ML17291A696

Special Rept:On 950305,reactor Bldg Effluent Monitoring Sys Was Inoperable for 72 Hrs.Caused by Failure of Stack Monitor Detector.Stack Monitor Returned to Svc on 950314

ML17291A696
Person / Time
Site:	Columbia
Issue date:	03/16/1995
From:	Parrish J WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Callan L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
GO2-95-053, GO2-95-53, NUDOCS 9503210444
Download: ML17291A696 (3)

Text

~L~~J. L X (ACCELERATED RIDS PROCESSING j

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9503210444 DOC.DATE: 95/03/16 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 CALLAN,L. J. Region 4 (Post 820201)

SUBJECT:

Special rept: on 950305,reactor bldg effluent monitoring sys was inoperable for 72 hs,requiring submittal of special rept.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER), ncident Rpt, etc.

NOTES RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME PD4-2 PD LTTR ENCL ID CODE/NAME LTTR ENCL CLIFFORD,J INTERNAL: ACRS AEOD/S.PD/- B AEOD/SPD/RRAB LE CEN 02 NRR/DE/ECGB NRR/DE/EELB NRR/DE/EMEB NRR/DISP/PIPB ~

NRR/DOPS/OECB NRR/DRCH/HHFB NRR/DRCH/HICB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SPLB NRR/DSSA/SRXB RES/DSIR/EIB RGN4 FILE 01 EXTERNAL: L ST LOBBY WARD LITCO BRYCE,J H NOAC MURPHY,G.A NOAC POORE,W.

NRC PDR NUDOCS FULL TXT NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 504-2083 ) TO ELIMINATEYOUR NAME FROM DISTRIBUTIONLISTS I'OR DOCUMENTS YOU DON'T NL'ED!

TOTAL NUMBER OF COPIES REQUIRED'TTR 28 ENCL

WASHINGTON PUBLIC POWER SUPPLY SYSTEM iP.O. Box 968 ~ 3000 George Washington Ray ~ Richland, Washington 99352-0968 ~ (S09) 372->000 March 16, 1995 G02-95-053 Docket No. 50-397 L. J. Callan Regional Administrator V.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064

Subject:

WNP-2, OPERATING LICENSE NPF-21 SPECIAL REPORT: REACTOR BUILDINGEFFLUENT MONITORINGSYSTEM This special report is submitted pursuant to the requirements of WNP-2 Technical Specification Section 3.3.7.5, "Accident Monitoring Instrumentation," including 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 Mnimum 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: ... prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 14 days following the event..." At 0629 hours0.00728 days <br />0.175 hours <br />0.00104 weeks <br />2.393345e-4 months <br /> on March 5, 1995, 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.

Event De cri ti n The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Technical Specification Action Statement for the Reactor Building Effluent Radiation Monitor High Range Detector was entered at 0629 hours0.00728 days <br />0.175 hours <br />0.00104 weeks <br />2.393345e-4 months <br /> on March 2, 1995, when the high range stack monitor (PRM-RE-1C) failed a self-test. The self test is an internal diagnostic which is performed every two hours. On failure, the Main Control Room received a "Stack Monitor System Trouble" annunciator. The stack monitor is part of the Reactor Building Effluent Monitoring System which is required to be in service during Operational Conditions 1, 2, and 3 in accordance with Technical Specification Table 3.3.7.5-1, Item 31.

9503210444 9503ib PDR 4DOCK 05000397 S PDR

Page 2 SPECIAI REPORT: REACTOR BUILD1NG EFFLUEiVI'ONITORING SYSTEM Action Taken The Backup Emergency Dose Projection System was verified operable as the preplanned alternate monitoring method in accordance with Table 3.3.7.5-1 Action 81 requirements and was initiated at 2355 hours0.0273 days <br />0.654 hours <br />0.00389 weeks <br />8.960775e-4 months <br /> on March 4, 1995.

A work request was initiated to identify and correct the component failure. Repair investigation verified a detector failure had occurred. Detector replacement is a lengthy process and requires a controlled warm-up and cooldown. The entire process, including the warm-up and cooldown, takes approximately 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. Available replacement detectors were installed, however, post-maintenance testing found that detector replacements did not resolve the inoperability. The manufacturer was contacted in support of the repair and return to service of a detector. A detector was repaired, a vacuum was restored, and the cooldown to normal operating temperature (< 77 Kelvin) completed.

ause the In era ili The cause of the Reactor Building Effluent Monitoring System inoperability was failure of the stack monitor detector.

te tatu The stack monitor detector was returned to service at 2100 on March 14, 1995.

Should you have any questions or desire additional information regarding this matter, please call me or D. A. Swank at (509) 377-4563.

Sincerely I

. V. Pamsh (Mail Drop 1023)

Vice-President, Nuclear Operations JVP/LCF/ml CC: KE Perkins, Jr. - NRC RIV, Walnut Creek Field Office NS Reynolds - Winston & Strawn JW Clifford - NRC DL Williams - BPA/399 NRC Sr. Resident Inspector - 927N NRC Document Control Desk