ML20081B770

Special Rept:On 950303,vibration & Loose Parts Monitoring (V&Lpm) Sys Channels 1 & 4 Inoperable for More than 30 Days. V&Lpm Channels 1 & 4 Declared Inoperable on 950201 Subsequent to Troubleshooting Activities

ML20081B770
Person / Time
Site:	Perry
Issue date:	03/13/1995
From:	Shelton D CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
PY-CEI-NRR-1923, NUDOCS 9503160343
Download: ML20081B770 (3)

Text

<

g.

co -ar.

PERRY NUCLEAR N)WER PLANT Mail Address: Donalci C molton G CENTER ROAD SENIOR VICE PRESIDENT RR O 10 44081 PERRY, OHIO 44081 NU m R (216) 259-3737 i

March 13 , 1995 PY-CEI/NRR-1923L J

l l

I United States Nuca.'ar Regulatory Commission Document Control Desk' Vashington, D. C. 20555 Perry Nuc.' ear Power Plant Docket No. 50-440 l Inoperable Loose-Part Detection System Instrumentation - Special Report Gentlemen In accordance with the provisions of Perry Technical Specifications , 3.3.7.8 and 6.9.2, the attached Special Report is being submitted to notify the NRC of inoperable Loose-Part Detection System Instrumentation. .

If you have questions or require additional information, please contact Mr. James D. Kloosterman, Manager - Regulatory Affairs at (216) 280-5833.

Very truly yours,

/ N DVCase Attachment cc: NRC Region III NRC Resident Office NRC Senior Project Manager 100045 opemtmg Compows cieveiona Deetne mumina'mg ' U

$3 g

toicoo toeson 9503160343 950313 PDR ADDCK 05000440 S PDR

PY-CEI/NRR-1923L Attcchment Page 1.of 2

[ SPECIAL REPORT - INOPERABLE IAOSE PARTS DETECTION SYSTEM INSTRUMENTATION

, e On February 1, 1995, the Vibration and Loose Parts Monitoring (V& LPM)

System Channels 1 and 4 were declared inoperable subsequent to troubleshooting activities. Pursuant to Technical Specifications 3.3.7.8 and 6.9.2, the following Special Report is being submitted to the Commission within 10 days of one or more V& LPM channels being inoperable for more than 30 days. The thirty day time limit to restore these channels to the operable status was exceeded,on March 3, 1995.

The V&LPH is designed to continuously monitor the Nuclear Boiler for any indication of loose parts in the Nuclear Boiler System. Eight 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 an audible speaker, a db meter, control room annunciator, Loose Parts Events Analysis Computer, and a laser printer.

V&LPH Channel 1 is located on an instrumentation line in the upper plenum of the Nuclear Boilet System. During troubleshooting activities, it was noted that the output signal from the charge amplifier was much lower than expected. The channel was therefore declare inoperable on -

February 1, 1995. Corrective Actions required to return this channel to the operable status include replacement of the charge amplifier and subsequent channel calibration. Calibration is accomplished by using a calibrated manual impact tool to " ping" within 3 feet of the .

accelerometer and verify the system alarms. Since the accelerometer is located inside the Dryvell, this channel vill remain out-of-service until a Dryvell entry can be performed during the next plant _ outage of .

sufficient duration. l During this same time period, troubleshooting was also performed on V& LPM Channel 4 to identify the source of electrical spiking signals. This channel monitors the "B" feedvater line. Equipment outside of the Dryvell capable of producing electrical spiking signals was verified to be working properly.and, therefore, not the source of the electrical.

spiking signals being experienced on Channel 4. Based on this, it has ,

been concluded that the source of the electrical spiking signals is '

associated with equipment inside of the Dryvell. During the next plant outage of sufficient duration, further troubleshooting vill be performed i to identify and correct the source of this equipment problem. This channel is currently disabled to prevent spurious nuisance alarms. It should be further noted that site personnel have concluded that the signals did not result from a loose part.

i i

.w j PY-CEI/NRR-1923L 'l Attcchment . '

Page 2 of 2 ,

Vith fhannels 1 and 4 out-of-service, six (6) of eight (8) installed.  :

M LPM channels remain _ operable, and.the V&LPH system still meets the-  :

. intent of Regulatory Guide 1.133 by maintaining at least'two sensors +

operable at each natural ~ collection region (reactor vessel upper and

• lower plenums). Therefore,-continued plant operation with Channels 1 ,

and 4 out-of-service is acceptable.-

t h

a f,

I 6

l l

-_ _ _ _ _ _ _ _ . _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _