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

Dear Mr.O'Reilly:

ld-335 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,~,g.~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)

CONTROL BLOCK: ,1 UCENSEE UCENSE NUMBEA 0-0 0 0 0 0 e F L S L S 1 0 89 14 15 0 0 f PLEASE PRINT ALL REOUIRED INFORMATION)

LCENSE EVENT TYPE TYPE 4 1 1 1 1~03 26 30 31 32 REPORT REPORT CATEGORY TYPE SOUACE i 00NV~8 57 58 59 60 68 69 OOCKET NUMBEA EVENT OATE AEPOAT OATE 0 0 61~'4 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 an el tri ed at 49.1 inches and a second channel tri ed at 50.25 inches.'he set-8 9 60 6 pints were ad usted to brin them within s ecification Technical S ecification 3.3.2.1 8 8 COOS COO E~ZS~E 1 8 9 10 11 12 CAUSE OESCRIPTION COMPONENT COOE N S T R U~N 17 43 S 1 8 5 47 80 The cause a ears to hav been instrument drift.More fre uent testin of these instru-8 9 60 ments has shown no si nificant anomalies.

If an roblem is found in the future the 8 9 80 instruments will be re laced, the old instruments will be evaluated, and a followup LER 89 OTHER STATUS NA AMOUNT OF ACTIVITY NA FACILITY STATUS%POWER~E~ip 0 8 9 10 12 13 FOAM OF ACTIVITY CO A TENT RELEASEO OF RELEASE LzJ hJ PERSONNEL EXPOSURES NUMBER TYPE 0ESCAIPTKlN

~oo 0~z 89 11 12 13 PERS'ONNEL IN JURIES NUMBER 0ESClVPTION 0 0 0 8 9 11 12 ROBABLE CONSEQUENCES

'ETHOO OF OlSCOVEAY B 44 45 46 44 45 NA 80 OICOVERY OESCAIPTlON NA 60 LOCATCN OF RELEASE NA 60 80 89 LOSS OR OAMAGE TO FACILITY'TYPE OESCAlPTlON g~z 89 10 PUBUCITY 89 NA NA 60~60 AOOITIONAL FACTORS I]See a e two for continuation of Event Description and Cause Description.

89 80 89 M.A.Scho PHDNF.(305)552-3802 80 REPORTABLE OCCURRENCE 33-77-32 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.