05000029/LER-1986-013, Forwards LER 86-013-00 Re Reactor Scram Due to Operator Error

Forwards LER 86-013-00 Re Reactor Scram Due to Operator Error

ML20214J014
Person / Time
Site:	Yankee Rowe
Issue date:	11/03/1986
From:	St Laurent N YANKEE ATOMIC ELECTRIC CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8612010119
Download: ML20214J014 (1)

LER-2086-013, Forwards LER 86-013-00 Re Reactor Scram Due to Operator Error

Event date:
Report date:
0292086013R00 - NRC Website

text

. . . .

YANKEE ATOMIC ELECTRIC COMPANY r.i.vuvn. tars ><2<.828,

- Star Route, Rowe, Massachusetts 01367 N_

,Yaux, es November 3, 1986 U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Dr. Thomas E. Murley, Rngional Administrator

Subject:

Licensee Event Report 50-29/86-13 Reactor Scram Due to Operator Error

Dear Sir:

In accordance with 10 CFR 50.73(a)(2)(iv), the attached Licensee Event Report is hereby submitted.

Very truly yours, .

& Hun [ t i' f gu, f Normand N. St. Laurent Plant Superintendent DAR/nm Enclosure cc: 3' NSARC Chairman (YAEC) 1 Institute of Nuclear Power Operations (INPO) 8612010119 861103 PDR ADOCK 05000029 S PDR c ...

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On October 4, 1986, at 2309 hours0.0267 days <br />0.641 hours <br />0.00382 weeks <br />8.785745e-4 months <br />, the reactor was scrammed when the Main Steam Line Non-Return Valve (NRV) trip circuit Trip / Reset switch was inadvertently placed in the Trip position. At the time of the scram, the plant was in Mode 2, at a power level of 1 E-7 amps and was preparing to go to Mode 1. All systems performed as designed.

The root cause of the event has been attributed to personnel error by the Control Room Operator (CRO) who was in the process of opening the NRVs. The CR0 intended to place the NRV trip circuit Trip / Reset switch to the Reset position prior to opening the NRV. The switch was inadvertently turned to the Trip position thus causing the reactor to scram on a NRV closure signal.

Corrective actions include: 1) reinstructing the CR0s of the importance of switch positioning and 2) placing a step in applicable plant proceduce to make operators aware of the consequence of incorrect NRV trip circuit trip / reset switch positioning.

There was no adverse effect to the public health and safety as a result of this event. This is the first event of this nature.

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