ML19326C074
| ML19326C074 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/01/1978 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8004180745 | |
| Download: ML19326C074 (3) | |
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.,s Arkansas Power & Light Company CC Phillip K. Lyon, Esquire House, Holms & Jewell 1550 Tower Building Little Rock, Arkansas 72201 Mr. Daniel H. Williams Manager, Licensing-Arkansas Power & Light Company
-Post Office Box 551 Little Rock, Arkansas 72203 Mr. John W. Anderson, Jr.
Plant Superintendent Arkansas Nuclear One Post Office Box 608 Russellville, Arkansas 72801
' Arkansas Polytechnic College Russellville, Arkansas 72801 3 48 e
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REQUEST FOR ADDITIONAL INFORMATION ARKANSAS NUCLEAR ONE-UNIT NO. 1 DOCKET NO. 50-313 CYCLE 3 RELOAD 1.
please provide information on the status of the S&W Setpoint Methodology topical report.
It is important that this report be su to provide the data and information necessary to interpret the Technical Specification changes of plant setpoints.
2.
Please explain the increase in quadrant tilt allowed in the' proposed Tt Speci fications (from 3.4% to 4.92%).
You state that the increase in allowable tilt is a result of an increase in calculated margin, please explain how the allowable tilt is calculated from the margin available and identify how tradeoffs in other core parameters are made to arrive at the allowable tilt.
3.
Please justify allowing your plant to ope' rate with up to a 25% tilt before the plant must be placed in hot shutdown (3.5.2.4.3 on pg. 47 of proposed Technical Specifications).
This appears to be an excessively large tilt and it seems that shutdown should occur well before the tilt reaches this magnitude.
The proposed Technical Specifications state that above 15% power, the 4.
quadrant tilt will be monitored at a minimum frequency of once every two hours. Justify not making the rate of tilt surveillance a function of the magnitude of tne tilt.
It seems prudent that once the tilt exceeds the allowable tilt prior to power reductions, more frequent monitoring of the quadrant tilt should take place.
In the case at hand, Arkansas 1 is allowed a tilt of 4.92% prior to any power reductions and must shutdown only when the tilt reaches 254.
Between these two tilts it appears that the tilt surveillance should increase.
you disagree please justify your selection of monitoring frequency.
If 5.
Paragraph t.1 of your reload submittal stated that"...imoroved test methods (dynamic impact testing) show that the spacer grids have a higher seismic capability..."
and where are they documented? What are these improved test nethods l
,