PNO-III-85-062, on 850719,confirmatory Action Ltr Issued Requiring Review of All Canceled or Rejected Change Requests to Verify Status of Drawing Changes Prior to Restarting Both Reactors

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PNO-III-85-062:on 850719,confirmatory Action Ltr Issued Requiring Review of All Canceled or Rejected Change Requests to Verify Status of Drawing Changes Prior to Restarting Both Reactors
ML20128N562
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 07/19/1985
From: Chrissotimos N, Greenman E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-85-062, PNO-III-85-62, NUDOCS 8507260228
Download: ML20128N562 (1)
v • d • e


" PPELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-85-62 Date July 19, 1985 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or O public interest significance. The information is as initially received without veri-fication or evaluation, and is basically all that is known by the staff on this date.

Facility: Commonwealth Edison Company Licensee Emergency Classification:

LaSalle Nuclear Plant Notification of an Unusual Event Marseilles, IL 61341 Alert Site Area Emergency Docket No. 50-373, 50-374 General Emergency XX Not Applicable

Subject:

CAL ISSUED BECAUSE OF FAULTY INSTALLATION On July 19, 1985, Region III issued a Confirmatory Action Letter requiring the licensee to

< review all cancelled or rejected drawing change requests (DCRs) on Units 1 and 2 to verify th3 status of the DCRs prior to restarting both reactors. (The units are currently in cold shutdown.)

The CAL was issued as a result of a July 17, 1985, report in which the licensee said four Residual Heat Removal (RHR) shutdown cooling suction high flow isolation switches in Unit I had been installed properly. The licensee discovered the problem while performing a special test to confirm the operability of ECCS instrumentation.

The licensee determined that the installation error was caused when a change in piping to the switches in 1982 was not reflected in the field drawing. As a result, a later modification to the switches was based on incomplete information. Piping to the switches was installed backwards, and the switches would not have worked if called upon.

The safety significance of this event is minimal since the system is isolated during reactor operation, startup or hot standby.

Unit I has been operating since March 1985 with the erroneous installation.

The State of Illinois will be notified.

R:gion III was first informed of this event at 5:35 p.m. (CDT), July 17, 1985.

This information is current as of 4 p.m. (CDT July 19, 1985.

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CONTACT: N. Chrissotimos E. Greenman FTS 388-5518

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