ML17290A838

Special Rept:On 931126,main Control Room Received Stack Monitor Sys Trouble Annunciator & Status Display Indicated High Range Channel Failed self-test.Caused by Component Failure of Stack Monitor Detector.Replacement in Progress

ML17290A838
Person / Time
Site:	Columbia
Issue date:	12/10/1993
From:	Parrish J WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
GO2-93-290, NUDOCS 9312230135
Download: ML17290A838 (4)

Text

ACCELERATED DISTRIBUTION DEMONS~TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9312230135 DOC.DATE: 93/12/10. NOTARIZED: NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION PARRISH,J.V. Washington Public Power Supply System RECIP.NAME . RECIPIENT AFFILIATION NOTES'i FAULKENBERRY,B. Region 5 (Post 820201)

SUBJECT:

Special rept:on 931126,main control room received stack monitor sys trouble annunciator & status display indicated I '

high range channel failed self-test. Caused by component fax.lure of stack monitor detector. Replacement in progress.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ) ENCL I SIZE:

TITLE: '50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc, RECIPIENT A

COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D PDV LA 1 1 PDV PD 1 CLIFFORD,J 1 ~1 1 INTERNAL: ACRS 2 2 AEOD/DOA 1- 1 AEOD/DS P/TPAB 1 1 AEOD/ROAB/DSP 2 2 NRR/DE/EELB 1 1 NRR/DE/EMEB 1 1 NRR/DORS/OEAB NRR/DRCH/HICB 1

1

=1 1

NRR/DRCH/HHFB NRR/DRCH/HOLB 1

1

.1 NRR/DRIL/RPEB 1 1 NRR/DRSS/PRPB 2 2 RRQBSSA. SPLB. 1 1 NRR/DSSA/SRXB 1 1 GF E 02 1 1 RES/DSIR/EIB 1 1 RGA FILE 01 1 1 EXTERNAL: EG&G BRYCE,J.H 2 2 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHY,G.A 1 1 NSIC POORE,W. 1 l. NUDOCS FULL TXT 1 1 D

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NOTE TO ALL "RIDS" RECIPIENTS:

-S PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 30 ENCL 30

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Bax 968 3000 Geode Washington Way Richland, Washington 993524968 0'09) 372-5000 December 10, 1993 G02-93-290 Docket No. 50-397 Mr. B.'H. Faulkenberry Regional Administrator VS Nuclear Regulatory Commission Region V 1450 Maria Lane Walnut Creek, CA. 94596

Subject:

%iiP-2, OPERATING LICENSE NO. NPF-21 SPECIAL REPORT: REACTOR BUILDINGEFFLUENT MONITORING SYSTEM This special report is submitted pursuant to the requirements of WNP-2 Technical Specification Section 3.3.7.5, "Accident Monitoring Instrumentation." This Technical Specification includes Table 3.3.7.5-1, Item 31, "Reactor Building Effluent Monitoring System." Item 31 references Action 81 which states: "With the number of OPERABLE accident monitoring instrumentation channels less than required by the Minimum Channels OPERABLE requirement, either restore the inoperable channel(s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, or:... In lieu of any other report required by Specification 6.9.1, prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 14 days following the event outlining the action taken', the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status." At 0854 hours0.00988 days <br />0.237 hours <br />0.00141 weeks <br />3.24947e-4 months <br /> on November 29, 1993, the Reactor Building Effluent Monitoring System was inoperable for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> requiring the submittal of this special report.

E~D

~ EE On November 26, 1993 at 0854 hours0.00988 days <br />0.237 hours <br />0.00141 weeks <br />3.24947e-4 months <br />, the Main Control Room received a "Stack Monitor

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'System Trouble" annunciator. The. Stack Monitor Status Display indicated that the high range channel (PRM-RE-1C) had failed its self-test. The stack monitor is part of the Reactor Building Effluent Monitoring System which is required to be in service during Operating Conditions 1, 2, and 3 in accordance with Technical Specification Table 3.3.7.5-1 (Item 31).

210064 9312230135 931210 PDR ADOCK 05000397 S PDR

Page Two i

SPECIAL REPORT: REACTOR BUILDINGEFFLUENT MONITO~G SYSTEM Action Taken" Immediate corrective action was taken to declare the stack mohitor inoperable. The System Engineer was then notified and Limiting Condition for Operation (LCO) 3.3.7.5 Action Statement No. 81 was entered to initiate the preplanned alternate monitoring method and submit this'pecial report.

Troubleshooting by the System Engineer on November 26, 1993 indicated a failure of the cryogenically cooled stack monitor detector. Additional troubleshooting on November 28, 1993 confirmed the initial findings. The equipment vendor (EG&G ORTEC) was contacted on November 29, 1993 for assistance in determining the location of the fault. Because the stack monitor detector requires a controlled warm-up and,cooldown from 70'elvin (-333.4'), a process that takes approximately 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, the vendor recommended replacement of several components within the detector preamplifier before proceeding with detector replacement. The vendor supplied preamplifier components were installed on December 2, 1993 but subsequent testing on December 3, 1993 indicated that the fault had not been corrected. The vendor determined that the fault was internal to the stack monitor detector, requiring replacement.

a e of he In era ili The cause of the Reactor Building Effluent Monitoring System inoperability was a component failure of the stack monitor detector. However, the cause of the detector failure has not been determined because the fault apparently resides within the high-vacuum, sealed detector canister.

The detector will be returned to the v'endor for warranty repair.

lan and chedule for Rest rin the System t rable tatus The stack monitor detector replacement work is currently in progress with completion of installation.and calibration expected by December 17, 1993.

Sincerely

. V. Parrish (Mail Drop 1023)

Assistant Managing Director, Operations CDM/bk CC: Document Control Desk NS Reynolds - Winston & Strawn'W Clifford - NRC DL Williams - BPA/399 NRC Site Inspector - 927N

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