05000263/LER-1980-023-03, /03L-0:on 800601,air Ejector Offgas Radiation Monitors Dropped to About 20% Normal for About 40 Minutes. Caused by Mechanical Vacuum Pump Offgas Sample Valve Being Incorrectly Opened.Valve Now Wired Shut

/03L-0:on 800601,air Ejector Offgas Radiation Monitors Dropped to About 20% Normal for About 40 Minutes. Caused by Mechanical Vacuum Pump Offgas Sample Valve Being Incorrectly Opened.Valve Now Wired Shut

ML112900760
Person / Time
Site:	Monticello
Issue date:	07/01/1980
From:	Jacobson R Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112900761	List: 05000263/LER-1980-023, Forwards LER 80-023/03L-0 05000263/LER-1980-023-03, /03L-0:on 800601,air Ejector Offgas Radiation Monitors Dropped to About 20% Normal for About 40 Minutes. Caused by Mechanical Vacuum Pump Offgas Sample Valve Being Incorrectly Opened.Valve Now Wired Shut
References
LER-80-023-03L, LER-80-23-3L, NUDOCS 8007100195
Download: ML112900760 (3)

LER-1980-023, /03L-0:on 800601,air Ejector Offgas Radiation Monitors Dropped to About 20% Normal for About 40 Minutes. Caused by Mechanical Vacuum Pump Offgas Sample Valve Being Incorrectly Opened.Valve Now Wired Shut

Event date:
Report date:
2631980023R03 - NRC Website

text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8007100195 0OC.DATE: 80/07/01 NOTARIZED: NO FACIL:50-263 Monticello Nuclear Generating Plant, Northern States AUTHNAME AUTHOR AFFILIATION JACOBSONR.D.

Northern States Power Co.

RECIPNAME RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director DOCKET #

05000263 SUBJECT: LER 80*023/03L-0:on 800601,air ejector off gas radiation monitors dropped to about 20% normal for about 40 minutes, Caused by mechanical vacuum pump off gas sample valve being incorrectly openedValve now wired shut, DISTRIBUTION CODE: A0028 COPIES RECEIVED:LTR j ENCL J, SIZE:

TITLE: Incident Reports NOTES :

RECIPIENT ID CODE/NAME ACTION:

BC/f0P/L/TO,7 05 COPIES LTTR ENCL 1

1 RECIPIENT ID CODE/NAME PM K4FtRA,7. 06 COPIES LTTR ENCL 2

2 A/D COMP&STRUCT A/D ENV TECH A/D LICENSING A/D OP REACTORS A/D RAD PROT A/D TECHNOLOGY AEOD CHEM ENG BR CORE PERF BR DIRHUM FAC SFY DIR,8YS INTEG EMERG PREP EQUIP QUAL BR GEOSCIENCES HYD/GEO BR IKE 09 LIC GUID BR MATL ENG BR MOOREV.

NRC POR 02 OR ASSESS BR PPAS GA BR REACT SYS BR REL & RISK A BR SIT ANAL SR SYS INTERAC BR INTERNAL:

EXTERNAL:

1 1

1 1

1 1

'10 1

1 1

1 1

1 1

1 2

1 1

1 1

1 1

1 1

I 1

1 16 04 1

1 1

1 1

1 1

10 1

1 1

1 1

1 1

1 2

1 1

1 1

1 1

1 1

1 1

16 1

A/D CORE & CS AID GEN PROJ A/D MATL & QUAL AID PLANT SYS A/D SFTY ASSESS ACC EVAL BR AUX SYS BR CONT SYS BR DIRENGINEERING DIRSFTY TECH EFF TR SYS BR ENV ENG BR GEN ISSUES BR HUM FACT ENG BR I&C SYS BR JORDANE,/IE LIC QUAL BR MECH ENG BR MPA 11 OP EX EVAL BR POWER SYS BR PROC/TST REV BR G LE VAL/

STRUCT ENG BR TERA:DOUG MAY LPDR 03 1

1 JUL 11 Ig TOTAL NUMBER OF COPIES REQUIRED: LTTR ACRS NSIC 89 ENCL 89

0 9

NORTHERN STATES POWER COMPANY MINNEAPOLIS, MINNESOTA 55401 July 1, 1980 Mr J G Keppler Office of Inspection &

U S Nuclear Regulatory 799 Roosevelt Road Glen Ellyn, IL 60137 Enforcement Commission

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Low Reading on Air Ejector Process Radiation Monitors 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. in that it represents operation in a degraded mode for a short period of time as allowed by the Limiting Conditions for Operation.

Yours very truly, L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/jh cc: *4.rector, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn:

J W Ferman

- over-10 80 07WO190

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7.77)

LICENSEE EVENT REPORT CONTROL BLOCK:

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

LIII

.K I IN 1P I

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1) 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T REPORT0 Ir\\III I@6 RR L15I 10 lo10 jZ 12 6_

2 0 16 10 11 18 10 l l0 lJ 7 0

WI SOURCE L LDI 1 08 LLL7j?.Qjj~III IJIIC~IIIj 1

8 j o

8 60 61

• DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES During normal operation, the air ejector off gas radiation monitors dropped to about 20% of normal for about 40 minutes.

Closure of the off gas sample box in Fo-I1~ Ilet valve returned the system to normal. This constituted operation of the system in a degraded mode (T.S.6.7.B.2.b). One previous similar occurrence (M-RO-77-14).

No effect on public health or safety.

7 8

9 80 SYSTEM

CAUSE

CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

_1 IM IO(

[Li~ Wi L( VIA1 LIVIEIXO (9

I 1

Wi ZJ@

7 8

9 10 11 12 13 VA 19 2

SEQUENTIAL OCCURRENCE REPORT REVISION LER/RO.rEVENT YEAR REPORT NO.

CODE TYPE NO.

NUMBER L8 10 1

20 3.13 1

21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN HU ATTACHMENT NPRD-4 PRIME COMP COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER L J ~@

i Li 1-1 ll~

0 10i0 LU 4

i10 Lw 11 31v 6 15 n2 36 37 40 442 43 44 4

CAUSE DESCRIPTION AND CORRECTIVE ACTIONSR [A

~rarely used mechanical vacuum pump(MVP) off gas sample valve was incorectly [T~jJ opened. This allowed off gas flow to bypass the off gas monitors. A sample box

=12j inlet valve was closed that isolated the open MVP sample valve which was later

~

closed. The MVP sample valve is now wired shut and will be placed on the off gas 14 system valve checklist.

7 89 8

100 FACILITY

(

METHOD OF STATUS

%POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 32 IY1J i LI Lil NAJ IL erator observation 8 89 10 12 13 44 45 46 s

ACTIVITY.CONTENT RELEASED OP RELEASE NA."MOUNT OP ACTIVITY NALOCATION OF RELEASE 71 6 W W L

L__

89 10 1

44 4

80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION S N

7 8 9 11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTIONO 0W 0 10 1 1 NA 7

8 9 11 12 80 LOSS OF OR DAMAGE TO FACI LITY TYPE

DESCRIPTION

A PUB LI CITY 45NCUEOL ISSUED

DESCRIPTION

NRC AD~

raeyue ehnAl vaumpm(MP fJa sml av wasincorrectly 7

81 9 0

UI 0

.J IL1 oJN NA 7

8 9

10 68 69 80 R. D. Jacobson NAME OF PREPARER.

_MOUNT OF6ACT2VITY151.

L 0701O,~SPHO0 7u 80 90/11 44