ML19350D705
| ML19350D705 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/13/1981 |
| From: | Clark R Office of Nuclear Reactor Regulation |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8105180423 | |
| Download: ML19350D705 (5) | |
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[ y; y [o UNITED STATES NUCLEAR REGULATORY COMMISSION 3. t.c.m a
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Docket tio. 50-225 r'~ ['
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MAY 141981
- p Mr. W. C. Jones 4,,p" won
.,1 Division Manager, Production w "'*
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Omaha Public Power District 4
1623 Harney Street A
9 Omaha, tiebraska 68102
Dear Mr. Jones:
In conducting our review of your August 28, 1978 letter relating to adecurcy of station electric distributien system voltages at the Fort Calhoun Station, Unit No. 1, we have determined that we will need the additional information identified in the enclosure to continue our review.
In order for us to maintain our review schedule, your response is requested within 45 days of your receipt of this letter.
Please contact us if you have any questions concerning this matter.
Sincerely, w'
obert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing
Enclosure:
Request for Additional Informaticn cc w/ enclosure:
See next page
?00RORIBNAl.
f
- Muo993
T Omaha Public Power District cc:
Marilyn T. Shaw, Esq.
Of rector, Criteria and Standards Division LeBoeuf, Lamb,.Leiby & MacRae Office of Radiation Programs (ANR-460) 1333 New Hampshire Avenue, N.W.
U.S. Environmental Protection Agency Washington, D. C.
20036 Washington, D. C.
20460 Mr. Emmett Rogert U.S. Environmental Protection Agency Chairman, Washington County Region VII Board of Supervisors ATTN:
EIS COORDINATOR Blair, Nebraska 68023 324 East lith Street Kansas City, Missouri 64106 Omaha Public Power Of strict ATTN: Mr. Spencer Stevens Plant Manager Fort Calhoun Plant 1623 Harney Street Director, Nebraska Department of Omaha, Nebraska 68102 Environmental Control Mr. Frank Gibson P. O. Box 94877, State House Station W. Dale Clark Library Lincoln, Nebraska 68509 215 South 15th Stecet Omaha, Nebraska 68102 Alan H. Xirsher., Esq.
Fellman, Ramsey ', Kirshen 1166 Woodmen Tower Omaha, Nebraska 68102 Mr. Dennis Kelley U.S.N.R.C. Resident Inspectt-P. O. Box 68 Fort Calhoun, Nebraska 68023 Mr. Charles B. Brinkman
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Manager - Washington Nuclear Operations C-E Power Systems Combustion Engineering, Inc.
4853 Cordell Avenue, Suite A-1 Bethesda, Maryland 20014 O
e
e-REQUEST FOR ADDITIO!!AL I:; FOP.!'.ATIO!i REGARDitlG THE ACEQUACY OF STATI0fi ELECTRIC DISTRIBUT10ti CYSTEMS VOLTAGES FOR CALHOUN NUCLE /.R POWER PLAflT (Docket rio. 5'0-255)
Reference:
1.
T. E. Short, " Application for Amendment of Operating License,"
August 28, 1978.
2.
fiRC Letter, William Gammill, to All Power Reactor Licensees (Except Hu.,:boldt Bay), " Adequacy of Station Electric Distribution Systems Voltage," August 8, 1979.
QUESTI0 tis 0 } provide' transient voltage values during (A) Tables 1 and 2 of attachment 9 the sequenced starting of the engineered safeguard loads oc buses lA3 and 1A4.
What are the final (steady-state) voltages at the 4160V and 480V buses, the i.
4160V, 4000V, and 460V motor terminals; and the 460V motor starters when all safeguard loads are operating for Cases 4, 5, and 6 of Table 1 and Cases 3, 4, 5 and 6 of Tabl6~2?
2.
What tre the lowest 4160V bus transient voltages for Cases 4, 5, and 6 of Table 1 and 2, attachment 90 }?
(S) The volte5es at buses 1A3 and lA in Tab 4s 1, 2, and 3 of attschnent 5II) appear to be based on-trachformers il A3 and TlA4 set on the 165kV taa (see sheet 2).
What will the voltages be at buses lA3 and 1 A4 in Tables 1, 2, and 3 if the transformers are on the 161kV tao?
l
c (C) The FSAR and Attachment 6 } indicate that provisions exist to start up t*e plant from the 345kV source.
Can this source be used to safely stu: t'.e plant down under LOCA conditions if the 161kV source is not available?
If so, how soon would the 345kV source be available?
(D) What is the service factor for the 4160V, 4000V, and the 460V safeguards motors?
(E) The NRC letter of August 8, 1979(2) requires a test be performed to verify your analytical results.
The latest guidelines required that this test should be performed by:
(a) Loading the station distribution buses, including all Class lE buses down to the 120/208V level, to at least 30t; (b) Recording the existing grid and Class lE bus voltages and bus loading down to the 120/208 volt level at steady state conditions and during the starting of both a large Class lE and non-Class lE motor (not concurrently);
(Note) To minimize the number of instrumented lccations (recorders), during the motor starting transient tests, the bus voltages and loading need only be reccrded on that string of buses which previously showed the lowest analyzed voltages.
(c) Using the analytical technT4ues and assumptions of the previcus valtage analyses and the measured existing grid voltage and bus loading condi-tions recorded during conduct of test, calculate a new set of voltages for all Class lE buses down to the 120/208 volt level.
(d) Ccmpare the analytical derived voltage values against the test results.
With good correlation between the anal'ytical results and test results, the test verification requirement will be met.
That is, the validity of the mathematical rodel used i'n performance of the analysis will have been established.
In cer,eral
1 the test results should be within - 3', cf the analytical results; however, the differer.ce between the two when subtracted from or acded to should never pr:.idt values that would allow operation of the Class lE equiprent outside of rated voltage ranges.
Please provide a test description and date by when test results will be available.
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