PNO-II-86-001, on 860101,reactor Tripped from High Flux to Flow Resulting in Actuation of Emergency Feedwater Initiation.Caused by Sheared Shaft on One of Four Reactor Coolant Pumps.Feedwater Flow Secured

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PNO-II-86-001:on 860101,reactor Tripped from High Flux to Flow Resulting in Actuation of Emergency Feedwater Initiation.Caused by Sheared Shaft on One of Four Reactor Coolant Pumps.Feedwater Flow Secured
ML20141G417
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 01/02/1986
From: Carroll R, Panciera V
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-86-001, PNO-II-86-1, NUDOCS 8601100203
Download: ML20141G417 (2)


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January 2,1986 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-86-1 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this dat2.

FACILITY: Florida Power Corporation Licensee Emergency Classification:

Crystal River Unit 3 Notification of Unusual Event Docket No. 50-302 Alert Crystal River, Florida Site Area Emergency General Emergency X Not Applicable

SUBJECT:

UNSCHEDULED SHUTDOWN GREATER THAN 48 HOURS The Crystal River Unit 3 reactor tripped from high flux to flow while the plant was operating at 93 percent power at 11:34 p.m. (EST) yesterday, as the result of what could be a sheared shaft on one of the plant's four reactor coolant pumps. Operators observed a reduction in the pump's operating motor current and detected signs that first and second shaft seals were damaged.

The resulting turbine generator trip caused a pressure increase in the unit's secondary system, actuating the emergency feedwater initiation and control system and causing the lifting of steam generator safety valves, one of which stuck open until it was manually unstuck. Emergency feedwater flow to the steam generators was secured within 10 minutes.

The primary system experienced minimal cooldown.

Tha plant, now in hot standby, will be cooled down further so that repairs can be made.

Region II is planning to send a team of inspectors to the site to follow Florida Power's repairs and analysis of this incident.

Flcrida Power and Region II have responded to media inquiries. .

Th2 State of Florida has been informed.

Flcrida Power informed the NRC headquarters incident response center of this occurrence by telephone at 11:54 p.m. yesterday. This information is current as of 2 p.m. today.

Contact:

R. Carroll, 242-5543 V. W. Panciera, 242-5525 DISTRIBUTION:

H. Street MNBB Phillips E/W Willste MAIL:

Chairman Palladino TUU~ NRR TE~ NM55 ADRIUMB Conin, Roberts PA OIA RES D0T: Trans Only Comm. Asselstine MPA AE00 Applicable State Comm. Bernthal ELD Comm. Zech Air Rights INP0 SECY SP NSAC ACRS CA PDR Regions:

Licensee:

(( - H 8601100203 e60102 I PDR I8sE PNO-II-86-001 PDR O

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Applicable Resident Site

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