ML19257B857
| ML19257B857 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/03/1980 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8001210074 | |
| Download: ML19257B857 (3) | |
Text
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January 3,1980 Docket No. 50-368 Mr. William Cavanaugh, III Vice President, Generation and Construction Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203
Dear Mr. Cavanaugh:
As we advised you in our October 26, 1979 letter relating to containment purge and vent valves at Arkansas Nuclear One, Unit No. 2, our review of the long term aspects of this issue is continuing. We are reviewing the electrical override / bypass aspects of ANO-2 containment / isolation system and in order to complete our review, you are requested to provide information shown in the enclosure.
Please provide the requested information within 45 days of receipt of this letter.
Sincerely,
//b.h ll Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
As stated cc: w/ enclosure See next page 1773 146 f
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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 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, Fbore & 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 1773 147
Enclosure REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR ARKANSAS NUCLEAR ONE, UNIT 2 DOCKET NO. 50-368 1.
Please discuss how your design confoms with each of the following criteria:
1 - The overriding
- of one type of safety actuation signal (e.g., radiation) should not cause the blocking of any other type of safety actuation signal (e.g., pressure) to the isolation valves.
2 - The bypass controls should have sufficient physical features to facilitate adequate administrative control. Describe the inherent features provided for your emergency core cooling systems. Where physical features are not present, state your intention to include these features.
3 - System level annunciation shall be made when a bypass is active.
Describe your provisions for annunciation when a emergency core cooling system is bypassed.
If annunciation is not provided at the system level, state your intention to include these features.
4 - Diverse signals should actuate closure of the containment isolation valves. Specifically, a minimum of (1) containment high radiation, (2) safety injection actuation, and (3) containment high pressure are required. All of these signals should be derived from safety grade equipment. Your system apparently acts only on high containment pressure. Justify your present design or describe your intentions to correct these deficiencies.
5 - The instrumentation and control systems provided to initiate containment isolation should be designed and qualified as safety-grade equipment.
6 - The overriding or resetting
- of the isolation actuation signal should not cause the automatic reopening of c.?
lation/
o purge valve.
2.
Provide the schematic drawing of your purge and vent system.
- The following definitions are given for clarify of use in this issue:
Override - the signal is still present, and it is blocked in order to perform a function contrary to the signal; Reset - the signal has come and gone, and the circuit is being cleared to return to the normal condition.
1773 148