ML20024G572
| ML20024G572 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 08/14/1972 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9102120683 | |
| Download: ML20024G572 (2) | |
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NSEn NORTHERN STATES POWER COMPANY
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sA MIN N E A PO LI S. MIN N E SOTA S9401 Re,quiatory File Cyi M g' August 14, 1972
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%,,* 3 Mr. A Giatbusco j
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Dear Mr. Giambasso:
MONTICELLO NUCLEAR GENERATI!D FIANT Docket No. 50-263 Licence No. DPR-22 7
Report of a Change in the Transient Analynic A
Ac Described in the PS Ad We are recently in receipt of a reanalysis of the transients dircucced in the PEAR based on the end of cycle conditionc.
Results of the transient analycic are found to differ from those presented in the FSAR. We are, therefore, reporting this in accordance with the provisions of Eection 6.6.C.2 of Appandix A, Technical Epeci-ficationc, of Provisional Operating Licence DPR-22.
The change in the transient responce results from exposure effectc on the relation-The end ship between control rod worth and length of rod inserted in the core.
result is a clover rate of reactivity insertion for the first half of the control rod stroke during a reactor scram.
Thit, phenomenon is baced colely on the spatial distribution of reactivity depletion in the core; experience to date shove thatfoe the mechanical scram time of control rods has remained essentially unchanged.
analysis for the end of cycle conditions was performed based on control rod scram insertion times taking credit for a clightly faster initial insertion rate than currently allowed by our Technical Specifications.
Resulto of the analynic pre-
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dict that the reactor responds safely for all assumed transients, h
Safe operation of the Mcnticello reactor continuer in light of the new transient analysis. We are approximately in tne middle of our first cycle; the need for the new analysis is based on end of cycle conditions.
To date, the measured scram times of our control rods are approximately half of those presently allowed by the Techni-cal Specifications and likewise those uced for the new trancient analysic.
We vill submit a report of the analysic along with proposed changes to our Technical Specifications in the near future.
It nppears that no changee in plant equipment or j
operational requirements are needed as a result c: the new transient analysis.
Yours very truly, M O.
L 0 Mayer, P.E.
Director of Nuclear Support Servicec LOM/MHV/br cc:
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DATE OF DOC:
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40 50-263 DESCRIFIION: Ltr submitted as a report ot a ENCLOSURES:
A change in the Transient Analysis as described m. m tee rsia........
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FLANT NA!GS:
Montiecello Plant FOR ACTIO:i/lNFORMATION
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