PNO-III-88-018, on 880309,reactor Scrammed.Caused by Technician Error.Licensee Elected to Place Unit in Cold Shutdown for Various Maint Activities.State of Il & NRC Notified

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PNO-III-88-018:on 880309,reactor Scrammed.Caused by Technician Error.Licensee Elected to Place Unit in Cold Shutdown for Various Maint Activities.State of Il & NRC Notified
ML20150B980
Person / Time
Site: LaSalle Constellation icon.png
Issue date: 03/10/1988
From: Forney W, Ring M
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-88-018, PNO-III-88-18, NUDOCS 8803170227
Download: ML20150B980 (1)
v • d • e


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PRELIMIHARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I!!-88-18 Date March 10, 1988

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1.

g4 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without

, verification or evaluation, and is basically all that is known by the Region III staff on this date.

Facility: Comonwealth Edison Company Licensee Emergency Classification:

1 LaSalle 2 Notification of an Unusual Event

Marseilles, IL 61341 Alert Site Area Emergency D M .? No. 50-374 General Emergency X Not Applicable

Subject:

REACTOR SCRAM

' At S:39 p.m. (CST) on March 9,1988, Unit 2 scrammed from 85 percent power as a result of a technician's error while performing surveillance testing on Reactor Core Isolation Cooling 4

instrumentation. The technician opened a wrong valve in the instrument system which led to a series of events including the tripping of the reactor recirculation pumps and a pertur-j bation in the feedwater heaters. As a result cooler feedwater was pumped into the reactor, i causing reactor power level to go up. The power surge triggered the scram, i

i i Following the scram all systems functioned as expected. The licensee elected to place the '

unit in cold shutdown for about five days for various maintenance activities.

The State of Illinois will be notified, i

4 i -The reactor scram was reported to the Headquarters Operation Center at 6:32 p.m. on March 9, ,

1988, and the Operations Center subsequently notified Region III (Chicago). This '

information is current as of 9 a.m., March 10, 1988.

5

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, CONTACT: M. Ring W. Forney i FTS 388-5602 FTS 388-5590 i

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DISTRIBUTION: l 1 H. St. NMBB Phillips E/W WFN 1 l Chairman Zech XEDD NRR DTA KM5T-Com. Roberts ARM 01 l

j Comm. Bernthal EDO AirRights Mail To: i Com. Carr PA SLITP p0 7 DCS (Original)

' Comm. Rogers OGC DOT (Trans. Only)

SECY 1 OGC-H FAX T0: Nicholson Lane Regions ICA INPO /.'/O RE5 Region I

' GPA NSAC ///t Region II ACRS Licensee /- 'A' Region IV l

1

. PDR Resident Inspector Region V HQS Operations Officer /.'A3 .

g Region III 9

[7 8803170227 880310 Rev. November 1987 ,

t PDR I&E PNO-III-88-018 DCD 8,D

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