ML19308D058

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Discusses B&W Rept,In Response to NRC 800109 Ltr.Agrees W/Rept Conclusion That No Voiding Occurs in RCS During Anticipated Transients.No Data Found to Support Proposed Voiding Phenomena
ML19308D058
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 02/15/1980
From: Trimble D
ARKANSAS POWER & LIGHT CO.
To: Reid R
Office of Nuclear Reactor Regulation
References
1-020-12, 1-20-12, NUDOCS 8002260697
Download: ML19308D058 (1)


Text

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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. AnKANSAS 72203 (501) 3714000 February 15, 1980 1-020-12 Director of Nuclear Reactor Regulation ATTN: Mr. R. W. Reid, Chief Operating Reactors Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 f

Subject:

Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51 RCS Voiding During Normal' Transients on B&W Plants (File: 1510)

Gentlemen:

Your letter of January 9,1980, on this subject has identified a possible concern that void formation may be taking place in the hotter regions of the reactor vessel during nonnal operating transients. This issue was first addressed during a telephone conversation between the staff and B&W in November,1979, and subsequently documented in the subject letter along with a request for us to evaluate the validity of this suspected concern.

Following the November telephone conversation, B&W reviewed the data from the transients referenced by the ISE Inspector and, as a result of further investigation, prepared the attached report as a response. The results of the investigation do not support the inspector's contention and concludes that voiding does not occur in the reactor coolant system during antici-pated transients.

Arkansas Power & Light Company has reviewed B&W's report and agrees with their conclusion. We have also reviewed the available AN0-1 transient data and have not found data to support the proposed voiding phenomena.

We found the data provided with your letter of January 9,1980, to be incomplete and of poor quality, and we could not identify the specified transient characteristics. We could find :q data on what we consider an important parameter in explaining a transient characteristic of this type, e.g. Makeup flow rate. Therefore, no explanations or anal, cal predictions could be provided.

Again, Arkansas Power & Light Company is convinced that void fonnation does not occur during normal operating transients.

Very truly yours, bCWUtf C. T David C. Trimble Manager, Licensing .

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