ML19343C216

LER 76-010/03L-0:on 760401,during Pump Operability Test for Containment Spray Sys 2,torus Spray Valve V-21-15 Failed to Open.Caused by Misaligned Starter Contacts.Contacts Repositioned & Inspected

ML19343C216
Person / Time
Site:	Oyster Creek
Issue date:	04/26/1976
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-76-010-03L, LER-76-10-3L, NUDOCS 8103020481
Download: ML19343C216 (3)

Text

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30 31 32 C A11 GORY Tyr u DOCKET NUVOIR EVENT DATE 01 CON'T l 7 B 57 l

58 l M 59 W60 l0 61 l 5 l 0l-l 0l 2l1 l 9l 60 l 0 l-4 l 0 l 1 l 7 l 6 l RfrORT DATE l0l4l2l6l7lo SS 74 75 tc EVENT DESCR:PTION -

DB l Duriny monthly pump operability test for containment sprav system II. torfis sprav 7 89 o Lu l valve V-21-15 failed to open when a containment spray auto' start signal was  :

7 89

][ l applied. R 7 89 System 1 torus spray valve V-21-18 functioned satisfactorily. The j L *.

Eg l cause was traced to a set of misaligned starter contacts on the 460-V breaker. l 7 09 '

@ l The contacts stere repositioned and inspected. The preventative maintenance L; J

7 09 (Continued belew) mn EU cNE cobf cos."ta.t NT CODE MEr $Na votAToN

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7 89 10 lC' l Kl Tl Bl R l K l l Nl lG l0 l8 l0 l [ NJ ~

11 12 17 43 44 47 46 CAUSE DESOR:PTION

@ l A General Electric Company Model 7700 Line Motor Control Center Breaker failed to j 7 09 o he

[ operate torus spray valve V-21-15 because the starter contacts were cisaligned. j 7 89

@ l The centacts were repositioned and inspected.

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'l METHCO CF SfAIUS  % FOWEA OTHER STATUS DGCOvtHY DISCQvlRY DELCAPTON 1

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11 12 13 bl PEnSONNEL INJURIS NUYBt u Ol' APTON 14 l2 l Z l Zl [ NA 7 89 11 12 J c;;

Probable Con;cquences 1

! NA 7 89 l gg LOSS OR DAMAGE TO FACruTY TvrE OtsCtrPicN 11 9 Wl10 7 09 NA l

00 PUGUCITY

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6L ADDITIONAL FACTOi4S - EVENT DESCRIPTION 3l program will include post-maintenance testing requirements that will insure equip-7 89 DJ

@l rpent operability followinp planned maintenance activities. (Reportable Occurrence 9

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• MORRISTOWN, N.J.07960

• 201-539-6111

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[) Pubhc UtdEes Corposation' ' OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/76-10-3L Report Date April 26, 1976 -. Occurrence Date April 1, 1976 Identification of Occurrence Failure of containment spray system Il torus spray valve V-21-15 to function when called upon to do so. This event is considered to be a 30-day reportchie occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2. Conditions Prior to Occurrence The plant was at steady state powcr with major plant parameters as follows: Power: Core, 1654 MWt Elcetric, 570 !#e Flow: Recirculation, 54.9 x 106 lb/hr Feedwater, 6.11 x 10 6 lb/hr Stack Gas: 6750 pci/sec  ; Description of Occurrence on April 1,1976, while performing the monthly pump operability test for containment spray system II, which was done in conjunction with the quarterly automatic actuation test, it was observed that valve V-21-15 failed to open when a containment spray auto start signal was applied. Normally, the valve opens to admit a recycle flow of cooled water from the discharge of the containment spray system back into the torus via a spray header in the torus vapor space. An operator was dispatched to the notor control center for V-21-15 nnd the circuit breaker overload reset was operated, whereupon' the valve was observed to open. -

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Repo'rtable Occurrence No.- 50-219/76-10-3L . . April 26, 1976 Apparent Cause of Occurrence -

• The cause of the overload trip was traced to a set of misaligned starter contacts on the _460-volt breaker which resulted in intermittently disconnecting one of the three phases feeding electfical power to the valve motor. .This caused a trip of the overloads which immobilized the . valve. It is not known how the contacts became misaligned, but it is suspected that it may have occurred during the annual breaker c1 caning and inspection.

Analysis of Occurrence The failure of valve V-21-15 to_ function is considered to be of minimal significance since system I torus spray valve -V-21-18 functioned satisfactorily. The torus spray which is approximately 150 gpm for each loop is intended to cool the gases which are contained.in the torus vapor space under loss of coolant accident conditions. Failure of this valve to operate resulted in a loss of 1,ystem redundancy. Corrective Action The misaligned contacts were repositioned and inspected. The preventative maintenance program that is being developed will include post-maintenance testing requirements that will insure equipraent operability following planned maintenance activities. Failure D_a_t_a. , GE7700 Line Motor Control Center Breaker 460-volt 3 phase 200 AMP rating [ --$ ' w- :W m *N -'. + Fa w w; -= , y ee m en% *>= + gm v -v e ' .es op +=*Www.-W.* ==W++ .h,w. *z. ---}}