ML18017B133
| ML18017B133 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 06/05/1980 |
| From: | HOWE P W CAROLINA POWER & LIGHT CO. |
| To: | OREILLY J P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML18017B132 | List: |
| References | |
| NUDOCS 8007100418 | |
| Download: ML18017B133 (3) | |
See also: IR 05000400/1980011
Text
(~.~CHAL Carolina Power&Light Company Jltd I.'l: SO June 5, 1980 Mr.James P.O'Reilly United States Nuclear Regulatory
Commission
Region II 101 Marietta Street, Northwest Atlanta, Georgia 30303 Dear Mr.O'Reilly: In reference to your letter of May 13, 1980, referring to RII: JJL 50-400/80-11, 50-401/80-08, 50-402/80-08
and 50-403/80-08, the attached is Carolina Power and Light Company's reply to the in-fraction identified
in Appendi1t A.It is considered
that the corrective
and preventive
actions taken are satisfactory
for resolution
of this item.Thank you for your cooperation
in this matter.Yours very truly, P.M.Howe Vice President Technical Services NJC/mst cc: Mr.J.A.Jones eoovxoo'/(tr
411 Fayetteville
Street~P.O.Box 1551~Raleigh, N.C.27602~.if::>';It,".TAT.
COPY
Condition Reporte As required by Criterion III of Appendix B to 10 CFR 50, implemented
by Carolina Power and Light PSAR Section 1.8,"Measures shall be establisped
to assure that applicable
regulatory
requirements
and the design basis...are correctly tr anslated into specifications, drawing, procedures, and instructions.
These measures shall include provisions
to assure that appropriate
quality standards are specified and included in design documents and that deviations
from such standards are controlled".
ANSI N45.2.11, implemented
by PSAR Section 1.8.1, requires design inputs, which include structural
requirements
such as foundations
and pipe supports, to be specified to the level of detail necessary to permit the design activity to be carried out in a correct manner and to provide a consistent
basis for making design decisions.
Contrary to the above, the measures required by Criterion III failed to assure that the design inputs concerning
the effect of settlement
of the backfill supporting
Category I piping adjacent t'o the powerblock
was eval-uated in design analysis of the piping.Omission of these design inputs could have resulted in overstressing
and failure of the piping.As a result, the backfill supporting
the piping has been or will be excavated and replaced with fill concrete in order to provide the necessar y foundation
support for the piping where it enters the powerblock.
Corrective
Steps Taken and Results Achieved: The infraction
resulted since the effect of settlement
of backfill which provides support for Seismic Category I piping adjacent to the plant buildings was not considered
in the design of the building by the Architect Engineer.Corrective
action completed in relation to backfill material affecting Category I piping includes the following:
l.An investigation
into previously
collected test data.2.Plan and section details added on design drawing reflecting
locations of all relevant fill and backfill materials affecting Category I piping and duct banks.3.Design data input compiled from previous results of field and laboratory
tests.4.Theoretical
estimates of settlements
were researched
and compiled.5.Assessments
of the stability and dynamic behavior of the Category I pipelines and fill.6.A revised inspection/testing
procedure to assure full compliance
with realigned design criteria.7.Revised design drawing (Revision 2, CAR-2167-G-0488)
identifying
and detailing backfill adjacent to Seismic Category I buildings.
Infraction
Page Two Prior to placement of any backfill material adjacent to the power block where Category I piping would span, a design drawing change was initiated to require 2,000 p.s.i.concrete fill.The concrete was placed in the ex-cavated void under the area of Category I pipes between the building concrete wall and the excavation
soil/rock slope, and from the lower foundation
rock to six inches below pipe invert.Corrective
Steps Taken to Avoid Further Noncompliance:
The application
of concrete backfill in areas of abrupt changes in backfill depth will result in an insignificant
differential
of settlement
and eliminate the possibility
of overstressing
piping.The completed research, issue of detailed design drawing and revision to inspection/testing
procedure (T.P.-02, Revision 13 and 14)is considered
sufficient
to preclude further concern of subject design deficiency.
Date'/hen Full Compliance
Mill be Achieved: Item is considered
closed as of May 28, 1980.