ML20049A807

LER 81-020/03L-0:on 810821,during Normal Operation,Control Rod G-3 Dropped Into Core,Initiating Turbine Runback.Caused by Spray from Leaking Plug Needle Valve on Control Rod H-2, Causing Coil Stack Connector to Fault.Connector Repaired

ML20049A807
Person / Time
Site:	Indian Point
Issue date:	09/21/1981
From:	Mooney J CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20049A790	List: ML20049A789 ML20049A807
References
LER-81-020-03L, LER-81-20-3L, NUDOCS 8110020282
Download: ML20049A807 (1)

Text

NRC FORM 36G (f. S. NUCLE AR (Mik2ULAG@DU cm sstoN (7 77)

. LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL BLOCK: l 1

l l l l l lh 6

[@ lN l Y l Il P l Sl 2 l@l 0 l 0l 0l 0 l 0l 0 l 0l 0 l 0l 0 l 0l@[ 4 l1 j_1l 1l 1}@lb/ l L. A l bo lg 7 8 9 LICEF.SEE CODE 14 15 UCENSE NUMBER 24 2ts U ffA 1YPE Je

, COTT lolil [R"', I L l@l 0 l5 l0 l 0] 0l 21 417 68 @l 018 69 l 2 l JI 8 l 1l@lREPOH EVENT DATE 74 15 VlT D9ATlE 2l 1H0 l P l 1l@

i 8 60 61 DOCK ET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 IDuring normal operation, control rod G-3 (Shutdown Bank B) dropped into After.

, o ,3 ; lthe core, initiating a turbine runback to approximately 70% power.

[ng.,;[ steps were taken to stabilize the plant, operator attempts to retrieve i o 3 lthe rod were unsuccessful. Quadrant power tilt calculations were made

ois;land a power reduction to 50% began. During a hold in the power reduction 10 l 71 la sudden drop in generator load caused a reactor high pressure trip.

I O lH l lSimilar Event RO-77-2-13(B).

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE IU8 CODE COrdLNENT CODE hv8 CODE SUBCODE by lR l B l@ l El@ lA l@ l C lO ); lR l OlD l@ ]@ ]@

12 18 19 20 7 8 9 10 11 13 SEQUENTIAL OCCUR R E NCE REPORT REVISION EVENT YE AR REPORT NO. CODE TYPE NO.

LE R RO O REP,g l-l l 0 l2 l 0l y l 0l3 l l Ll l-l l 0l

_ l218l1l 22 23 24 26 27 28 29 30 31 32 T KEN AT

• ON PLANT MET HOURS 22 SS IT D FO BOB, S plt MAN FA T E:

lB lg{34g l5Blg 3 l% A[@ l 0 l 0l0 l 37 l

40 g g J g 41 42 g h 43 lWl1 44 l2l0-JJ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l 0 l LInvestigation revealed that the vent plug needle valve on control rod H-2.

lqi,;lwas -

r leaking. .-A spray on rod G-3 coil stack cn uector caused the connector

,,,,jj

'to fault and the rod to drop.

The connector was repaired and the vent cap Problems with the turbine high pressure oil system were i },,3y]sealwelded. ,

,, y ,i l determined to have caused the second drop in generator load; repairs were ,

i 7 8 9 made.

5TA S  % POWER OTHER STATUS Dl5 OV RY DISCOVERY DESCHIPTION 32

[TTs1 LEj@ l ll0l0l@l N/A l l A l@l Control Room Instrumentation l A TIVITY CO TENT RE LEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION 04 RELEASE i i l 6 l l_Zj @ { Z_J@l N/A l l N/A l 7 8 9 to 11

• 44 45 $J PERSONNE L (xPOSURES NUMHE R TYPE DESCRIPTION 1 7 l 0 l 0 l 0 l@[Z j@l N/A l PEnSONNE L iN3u'n'ies_

NuMoER otSCniPTiO 4@

1 H l 0l 0 l 0 l@l N/A l 7 8 9 tt 12 SJ LOSS Or on DAMAGE TO FACILITY TYPE DE SCniPTION Illd "LzJ@l N/A l

" 83 eunuCUrY 8110020282 810921 NRC OSE oNLY '

ISSUE PDR ADOCK 05000247 ,

bhJ LNf@oESCnirTiONh l N/A S PD8 l llllllllllllly 3 8 9 10 68 69 SJ L T,~~~*" James P. Mooney~ ~. 914-526-5181 o

~ ~ h ? PHONE:

~ ~

NAME OF PREPARER 8,

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