ML19318C382

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LER 80-028/99T-0:on 800624,during Beginning of Core Life, Hot Zero Moderator Temp Coefficient Found More Positive than Required.Caused by Positive Moderator Temp Coefficient Discovered During Startup Physics Testing
ML19318C382
Person / Time
Site: North Anna Dominion icon.png
Issue date: 06/26/1980
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318C366 List:
References
LER-80-028-99T, LER-80-28-99T, NUDOCS 8007010415
Download: ML19318C382 (3)
v • d • e


Text

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                                                                                                -3 a ia j ; A value of + 1.39 pcm/ F (1.39 x 10 % AK/K/ F) was obtained after Doppler correction.                                                                                                                   l
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9 !* . b. Virginia-Electric and Power' Company Attachment ~1 North Anna Power Station Unit 2 Page.1 of 2 

               ! Docket No. 50-339 Report No. 80-028/99T-0 POSITIVE MODERATOR TEMPERATURE COEFFICIENT on-6/24/80, analysis of startup physics testing data revealed that' a positive moderator temperature coefficient (MTC) was present for the all rods out, beginning of core life, hot zero thermal power condition.

The finalized data indicated an isothermal temperature coefficient of: 

                -0.630 pcm/*F, which converts to an MTC of +1.39 pcm/*F when corrected for the Doppler contribution (-2.020 pcm/*F), was present with an RCS boron concentration of 1332 ppm. -The rod withdrawal limits illustrated by.the attached figure have been instituted. It is estimated that~a core burnup of 3000 MWD /MTU will be required to restore the MTC to within its limits.

The withdrawal limits will apply throughout the entire first cycle of the unit or until a negative MTC for the ARO configuration is verified by measurement. D 9 J l l 1

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