ML18110A875

LER 1977-335-32 for St. Lucie, Unit 1 on Refueling Water Tank Level Setpoint Drift

ML18110A875
Person / Time
Site:	Saint Lucie
Issue date:	08/31/1977
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/IE
References
LER 1977-335-32
Download: ML18110A875 (3)

Text

P. O. BOX 013100, MIAMI, FL 33101

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FLORIDA POWER & LIGHT COMPANY August 31, 1977 ld -335 Nr. James P. O'Reilly, Director, Region Office of Inspection and Enforcement II U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 1217 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-77-32 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: AUGUST 1, 1977 REFUELING WATER TANK LEVEL SETPOINT DRIFT The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9 to provide 30-day notification of the subject occurrence.

Very truly yours,

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D. Schmidt Vice President Power Resources MAS/cpc Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3)

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CONTROL BLOCK: fPLEASE PRINT ALL REOUIRED INFORMATION)

,1 UCENSEE LCENSE EVENT UCENSE NUMBEA TYPE TYPE F L S L S 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~03

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89 14 15 26 30 31 32 REPORT REPORT CATEGORY TYPE SOUACE OOCKET NUMBEA EVENT OATE AEPOAT OATE i 00NV 0 0 8 57 58 59 60 61 ~

68 69 75 80 EVENT OESCRIPTION Durin routine testin , 2 of the 4 "Refueling Water Tank Low" instrumentation channels 89 80 for initiation of containment sum recirculation were found to have set oints sli htl 8 9 80 out of tolerance. The set oints should have been "48 inches above tank bottom" but one 8 9 80 el tri at 49.1 inches and a second channel tri ed at 50.25 inches. 'he set-

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an ed 8 9 60 6 pints were ad usted to brin them within s ecification Technical S ecification 3.3.2.1 8 8 80 COOS COO E COMPONENT COOE

~ZS ~E 1 N S T R U ~N S 1 8 5 8 9 10 11 12 17 43 47 CAUSE OESCRIPTION The cause a ears to hav been instrument drift. More fre uent testin of these instru-8 9 60 8 9 FACILITY ments has shown no si nificant anomalies. If an roblem is found in the future the 80 instruments will be re laced, the old instruments will be evaluated, and a followup LER 89 80

'ETHOO OF STATUS  % POWER OTHER STATUS OlSCOVEAY OICOVERY OESCAIPTlON 8

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12 13 NA 44 B

45 46 NA 60 FOAM OF ACTIVITY CO ATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATCN OF RELEASE LzJ hJ NA 44 45 NA 60 PERSONNEL EXPOSURES NUMBER TYPE 0ESCAIPTKlN

~oo 0 ~z NA 89 11 12 13 PERS'ONNEL INJURIES NUMBER 0ESClVPTION 0 0 0 8 9 11 12 80 ROBABLE CONSEQUENCES 89 LOSS OR OAMAGE TO FACILITY'TYPE OESCAlPTlON g ~z NA 89 10 60 PUBUCITY NA 89 ~ 60 AOOITIONAL FACTORS I] See a e two for continuation of Event Description and Cause Description.

89 80 89 80 M. A. Scho PHDNF. (305) 552-3802

REPORTABLE OCCURRENCE 33 32 LICENSEE EVENT REPORT PAGE TWO EVENT DESCRIPTION (Continued)

This was the first occurrence of this type at St. Lucie Unit l.

(335-77-32)

CAUSE DESCRIPTION (Continued) will be submitted. Also, since the actual RWT level is always maintained at least one foot higher than the minimum required by Technical Specification 3.5.4, a recirculation phase setpoint drift of 2.25 inches poses no significant safety consideration from the standpoint of water volume available in the RWT prior to recirculation.