PNO-III-88-029, on 880402,shutdown Begun to Repair Steam Generator Tube Leak.Leakage Rate from RCS Into Secondary Sys Calculated to Be 330 Gallons Per Day.Other Maint & Testing Work Planned in Addition to Investigation & Repair

PNO-III-88-029:on 880402,shutdown Begun to Repair Steam Generator Tube Leak.Leakage Rate from RCS Into Secondary Sys Calculated to Be 330 Gallons Per Day.Other Maint & Testing Work Planned in Addition to Investigation & Repair

ML20151B026
Person / Time
Site:	Byron
Issue date:	04/04/1988
From:	Forney W, Hinds J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-88-029, PNO-III-88-29, NUDOCS 8804080017
Download: ML20151B026 (1)

PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-88-29 Dato 04/04/88 l

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This preliMnary notification constitutes EARLY notice of events of POSSIPLE safety or public interest significance. The information is as initially received without veriffcatica or evaluation, and is basically all that is known by the Region III staff en ti its date.

Facility: Licensee Emergency Classification:

Notification of an Unusual Event Comonwealth Edison Company Alert Lyron Unit 1 Site Area Emergency Bryon, IL 61010-9750 General Emergen X Not Applicable

Subject:

SHUTDGWN TO REPAIR STEAM GENERATOR TUBE LEAK At 9:50 p.m. on April 2, 1988, the licensee began shutting down Unit 1 because of a tube leak in the ID steam generator, and the shutdown was completed at 9:03 a.m. on April 3, 1988. The calculated leakage rate from the reactor cooling system into the secondary system was 330 gallons per day. The license limit for such leaxage is 500 gallons per day. The leakage rate 10 days previously had been 1 gallon per d6y.

The licensee estimates the outage will last for 14 days. Other maintenance and testing work is planned in addition to the investigation and repair of the steam generator tube leakage. The resident inspectors will monitor the outage activities.

The State of Illinois will be notified.

Region III (Chicago) and the resident inspectors had been closely monitoring the increasing steam generator tube leakage prior to the licensee's decision to shut down.

This information is current as of 9:00 a.m., April 4, 1988.

CONTACT: H s 388-5575 388-5590 DISTRIBUTION:

H. St. NMBB Phillips E/W WFN 1 Chairman Zech XE'0D NRR 617 NMSS Com. Roberts ARM 01 SLITP Com. Bernthal ED0 Mail To:

Com. Carr PA Resident Inspector Offices FCS(Original)

Com. Rogers OGC Resident Inspector DOT (Trans. Only)

SECY OGC-H Nicholson Lane Regions

, CA FAXT0:/2 INPO RES Region I GPA NSAC /2 # Reaion II ACRS Licensee /8. Region IV PDR HQS. Operations Officer /2 Regicn V Region III 4 t?R83IL: 11 Rev. November 1987 4

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