ML20127L320
| ML20127L320 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 07/23/1975 |
| From: | Hill W, Mayer L NORTHERN STATES POWER CO. |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| References | |
| LER-LER-750723, NUDOCS 9211230493 | |
| Download: ML20127L320 (2) | |
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NORTHERN 5TATKS POWER COMPANY MIN N E A POLIS. MIN N E SOTA SS40%
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July 23, 1975 Ifr A Giambusso, Director Division of Reactor Licensing
'.. 7 U S Nuclear Regulatory Commission Washington, DC 20555
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Dear lir Giambusso:
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lONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Inoperable Reactor Water Level Sensor The Licensee Event Report for this occurrence is reproduced on the back of this letter.
Yours very truly,
, ho L 0 }!ayer, PE lbnager of Nuclear Support Services LOM/MIV/ak y.
cc: J G Keppler G Charnoff i.'
1TCA Attn: J W Ferman h
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-over-9211230493 750723 PDR ADOCK 0507)O263 -
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LICENSEE EVENT REPORT CONTROL BLOCK-[ l l l l l
l (PLEA 8E PRINT ALL REQUIRED INFORMATION) g 1
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CAsecour oo:sti Nuvot A EvtN1 DA f t HEpo4T Catt a CON 1 l P l 0 l
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[ 0l7 l1 l3 l7l Sl 10 l7l 21 31 715l 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCAiPTION
@l During normal operation a small leak developed in a Reactor Pressure Gauge. The l
7 89 80 El l 1eak Icucred the reference leg level for the_ scram and ECCS initiating Yarway l
7 89 80 El l Level instruments connected to the same process tap causing incorrect level l
7 89 80 DE l indication. Redundant Yarways were operable. No previous similar occurrences.
l 7 89 80 gl Pressure Gauge isolated.
(A0 50-263/75-12) l 89
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? 89 10 11 12 17 43 44 47 48 CAUSE DESCAIPTION DE I A leak developed in the sourdon Tube or neise Model cms 7646 0-1500 psig I
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@l pressure Gauge. Cause of leak unknown. Gauge to be replaced.
l 7 89 80 DE I I
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vtTH00 OF Status
% PCWEA 0' MEA STafv5 C'500vf AY OtSCOVERY DE SC AtP TtON J
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l Received Level Alarms l
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10 12 13 44 45 46 80
'[cT v[v CONTENT AELE ASEC OF AELE ASE AMOUNT 05 Ac tivit y LOC AT!ON OF AEtt ASE 3
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7 8 9
10 11 44 45 80 PERSONNEL EXPOSUAES NuV0ER TYFE DE SC A)P fiON Q l 0l 0l Q ]
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7 89 11 12 13 80 PEASONNEL INJUAiES NuvsIA DE SC A4p T,0N E l 0 l 0l OI l NA l-7 89 11 12 Bo OFFSITE CONSEQUENCES Ql NA l
7 89 80 LOSS OR OAMAGE TO FACILITY Tvpf OtSC4PfON B] W l NA l
7 89 10 80 PUBUCITY
@l NA l
7 89 80 ADDITION AL FACTORS
@l Occurrence also affected system IB l
7 89 80 bI l
7 89 80 NAME.
W J Hi,11 ps&c 612-295-5151
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