ML17279A416

LER 87-016-00:on 870622,control Room Emergency Filtration Sys Automatically Initiated Due to Failure of Trip Logic to Reset During Performance of Reactor Bldg Exhaust Radiation Monitor Surveillance Procedure.Cause unknown.W/870722 Ltr

ML17279A416
Person / Time
Site:	Columbia
Issue date:	07/22/1987
From:	Arbuckle J, Powers C WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
LER-87-016, LER-87-16, NUDOCS 8707290143
Download: ML17279A416 (7)

Text

~UL Y INFORMATION DISTF UTl SYSTEM (RIDS)

ACCESSION NBR: 8707290143 DOC. DATE: 87/07/22 NOTARIZED: NO DOCKET FACIL: 50-397 WPPSS Nuclear Progecti Unit 2i Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION ARBUCKLEi J. D. Washington Public Power Supply System POWERS'. M. Washington Public Power 'Supply System RECIP. NAME 'ECIPIENT AFFILIATION

SUBJECT:

LER 87-016-00: on 870622'ontrol room emergency filtration sys automatically initiated due to failure of trip logic to reset during performance of reactor bldg exhaust radiation monitor surveillance procedure. Cause unknown. W/870722 ltr.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: 50. 73 Licensee Event Report (LER) i Incident Rpti etc.

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 ~

1 PD5 PD 1 1 SAMWORTHi R 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TPAB 1 DEDRO 1 1 NRR/DEST/ADE 1 0 NRR/DEST/ADS 1 0 NRR/DEST/CEB 1 1 NRR/DEST/ELB 1 1 NRR/DEST/ICSB 1 NRR/DEST/MEB 1 1 NRR/DEBT/MTB 1 NRR/DEST/PSB 1 1 NRR/DEBT/RSB 1 1 NRR/DEST/SQB 1 1 NRR/DLPG/HFB NRR/DLPG/GAB 1 1 NRR/DOEA/EAB 1 1 NRR/DREP/R*B 1 NRR/DREP/RPB 2 2 ILRB 1 1 NRR/PMAS/PTSB 1 1 REQ FILE 02 1 RES DEPY QI 1 1 ELFORDi J 1 RES/DE/EIB 1 RQN5 FILE 01 '1 1 EXTERNAL: EQ5Q QROHi M 5 5 H ST L'OBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS' 1 1 NSIC MAYST Q 1 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 45 ENCL 43

1 LICENSEE EVENT REPORT tLER)

SACELITY saba III Washington Nuclear Plant - Unit 2 o 0 o 0 o 39 7>or 3 on ro oom mergency F> tration System Actuation Due to Failure of Relay to Reset Durin Surveillance - Cause Unknown EVENT OATE ta LEO lasagna IEI IITIAL INHITH CAY 'EAII N~h MONTH OAY 0 5 0 0 0 2 8 0 I 0 0 0 2 2 0 5 0 0 0 THE hEIWIN~NTE OS IE CSh f (Chest ~m asee &~ heeaQV IIII

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OATS 114 I YEE DI Sw, cehNNI CÃPfCTFD EVE4NEOON DATe I late N ICONS, Ia. aWWNNINNS aMeeeeN tyyearttm Meeal 1141 On June 22, 1987 at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br />, the Control Room Emergency Filtration System automatically initiated. The initiation was the result of the failure of the trip logic to reset during the performance of a Reactor Building Exhaust Radiation Monitor surveillance procedure. The'trip logic failed to reset when Plant personnel depressed the reset pushbuttons during the procedure. This caused there to be a half-trip condition in existence and, when Plant personnel continued with the procedure, another half-trip occurred which resulted in the automatic start of the Emergency Filtration System.

An investigation did not reveal the cause of the failure of the trip logic to reset. Plant personnel attempted to reproduce the failure by re-performing applicable sections of the procedure, but the condition could not be duplicated.

There is no safety significance associated with this event as there was no actual initiating condition and all equipment operated correctly to place the Control Room Ventilation System in an isolation condition.

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~~NRC re lant Conditions maKlllTl 2 0 s o 0 o 3 9 7 8 7 0 16 00 2 pFO 3 a) Power Level - 0%

b) Plant Mode - 4 (Cold Shutdown)

Event Descri tion On June 22, 1987, at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br />, a Control Room Emergency Filtration System Fan (WMA-FN-54B) automatically started. The automatic start was the result of the failure of a relay (E-RLY-CR3BX: Division II .Isolation Control Relay - FAZ) to reset during the performance of Plant Procedure 7.4.3.2. 1. 15, "Secondary Containment Isolation Reactor Building Vent Radiation CFT." The procedure provides instructions for performing the Channel Functional Test for Reactor Building Exhaust Air Plenum Radiation Monitor REA-RIS-K609D.

The relay, which provides one trip channel input to WMA-FN-54B, failed to reset when Plant personnel depressed reset WMA Reset Pushbuttons 3BX and 3BY. This caused there to be a half-trip condition in existence and, when Plant personnel continued with the procedure, another relay (E-RLY-CR3BY: Containment I.solation Relay) trip occurred, resulting in the automatic start of WMA-FN-54B.

An investigation did not reveal the cause of the failure of E-RLY-CR3BX to reset. Plant personnel attempted to reproduce the failure by re-performing applicable sections of the procedure, but the condition could not be duplicated.

Immediate Corrective Action After aerification that no actual initiating condition existed, the Control Room Emergency Filtration System was returned to normal lineup.

Further Corrective Action

1. A plant modification document has been prepared to identify the need to include contacts from Relays CR3AX/CR3AY (from RC-1) and CR3BX/ CR3BY (from RC-2) in the RC-1 and RC-2 half-trip annunciator circuits. The modification would provide indication that all-half-trip logic was reset when the half-trip annunciator cleared.

2. Further investigation will be performed in an attempt to determine why the trip logic failed to reset.

Safety Si nificance There is no safety significance associated with this event as there was no actual initiating condition and all equipment operated correctly to place the Control Room Ventilation System in an isolation condition.

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NhC fona 35EA. U~ NUCLEAII hEOULATONY COMM(55(ON (0451 UCENSEE EVENT REPORT tLER) TEXT CONTlNUATION APPROVEO OME NO. 5(50-0(OA EXPINEE: 5/51155 PACILITY NAIVE 111 OOCXET NLNNEh (5( LEh NUMEEh (5( PAOE (5(

YEAN A~K SEQUENTIAL SION N M h N M TA Washington Nuclear P1ant - Unit 2 39. 787 0 1 6 0 0 3 0 3 0 6 0 0 0 OF TECT (>> nWe T>>AT>> (P nasl'NP a4AASal A(hC Anh ~(U (IT)

Similar Events LERs85-027, 85-036 and 87-009 E I IS Text Reference EIIS Reference System Component Contro1 Room Emergency Fi1tration System VH REA-R IS-K609D VA RI S NIIC SOllM 544A (5451

ti WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.o. Box 968 ~ 3000 George Washington Wa)> ~ Richland, Washington 99352 Docket No. 50-397 July 22, 1987 Document Control Desk U.S. Nuclear Regulatory Commission Washington; D.C. 20555

Subject:

NUCLEAR PLANT NO. 2 LICENSEE EVENT REPORT NO.87-016

Dear Sir:

Transmitted herewith is Licensee Event Report No.87-016 for the WNP-2 Plant. This report is submitted in response to the report requirements of 10CFR50.73 and discusses the items of reportability, corrective action taken, and action taken to preclude recurrence.'ery truly y urs,

)

C.M. owers (M/D 927M)

WNP-2 Plant Manager CMP:mt

Enclosure:

Licensee Event Report No.87-016 cc: Mr. John B. Martin, NRC - Region V Mr. R. T. Dodds, NRC Site (M/D 901A)

INPO Records Center - Atlanta, GA Ms. Dottie'Sherman, ANI Mr. D. L., Williams, BPA (M/D 399)