ML20012E551
| ML20012E551 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/29/1990 |
| From: | Kintner L Office of Nuclear Reactor Regulation |
| To: | Cottle W SYSTEM ENERGY RESOURCES, INC. |
| References | |
| TAC-72718, NUDOCS 9004050392 | |
| Download: ML20012E551 (4) | |
Text
._
l March 29, 1990 Docket No.
50-416 Mr. W. T. Cottle L
Vice President, Nuclear Operations System Energy Resources, Inc.
P.O. Box 469 Port Gibson, Mississippi 39150
Dear.Cottle:
SUBJECT:
GRAND GULF NUCLEAR STATION, UNIT 1 - GAPS IN BORAFLEX OF HIGH DENSITY SPENT FUEL RACKS (TAC NO. 72718)
By letter dated December 5,1989, System Energy Resources, Inc., (the licensee) provided a response to our August 25, 1989 request for additional information concerning the Boraflex surveillance program for the high density spent fuel racks at Grand Gulf Nuclear Station, Unit 1.
The NRC staff is reviewing your submittal and finds additional information is required regarding the surveillance program for the Boraflex panels of the racks.
In order to support our review schedule, you are requested to respond to the enclosed request by April 30, 1990.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P. L.96-511.
Sincerely, Original Signed By:
Lester L. Kintner, Senior Project Manager Project Directorate 11-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
Request for Additional Information cc w/ enc 1.
See next page I
DISTRIBUTION See a~ttached page 9004050392 900416 l
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'a Mr. W. T. Cottle i
System Energy Resourcos, Inc.
Grand Gulf Nuclear Station (GGNS) cc:
I Mr. T. H. Cloninger Mr. C. R. Hutchinson
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Vice President, Nuclear Engineering GGNS General Manager l
& Support System Energy Resources, Inc.
i System Energy Resources Inc.
P. O. Box 756 P. O. Box 31995 Port Gibson, Mississippi 39150 l
1ackson, Mississippi 39286 Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.
Wise, Carter, Child, and Attorney General Caraway Department of Justice P. O. Box 651 State of Louisiana Jackson, Mississippi 39205 P. O. Box 94005 Baton Rouge, LA 70804 9005 Nicholas S. Reynolds, Esquire Bishop, Cook, Purcell Alton B. Cobb, M.D.
3 and Reynolds State Health Officer i
1400 L Street, N.W. - 12th Floor State Board of Health Washington, D.C.
20005-3502 P. O. Box 1700 l
Jackson, Mississippi 39205 l
Mr. Ralph T. Lally Manager of Quality Assurance l
Entergy Services, Inc.
Office of the Governor P. O. Box 31995 State of Mississippi Jackson, Mississippi 39286 Jackson, Mississippi 39201 i
Mr. Jack McMillan, Director President, Division of Solid Waste Management Claiborne County Board of Svpersisors Mississippi Department of Natural Port Gibson, Mississippi 39150 Resources P. O. Box 10385 Jackson, Mississippi 39209 Regional Administrator, Region II i
U.S. Nuclear Regulatory Commission Mr. John G. Cesare 101 Marietta St., Suite 2900 Director, Nuclear Licensing Atlanta, Georgia 30323 l
System Energy Resources. Inc.
[
P. O. Box 469 i
Port Gibson, Mississippi 39150 Mike Moore, Attorney General Frank Spencer, Assist. Attorney General l
Mr. C. B. Hogg, Project Manager State of Mississippi Bechtel Power Corporation Post Office Box 22947 P. O. Box 2166 Jackson, Mississippi 39225 l
Houston, Texas 77252-2166 l
Mr. H. O. Christensen Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2. Box 399 l
Port Gibson, Mississippi 39150 i
e4 ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION REGARD]NG THE HIGH DENSITY SPENT FUEL RACK BORAFLEX GAP SURVEILLANCE PROGRAM GRAND GULF NUCLEAR STATION, UNIT 1 By letter dated December 5,1989, System Energy Resources, Inc. (the licensee) provided responses to the NRC request for additional information concerning the Boraflex gap surveillance program.
The responses did not adequately address the requests.
Provide the following information:
1.
With reference to Response No. 5, it is indicated that the silicon-based cement used to attach the Boraflex panels to the racks will keep the panels in place within the cell walls.
Provide information regarding tests pe" formed to ensure such adherence under seismic type loadings.
2.
In the second paragraph of Response No. 5, it is indicated that the Boraflex sheets at GGNS are so tightly sandwiched between sheets of stainless steel that even if a Boraflex segment is to become unattached from the cell wall, it would not be susceptible to movement.
A review of Figures 3.1 and 3.2 of "The Licensing Report on High Density Spent Fuel Racks," submitted by letter dat.ed May 6, 1985, indicates that the clear gap between the stainless steel 6heets is 0.132 inches, and the nominal Boraflex thickness is 0.070 inches.
Thus, there is a clear space of 0.062 inches in which the sheets can slump under seismic loading, if not kept in place by the adhesive.
Provide information on means to assure no excessive downward movement of Botaflex during a seismic event.
3.
With reference to Responses 4 and 6, provide clarification of what is meant by " scatter loading" if excessive degradation of Boraflex is indicated in the surveillance protjram.
If use of the racks is restricted because of excessive degradation describe the safety evaluation that will l
be performed and approvals, including NRC approval, that will be obtained prior to such use.
Provide results of blackness tests to date and compare with the EPRI data 4.
in EPRI NP-6159, December 1985.
Provide a commitment to submit data and analysis justifying discontinuance of the surveillance tests to the NRC for i
l review and approval prior to discontinuing the tests.
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G. Laines 14.H.3 E. Adensam 14.B.20 P. Anderson 14-B-20 L. Kintner 14.B.20 DGC (for inform. Only) 15-B-18 E. Jordan HNBB.3302 ACRS(10)
P.315 Grand Gulf file i
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