ML19256G046

LER 79-089/03L-0:on 791120,reactor Core Isolation Cooling Turbine Tripped on Mechanical Overspeed During Scram.Caused by Crack in Amphenol Connector to Tachometer Pickup. Connector Replaced

ML19256G046
Person / Time
Site:	Brunswick
Issue date:	12/17/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256G045	List: ML19256G044 ML19256G046
References
LER-79-089-03L-01, LER-79-89-3L-1, NUDOCS 7912270317
Download: ML19256G046 (2)

Text

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LICENSEE EVENT REPORT CONTROL BLOJK: l l l l l l l (PLEASE PRINT OR TYPE A'Lt. REQUIRED INFORMATIONI 0 0l0l-l0l0]@l4l1 11 1 1 @l l l@

7 o i 8 9 l N l LIGENSEE C ! E lCODE E l P l14 1 l@l 15 0 l 0l -l 0lLICENSE 0 NUMBER 25 26 LICENSE TYPE JO $7 CAT $8 CON'T O 1 "'fRCE O

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tw 69 EVENT OATE 74 75 REPORT DATE 7 8 60 61 COCK ET NUveER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 IFollowira a reactor scram, the RCIC turbine tripped on mechanical overspeed following l -

oia tan automatic initiation signal at -38 inches. The HPCI turbine van under clearance _

I o a Iat this time for maintenance. RCIC was reset and manuallv 91 aced into oneration.

i o = 1 Vessel level reached a low of -40 inches.

0 6 0 - l Technical Specification 3.7.4, 6.9.1.9b f l

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7 3 9 COVP VALVE SYSTEU CAUSE CAUSE CODE CODE SUSCOCE COMPCNENT COOE SUSCCCE SLS20CE 019 I C l e l@ (Lj@ in l@ I I Nl s l T I R l u l@ I x l@ Lzj @ 18 19 23 7 8 9 to 11 12 13 OCCURRENCE REPORT REVISION

,_ SEQUE NTI AL EVENT YEAR REPORT NO. COCE TYPE N O.

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_ 21 22 23 24 26 27 EFFECT SHUTOOWN ATTAC mv E N T NPR O.4 PAIVE CCMP COYPONENT ACTION FUTURE MANUPACTURER TAKEN ACTION ON PLANT VETHOD HOURS SUSVITTED 80AM dL9. SUPPLIE R LA_J@Ld@ Ld@ l zl@ LO_I010101 I vl@

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3J 34 35 36 3 40 42 43 CAUSE DESCRIPTION AND CORRECT;VE ACTIONS i O IThe e,rm e .n n -espe i n c ,1 1,. ,na er,--nacm- 1 ,.n1 c e n * ,. e 1 When the tu'rbine was  !

i i l-secured. an investigation revealed a crack in the amphenol connector to the tache-eter i 2 l pickup causing a loose connection. The connector was replaced and the clearance on I 3 lthe meenetic oickuo was reset to insure a proper fit. RCIC turbine speed control was j i

i 4 1 (continued) 1 80 7 8 9 S  % POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION ST 1 5 Clh 0l010lh!" '*

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AC Tiv.TY CO$ TENT AELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 7

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• A- = l L'_LJl010l0l@l 7 6 3 11 12 80 LOSS Of OR O AMAGE TO F ACILITY ggl

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l f f n,a r i< >N M [1 @l 7 8 9 10 N/A l 68 69 ll lll1l1ll 1Il 80 A- I- Toll 4An"- fr- PHONE: (0l9I 497 0921 -

NAME OF PREPARER

LER CONTINUATION 79-89 FACILITY: BSEP Unit Nc. 1 EVENT DATE: 11-20-79 tested satisfactorily at 100 psig and 1000 psig reactor pressure during the subsequent start-up. The Unit 2 RCIC connection was checked and found satisfactory.

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