05000029/LER-1986-003, Forwards LER 86-003-00

Forwards LER 86-003-00

ML20195E190
Person / Time
Site:	Yankee Rowe
Issue date:	05/16/1986
From:	St Laurent N YANKEE ATOMIC ELECTRIC CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8606050201
Download: ML20195E190 (1)

LER-2086-003, Forwards LER 86-003-00

Event date:
Report date:
0292086003R00 - NRC Website

text

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.y YANKEE ATOMIC ELECTRIC COMPANY r.,.vu cc. tars,<2s.82e, Star Routo, Rowe, Massachusetts 01367

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. ~YANKEE May 16, 1986 s

U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Dr. Thomas E. Murley, Regional Administrator

Subject:

Licensee Event Report 50-29/86-003 Failure to Comply with a Technical Specification Action Statement

Dear Sir:

In accordance with 10 CFR 50.73(a)(2)(1), the attached Licensee Event Report is hereby submitted.

Very truly yours, ht $llbk Normand N. St. Laurent Plant Superintendent N

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Enclosure cc: ;3:1 NSARC Chairman (YAEC) 1:i Institute of Nuclear Power Operations (INPO) i hk 6 \

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• DOCmET NuMSER 12) 7 ACILITY 8sAME 496 YANKEE NUCLEAR POWER STATION, ROWE, MASSACI!USETTS ol5l0lol0101219 1 lOFl 011 TITLE les FAILURE TO COMPLY WITil A TECllNICAL SPECIFICATION ACTION STATEMENT EVENT DATE Ill LER meuwele le. REPORT CATE ey) QTHER F ACILITIES INv0LVEo tel DOCKE T NuwstR5$1

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On April 16, 1986, at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, with the plant in Mode 1 at 100 percent power, the nuclear instrumentation intermediate power range channel nunber 3 and its associated input to the reactor scram logic were made inoperable.

during maintenance on intermediate range channel number 3. This resulted when the signal cable from the detector, which is shared by the intermediate range and intermediate power range channels, was disconnected to check the intermediate range channel response and accuracy to a test signal. Contrary to Technical Specification 3.3.1, Table 3.3-1, Action Statement 2.0, which applies during this condition, the associated scram logic was not set for single channel operation. The testing was conducted in accordance with an approved procedure, OP-4601, " Nuclear Channel Functional Test." After the completion of channel 3 maintenance, the procedure was repeated in the same manner on intermediate range channel number 4. Each channel was inoperable for approximately one hour. Scram inputs from five nuclear instrumentation channels were available during the time these channels were inoperable.

The root cause of this occurrence was attributed to personnel error. The appropriate plant personnel have been made aware of the proper interpretation of this Technical Specification. A precaution in plant procedure OP-4601 has i

been corrected to reflect the Technical Specification requirement.

There was no adverse effect to the public health or safety as a result of this occurrence.

YgN .

NRC poem 3ee i