ML20210S095
| ML20210S095 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/30/1986 |
| From: | Jacqueline Thompson Office of Nuclear Reactor Regulation |
| To: | Conway R GEORGIA POWER CO. |
| References | |
| NUDOCS 8610080008 | |
| Download: ML20210S095 (4) | |
Text
p3 KIF
+
4 UNITED STATES
_ h([ -
vvasnemu s um. u. c. zunno NUCLEAR REGULATORY COMMISSION c
s 30 SEP 199[,
4 Docket Nos.: 50-424 and 50-425 Mr. Richard Conway Vice President and Project General Manager Georgia Power Company Route 2 Box 299A Waynesboro, Georgia 30830
Dear Mr. Conway:
SUBJECT:
V0GTLE DESIGN LIVE LOAD CRITERIA By letter dated August 11, 1986, the staff requested additional information on Vogtle's structural design for live loads with Category I structures.
During an inspection at the Vogtle site last December, the NRC identified an issue which ' appeared to be a deviation from an FSAR consnitment associated with load combinations. Specif.ically, it was noted that 25% of the design live load was combined with earthquake loads in the design of containment internal structural steel and auxiliary building miscellaneous steel platfoms. As a response to the staff's concern, the applicant stated that a similar question had been raised by the Structural and Geotechnical Engineering Branch of NRR during a December 4-6, 1984 audit, and that the response to that particular question was accepted by the staff.
Through telephone discussions on April 23 and July 1,1986, the staff requested the applicant to provide justification for using 25% of design live load in some load combinations and clarification on the definition of design live loads. On July 23, 1986, a meeting was held to discuss the Vogtle design live load criteria and applicant's responses to staff questions.
It was established during the meeting that the applicant had not deviated from an FSAR commitment associated with load combinations, via FSAR Section 3.8.4.3 and Table 3.8.4-1.
However, it was agreed ir-the meeting that (a) the definition of the live load and its symbol L as used in the load combination expressions is not clear, and needs further explanation and clarification; (b) the load factor 1.0 applied to the symbol L should not be interpreted as the fraction of design live load; (c) the symbol L itself should be interpreted to include a certain percentage, 25%
of the pertinent design live load for a given structural element as described in Section 3.8.4.3.1.1 of the FSAR when load combination involves earthquake loads; (d) the definition of L and the load combinations stated in the FSAR should be applied to all Category I structures; and (e) the above listed clarifications (items (a) through (d)) should be documented in future FSAR amendments.
8610080008 860930 PDR ADOCK 0500 4
A
,Mr. Richard Conway Subsequent to the July 23, 1986 meeting, the staff has received and reviewed the applicant's response to the staff request for additional information and the proposed FSAR amendment. The staff finds that the determination of design live load based on pre-fuel and post-fuel load conditions is reasonable and that the explanation on use of 25% of the pre-fuel load maximum design live load as a lower bound of the post-fuel load design live load is satisfactory.
The proposed FSAR amendment will clarify the definition of the symbol L (Section 3.8.4.3) in the load combination equations (Tables 3.8.4-1 thru 3) and is therefore acceptable.
Since e y, il(.
Jo n
. Thompson Project Manager PW Project Directorate #4 Division of PWR Licensing-A cc: See next page
C
- Mr. R. E. Conway Georgia Power Company Vogtle Electric Generating Plant cc:
Mr. L. T. Gucwa Resident Inspector Chief Nuclear Engineer Nuclear Regulatory Comission Georgia Power Company P. O. Box 572 P.O. Box 4545 Waynesboro, Georgia 30830 Atlanta, Georgia 30302 Mr. Ruble A. Thomas Deppish Kirkland, III, Counsel Vice President - Licensing Office of the Consumers' Utility Vogtle Project Council Georgia Power Company /
Suite 225 Southern Company Services, Inc.
32 Peachtree Street, N.W.
P.O. Box 2625 Atlanta, Georgia 30303 Birmingham, Alabama 35202 James E. Joiner Mr. Donald 0. Foster Troutman, Sanders, Lockerman, Vice President & Project General Manager
& Ashmore Georgia Power Company Candler Building Post Office Box 299A, Route 2 127 Peachtree Street, N.E.
Waynesboro, Georgia 30830 Atlanta, Georgia 30303 Danny Feig Mr. J. A. Bailey 1130 Alta Avenue Project Licensing Manager Atlanta, Georgia 30307 Southern Company Services, Inc.
P.O. Box 2625 Carol Stangler Birmingham, Alabama 35202 Georgians Against Nuclear Energy 425 Euclid Terrace Ernest L. Blake, Jr.
Atlanta, Georgia 30307 Bruce W. Churchill, Esq.
Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.
Washington, D. C.
20037 Mr. G. Bockhold, Jr.
Vogtle Plant Manager Georgia Power Company Route 2, Box 299-A Waynesboro, Georgia 30830 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323
Nr. Richard Conway 3 0 SEP 1986 Subsequent to the July 23, 1986 meeting, the staff has received ar.d reviewed the applicant's response to the staff request for additional information and the proposed FSAR amendment. The staff finds that the determination of design live load based on pre-fuel and post-fuel load conditions is reasonable and that the explanation on use of 25% of the pre-fuel load maximum design live load as a lower bound of the post-fuel load design live load is satisfactory.
The proposed FSAR amendment will clarify the definition of the symbol L (Section 3.8.4.3) in the load combination equations (Tables 3.8.4-1 thru 3) and is therefore acceptable.
Sincerely, John W. Thompson, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A cc: See next page DISTRIBUTION:
" Doctet J11es~~
'NRC PDR Local PDR PWR#4 Reading F0uncan JThompson BJYoungblood Reading DGC EJordan JPartlow BGrimes ACRS(10)
?
c DPWR{-A
\\
il PWR#4 A
MUE(canPWRAf9PWR-A PWR1 JTho
/ rad n
BJYoungblood 09/J 09/dy/86 09/3786
.