PNO-III-86-049, on 860522,Region III Dispatched Augmented Insp Team to Review Circumstances Surrounding 860519 Reactor Trip,Including Equipment Problems Involving Failure of Turbine Bypass & Atmospheric Dump Valves

PNO-III-86-049:on 860522,Region III Dispatched Augmented Insp Team to Review Circumstances Surrounding 860519 Reactor Trip,Including Equipment Problems Involving Failure of Turbine Bypass & Atmospheric Dump Valves

ML20205Q084
Person / Time
Site:	Palisades
Issue date:	05/22/1986
From:	Burgess B, Hehl W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-86-049, PNO-III-86-49, NUDOCS 8605280155
Download: ML20205Q084 (2)

0 7n 8-PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-49 Date May 22, 1986 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety ,

t' 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.

Facility: Consumers Power Company Licensee Emergency Classification:

Palisades Nuclear Generating Plant XX Notification of an Unusual Event Covert, MI 49043 Alert Site Area Emergency Docket No: 50-255 General Emergency Not Applicable

Subject:

AUGMENTED INSPECTION TEAM TO REVIEW RECENT EQUIPMENT PROBLEMS R:gion III (Chicago) has dispatched an Augmented Inspection Team to review the circumstances surrounding a reactor trip which occurred on May 19, 1986. Although plant safety systems generally performed as designed during the reactor trip, several equipment problems occurred. These equipment problems, coupled with various problems that have occurred over the past 18 months, led to the formation of the Augmented Inspection Team.

The Augmented Inspection Team is composed of Region III personnel and representatives from the Office of Inspection and Enforcement, Office of Nuclear Reactor Regulation, and Office of Analysis and Evaluation of Operational Data. The team will focus on the plant's maint: nance activities and procedures for determining equipment operability.

A Confirmatory Action Letter was issued by Region III to the licensee on May 21, 1986, documenting the licensee's agreement to rtace the unit in cold shutdown, pending a review by th licensee of the May 19 event and an #',aluation of the operability of other safety-related and balance-of-plant equipnent. The licensee is also to notify Region III of c:rr:ctive actions taken as a result of these reviews and receive concurrence of the Regional Administrator for resuming operations.

In th? May 19 incident, the reactor tripped from high pressure after a loss of turbine control power. Equipment problems included the failure of the turbine bypass valve to open automatically, the failure of one atmospheric dump valve to open, failure of a letdown DISTRIBUTION:

H. St. E00 NRR E/W Willste Mail: ADM:0MB Chainnan Palladino PA IE NMSS D0T:Trans only Com. Zech ELD OIA RES Comm. Bernthal AEOD Com. Roberts Conrn. Asselstine SP ///9 Regional Offices ACRS SECY INP0//.2/ NSAC //. 9 CA RIII Yesident Office g PDR Licensee: //. SL (Corp. Office - Reactor Lic. Only) D fgj g 55 060522 Region III C PNO-III-06-049 PDR Rev. November 1985 g3

PRELIMI_ NARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-49 Date May 22, 1986

intermediate pressure control valve, and failure of a pressurizer spray valve to reseat.

Upon evaluation of the shutdown, the licensee declared an Unusual Event under its emergency

. pl an.'

The licensee is planning to issue a news announcement on the shutdown and the pending NRC Augmented Inspection Tean review. A special review team has also been formed by the licensee.

Th2 State of Michigan will be notified.

This information 1. current as of 9 a.m., May 22,1986.

'8 CONTACT:

<pm f,. Burgess fh W. Hehl FTS 388-5689 FTS 388-5552

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