ML17228B574

LER 96-003-00:on 960625,SITs Discharge Valves Procedurally Isolated in Mode 4 Due to Personnel Error.Issued Night Order to Licensed operators.W/960724 Ltr

ML17228B574
Person / Time
Site:	Saint Lucie
Issue date:	07/24/1996
From:	Lavelle S, Stall J FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-96-183, LER-96-003-02, LER-96-3-2, NUDOCS 9608020135
Download: ML17228B574 (7)

Text

CATEGORY REGULAT RY INFORMATION DISTRIBUTION SYSTEM (RIDS)

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'CCESSION NBR:9608020135 DOC.DATE: 96/07/24 NOTARIZED: NO DOCKET FACIL:50-389 St. Lucie Plant, Unit 2, Florida Power & Light Co. 05000389 AUTH. NAME AUTHOR AFFILIATION LAVELLEPS. Florida Power & Light Co.

STALL,J.A. Florida Power & Light Co.

RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 96-003-00:on 960625,SITs discharge valves procedurally isolated in Mode 4 due to personnel error. Issued night order to licensed operators.W/960724 ltr.

DISTRIBUTION CODE: ZE22T COPIES RECEIVED:LTR C ENCL TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.

! SIZE:

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL 0 PD2-3 PD 1 1 WIENSPL. 1 1 INTERNAL: ACRS 1 1 A RAB 2 2 AEOD/SPD/RRAB 1 1 FI CENTER 1 1 NRR/DE/ECGB 1 1 DE EELB 1 1 NRR/DE/EMEB 1 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 1 NRR/DRCH/HOLB 1 1 NRR/DRCH/HQMB 1 1 NRR/DRPM/PECB 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 1 D

EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 2 2 NOAC MURPHYPG.A 1 1 NOAC POORE,W. 1 1 0 NRC PDR 1 1 NUDOCS FULL TXT 1 1 U

N NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM OWFN 5D 5(EXT 415 2085) TO ELIM AT YOUR NAz!E FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 26

Florida Power 5 Light Company, P.O. Box 12S, Fort Pierce, FL 34954-012S July 24, 1996 L-96-183 10 CFR 50.73 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Re: St. Lucie Unit 2 Docket No. 50-389 Reportable Event: 96-003 Date of Event: June 25, 1996 Safety Injection Tanks Discharge Valves The attached Licensee Event Report is being submitted pursuant to the requirements of 10 CFR 50.73 to provide notification of the subject event.

Very truly yours, J. A., Stall Vice president St. Lucie Plant JAS/SL Attachment cc: Stewart D. Ebneter, Regional Administrator, USNRC, Region II Senior Resident Inspector, USNRC, St. Lucie Plant 9'60S020135 960724 PDR ADOCK 05000389 S PDR an FPL Group company

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NRC FORM 366A U.S. NUCLEAR REGULATORY COMMSSIO I4-96I LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION YEAR SEQUENTIAL REVISION ST. LUCIE UNIT 2 05000389 2 OF 4 96 003 000 TEXT (lfmora speceis required, use edditionel copies of NRC Form 366Ai I17I Technical Specification 3/4.5.1 addresses safety injection tank (SIT) (EIIS:BQ) operability requirements for Mode 4 with reactor coolant system (RCS) (EIIIS:AB) pressure less than 276 psia. Unit 2, Normal Operating Procedures 2-0030127, Reactor Plant Cool-down-Hot Standby to Cold Shutdown and 2-0030121, Reactor Plant Heatup-Cold Shutdown to Hot Standby direct the discharge isolation valve of each required SIT to be closed and deenergized when in Mode 4 and RCS pressure is less than 276 psia. The pressure maintained in the SITs in Mode 4 with RCS pressure less than 276 psia is a minimum of 220 psia. The Technical Specification allows the SITs to be isolated but not rendered inoperable. It is desirable to isolate the SITs to ensure that the tanks would not discharge the nitrogen cover gas into the RCS. The design bases assume the SIT discharge isolation valves reopen in the unlikely event the RCS increases in pressure.

Contrary to this, the valves were deenergized rendering the automatic open feature inoperable.

This discrepancy is applicable to Unit 2 only.

In accordance with the procedures, the discharge valves of the SITs are closed by the operators as RCS pressure is being reduced during the shutdown evolution. In addition, the procedures directed opening the breakers for each of the valves thus rendering the SITs inoperable. There is an interlock which will not allow the SIT discharge valves to be closed above 276 psia and an interlock that automatically opens the SIT discharge valves when RCS pressure reaches 500 psia. The valves are designed to open when RCS pressure reaches 500 psia and/or a Safety Injection Actuation Signal (SIAS) (EIIS:JE) is initiated.

It was found that the procedures have directed the isolation and removal of power to the SIT discharge valves since the issuance of the operating license for St. Lucie Unit 2. Due to this procedural error, the requirements for Mode 4 operability of the SITs have not been complied with on each cool-down and heat-up for refueling and maintenance activities since initial startup.

The cause of the event was personnel error resulting in a discrepancy between the identified plant procedures and the Technical Specification for SIT operability while in Mode 4, The applicable operating procedures have directed the isolation of the SITs and removal of power to the discharge isolation valves since Revision 0 (approved in May 1982). As such, the discrepancy is a result of cognitive error in the implementation of Technical Specification 3.5.1 and the footnote (asterisk) statement concerning Mode 4 operation, specifically, "In MODE 4 with pressurizer pressure less than 276 psia, the safety injection tanks may be isolated." The process for review of new procedures and subsequent periodic reviews in effect since the initial writing of the applicable procedures did not adequately capture the Technical Specification requirements for Mode 4 operation.

NRC FOAM 366A I4-95)

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