PNO-II-86-091, on 861209,reactor Trip Occurred & Feedwater Line Ruptured Upstream of Main Feedwater Pump 2-A,injuring 8 Personnel,Some Seriously.Caused by Break in Elbow on Mainfeed Pump Header.Unit Maintained Stable Condition

PNO-II-86-091:on 861209,reactor Trip Occurred & Feedwater Line Ruptured Upstream of Main Feedwater Pump 2-A,injuring 8 Personnel,Some Seriously.Caused by Break in Elbow on Mainfeed Pump Header.Unit Maintained Stable Condition

ML20211L594
Person / Time
Site:	Surry
Issue date:	12/10/1986
From:	Cantrell F, Croteau R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-86-091, PNO-II-86-91, NUDOCS 8612160100
Download: ML20211L594 (3)

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a . December 10, 1986 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-86-91 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 date.

FACILITY: Virginia Electric & Power Company Licensee Emergency Classification:

Surry Unit 2 Notification of Unusual Event Docket No. 50-281 X Alert Surry, Virginia Site Area Emergency General Emergency Not Applicable

SUBJECT:

PERSONNEL INJURIES FOLLOWING SECONDARY SYSTEM PIPE BREAK On December 9, 1986, at 2:20 p.m. (EST), with both units operating at 100 percent power, Unit 2 experienced a reactor trip after receiving a low-low water level signal from its "C" steam generator. Shortly thereafter, an 18-inch feedwater line ruptured upstream of the "2-A" main feedwater pump, injuring eight contractor personnel, some seriously, who were working in the area.

Operators immediately isolated the affected area in the secondary system. Of the eight p;rsons injured, the more seriously injured personnel were transported to area hospitals.

Five remain in serious condition, suffering from burns, in local general hospitals. One fatality has occurred and two others have been treated and released.

The licensee maintained the Unit i; a stable condition, following the reactor trip and shutdown of the secondary system's main feedwater pumps, by feeding water to the steam generators through the auxiliary feedwater system and by venting steam from the steam generators through the power operated relief valves.

The licensee declared an Unusual Event at 2:30 p.m. (EST) and escalated it to an Alert at 2:40 p.m. (EST). Both were terminated at 4:23 p.m. (EST) after all plant personnel had ueen accounted for.

Upon notification of the event, Region 11 manned its Incident Response Center and went on Standby. The Regional center remained in constant contact with Headquarters and the Surry control room throughout the event. The Regional center was downgraded from standby at 5:05 p.m. (EST) but remained staffed until 2:30 a.m. (EST) December 10, 1986. The Surry senior resident inspector was at the site and the North Anna senior resident inspector arrived at the Surry site at approximately 7:00 p.m. (EST). A four-person Regional inspection team arrived at the site at 10:20 p.m. (EST), led by the Deputy Director of the Division of Reactor Safety, and accompanied by a Regional public affairs officers.

Preliminary information from the inspection team indicates that the probable cause of the low-low steam generator water level was shrink associated with the failing shut of the "C" main steam isolation valve.

The ruptured suction line experienced a circumferential break in the elbow on the "A" mainfeed pump header. The pipe was displaced several feet by the force of the rupture.

Today (December 10) the NRC site team has been officially implemented as an Augmented Inspection Team (AIT) after being joined by a Regional metallurgy expert and a water hammer expert from the Headquarters Office of Nuclear Reactor Regulation.

8612160100 861210 M-I 6-091 PDR d

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Unit i remain:d.at-100 percent power throughout the period, but the licensee has announced that Unit 1 will be shut down at 7 p.m. (EST) tonight for inspection and evaluation.

Considerable media interest has occurred. The licensee and the NRC responded to numerous media inquiries throughout the night. The licensee activated its emergency news center in Richmond for a time last night and held two news briefings today. A Region II public affairs officer participated in those briefings.

The Commonwealth of Virginia was notified, and Region II has kept state officials fully informed throughout the night and today.

H:alth physics surveys of the damaged area, and of injured personnel, indicated that the individuals were not contaminated prior to transport offsite and that no radioactivity was involved with the event.

As of 7:03 a.m. (EST) today, the Unit was in cold shutdown at less than 200 degrees (F).

The NRC (Region II) received initial notification of this event by telephone from the resident inspector at 2:25 p.m. (EST) on December 9.

This information is current as of 4:00 p.m. (EST) on December 10.

Contact:

R. Croteau, 242-4668 F. Cantrell, 242-5534

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Licensee: ' 6 .' W (Reactor Licensees)

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PN No. PN0 .E- St.-9i DAre hECEMBER 10j }9%

PPFr.TMINARY NUI'IFICATION (PN) DISTRIBlTTICN INTERNAL REGICN II DISTRIBlTTION Regional Administrator Deputy Administrator Director, 'IVA Director, DRP (3)

Director, DRS (2)

Director, DRSS (2)

Director, State & Government Affairs General Files e

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