ML20004F300
| ML20004F300 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 06/10/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8106180125 | |
| Download: ML20004F300 (5) | |
Text
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Docket No.: STN 50-483 Mr. John K. Bryan E
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Vice President v
E Union Electric Company
.Y9)Ny N 1901 Gratiot Street
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Post Office Box 149 St. Louis, Missouri 63166
Dear Mr. Bryan:
Subject:
Request for Additional Infonnatiori for the Review of the Callaway Plant, Unit 1 Concerning Hydrology As a result of our continuih, review of the Callaway Plant, Unit 1 FSAR, we find that we need additional information to complete our evaluation. The specific information required is in the area of hydrology and is presented in the Enclosure.
To maintain our licensing review schedule for the Callaway Plant FSAR, we will need responses to the enclosed request by June 26, 1981.
If you Cannot meet this date, please inform us within seven days after receipt of this letter of the date you plan to submit your responses so that we may review our s:hedule for any necessary changes.
Please contact Mr. Dromerick, Callaway Licensing Project Manager, if you desire any discussion or clarification of the enclosed request.
Sincerely, V' '
)
obhrt
.T sco, Assistant Director y
for Licensing
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Division of Licensing N
Enclosure:
As stated cc: See next page L
8106180/80 g
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Mr. J. K. Bryan Vice President - Nuclear Union Electric Company P. O. Box 149 St. Louis, Missouri 63166 cc: Mr. Nicholas A. Petrick Mr. Willia $Hansen Executive Director - SNUPPS Resident Insoector/Callaway NPS 5 Choke Cherry Road c/o USNRC Rockville, Maryland 20850 Steedman, Missouri 65077 Gerald Charnoff, Esq.
Shaw, Pittman, Potts &
Truwbridge 1800 M Street, N. W.
Washington, D. C.
20036 Mr. J. E. Birk Assistant to the General Counsel Union Electric Company P. O. Box 149 St. Louis, Missouri 63166 Dr. Vern Starks Route 1, Box 863 Ketchikan, Alaska 99901 Ms. TrevaHearn, Assistant General Counsel Missouri Publ.ic Service Commission P. O. Box 360 Jefferson City, Missouri 65102 Mr. D. F. Schnell Manager-Nuclear Engineering Union Electric Company P. O. Box 149 St. Louis, Missouri 63166 t
Request for Additional Information Callaway Unit 1 Docket No. STN 50-483 240.0 Hydrologic Engineering 240.1C Figure 2.1-3 does not show the location of the inlet nor pipeline (as (2.4.1) indicated in the second paragraph of section 2.4.1.1).
Revise that figure or provide another figure to show the locations as discussed in the text.
i 240.2C Figure 2.1-4 does not show the location of the UHS retention pond (as (2.4.1) indicated in the fourth paragraph of section 2.4.1.1).
Revise that figure or provide another figure showing the retention pond as discussed in the text.
240.3C -
The U.S. Army Corps of Engineers hypothetical flood studies for the (2.4.3)
Missouri River (1979) cited in section 2.4.3 does not appear in the list of references. Provide the complete title and other pertinent informa tion.
If the reference is to a written communication from the Corps of Engineers, please provide a copy of that communication.
240.4 C a) Your analysis of forces on the UHS retention pond safety related (2.4.7) structures is based upon thermal expansion of an ice layer with a thickness that has a recurrence interval of 100 years (1 nercent chance per year). This is not an adequate design basis for safety related structures with respect to natural phenomena as required by General Design Criterion 2 of 10 CFR 50 Appendix A and does not
2 meet Regulatory Position 2 of Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Power Plants". Also, no basis for the assumed temperature rate of rise of 5'F per hour is provided.
Provide an analysis to determine the upper limit of ice thrust forces that could be exerted on safety related structures in the UHS retention pond. Provide all historical data (and their source) used in your analysis.
Provide details of any frequency analyses performed and describe any joint probability considerations between ice layer thickness and rate of temperature rise.
If the mechanical and/or heat transfer properties of the ice layer are used to limit the thrust forces, provide the basis for all coefficients assumed.
b)
If all safety related structures in the UHS retention pond cannot be shown to withstand the upper limit of ice thrust forces determined in response to a) above, discuss procedures to be included in the plant technical specifications to limit the thrust forces, protect the structures, or shut the plant down during times of ice builduo.
240.5 C Provide the basis for the wind speeds used in the computation of drag (2.4.7) forces on the ice surface in the ultimate heat sink retention pond.
Justify that :Se severity meets the intent of General Design Criterion 2 and Position 2 of Regulctory Guide 1.27.
Provide the drag coefficient used l
and the thrust forces calculated. Discuss the impact forces that would result if the pond was only partially covered by ice and ice sheets were driven by wind into the ESWS pumphouse. Provide the basis for all assumptions used in your analysis.
240.6C Provide additional details regarding the determination of the probable (2.4.0) maximum wind for determination of wave action on the UHS retention pond.
Describe the origin of the data used in the analysis and show the maximum likelihood frequency estimate and 95% confidence interval.
Discuss the effect of recent regional windspeed data (collected since Thom's report) on 0.he frequency estimates.
240.7 C a) Provide details of your transient analyses of temperature and water
~(2.4.1.1) supply for the UHS cooling tower system during the critical 30-day period as discussed in Position 1 of Regulatory Guide 1.27.
b) Discuss a pre-operational
- ting program and the-analysis.of.the resulting data to be used to verify the conservatism of estimates made in response to part a) above.
240.8 C Discuss provisions to replace make up water in the UHS retention pond (2.4.11) in the event that the Missouri River intake and pumping system should remain inoperable after 30 days.
240.9 C State whether any permanent underdrain or groundwater dewatering systems 1
(2.4.13) are installed, being constructed, or planned at the plant site.
If so, provide the information called for in Branch Technical Position HMS/GSB 1
" Safety-Related Permanent Dewatering Systems".
.