PY-CEI-NRR-0975, Special Rept:On 890112,vibration & Loose Part Monitoring Sys Experienced Series of Spurious Alarms.Caused by Excessive Background Noises.Channel 4 Declared Inoperable on 890122. Channel Will Be Reworked During First Refueling Outage

Special Rept:On 890112,vibration & Loose Part Monitoring Sys Experienced Series of Spurious Alarms.Caused by Excessive Background Noises.Channel 4 Declared Inoperable on 890122. Channel Will Be Reworked During First Refueling Outage

ML20245J286
Person / Time
Site:	Perry
Issue date:	02/21/1989
From:	Kaplan A CLEVELAND ELECTRIC ILLUMINATING CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
PY-CEI-NRR-0975, PY-CEI-NRR-975, NUDOCS 8903070020
Download: ML20245J286 (2)

Text

_ . . __ .

~ THE-CLEVELAND ELECTRIC ILLUMINATING COMPANY-P.O. BOX 97 5 PERRY. OHIO 44081 5 TELEPHONE (216) 259-3737 5 ADDRESS 10 CEhrTER ROAD FROM CLEVELAND: 241 1650 Serving The Best Location in the Nation .j Al Kaplan PERRY NUCLEAR POWER PLANT I i

t1CE PRESIDENT i NUCLEAR GROUP i

February 21, 1989 PY-CEI/NRR-0975 L U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Perry Nuclear Power. Plant Docket'No. 50-440 Inoperable Loose-Part Detection System Instrumentation - Special Report

Dear Sir:

Attached is a Special Report concerning inoperable Loose-Part Detection System

{ Instrumentation. This report satisfies the conditions of Perry Technical Specifications 3.3.7.8 and 6.9.2.

If there are any questions, please feel free to call .

Very truly yours, h it - IN Al Kaplan Vice President Nuclear Group AK/sc Attachment cc: T. Colburn Resident Inspector USNRC Region III Director, Office of Resource Management I

k 8903070020 890222 7 gDR ADOCK 0500044'o PNUg

/['I

_4 Attachment 1 PY-CEI/NRR-0975 L Page 1 of 1 SPECIAL REPORT - IN0PERABLE LOOSE-PART DETECTION SYSTEM 1 INSTRUMENTATION On January 12, 1989 the Vibration and Loose-Part Monitoring (V& LPM) System experienced a series of spurious alarms attributed to excessive background noise. Channel 8 was declared inoperable and the Plant entered Technical Specification action statement 3.3.7.8 requiring a special report if one or more V&LPH channels are inoperable for more than thirty days. The thirty day time limit to restore channel 8 to an operable status was exceeded on February 11, 1989. All aspects of the Technical Specification action statement were met.

This system is designed to continuously monitor the Nuclear Boiler for any indication of loose parts in the Nuclear Boiler System. Ten individual channels monitor the reactor vessel components with sensors physically mounted near natural collection areas. Each channel consists of a detector, pre-amplifier and signal processing electronics which input to a tape recorder, audible speaker, a dB meter, control room annunciator, a spectrum analyzer, an x-y plotter, a loose-part locator, and a printer. Channel 8 monitors the 'B' recirculation discharge line and channel 4 monitors injection  ;

nozzle 'E' from the 'B' feedvater line.

The cause of the spurious alarms was evaluated by the Shift Technical Advisor and the System Engineer to be excessive background noise and not a loose part.

Substitution of the channel 8 preamplifier vitt another preamplifier did not result in lover noise. Therefore, it was concl.uded that the problem is with equipment inside the Dryvell. The channel could not be returned to an operable status because access to the Dryvell requires the plant to be shutdown. Currently channel 8 is inoperable and disconnected via lifted lead, per PAP-1402, " Control of Lifted Leads, Jumpers, Temporary Electrical Devices and Mechanical Foreign Items". The channel vill remain inoperable per Technical Specifications until the plant is placed in cold shutdown for a refuel outage in late February, 1989. The channel vill be reworked and returned to service during our first refueling outage.

Additionally, channel 4 was declared inoperable on January 22, 1989 due to a significant decrease in dB meter reading for its loose parts output.

Presently, channel 4 vill exceed its thirty day action statement of inoperability on February 21, 1989. Troubleshooting revealed a bad loose-parts amplifier section. A new amplifier card was installed and aligned. However, channel 4 vill remain inoperable per Technical Specifications until the channel calibration surveillance, SVI-R63-T1472D can be performed which requires Dryvell entry for pinging and the plant in cold shutdown. This work is also being added to the first refuel outage scope.

SC/ CODED / ATTACH-NRR-0975L

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ ___ - )