ML19254D161
| ML19254D161 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/04/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7910220454 | |
| Download: ML19254D161 (2) | |
Text
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UNITED STATES
[ t,- J j NUCLEAR REGULATORY COMMISSION
.;\\ TN/. E WASHINGTON, O. C. 20555
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October 4,1979 Cccket No. 50-313 Mr. William Cavanaugh, III Vice President, Generation and Construction P. O. Sox 551 Little, Rock, Arkansas 72203
Dear Mr. Cavanaugh:
We have reviewed your submittal cated December 22, 1977, which was a response to our letter dated September 15, 1977, concerning a possible baron dilution incident at Arkansas Nuclear One - Unit 1.
Your submittal only addresses the potential of one event other than the boren dilution incident that could cccur by inadvertent draining of spray additive tank to the reactor coolant system as happened at Crystal River.
In order to complete our review, provide the identification of all cther potential boren dilution accidents which you have evaluated and which are not analy:ed in the FSAR. Provide the consequences of the baron dilution accidents so identified.
You have identified a potential mode of boren dilution that could occur when filling the refueling canal by way of the icw pressure injection system if a single failure is postulated concurrently with the testing of the NaOH control valves. To eliminate tnis potential mode of boron dilutien due to single failure, you have cnanged operating procedures requiring tne closing of valve CA49 in addition to valves CA61 and CA62.
Provide the piping and instrumentation drawings which will show the location of those valves and which will verify that closure of CA49 will provide redundant isolation of the NaOH Storage Tank from the reactor coolant system.
You are requested to provide a response to the above requests within 30 days.
Sincerely, m
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Robert W. Reid, Chief C:erating Reactors 3 ranch #4 Division of Operating Reactors cc: See next page 2
192 7910 2 2 0 f
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Arkansas P0wer & Light Company cc:
Phillip K. Lycn, Esq.
House, Holms & Jewell 1550 Tower Building Little Rock, Arkansas 72201 Mr. Cavid C. Triebie Manager, Licensing Arkansas Pcwer & Light Company P. O. Box 551 Little Rock, Arkansas 72203 Mr. James P. O'Hanlon General Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 Mr. William Johnson U. 5. Nuclear Regulatory Comissicn P. O. Box 2090 Russelly lle, Arkansas 72301
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- g 4 Mr. Ecbert 3. Sorsum e
Babecck & Wilc0x k'g\\I Nuclear Poner Generation Division Suite 420, 7735 Old Georgetown Road
'g Se:nesda, Maryland 20014 Troy 3. Conner, Jr., Esq.
9'w Ccnner, Mcore & Corber 1747 Pennsylvania Avenue, N.'n.
Wasnington, D.C.
20006 Arkansas Polytechnic College Ru:.sellville, Arkansas 72801 4
2 193
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