ML19256G260
| ML19256G260 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/14/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7912280609 | |
| Download: ML19256G260 (3) | |
Text
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UNITED STATES i 'T e
- 7, NUCLEAR REGULATORY COMMISSION
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December 14, 1979 0:cket No. 50-313 Mr. William Cavanaugh, III Vice President, Generation and Construction l
Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203 l
Dear Mr. Cavanaugh:
We have reviewed your response on Control Room Toxic Gas Protection dated September 15, 1978. Although we consider a chlorine release a low probability l
event at Arkansas Nuclear One - Unit No.1, we have established the position that the control room should have toxic gas protection. We do not concur in your conclusions that the analysis shows the control room would be safety habitable following your postulated release.
The lack of quick-response chlorine detectors in the fresh air intake ducts; the use of nonconservative Pasquill Category A atmosphere dispersion conditions; the reliance on plant emergency procedures calling for the use of a minimum of short gulping breaths during the time it takes to detect chlorine; and the high control room chlorine concentration of 66 ppm (chlorine toxicity limit-15 ppm) are examples of why we do not accept your evaluation.
Because of the potential adverse effects on the public health and safety which could result from incapacitation of control room operators due to a potential clorine release, we request you to commit to the following facility modifica-tions or other acceptable measures to ensure control room habitability following a toxic gas release. We request a commitment to implement the corrective action cefore startup following the next refueling outage.
1.
Install quick-response chlorine detectors in the fresh air inlets.
2.
Isolate control room automatically on high chlorine alarm within 10 seconds.
This is the time interval between the chlorine concentration exceeding 5 ppm at the isolation dampers and the time the dampers are completely closed.
3.
The con rol room isolation air exchanga rate should be reduced frca 3 to 0.06 air changes per hour.
1650 030 7012280
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. We request within 60 days of receipt of this letter your commit. ent, a description of your proposed modifications or your justification for continued operation if you cannot make the requested commitment.
Sincerely, jb'
}l.
A Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors cc: See next page 1650 031
3 Arkansas Power & Light Company.
CC:
Phillip K. Lyon, Esq.
House, Holms & Jeaell 1550 Tower Building Little Rock, Arkansas 72201 l
Mr. David C. Trimble Manager, Licensing Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203 Mr. James P. O'Hanlon i
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 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 1650 032