ML112780151

LER 79-003/01T-0 on 790301:containment Vent & Purge Isolation Valves Would Not Close During DBA-LOCA.Cause Unknown.Fisher Continential 18 & 20 Inch,Type 9220 Butterfly Valves Opening Is Administratively Controlled

ML112780151
Person / Time
Site:	Monticello
Issue date:	03/15/1979
From:	Goranson R Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112780152	List: 05000263/LER-1979-003, Forwards LER 79-003/01T-0 ML112780151
References
LER-79-003-01T, LER-79-3-1T, NUDOCS 7903200408
Download: ML112780151 (3)

Text

REGATORY INFORMATION DISTRIB@ON SYSTEM (RIDS)

ACCESSION N8R37903200408 DOC.DATE: 79/03/15 NOTARIZED: NO DOCKET #

FACIL:50*263 MONTICELLO NUCLEAR GENERATING PLANT, NORTHERN STATES 05000263 AUTH.NAME AUTHOR AFFILIATION GORANSONR. NORTHERN STATES POWER CO.

RECIPONAME RECIPIENT AFFILIATION REGION 3, CHICAGO, OFFICE OF THE DIRECTOR SUBJECT$ LER 79*003/01T0 ON 790301:CONTAINMENT VENT & PURGE ISOLATION VALVES WOULD NOT CLOSE DURING DBA-LOCA.CAUSEI UNKNOWNFISHER CONTINENTIAL 18 & 20 INCH,150#rTYPE 29220 BUTTERFLY VALVES OPENING ADMINISTRATIVELY CONTROLLED.

DISTRIBUTION CODE: A0028 COPIES RECEIVED:LTR ENCL .J SIZEI TITLE: INCIDENT REPORTS NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME: LTTR ENCL ID CODE/.NAME LTTR ENCL ACTION: 05 BC 6" + 3 4 4 INTERNAL REG FILE; 1 02 NRC POR 11 MPA 1 1 14 TA/,EDO 15 NOVAK/,KNIEL, 1 16 EEB 17 AD FOR ENGR 1 1 1 18 PLANT SYS BR 19 I&C SYS BR 1 1 1 20 AD PLANT SYS 21 AD SYS/PROJ 1 1 22 REAC SAFT BR 1 23 ENGR BR 1 1 1 24 KREGER 25 PWR SYS BR 1 1 1 26 AD/,SITE ANAL 27 OPERA LIC BR 1 1 1 28 ACDENT ANLYS 29 AUX SYS BR 1 E JORDAN/IE' 1 EXTERNALI 03 LPOR 1 1 04 NSIC 1 1 29 ACRS 16 16 jaw , i~

404, TOTAL NUMBER OF COPIES REQUIRED: LTTR 46 ENCL' 46

NORTHERN STATES POWER COMPANY MINNEAPOLIS, MINNESOTA 55401 March 15, 1979 Mr J G Keppler Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Vent Isolation Valve Design Problem The Licensee Event Report for this occurrence is reproduced on the back of this letter. Enclosed are three copies.

This event is reported in accordance with Technical Specification 6.7.B.l.i in that components were found which may perform in a less con servative manner than that assumed in safety analyses.

Yours very truly, L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/deh cc: Director, IE, USNRC (40)

Director, MIPC, USNRC (3)

MPCA Attn: J W Ferman

-over-

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I J. !;. Ni J(:I I All III Gt JA Al ()It Y CO(MMVIUIN NOW I Oil

(/.7/) INTERIM REPORT LICENSEE EVI NI HLPOiH I cONII0 LOCK. K I (D (PLEASE PRINT Oil TYPE ALL REQUIRED INFORMATION)

[ED IMINI MINI P1 1 01 olo1 l0l 00lo0ol-l0.0lol25 26 411LICENSE 1l111 TYPE 30 I(L_" 57 CAT 58 G5) 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBL CON'T RUORE I 1 01 5101_0 10121 61 0 13 691 10111 7 19 7410 75 113REPORT 111R DATE 5A 7 9so 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES l WHILE AT STEADY STATE POWER, NRC NOTIFIED NSP THAT CONTAINMENT VENT AND PURGE IISOLATION VALVES WOULD POSSIBLY NOT CLOSE DURING DBA-LOCA. VERBAL CONFIRMATION I 0O4 ITHAT VALVES WILL NOT CLOSE RECEIVED FROM VALVE MANUFACTURER, REPORTABLE UNDER I I TECHNICAL SPECIFICATION 6.7.B.1.i. NO PREVIOUS SIMILAR OCCURRENCES. NO AFFECT l 7

09T]8 I ON THE PUBLIC HEALTH AND SAFETY,

[7T B 78 80 SYSTEM CAUSE CAUSE COMP. VALVE SUBCODE w

CODE CODE SUBCODE COMPONENT CODE SUBCODE ISI DI (3J 1L (3 1Zj I VI Al LI VI El XI3 LI0( 19 20 G

9 10 11 12 13 18 SEQUENTIAL OCCURRENCE REPORT REVISION CODE TYPE NO.

LERRO EVENT YEAR REPORT NO.

23 24 3226 27 29 30 31 32 S 21 22 SHOT DOWN ATTACHMENT NPR 4 PRIMECOW. COMPONENT EPPECT 1oIloo I ACTION FUTURE FORM SU SUPPLIER MANUFACTURER TAKEN ACTION ON PLANT METHOD HOURlS 2) SUMTTED LJ@Ll@ LO@7 LzJ(D L@ Ll@

42 LLJ(121 43 44 47 33 34 35 36 37 40 41 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS - In l %fl*r*ICTNO rA I CAUSE OF OCCURRENCE IS UNKNOWN. AT THI S TIME, FISHER CONTINENTIAL 1.8 q20 LINCHf 1.U5tt S I TYPE 9220 BUTTERFLY VALVES. OPENING OF VALVE ADMINISTRATIVELY CONTROLLED TO ASSURF I I CLOSURE UNDER ACCIDENT CONDITIONS. NVESTIGATION IS CONTINUING IN CONJUNCTION I WITH THE MANUFACTURER.

7 8 9 METHOD OF

%POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION FSATLSY E J( 1 l 0 10 @lNA L[ OI NOTIFICATION BY NRC 11 44 45 46 80 7 8 9 10 12 ACTIVITY CONTENT OF HELEASE AMOUNT or ACTIVITY LOCAT ION OF RELEASE RELEASED I NA EE ziB LzJ(l NA 7 8 9 10 11 44 4I 45 80I 80 PERSONNEL EXPOSURES NUMBER TYPr DESCRI'TION

[ 01I 01 o L I NA 80 7 8 9 11 12 13 PERSONNEL INJURIES NUMR" DESCI P T10 N 8

[1 8 I al1 018I 9 11 12 NA 80 I O'S OF OR DAMAGE TO FACILITY TYPE DESCRIPTION E[ELzJ@I 1 8 9 10 NA so PUII TY N3C LSE ONLY ziI P SLZO81 NA 6.8 69 80

/ I 9 10 0

NAME OF PREPAREH IONE (612) 295-5151 19,?0320T lo0g