Service Commission One American Place, Suite 1630 Baton Rouge, Louisiana 70804 i
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List of Attendees at Waterford 3 Site Visit July 31, ISE6 and Their Affi11tation i
NRC G. Constable P. Kuo J. Luehman
~J. Wilson l
BNL C. Costantino C. Miller LP&L R. Bagnetto R. Eurski i
C. Cook A. DuBouchet M. Holley J. Schlesinger EBASCO I. Bari t
P. Liu A. Wern G. Wu J
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