ML20058K599

Ler:On 770321,discovered Air Ejector Radiation Monitors Inoperable During Startup Caused by Sample Sys Isolation

ML20058K599
Person / Time
Site:	Monticello
Issue date:	04/04/1977
From:	Mayer L, Scheinost R NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-LER-770404, NUDOCS 9102120592
Download: ML20058K599 (2)

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                                                            !O l5 l0 l-l 0 l 2 l 6l 3l 61                                68      69                                             74     75 EVENT DESCRIPTION DURING PLANT STARTUP, THE AIR-EJECTOR SAMPLE SYSTEM WAS FCUND TO BE ISOLATED, CAUSINGj Ql 7 89 80 OFF-GAS WAS BEING PROCESSED TOl Q [ BOTH AIR-EJECTOR RADIATION MONITORS TO BE INOPERABLE.                                                                                                                    80 7 83 l

l @l THE HOLDUP SYSTEM. NOT A REPETITIVE OCCURRENCE. SAMPLE SYSTEM 80 SUPPLY 7 89 g hl OPENED. (M-RO-77-06) 83 7 89 J 5L 7 89 m rl) 6wAs J50 vota'ow CYo'E coIE coupoNENT cooE c i M l C l LA,j lIlNISlTl RI1117 lNl lGl0l8l0l lY l 43 44 47 48 7 89 10 11 12 CAUSE DESCRIPTION WOPI l O l PLANT OFERATORS VERE UNAWARE THAT SAMPLE SYSTEM SUPPLY VALVE WAS CLOSED. 80 7 89 ALSO. SA**LE FLOW ALAEM TO l h l CON'" DOL PROFTCS AD START _7 PROrrnt wr5 TO BE RrVTSTD. 80 7 89 l 3l FE INVrSTICATTD. 0%; , 0 E. er-to 1.ruS "#E!a# oscovE~ mS -c~ l

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s O April 4, 1977 k [ T, d 6.. , Mr J G Keppler, Director, Region III [y-Office of Inspection & Enforcement N-1{-{('h U S Nuclear Regulatory Co:rdssion 790 Roosevelt Road Glen Ellyn, IL 60137 i

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PIANT Docket No. 263 License No. DPR-22 Air-Eiector Radiation Monitors Found Inoperable The Licensee Event Report for this occurrence is reproduced on the back j of this letter. Enclosed are 3 copies. Yours very truly,

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L 0 Mayer, PE Manager of Nuclear Support Services LOM/MHV/ak l cc

Director, IE, USNRC (40)

, Director, MIPC,, USNRC (3) l G Charnoff MPCA Attn: J W Perman l l l i 1

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