05000263/LER-1979-011-03, /03L-0 on 790529:no Min Flow in B Train Standby Gas Treatment Sys.Caused by Dilution Flow from Compressed Storage Not Isolated by BV-5.Replaced Positioner & Installed Filter in Cylinder Supply/Return Line

/03L-0 on 790529:no Min Flow in B Train Standby Gas Treatment Sys.Caused by Dilution Flow from Compressed Storage Not Isolated by BV-5.Replaced Positioner & Installed Filter in Cylinder Supply/Return Line

ML112900856
Person / Time
Site:	Monticello
Issue date:	06/28/1979
From:	Iverson O Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112900857	List: 05000263/LER-1979-011, Forwards LER 79-011/03L-0 05000263/LER-1979-011-03, /03L-0 on 790529:no Min Flow in B Train Standby Gas Treatment Sys.Caused by Dilution Flow from Compressed Storage Not Isolated by BV-5.Replaced Positioner & Installed Filter in Cylinder Supply/Return Line
References
LER-79-011-03L-01, LER-79-11-3L-1, NUDOCS 7907030344
Download: ML112900856 (3)

LER-1979-011, /03L-0 on 790529:no Min Flow in B Train Standby Gas Treatment Sys.Caused by Dilution Flow from Compressed Storage Not Isolated by BV-5.Replaced Positioner & Installed Filter in Cylinder Supply/Return Line

Event date:
Report date:
2631979011R03 - NRC Website

text

REGUL*ORY INFORMATION DISTRIBUT@& SYSTEM (RIDS)

ACCESSION NBR:79070303 4 4 DOC.DATE: 79/06/28 NOTARIZED: NO DOCKET FACIL:50-263 Monticello Nuclear Generating Plant, Northern States 05000263 AUTH.NAME t AUTHOR AFFILIATION IVERSON,O.N.

Northern States Power Co.

RECIP.NAME RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director

SUBJECT:

LER 79-011/03L-0 on 790529: no mn flow in B train standby gas treatment syjs. Caused by~ dilution flow from compressed Storage not isolated by BV-5.Replaced positioner & installed filter in cylinder supply return line.

DISTRIBUTION CODE: A002S COPIES RECEIVED:LTR I ENCL /

SIZE:-

L TITLE: INCIDENT REPORTS NOTES:

REC IPIlENT ID CODE/NAME ACTION:

05 BC V8fS INTERNAL: 0 09 I&E 14 TA/EDO 16 EEB 18 PLANT SYS BR 20 AD PLANT SYS 22 REAC SAFT BR 24 KREGER 26 AD/SITE ANAL 28 ACDENT ANLYS E JORDAN/IE TMI DOC CENTER EXTERNAL: 03 LPDR 29 ACRS COPIES LTTR ENCL 4

4 1

12 1

1 1

1 1

1 1

1 1

16 1

2 1

1 1

1 1

1 1

1 1

1 16 RECIPIENT ID CODE/NAME 02 NRC PDR 11 MPA 15 NOVAK/KNIEL 17 AD FOR ENGR 19 I&C SYS BR 21 AD SYS/PROJ 23 ENGR BR 25 PWR SYS BR 27 OPERA LIC BR 29 AUX SYS BR HANAUERS.

04 NSIC LCO IESNCL 1

1 1

1 1

1 3

1 1

1 1

1 1

1 1

1 1

JUL 6 M9.

48 ENCL 48 TOTAL NUMBER OF COPIES REGUIRED: LTTR

9 0

.4 NORTHERN STATES POWER COMPANY MINNEAPOLIS. MINNESOTA 55401 June 28, 1979 Mr J G Keppler Office of Inspection &

U S Nuclear Regulatory 799 Roosevelt Road Glen Ellyn, IL 60137 Enforcement Commission WREV9RY BUCKET FILE COP

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 SBGT "B" Train Low Flow The Licensee Event Report for this occurrence is reproduced on the back of this letter.

Enclosed are three copies.

This event is reported in compliance with Technical Specification 6.7.B.2.b since it represents operation in a degraded mode permitted by the Limiting Conditions for Operation.

Yours very truly, L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/jh cc:

Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn:

J W Ferman

- over-7907030316 M4SPF 66I W""

'5111

7 8

CON'T 7

8 78 08F2 FO78 7

8 1

1 7

8 9 FACILITY O

STATUS

%POWER OTHER STATUS 7

E 1 0 10l5 1 6 II NA L

7 8

9 10 12 11 44 ACTIVITY CONTENT 789 01 NA RE EA ED OF IELE1AM.

AM OUN I F0 AC tITV1Y 7

8 9

10 1144 PERISONNEL FXPOSUIIES NIJMIlfIT TYPF

)rSCrIPTION 0 CID I

oD aYP 011 (Sl ZI~I0I0I0J IJI NA 7

8 9

11 12 1:1 PERSONNEL INJUIIIES NUMRE" r)ESCIlP TION 1]

I ol. 01 ol@l NA 1

8 9

11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

[

ZLO@l NA 1

8 9

10 PUBLICITY IYUED I)ESCHIPTION 11 WIN A

\\

1 NA 1

8 9

10 NAME OF PREPARER 80 METHOD OF DISCOVERY 45 4

INA DISCOVERY DESCRIPTION MONTHLY SURVEILLANCE I

80 I

LOCATION OF FIELEASE 0 45 80 80 80 80 07030 3L4 NRC USE lJ ONY Ni(; I OIIMM l 1///

LIC:NSLlI LVI N I 111 1'01 CONI 110 III.OCK:

I (IEl.EASE PIttNI 011 IYIL ALL ftEOUIRIED INFOIIMATIONI)

MIN IMIN IP 1 10 101-10110 0 10 1-10 10 (1)1 4 11111111 1I401 9

LICENSEE CODE 14 15 LICENSE NUMIJLI1 75 26 LICENSE TYPE JO 57 CAT b8 REPOI L L@ 1015101010 2 16 13 D0)10 1512 197 1

1Q9110 16121 817 19 1 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES IDURING SURVEILLANCE TEST, MINIMUM FLOW IN "B" TRAIN SBGTS COULD NOT BE ATTAINED AS REQUIRED BY T.S. 3.7.B.1.

"A" TRAIN WAS SHOWN TO BE OPERATIONAL.

ALSO ADEQUATE FLOW WOULD HAVE BEEN OBTAINED THROUGH BOTH SBGTS UNDER AUTOMATIC INITIATION CONDITIONS.

NO EFFECT ON THE PUBLIC HEALTH AND SAFETY.

TWO PREVIOUS SIMILAR EVENTS. REPORTABLE L8CCURRENCE M-RO-77-13 AND M-RO-78-03.

0 80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SURCODE COMPONENT CODE SUBCODE SUBCODE IS IC

.J LJ. IB V A I L IV 0 P l DJ 9

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION O LER/RO EVENTYEAR REPORT NO.

CODE TYPE NO.

7 REPORT 1719 I

- j 10 11 11 L J 10 13 L

L--

L0i N 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPFID-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORM bUUl.

SUPPLIER MANUFACTURER A

Z W LJ 10 10 lo1 1 L J

LYJ Il@ IM 14 13 10 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS IDILUTION FLOW FROM COMPRESSED STORAGE NOT ISOLATED BY BV-5 WHEN SBGTS "B" TRAIN ISTARTED.

FOREIGN MATERIAL IN BV-5 POSITIONER (MODEL 74G, DOUBLE ACTING).

REPLACED POSITIONER AND INSTALLED FILTER IN CYLINDER SUPPLY/RETURN LINE.

ALSO INSTALLED FILTER IN COMMON INSTRUMENT AIR SUPPLY LINE TO BOTH BV-4 AND BV-5.

10 1

1 12 Ii 131 G8 69 80 ;

0 lONE:

612/295-5151 a

.o PH It. Ih NiltIA I All i11(1itl AtInIIV IcIMitiiUN D6 6