ML18113A290

LER 1976-047-00 for St. Lucie Unit 1, Steam Driven Auxiliary Feedwater Pump Would Not Start Because Trip Solenoid Latch Failed to Engage

ML18113A290
Person / Time
Site:	Saint Lucie
Issue date:	01/07/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-77-8 LER 1976-047-00
Download: ML18113A290 (6)

Text

U.S. NUCLEAR REGULATORY JIMISSION DOCKET NUMIIEB NRC roBM 195 (2. 70)

FILE NUMBER NRC DISTRIBUTION roR PART 50 DOCKET MATERIAL 'NCIDENT REPORT TO: Mr N C Moseley. "" M'lorida Power 6 Light Co DATE OF DOCUMENT 1"7 Miami, Fla A D Schmidt DATE RECEIVED W

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DESCRIPTION i ~

Ltr trans the following: Licensee Event Report (ROC 335-76-47) on 12-8 76 concerning failure of steam driven auxiliary feedwater pump'due to buildup of moisture in a control box......

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PLANT NAME: St L i y] ~'>a~

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W CYS ACRS CYS RHKRC~i S NT INTERNAL D IST R I BUTION NRC PDR XS,E (2 MXPC SCHROEDER/XPPOLITO HOUSTON NOVAK/CHECK GRIMES CASE BUTLER HANAUER TEDESCO/MACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR: gore@

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N~C. //Co1 N BC I'0 BM 190 {2 70)

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P.O. BOX 013100, MIAMI, FL, 33101 FLORIOA POWER & LIGHT COWIPANY January 7, 1977 PRN-Lr-77-8 1

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Mr. Norman C. Moseley, Director, Region II Q7 Office of Inspection and, Enforcement U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 1217

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Atlanta, Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-76-47 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: DECEMB R 8, 1976 STEAM DRIVEN AUXILIARY FZEDnAT>ER PUMP The attached Licensee Event Report is being submitted with Technical Specificat'on 6.9 to provide.30-day in,'ccordance notification of the subject occurrence.

Very truly'yours, gpCggtD IICIIRC D. Cllmidt Vice President IVIII'7 1~1 Resources 5

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Director, Office of Man~agement Information and Program Contxol (3)

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LICENSEE EVENT REPORT CONTROL BLOCK: ~EASE PRINT ALL REQUIRED Ili!IFORMATIGH)

E 1 6 UCcNSEc i LICENSE EVENT NAhIE LICENSE NUMBER TYPE TYPE

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7 89 14 15 25 26 30 31 32 RcPOA i REPORT CATEGGAY OOCKET NUMBER EVEN~ GATE REPORT GATE Ioa~jcoNo 0 5 0 0 3 3 5 1 2 0 8 7 6 0 1 0 7 7 7 7 8 57 58 c9 60 68 69 ~

74 75 80 I

EVENT OESCRIPTION 7

t0021 8 9 f dwater um would not s'tart because the tria80 solenoid latch failed to en a e. U on ins ection, a moisture induced I

7 89 60 tOD4] corrosion dectosit was found on the latch mechanism. The mechanism'was 7 8 9 80 cleaned and lubricated and the um was tested satisfactoril in all 7 8 9 eo gg modes of ooeration. This was the third occurrence durin which the steam 7 8 9 PAMC 80 SYSTEM CAUSc CCMPCNENT CCMPGNB4T CGGE COGc COMPONENT COOE SUFPUER MANUFACtl.'PM

~B ~VA IL ~VX X ~A L 2 0 0 7 8 9 10 11 12 17 43 47 48 CAUSE OcESCRIPTION t00g The steam driven auxiliar feedwater um did not start; because of moistur 7 8 9 Eo ui l ." a con .~yl h I Th moisture caused corrosion of th trio 7 8 9 80 Qg solenoid latch mechanism which revented the latch from en a in 7- 89 80 FACBJTY METHGO CF STATUS lt POWER OTHER STATUS OISCOVcAY OISCOVEAY OESCRIPTIGN Qg A ~00 oi I N/A N/A 7 8 9 10 12 13 44 45 46 EO FOAM OF ACTMTY CQATBJT PCLEASCQ OF RELEASE AMOUNT GF ACTIVITY LOCATION GF RELEASE

~12 Z Z ii/A N/A 7 8 9 10 11 PERSONNEL EXPOSURES N/A 7 8 9 11 12 13 80 ~

PERSONNEL INJURIES NUMBER 'cSCR!PTICN

~4 ~oo go N/A 7 89 11 12 PO PTlPtlABlilCONSEQUENCES KH N A.

7 8 9 LOSS OR OAMAGE TO FACILITY TYPE GESCR!PTICN z N/A 7 89 10 PUBLICITY N/A 7 69 AOOITIONAL FACTORS Em [ See Pa e Two for continuation of Event Descri tion.

7 6 9 Q~'g 7 09 N. A. Scho man pHONc (305) 552-3779 CPO ddt ddt

Reportable Occurrence 335-76-47 Licensee Event Report Page Two Event Descri tion (Continued) driven auxiliary feedwater pump failed to start because of moisture buildup (see reports 335-76-22 and 335-76-36). Xn addition to further sealing."of the pump control circu'try, nearby steam drains have been rerouted away from the circuitry in order to remove the source of the moisture. A plant change, in accordance with-

'10 CFR 50.59, has bien generated to modify the control circuit so that, the trip solenoid will remain in the latched position follow-ing a pump stop. This should eliminate starting failures related to the trip latch failing to engage (see "eport 335-76-36). Also, surveillance testing has been increased to help ensure proper operation of the steam driven auxiliary feedwater pump.

(335-76-47.)