ML20004F519
| ML20004F519 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/09/1981 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8106190002 | |
| Download: ML20004F519 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION gg
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June 9,1981
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- a sF4 a Docket No. 50-313 N
- f JUN 1 G 1981> p Mr. William Cavanaugh, III
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Senior Vice President 8 ""a%,
me Energy Supply 9
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Arkansas Power & Light Company 4
P. O. Box 551 m
Little Rock, Arkansas 72203
Dear Mr. Cavanaugh:
We are continuing to review Arkansas Nuclear One Unit No.1 (ANO-1) for the adequacy of Station Electric Distribution Voltage. In order for us to complete our review, we need additional infonnation identified in the enclosure. We request a response to this within 30 days.
Sincerely, L
oh
. Stolz, Chief ating Reactors Branch #4 Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
See next page 1
810 6 l'9 0 @ A
Arkansas Power & Light Company ccw/ enclosure (s):
Mr. David C. Trimble Manager, Licensing Arkansas Power & Light Company P. O. Box 551 Director, Bureau of Environmental Little Rock, Arkansas 72203 Health Services 4815 West Markham Street Mr. James P. O'Hanlon Little Rock, Arkansas 72201 General Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 Mr. William Johnson U.S. Nuclear Regulatory Commission P. O. Box 2090 Russellville, Arkansas 72801 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road
-Bethesda, Maryland 20014 Mr.NicholasS.Feynolds Debevoise & Libermin 1200 17th. Street, PU Washington, DC~ 20036 Arkansas Tech University Russellville, Arkansas 72801 Honorable Ermil Grant Acting County Judge of Pope County Pope County Courthouse Russellville, Arkansas 72801 U. S. Environmental Protection Agency Region VI Office ATTN: EIS COORDINATOR 1201 Elm Street First International Building Dallas, Texas 75270
- i Enclosure to ltr. dtd. 6/9/81 REQUEST FOR ADDITIONAL INFORMATION
-ANO #1
SUBJECT:
ADEQUACY OF STATION ELECTPIC DISTRIBUTION SYSTEM VOLTAGES
REFERENCES:
(1) NRC letter (W. Gammill) to all power reactor licensees, dated August 8, 1979.
(2) AP&L letter (D. C. Trimble) to NRC (R. W. Reid),
dated May 21, 1979.-
(3) AP&L letter (D. C. Trimble) to NRC (R. W. Reid),
dated July 12, 1979.
(4) AP&L letter (D. C. Trimble) to NRC (R. W. Reid),
dated August 24, 1979.
l.
Submit the lowest low voltage (less than 480 volts) Class 1E equipment terminal voltages (P.ef.1, Guideline 7) for the following cases:
(a)
Ref. 2, Table 4, provides the transient and steady state voltages for a full house transfer of Unit 1 station loads to SUT #1 followed by an ES signal with all three 500KV lines out of service.
i (b)
Ref. 3, Attachment 1, provides the Class lE load voltages for maximum grid and minimum plant loading conditions.
(c)
Starting of the largest non-Class lE load following a full house transfer with an ES signal for the worst case analyzed.
Discussion: The above low voltage values are required to verify that the low voltage Class lE equipment will be operating within the design voltage ratings (without blowing fuses, e,.erheating, etc.) and that the voltage dip caused by the large non-C1sta lE load starting will not cause Class lE
.ontactors to drop out.
2.
Ref. 1, page 2, also requested that the voltage analyses be verified by test.
Submit a description of the test method and the test results.
Discussion: The basis for the verification is to confirm the validity of the analytical voltages submitted. The test method should include a comparison of actual measured voltages to analytical voltages to produce a deviatisa error percentage. The test should be conducted with the Class lE buses at least 30%-40% loaded.
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