ML20154L308

Special Rept 88-004-00:on 880409,inoperable Channel 2 Loose Parts Monitor Not Repaired within 30 Days,Per Tech Spec 3.3.7.9.Cause Undetermined.Repair of Monitor Scheduled for Next Planned Cold Shutdown Outage

ML20154L308
Person / Time
Site:	Hope Creek
Issue date:	05/18/1988
From:	Ervin A, Labruna S Public Service Enterprise Group
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-004-00, 88-4, NUDOCS 8805310246
Download: ML20154L308 (4)

Text

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O PSEG Pubhc Service Electric and Gas Company P.O. Box L Hancocks Bridge, New Jersey 08038 Hope Creek Operations May 18, 1988 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Dear Sir:

HOPE CREEK GENERATING STATION DOCKET NO. 50-354 UNIT NO. 1 SPECIAL REPORT 88-004-00 This Special Report is being submitted pursuant to the requirements of Hope Creek Technical Specification 3.3.7.9.

Sincerely, 7 5, Lab ^

S. LaBruna '

General Manager - ,

Hope Creek Operations l

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1. ACluTY asA484 di DOC K E T NuMSS R Qi PAGEi3 Hope Creek Generating Station o 15 l o t o l o l3 f 5 l4 1lodol3 rif ts im Channel 2 Loose Parts Monitor (LPM) Inoperable for More Than Thirty (30) Days -

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On April 9, 1988 at 0930 hours, The Plant was in OPERATIOliAL CONDITIO!! 4 (Cold Shutdow:.) at 0% power generating 0 MWe.

4 At l that tine Channel 2 LPH was determined to be inoperable. A 60 (

Hz noise in the LPH output was observed. The action statement i of Technical Specification 3.3.7.9 was entered. Since the LPM was not repaired within 30 days, a ten (10) day Special Report {

i is required. The root cause of this occurrence has not been determined but is presumed to be either a malfunction of LPH sensors or a faulty cable. The repair of the channel 2 LPH is scheduled for the next planned cold shutdown outage.

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l 0 l2 rur =, . = .mmmw anc e > maamm PLANT AND SYSTEM IDENTIFICATION General Electric - Boiling Water Reactor (BWR/4)

Loose Parts Monitoring System (EIIS Designator:II)

IDENTIFICATION OF OCCURRENCE Channel 2 Loose Parts Monitor (LPM) Inoperable for More Than Thirty (30) Days - Cause Undetermined Event Date: April 9, 1988 Event Time 0930 Hours This LER was initiated by Incident Report No.88-091 CONDITIONS PRIOR TO OCCURRENCE The Plant was in OPERATIONAL CONDITION 4 (Cold Shutdown) at 0%

power generating 0 MWe.

DESCRIPTION OF OCCURRENCE On April 9, 1988 at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, Channel 2 LPM was determined to be inoperable. A 60 Hz noise in the LPH output was observed. The action statement of Technical Specification 3.3.7.9 was entered. Since the LPM was not repaired within 30 days, a ten (10) day Special Report is required.

APPARENT CAUSE OF OCCURRENCE The root cause of this occurrence has not been determined but is presumed to be either a malfunction of LPH sensors or a faulty cable.

ANALYSIS OF OCCURRENCE The Channel 2 LPM passed its channel calibration during the refueling outage with the 60 Hz noise present. The LPM was declared inoperable because it failed the daily channel check due to the presence of the 60 Hz noise. However, significant loose parts signals are normally in the 20 KHz range and would be detectable above the 60 Hz noise as confirmed by the channel calibration.

When. Channel 2 of the LPH System was declared inoperable, the plant was returning to power from a refueling outage. On April 13, 1988 the reactor was in OPERATIONAL CONDITION 2 at 3% power when an attempt was made to troubleshoot and repair the LPM by changing out the charge amplifiers. This repair, however, did not eliminate the 60 Hz noise. Further troubleshooting and/or repair of this problem was postponed because the temperature y,....

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l 0l3 0l3 rm <<- . anc % asiaw on ANALYSIS OF OCCURRENCE (CONTINUED) at the higher drywell elevation where the sensors and cables are located was already above workplace standards for non-emergency occupancy.

Following the scram which occurred on April 30, 1988, a drywell entry to attempt further repair was considered again. Again, it was concluded that the high temperature in the drywell made entry for an extended time unacceptable.

PREVIOUS OCCURRENCES A previous occurrence in which The Loose Parts Monitoring System (LPMS) was declared inoperable was reported in Special Report 86-002-00. On that occasion the LPMS was declared inoperable because of inadequate calibration. The return of the LPMS to operability was delayed by deficiencies in vendor information and components.

SAFETY ASSESSMENT The LPMS is intended to be used for information purposes only and is not a safety-related system. For this reason the declared inoperability of one channel of the LPMS cannot compromise the health and safety of the public.

REPORTABILITY This report is being submitted pursuant to the requirements of Technical Specification 3.3.7.9.

CORRECTIVE ACTIONS

1. The repair of the channel 2 LPH is scheduled for the next planned cold shutdown outage.

Sincerely,  !

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S. LaBruna I General Manager -

Hope Creek Operations AME:

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