ML20084D224

Preliminary AO 50-219/74/28:on 740419,motor Operated Suction Valve v-20-4 Failed to Open Electrically After Closing Electrically During Surveillance Testing on Core Spray Sys. Cause Under Investigation

ML20084D224
Person / Time
Site:	Oyster Creek
Issue date:	04/19/1974
From:	Carroll J, Merry J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-28, NUDOCS 8304110009
Download: ML20084D224 (4)

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From: Jersey Central Power 6 1.ight Company Oyster Creek Nuclear Generating Station, Docket #50-219 Forked River, New Jersey 08731 a

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Subject:

Abnormal Occurrence Report No. 50-219/74/28 The following is a p ra l i mi n a ry rapa rt haing n'bmitted in compliance with the Technical Specifications, paragraph 6.6.2.

Preliminary Approval:

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[T. Carroll, Jr. '# Date cc: Mr. A. Giarrhusso/

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L._ _. - a wq Initial Telephone Date of v Report ,Date: 4 /19/74 Occurrence: 4/19/74 Initial Written Time of Report Date: 4/19/74 Occurrence: _

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OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/74/28 IDENTIFICATION Violation of the Technical Specifications, paragraph 3.4. A.1, OF OCCURRENCE:

which requires the core spray system to be operable at all times with irradiated fuel in the reactor vessel, except as specified in Specification 3.4. A.3 and 3.4. A.4. Suction valve (V-20-4) to the "B" core spray pump was stuck in the closed .

position for a period of approximately 15 minutes thereby  ;

causing a loss of core spray pump redundancy in system II. In  :

addition, core spray system I was tagged out of service for ,

maintenance at this time.

1his event is considered to be an abnormal occurrence as de-fined in the Technical Specifications, paragraph 1.15B and D.

CONDITIONS PRIOR Steady State Power Routine Shutdown TO OCCURRENCE: llot Standby Operation Cold Shutdown Load Changes During  :

X Refueling Shutdown Routine Power Operation Routine Startup Other (Specify)

Operation The reactor mode switch was in the REFUEL position with reactor coolant temperature approximately 104 F.

l DESCRIITION At approximately 0715 on Apri.1 19,1974, while performing sur-0F OCCURRENCE:

veillance testing on core spray system II, motor-operated valve V-20-4 failed to open electrically after having closed cicctrically in a normal manner. This surveillance testing was being performed

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Raport No. 50-219/74/28 Page 2

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on core spray system II after system I was tagged out of ser-

! vice for maintenance. (liydraulic shock and sway arrestor units 1

were being replaced on components of system I.) V-20-4 was l manually opened approximately 15 minutes after this valve prob-4 1em was identified.

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APPARENT CAUSE Design Procedure l Unusual Service Condition i 0F OCCURRENCE: F!anufacture I Installation / Inc. Environmental Construction Component Failure

i Operator Other (Specify)

I j The apparent cause of this occurrence has not been identified i

at this time.

i j swidliSIS OF iiutui-upezated valve V-::0-4 pivvidcs sucticr. to the "::" ccrc OCCURRENCE:

. spray pump in core spray system II. This valve is normally i maintained in the open position but is closed whenever required

! for isolation purposes, llad core spray system operation been required, the "B" core spray pump would have functioned nor-1 mally both before performance of the surveillance testing and l

I after the valve was locked in the open position. Only the l isolation function of the valve was lost.during these two time I

s l periods . The safety significance of this event is that for a i, period of approximately 15 minutes core spray pump redundancy

,l was lost in system II. Since" system I was tagged out of service during this time period, a further degradation in core spray 4

system capability resulted. ,

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Repo'rt No. 50-219/74/29 Page 3

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, CORRECTIVE Immediate corrective action involved manually opening the motor . --

i ACTION: .

, operated valve (V-20-4) and tagging open the associated ' circuit .

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breaker to prevent subsequent closing. Additional corrective ,

r actions will be determined following the completion of mainten-

.i ance and review of this incident by the Plant Operations Review j

} Committee. .

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l FAILURE DATA: To be supplied at a later dato. s 1-3 4  ;

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! OYSTER CREEK NUC1. EAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 t

l Abnormal Occurrence Report No. 50-219/74/28 l

Renort Date April 26, 1974 a

Occurrence Date April 19, 1974 i ,

Identification of Occurrence Violation of the Technical Specifications, paragraph 3.4.A.'1, which requires the core spray system to be operable at all times with irradiated fuel in the reactor vessel, except as specified in Specification 3.4.A.3 and 3.4. A.4.

Suction valve (V-20-4) to the "B" core spray pump was stuck in the closed position for a period of approximately 15 minutes, thereby causing a loss of core spray pump redundancy in system II. In addition, core spray system I i was tagged out of service for maintenance at this time. This event is considered '

to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15E and D.

l Conditions Prior to Occurrence The plant was shut down for refueling.

4 The reactor mode switch was in the REFUEL position with reactor coolant tem-perature approximately 104*F.

s Description of Occurrence At approximately 0715 on April 19, 1974, while performing surveillance testing on core spray system II, motor-operated valve V-20-4 failed to open electrically

< after having closed electrically in the normal manner. This surveillance test-ing ws being performed on core spray system II after system I was tagged out i of service for maintenance. (Hydraulic shock and sway arrestor units were being replaced on components of system I.) V-20-4 was manually opened approximately 15 minutes after this valve problem was identified.

Apparent Cause of Occurrence

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The apparent cause of this occurrence has not been identified at this time.

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i Analysis of Occurrence Motor-operated valve V-20-4 provides suction to the "B" core spray pump in 1

core spray system II. This valve is normally raintained in the open position.

j Had core spray system operation been required, the "B" core spray pump would l

have functioned normally both before performance of the surveillance testing and after the valve was locked in the open position. The safety significance of this event is that for a period of cpproximately 15 minutes, core spray pump redundancy was lost in system II. Since system I was tagged out of i service during this time period, a further degradation in core spray system capability resulted.

Corrective Action Immediate corrective action involved manually opening the motor-operated valve (V-20-4) and tagging open the associated circuit breaker to prevent subsequent closing. Additional corrective actions will be determined following the completion of the investigation into the cause of this event and a review of the surveillance requirements for this valve will be performed.

4 Failure Data I The cause for this failure has not been identified at this time.

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MADISON AVENUE AT PUNCH BOWL ROAD

• MORRISTOWN, N.J. 07060

• 201-539-6111 GlNonRtd THE General ,'o{ Public Utilitics Corporation SF378 er d

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April 26, 1974 s +, 0 g SEClWLO c I,iAY 1 1974 o

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Deputy Director for Reactor Projects Directorate of Licensing i United States Atomic Energy Commission

! Washington, D. C. 20545 Dear bir. Giuduussu.

Subject:

Oyster Creek Station i Docket No. 50-219 Abnormal Occurrence Report No. 50-219/74/28 The purpose of this letter is to forward to you the attached Abnormal Occurrence Report in compliance with paragraph 6.6.2.a of the

Technical Specifications.

i Enclosed are forty copies of this submittal.

Very truly yours,

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QLO< SL J 's & @ <' -

Donald A. Ross blanager, Nuclear Generating Stations cs

Enclosures ,

1 cc: Mr. J. P. O'Reilly, Director j Directorate of Regulatory Operations, Region I .t L

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• ADDENDUb!

Abnornal Occurrence Report No. 50-219/74/28 Abnormal Occurrence Report No. 50-219/74/28, occurrence date April 19, 1974, reported that motor-operated valve V-20-4 failed to open c1cetrically after closing electrically in a normal manner during the performance of surveil-lance testing on core spray system II. Since valve V-20-4 provides suction to the "B" core spray pump, core spray pump redundancy was lost in system II during the period of time that the valve was stuck in the i:losed position. Immediate corrective action involved manually opening the motor-operated valve (V-20-4) and tagging open the associated circuit breaker to prevent subsequent closing.

Since core spray syst'em I was tagged out for maintenance at the time of this abnormal occurrence, it was not immediately possibic to troubleshoot and determine the cause of the V-20-4 failure. Consequently, the initial abnormal occurrence report did not identify the cause of the valve failure.

The purpese of this addendum is to report the apparent cause of the failure, additional items of corrective action and pertiner.t failure data.

Apparent Cause of Occurrence Refer to the attached schematic diagram of the opening and closing control circuitry for V-20-4 (Figure 1) . Torque swite,. TS-0 is provided to inicitupi LLv svn ti vi slicuitry if a ;;.cchnical cverl ad cc:urs during the opening cycle. Position suitch 20-C is provided to override the function of TS.-0 during the initial stages of the opening cycle. This position switch (20-C) is normally adjusted to open at approximately 10'6 of valve travel.

Investigation of the control circuitry after the abnormal occurrence revealed that 20-C was opening prematurely at 6'6 to 7'6 of valve travel. It has, therefore, been concluded that 20-C opened before torque switch TS-0 closed, thereby preventing V-20-4 from opening.

Additional Corrective Action Position switch 20-C was readjusted to open at approximately 10'6 of valve travel. ,

Failure Data blanufacturer data pertinent to the V-20-4 valve control are as follows:

blanufacturer: Limitorque tiodel No.: 391667-ES Flotor llP: .67 l M' C

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. Opening And Closing Control Circui try I or V-20-4

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. l O O l i .. l j , Jersey Central Power & Light Company l MADISON AVENUE AT PUNCH OOWL ROAR

• MORRISTOWN.N.J.07960

• 201-539-6111

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cenerai Pubhc Utihties Co'poration j ,,,,..

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[ July 11,1974 ,3 10-i l!),

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,1 Nl.15 1974 i Mr. A. Giambusso  ;

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Directorate of Licensing ih *2:[$ $7 fe s ;

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l United States Atomic Energy Commission be -%

Washington, D. C. 20545 N dM_. q

Subject:

Oyster Creek Station Docket No. 50-219

• Addendum to Abnormal Occurrence

. No. 50-219/74/28 In my report of Abnormal Occurrence No. 50-219/74/28 dated

April 26, 1974, complete infomation on the Apparent Cause of the

- Occurrence, Corrective Action, and Failure Data was not furnished since

.t the investigation of this occurrence had not been completed on April 26.

This investigation hr.s now been completed. Tne attached report is an

addendum to Abnormal Occurrence No. 50-219/74/28 and serves to complete i the original report, ,

l Enclosed are forty copics of this submittal.

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il Very tre.ly yours, W (a g 1

. Donald A. Ross Manager, Nacicar Generating Statior.s Cs t's Enclosures i

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