ML20040G171
| ML20040G171 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/19/1982 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8202110386 | |
| Download: ML20040G171 (3) | |
Text
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!k Docket lio. 50-313 DEisenhut S'y OELD q
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!!r. Ilillian Cavanaugh, III fEj 1
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Arkansas Power & Light Company RIngram s
7 P. O. Cox 551 EBlackmod Little Roch Arkansas 72203
Dear fir. Cavanaugh:
i rn an tie have reviewed your letter dated October 30, 1981, concerning the adequacy of Station Electrical Distribution Voltage Verification test for Arkansas fluclear One, Unit No.1.
You have indicated that the use of General Electric computer code, which has been used in other nuclear facilities, and comparison with a Bechtel "Voltanal" computer code and the use of factory obtained data on transformers and conservative application of plant data provide sufficient margin to offset any error. In addition, you state that the installed relays will provide the required protection to safety related equipment and the cost benefit of the required testing will provide no improveme:0 in safety. Your method of analysis and assumptions may appear to be satisfactory, llowever, we cannot accept the adequacy of the undervoltage relay setting and transfomer tap setting on the basis of calculated voltage values which rely solely upon equipment manufacturers data and which may not reflect actual installed conditions at the plant.
Based on experience at operating reactors, it is the staff's position that plant measurements are the only positive means of verifying that all inputs to the voltage analysis reflect the actual plant equipment and conditions that exist at N!01. Also, without such a test, we consider that there is no assurance that assumptions and data used in the analysis, regardless of how conservatively applied, provide sufficient margin to ensure that a) the distribution system and Class lE equipment will operate satisfactorily at sustained degraded grid voltage limits, and b) that the undervoltage relays, installed at the 430 volt level, will provide the necessary protection for all safety related equipment under all plant conditions.
Our experience with other plants in the review of this multiplant action iten has not revealed any specific hardship being planed on licensees in performing the verification tests.
8202110386 820119 PDR ADOCK 03000313 P
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Mr. William Cavanaugh, III We consider a verification test is essential to assure the adequacy of the undervoltage relay set points to protect the safety related equipment during degraded voltage condition.
We hope that this has adequately explained our position and request your response within 30 days.
3 Sincerely,
'c..Icun smag Ef9 E d fCL V John F. Stolz, Chief Operating Reactors Branch 14 Division of Licensing cc: See ncxt page i
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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 i
Nuclear Power Generation Division Suite 120 7910 Woodcont Avenue Bethesda,' r'ar yland 20814 Mr. Nicholas S. Reynolds Debevoise & Liberman 120017th Street, NU Washington, DC 20036 Arkansas Tech University Russellville, Arkansas 72801 Honorable Ermil Grant Acting County Judge of Pope County Pope County Courthouse Russellville, Arkansas 72801 Regional Radiation Representative EPA Region VI 1201 Elm Street Dallas, Texas 75270 fir. John T. Collins, Regional Administrator U. S. Nuclear Regulatory Commission, Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
.