ML18110A875

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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FLORIDAPOWER & LIGHTCOMPANY 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,

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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)

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 fPLEASE PRINT ALLREOUIRED 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

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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

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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

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8 9

10 12 13 FOAM OF ACTIVITY COATENT RELEASEO OF RELEASE LzJ hJ PERSONNEL EXPOSURES NUMBER TYPE 0ESCAIPTKlN

~oo 0

~z 89 11 12 13 PERS'ONNEL INJURIES 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 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.