PNO-III-86-046, on 860516,RCS Found Leaking Approximately 20 Gpm.Caused by Failed Packing in Pressurizer Spray Valve. Valve Packing & leak-related Damage to Drain Line Sight Glass & Rupture Disk Will Be Repaired

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PNO-III-86-046:on 860516,RCS Found Leaking Approximately 20 Gpm.Caused by Failed Packing in Pressurizer Spray Valve. Valve Packing & leak-related Damage to Drain Line Sight Glass & Rupture Disk Will Be Repaired
ML20198D081
Person / Time
Site: Zion File:ZionSolutions icon.png
Issue date: 05/16/1986
From: Burgess B, Guldemond W
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-86-046, PNO-III-86-46, NUDOCS 8605230132
Download: ML20198D081 (1)


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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-46 Date May 16,1986 Dm (

This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without v:rification or evaluation, and is basically all that is known by the Region III staff on this date. ,

Facility: Commonwealth Edison Co.

Zion Unit 1 Licensee Emergency Classification:

Zion IL 60099 XX Notification of an Unusual Event Alert Docket No: 50-295 Site Area Emergency General Emergency Not Applicable

Subject:

DELAY OF STARTUP TO REPAIR REACTOR COOLING WATER LEAKAGE On May 16, 1986, licensee personnel entered the Unit I reactcr containment to investigate the source of reactor coolant system leakage of approximately 20 gallons per minute. The unit was in a hot shutdown mode preparing to start up.

During the containrent entry, the licensee determined that the packing had failed in one of two pressurizer spray valves. The leakage from the failed packing was carried by the valve packing drain line to the pressurizer relief tank. The leakage caused a sight glass in the drain line to rupture and the rupture disk to fail in the pressurizer relief tank.

The unit is being placed in cold shutdown to repair the valve packing, the sight glass, and the pressurizer relief tank rupture disk.

The licensee declared an unusual Event under its emergency plan at 5:30 a.m., May 16,1986.

The resident inspector is on site monitoring the licensee's activities.

The State of Illinois will be notified.

R:gion III (Chicago) was notified of this event at 6:15 a.m., May 16, 1986, by the Headquarters Duty Officer. This information is current as of 10 a.m., May 16, 1986.

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CONTACT: E. . ldemond FTS 388-5689 FTS 388-5574 DISTRIBUTION:

H. St. EDO NRR E/W Willste Mail: ADM:DMB Chairman Palladino PA IE NMSS D0T:Trans only ,

Comm. Zech ELD OIA RES l

Com. Bernthal AE0D Com. Roberts Comm. Asselstine SP \\:C} Regional Offices ACRS SECY INP0 A: 0) NSAC I):%Cl CA RIII Fesid6nt Office PDR Licensee: lx O S (Corp. Office - Reactor Lic. Only) l 8605230132 860516 pegion III M-IhS6-046PDR Rev. November %5