ML20125B971
| ML20125B971 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/17/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| Shared Package | |
| ML20125B974 | List: |
| References | |
| NUDOCS 8001020341 | |
| Download: ML20125B971 (3) | |
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o UNITED STATES N b f
g y) g NUCLEAR REGULATORY COMMISSION s
a wAssmaron,o c.acess December 17, 1979 Docket No. 50-313 Mr. William Cavanaugh, III Vice President, Generation and Construction Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203
Dear Mr..Cavanaugh:
We have reviewed your proposed design modifications for (1) protection against' sustained undervoltage conditions (The Degraded Grid Voltage Issue) and (2) the abnormal occurrence of September 16,1978, for Arkansas Nuclear One, Unit No.1, (ANO-1) and as it relates to Arkansas Nuclear One, Unit No. 2, (AMO-2).
We conclude that the proposed design modifications are acceptable. How-ever, before the modifications are implemented, we request proposed l
associated Technical Specification changes. -The proposed Technical Specifications should include consideration of all proposed changes and j
testing and calibration of the protective relaying. The following items should particularly be addressed in your proposal:
(1) The fast transfer scheme.
(2)
Interlock to prevent simultaneous connection of both unit ic, ads to startup transformer #2.
(3) Shedding of selected non-lE loads when start-up transformer #2 is the source of off-site power.
(4) ESF loads of both units on start-up transformer #2.
i (5) Sequencing of ESF loads on off-site power.
(6) Preventing load shedding from emergency busses once the diesel generator is the power source and re-instating the load shedding feature when the onsite cource breaker is tripped.
(7) Trip set point for the undervoltage protection, associated time delay, blocking and alarm circuitry.
(8) Testing of both levels of JnderVoltage protection sensors, test frequency and accuracy.
90013317 3 L-fI 8001020 v
l 2-l (9) Testing of emergency power system using the following steps:
1 (a) Simulating a loss of off-site power, (b) Simulating a loss of off-site power in conjunction with an ESF actuation signal, and (c) Simulating interruption of off-site power and subsequent reconnection of the onsite power source to their respective buses.
(10) Testing requirements for items 1 through 7 above.
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Also, we request that all modificaitons be tested successfully before full load operation of ANO-1.
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Our related Safety Evaluation is enclosed.
We understand that you plan -to implement your proposed modifications during
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the next refueling outage which is sgheduled for November 1980. However,
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if you have an outage of' sufficient duration before your next refueling outage, we request that your proposed Technical Specifications be submitted at least 30 days before implementation of the modifications but no later than 90 days of receipt of this letter. Also we request, with your submittal, your estimated time for completing your modifications.
Sincerely, l
b'lJk; Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors l
Enclosure:
'-f Safety Evaluation T.
E cc: w/ enclosure See next page 90013518 1
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1 Arkansas Power & Light Company cc:
Phillip K. Lyon Esq.
House, Holms & Jewell 1550 Tower Building Little Rock, Arkansas 72201 Mr. David C. Trimble Manager, Licensing Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203 Mr. James P. O'Hanlon General Manager Arkansas Nuclear One P. O. Box 608
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Russellville, Arkansas 72801 Mr. William Johnson U. S. Nuclear Regulatory Connission P. O. Box 2090 Russellville, Arkansas 72801
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Mr. Robert B. Borsum Babcock & Wilcox
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Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Troy B. Conner, Jr., Esq.
Conner, Moore & Corber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20006 Arkansas Polytechnic College Russellville, Arkansas 72801 Director, Bureau of Environmental Health Services 4815 West Markham Street Little Rock, Arkansas 72201 90013319
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