ML20024G573
| ML20024G573 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 09/05/1973 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102120684 | |
| Download: ML20024G573 (2) | |
Text
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Distribution M cket File AEC PDR k'
D I-Local PDR RP Reading Branch Reading Docket ho. 50-2 fs 3 JRBuchanan, ORNL DJSkovholt, L:0R TJCarter, L:0R ACRS (16)
R0 (3) ocC Northern State: Power Cowany VStello ATIN:
Mr. L. O. Mayer. Director JMHendrie of Nuclear Support Services DLZiemann 414 Ficollet Hall RWReid Minneapolis, Minnesota 55401 JJshea RMDiggs Gentlemen:
You were informed by the Regional Director of Regulatory Operations on July 26, 1973, of the possibility that your control rods fabricated by the General Electric Company may have inverted poison tubes. You have completed requested shutdown reactivity margin measurements to accure an adequate shutdown marEin existed at the time of the measure-mento. We are continuing our review of thir, occurrence and have con-cluded that insufficient data exists to conclude that further poison redistribution cannot occur. Therefore, you are requested to submit.
the following, informtion f or our review:
(1) analyscs of possible icngth and location of poison voids which could be caused by boron carbide redistribution, (2) the effect of such redistribution on normal operation, transients, and accidents, (3) proposed changes to technical specifications which will assure that all safety margina stated or implied in your FSAR are maintained, (4) surveillance require-ments to maintain adequate shutdown reactivity margins and monitor changes in poison distribution, (5) your plans and schedules for chsogeout of control rods, and (6) e peted curve of reactivity vs burnup for remainder of current operating cycle.
Copies of the Reactor Control Blade Evaluation' special report and supplement submitted by The Millstone Point Company along with our reply and safety evaluation are enclosed to serve as guidanea in the preparation of your submittal.
It is requested that any proposed 9102120684 730905 PDR ADOCK 05000263 p
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changes within your Technical Specifications to accoent for poison redistribution in inverted poison tubes he implamanted upon submittal pending completion of our review of your proposed ebenges. Your response is requested within 30 days as three signed and thirty-seven additional copies.
y Sincerely, 1
Original Signed by D. J. Dovholt Donald J. Skovholt Assistaat Director for Operating Reactorc j
Directorate of Licensing
Enclosures:
1.
Millstone 1tre dtd 7/23 h 7/26/73 t.rt.nstit.t.in;.1;cactor Control Lladt Evaluatier. and Supplement l
2.
ALC ltr to Millstone dtd 7/27/73 and Safety Evaluation l
cc w/ enclosures:
Donald E. Helson, Esquirc Warren R. Lawson, M.D.
YP and CC Secretary & Emacutiva Officer Northern States rover Company State Department of Health Gerald Charnoff Environmental Library of Minnesota Shaw, Pittman, Potts, Trowbridge and Madden i
llovard J. Vorcl, Esquire Enittle & Votc1 j
Steve Gadler, P. E.
i Barrintt Lansing, Esquire Assistant City Attorney City of St. Paul i
Ken Drugan L
Minnecote Pollution Control Agency i L:0RB #2 L:0 L:P L:TP, orr a, 'L:0RB #2 PMke1 dis % }[3,g7 5"~~ g,RB #2 " %
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