NRC-90-0007, LER 89-036-00:on 891218,control Room Operator Inadvertently Depressed Closed Push Buttons on Inboard MSIVs A,B & C & Reactor Scram Resulted.Caused by Operator Error.Operator Involved Was Removed from Licensed duties.W/900117 Ltr

LER 89-036-00:on 891218,control Room Operator Inadvertently Depressed Closed Push Buttons on Inboard MSIVs A,B & C & Reactor Scram Resulted.Caused by Operator Error.Operator Involved Was Removed from Licensed duties.W/900117 Ltr

ML20006A808
Person / Time
Site:	Fermi
Issue date:	01/17/1990
From:	Orser W, Pendergast J DETROIT EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-90-0007, CON-NRC-90-7 LER-89-036, LER-89-36, NUDOCS 9001300245
Download: ML20006A808 (5)

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January 17, 1990 NRC-90-0007 i

l U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Reference Fermi 2 NRC Docket No. 50-3381 Facility Operating License No. NPF-43

Subject:

Licensee Event Report (LER) No.89-036 Please find enclosed LER No.89-036, dated January 17, 1990, for a reportable event that occurred on December 18, 1989. A copy of this LER is also being sent to the Regional Administrator, USNRC Region !!I.

i I If you have any questions, please contact Joseph

( Pendergast at (313) 586-1682.

Sincerely, W

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Enclosure:

NRC Forms 366, 366A 1

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On December 18, 1989, Instrument & Controls (I&C) personnel signed on surycillance 44.020.151 "NSSSS - Reactor Water Cleanup 8

Differential Flow Functional Test". An I&C technician stationed in the Control Room requested the Control Room Operator to reset Nuclear Steam Supply Shutoff System (NSSSS) Division I and II Hain Steam Isolation Valve (MSIV) logic, as directed by the procedure.

At 2230 hours0.0258 days <br />0.619 hours <br />0.00369 weeks <br />8.48515e-4 months <br />, the Control Room Operator inadvertently depressed  ;

the closed push buttons on the A, B and C inboard MSIV's and a reactor scram resulted. The immediate actions of the Reactor Scram Abnormal Operating Procedure (20.000.21) were performed and the plant was in a stable condition at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />.

The cause of this event was Operator error. Nuclear Training is reviewing resetting the Nuclear Steam Supply System isolation logic with control room personnel. The Operator involved was removed from licensed duties and participated in an accelerated requalification training program. A critique of this event will be issued as required reading.

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Fermi 2 o [s j o j o lo l 3 l4 l1 8 l9 0 l3l6 0l 0 0 l2 or 0l4 Y(KT & sure apece e sepwost, use esterneme r gag pow agga w ggy Initial Plant Conditions:

Operational Condition: 1 (Power Operation)

Reactor Power: 20.5 Percent Reactor Temperature 540 degrees Fahrenheit Reactor Pressure 930 psig Description of the Eve'nt:

On December 18, 1989, Instrument & Controls (I&C) personnel signed on surveillance 44.020.151, "NSSSS - Reactor Water Cleanup Differential Flow Functional Test". An I&C technician stationed in the Control Room requested the Control Room Operator to reset Nuclear Steam Supply Shutoff System (NSSSS) (JE) Division I and II Main Steam Isolation Valve (MSIV) (ASV) logic, as directed by the procedure.

'the Control Room Operator thought that the MSIV push buttons needed to be depressed for their current position prior to pushing the MSIV logic reset push buttons. At 2230 hours0.0258 days <br />0.619 hours <br />0.00369 weeks <br />8.48515e-4 months <br />, the Operator inadvertently depressed the "close" push buttons on the A, B and C inboard MSIV's (all inboard MSIV's indicated open). The Control Room Operator realized his error while depressing the "C" inboard MSIV "close" push button and noticed the "A" inboard MSIV going closed. The Operator immediately depressed the "open" push buttons on the A, B and C inboard MSIV's but a reactor scram had already occurred due to MSIV position (< 92% open). Group Isolation Valves (ISV) for the Residual Heat Removal Shutdown Cooling (BO) and Head Spray (BG), Drywell Sumps (WK), and Traversing In-Core Probe (10) systems received an isolation signal as expected when Reactor Vessel 1cvel 3 (Low Level) was reached due to level shrink. The valves that were open isolated.

The immediate actions of the Reactor Scram Abnormal Operating Procedure (20.000.21) were performed and the plant was in a normal shutdown condition at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />.

Cause of the Event:

The cause of this event was Operator (Utility Licensed) error.

The Control Room Operator did not use the proper method for resetting the NSSSS isolation logic. In addition. the Operator did not follow Operations Practice Standard 105, *quipment Operation". This Standard requires that the Operad,r verify system response after action taken. This was not done and three MSIVs were inadvertently closed.

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The closure of the MSIVs resulted in a reactor scram. During the  !

reactor scram all safety systems functioned as designed. . Group l Isolation Valves for Residual Heat Renoval Shutdown Cooling and Head Spray, Drywell Sumps, and Traversing In-Core Probe systems j isolated as expected on the Reactor Vessel level 3 isolation j i signal per design. The immediate actions of the Reactor Scram

. Abnormal Operating Procedure (20.000.21) were performed and the t

! plant was in a normal shutdown condition at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />. '

l Therefore, the health and safety of plant personnel and the general public was protected at all times during this event.

In addition, it should be noted that the affected MSIVs reopened  ;

before going fully closed in response to the Operator's action of I pushing the "open" push button. Operation of the MSIVs in this ,

manner was discussed with the valve vendor, Atwood & Morrill '

Company. No degradation of the MSIVs should be incurred from this I

operation. >

Corrective Actions:

l The Operator involved was removed from licensed duties and .

participated in an accelerated requalification training program.  !

A critique of this event will be issued as required reading. This required reading will be 12. sued by January 31, 1990. Nuclear Training it reviewing resetting the Nuclear Steam Supply System isolation logic with control room personnel. This will be completed by January 31, 1990. The surveillance procedure 411.020.151 will be revised to identify the method for resetting the NSSSS Division I and II MSIV logic. This will be completed by January 31, 1990.

Detroit Edison has developed an action plan which was described in Detroit Edison letter NRC-89-0300, dated December 26, 1989. This plan will address personnel performance weaknesses identified during the first refueling outage and during the return to power operation. f

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3 l0 0 14 or o l4 r,xia . w . - wewmuuoa Previous Siellar Events:

This is the first reportable occurrence related to the inadvertent

! closure of the MSIVs due to personnel error. There were two reportable events where the MSIVs were inadvertently closed due to inadequate procedures. These events were reported in Licensee i Event Reports88-002, " Main Steam Line Radiation Monitor i Surveillance Procedure Inadequacy causes Main Steam Isolation Valve Closure", and 87-037, " Inadvertent Actuation of the Inboard j Main Steam Isolation Valves Due to Procedural Inadequacy".

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