ML20207G255
| ML20207G255 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 08/08/1988 |
| From: | Alexion T Office of Nuclear Reactor Regulation |
| To: | Schnell D UNION ELECTRIC CO. |
| References | |
| NUDOCS 8808240035 | |
| Download: ML20207G255 (3) | |
Text
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August 18, 1988 Docket No.
50-483
,DISTRLBUT;0N:
ligeeselmes o NRC & Local PDRS PDI!!-3 r/f KPerkins GHolahan PKreutzer TAlexion OGC-WF1 Mr. Donald F. Schnell EJordan BGrimes Vice President - Nuclear ACRS(10)
PDIII-3 Gray Files Union Electric Company JPersensky WRegan Post Office Box 149 Glapinski St. Louis, Missouri 63166
Dear Mr. Schnell:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE RUPTURE ANALYSIS The staff is continuing its review of your steam generator tube rupture analysis. The staff requests additional information identified in the enclosure to continue its review.
It is requested that you respond within 60 days of your receipt of this letter.
This request for infonnation affects fewer than 10 respondents; therefore, OMB clearance is not required under Pub. L.96-511.
Sincerely, is /
Thomas W. Alexion, Project Manager Project Directorate III-3 Division of Reactor Projects - I!!,
IV, Y and Special Projects
Enclosure:
As stated cc:
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Date:
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REQUEST FOR INFORMATION After consideration of the staff's teleconference with the licensee on April 8, 1988, the staff has detemined that the operator response times provided by the licensee in its February 3,1987 response to the staff's request for information of November 12, 1986 are inappropriate for purposes of the staff's review.
Specifically, the staff understands that the licensee has estimated these times rather than demonstrated them.
In its letter to the Wr.stinghouse Owners Group dated March 30, 1987, the staff required "... demonstration runs...to show that the accident can be mitigated within a period of time compatible with overfill prevention, using design basis assumptions regarding available equipment, and to demonstrate that the operator action times assumed in the analysis are realistic." The licensee has provided an analysis that uses "best-guess averages" for operator response times for critical tasks, such as identifying the Steam Generator Tube Rupture through recognition of increasing, uncontrolled level g 'Jigh radiation, including manual sampling of steam generator liquid.
The licensee should provide further information that demonstrates that the oper-ator response times assumed in the Callaway analyses are realistic, e.g. are representative of the operator population at the plant, and that the maximum response times fall within the bounds of the analysis. This information should address both control room actions and actions performed outside the control room such as manual steam generator liquid sampling.
Mr. D. F. Schnell Callaway Plant Union Electric Company Unit No. I cc:
Dr. J. O. Cermack Mr. Bart D. Withers CFA Inc.
President and Chief 4 Professional Dr., Suite 110 Executive Officer Gaithersburg,MD 20879 Wolf Creek Nuclear Operating Corporation Gerald Charnoff, Esq.
P. O. Box 411 Thomas A. Baxter, Esq.
Burlington, Kansas 66839 Shaw, Pittman, Potts & Trowbridge 2300 N Street, N. W.
Mr. Dan I. Bolef, President Washington, D. C.
20037 Kay Drey, Representative Board of Directors Coalition Mr. T. P. Sharkey for the Environment Supervising Engineer, St. Louis Region Site Licensing 6267 Delmar Boulevard Union Electric Company University City, Missouri 63130 Post Office Box 620 Fulton, Missouri 65251 U. S. Nuclear Regulatory Comission Resident Inspectors Office RRf1 Steedman, Missouri 65077 Mr. Alan C. Passwater, Manager Licensing and Fuels Union Electric Company Post Office Box 149 St. Louis, Missouri 63166 Manager - Electric Department l
Missouri Public Service Comission l
/
l 301 W. High l
Post Office Box 360 Jefferson City, Missouri 65102 Regional Administrator U. S. NRC, Region III 799 Roosevelt Road Glen Ellyn. Illinois 60137 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P. O. Box 176 Jefferson City, Missouri 65102
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