ML20044D536

LER 90-001-05:on 900313,design Deficiencies Noted in Emergency Filter Train Sys.On 930315,determined That Train B of CR Emergency Filtration Sys Could Not Provide Adequate Flow.Alternate Measuring Sys Method Implemented

ML20044D536
Person / Time
Site:	Monticello
Issue date:	04/14/1993
From:	Andrew Ward NORTHERN STATES POWER CO.
To:
Shared Package
ML20044D531	List: ML20044D529 ML20044D536 ML20044D538
References
LER-90-001-01, LER-90-1-1, NUDOCS 9305190269
Download: ML20044D536 (2)

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4 I MRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED B7 OMB NO. 3150-0104 5R EXPIRES 5/31/95 E EDMA'E D BURDEN PER RE SPONSE TO COMPLY wrTH TH:S fNEORMATION COufCTION BEOJEE $0 0 HRS- FO4esARD cOMMt.cs REaAR3Na saRaEN E s,T LICENSEE EVENT REPORT (LER) McE w mt mOnManON IND nECORDS MANAGEMI Nt (RANCH fMNB9 7M4;. U S NUCLEAR HEGJJ'ORY COMM SSON, WASHN3 TON, DC 70SSSEXn, AND TC THE FAPERWORw REDUCTION PR3 JECT O'54 0104;, OrrE,E OF (See reverse for required number of digits. characte<s for each block) uAsacEuENT AN BUoseT. wasnN3 TON nc awa

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f ACILITY hAME p) DOCAET NUMBER p) F AGE (3) 3 MONTICELLO NUCLEAR GENERATING PLANT 05000 263 1OF11 l N i Potential Emergency Filter Train System Inoperability Due To interaction With Non-Safety Related Equipment EVENT DATE (5) LER NUMBER (61 REPORT NUMBER (7) OTHER FACILITIES INVOLVED (8) sfMN% PRSON fA YWE W4 T WMD MONN DAV VEAR YEAR A'O*sTM DAY YEAR gg g 05000 F AGUTY NAVE pgc,(g7 Nggg[q

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03 15 93 90 001 05 04 14 93 05000 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR 4: (Cneck one or morel (11) l L MODE (9) N 20 4':2:b) 20 405(c) 50J3:aH2)(w) 73.71(b)

POWER 20 4051aH1HO 50 36te)(1) XX $0.73ta)(2)S) 73.71(c)

LEVEL (10) 1007 20 405laH1100 50 36tcH2) 50 73(aH2Hvu) OTHER 20 405(a81104 XX 50 73(aH2)(i) 50.73(a)(2Hvm)(A) SP% m Areact 20 405;aH1)ov) 5073;aH2)(u) 5073(aH2)(vm)(B) rN((y 20 405(aH1 Hv) } 5013(aH2)Cn) 50 73faH2)(x)

I LICENSEE CONTACT FOR THIS LER (12)

VVE ILLLN10NE NUMdt h Mctuoe A'ee CooH 1 i Anne Ward, Superintendent Reactor Systems Engineering (612) 295-1256 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

CAJSE OMM COMmM N' MtNJT AC'JRi A S* S'EM COMPONENT f CAUSE MANUT AOTURE R SUPPLEMENTAL REPORT EXPECTED (14) EXPECTED MON'N DAY 4A4 l r YES

,o SUBMISSION M rn mwe D?tC ED SuBuiSiON D8'E! XX DATE (15)

ABSTRACT (Ltmit to 1400 spaces, i e., approximate'y 15 single spaced typewntten lines) (16) E This is Revision 5 of a Licensee Event Report originally submitted on April 12, 1990. l .

The supplemental report concerns the discovery of an additional system design deficiency.

On March 13, 1990, design deficiencies in the Emergency Filter Train (EFT) system, and systems which interact with the Emergency Filter Train system were discovered during a i special test. Immediate corrective actions were taken to isolate and secure various ventilation units and ductwork to prevent Safety Related/Non-Safety Related systems interaction and ensure operability of the Emergency Filter Train system. An evaluation was completed for the 250 VDC battery for elevated air temperatures and a modification l vas completed to provide a redundant method to block air flow to the battery room from the EFT.

On March 15,1993, it was determined that the "B" train of the Control Room Emergency Filtration system could not supply adequate pressurizing flow when operated just above the low flow trip set point. This was caused by a design deficiency. Administrative controls have been initiated to maintain the "B" Filtration train flow controller in ,

manual and the "B" train of the Control Room Emergency Filtration system in lag with the l "A" Filtration train in lead. An alternate method of measuring system flow though the "B" Filtration train of the Control Room Ventilation EFT system has been implemented and surveillance procedures have been revised.

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