PNO-III-86-069, on 860715,full Scram & ECCS Actuation Occurred During Heatup of Reactor Pressure Vessel.Approx 10 Gallons of Water Injected Into Vessel.Caused by Pressure Spike from Flow Perturbation.State of Mi Informed

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PNO-III-86-069:on 860715,full Scram & ECCS Actuation Occurred During Heatup of Reactor Pressure Vessel.Approx 10 Gallons of Water Injected Into Vessel.Caused by Pressure Spike from Flow Perturbation.State of Mi Informed
ML20207G950
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 07/16/1986
From: Guldemond W, Wright G
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-86-069, PNO-III-86-69, NUDOCS 8607230260
Download: ML20207G950 (1)


i PRELIM 1 NARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PN0-III-86-69 Date July 16 01986 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety ,

or public interest significance. The information is as initially received without {

verification or evaluation, and is basically all that is known by the Region III '

staff on this date, c%

Facility: Detroit Edison Company Licensee Emergency Classification: l Fermi 2 XX Notification of an Unusual Event l Newport, MI 48166 Alert Site Area Emergency Docket no: 50-341 General Emergency Not Applicable

Subject:

ECCS ACTUATION On July 15, 1986, the licensee commenced heatup of the reactor pressure vessel for hydrostatic testing of the pressure vessel. The pumps being used for the heat source were recirculation pump A and the two Division II Residual Heat Removal (RHR) pumps. At 11:07 p.m. the heatup was terminated at 170 and about 30 psig by turning off the two Division II RHR pumps. Upon turning off the last RHR pump a full scram and ECCS actuation was received on sensed low reactor level. These actuations caused an injection into the reactor vessel of approximately 10 gallons of water from the core spray pumps and pressurization of the vessel to 380 psig, which is the shutoff pressure of the core spray pumps.

An Unusual Event was declared at 11:20 p.m. Upon reviewing level indication in the control roomo the licensee determined that level did not change from its normal indication and therefore the actuated safety equipment was secured. The unusual event was terminated at 11:32.

The licensee has preliminarily determined that the low level signal was due to a pressure spike from the flow perturbation caused by securing the RHR flow.

The State of Michigan will be informed.

The resident inspectors are monitoring the licensee's evaluation of the incident. Region Ill (Chicago) was notified of the incident at about 11:45 p.m. (EDT) by the Headquarters Duty Officer. Th' nformation is c.urrent a3 of 11 a.m., (CDT) June 16, 1986.

f.Gudemond86' CONTACT: . gt Mkhu'/t FTS 388-5695 FTS 388-5574 DISTRIBUTION:

H. St. ED0 NRR E/W Willste Mail: ADM:DMB Chairman Palladino PA IE NMSS D0T:Trans only Comm. Zech ELD OIA RES Comm. Bernthal AE0D Comm. Roberts Comm. Asselstine ACRS SP fx:M Regional Offices [

SECY INPO d; O NSAC,.Q: M Oh CA RIII Resident Office PDR Licensee: &OD (Corp. Office - Reactor Lic. Only) g72g60860716 PNO-III-86-069 PDR 9 "

Rev. November 1985