ML17266A029

LER 78-046/03L-0 on 781207:during Power Operation,Control Element Assembly 59 Dropped as It Was Manually Inserted to 100 in Position for Moderator Temp Coefficient Test.Cause Unknown

ML17266A029
Person / Time
Site:	Saint Lucie
Issue date:	01/05/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17206A635	List: ML17206A634 ML17266A029
References
LER-78-046-03L, LER-78-46-3L, NUDOCS 7901290208
Download: ML17266A029 (4)

Text

NRC FORM 268 V. 5 NVCLEAA4 EC VLATORY CCIIIAIISSIOiu P 77)

LICENSEE EVENT REPORT CONTROL BLOCIC: I t I )Qr )PLEASE PRINT CA TYPE At.L AEQVIAEO INFORMATION)

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EV6uT OESCRIPTlo!V 'NO PROSASLS CCVS-OVKuCES +ro n During power operation, CEA 859%ropped. At the time of the drop, the

~o) 3 CEA group containing CEA 859 was in the process of being manual ly inserted to the 100 inch position to establish conditions for a

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~Q) 1'foderator Temperature Coefficient test. Action was taken in accordance with T. S; 3- 1 .3. 1 e and CEA dr59 was restored to its normal pozition with-in the applicable time limit. This was the fourth occurrence of a dropped II CEA for which the cause is not knotm. (See LER 335-77-6, 78-18 78-20) 1 3 SY5TKI4 C l'SE C U5c COUP. yALyc I - 9 '

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The cause of the dropped CEA is not known. No cause could be determined

'or the CZA drop and no other abnormal conditions were found. CEA //59 its

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operated properly when restored to normal position and has performed normally ever since.

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g REPORTABLE OCCURRENCE 335-78-46 LICENSEE EVENT REPORT PAGE TWO Additional Event Descri tion As a result of the reactivity insertion, azimuthal power. tilt (Tq) increased to 0.027, which required action .in accordance with T.S.

3.2.4. Reactor power was reduced and Tq was returned to normal within the applicable time limit. Total integrated radial peaking factor (Prt) and total planar radial peaking factor (Pxyt) did not exceed their applicable limits during the event.

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