ML20086D788

Telecopy Ro:On 760909,discovered That Torus Water Vol Several Hundred Cubic Ft Below 68,000 Cubic Ft Min Required by Tech Specs.Caused by Failure to Correct for Vol Vs Level Correlation

ML20086D788
Person / Time
Site:	Monticello, 05000000
Issue date:	09/10/1976
From:	Eliason L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19289B550	List: 05000000/LER-1977-012, :on 770620,during Investigation of Cycle 5 Max Critical Power Ratio Limits,Ge Found That Pump Trip Delay Time Assumed in Original Cycle 5 Transient Analysis Not Appropriate.Amend Request Will Be Submitted 05000000/LER-1977-020-03, /03L:on 770404,RCS Leakage Determined to Be Greater than 10 Gpm.Caused by Packing Leakage Past Stems on RTD Bypass Throttle Valves 13RC20 & 14RC20.Valves Placed on Backseat & Stem Leakage Decreased 05000000/LER-1977-038-03, /03L:on 770519,RCS Leakage Determined to Be Greater than 10 Gpm from Stem Leakoff on Manual Isolation Valves 1PS24 & 1PS28 for Pressurizer Spray Valves.Caused by Packing Leakage.Valves Will Be Repacked at Next Outage ML20086D481 ML20086D514 ML20086D520 ML20086D537 ML20086D550 ML20086D554 ML20086D557 ML20086D561 ML20086D567 ML20086D606 ML20086D642 ML20086D691 ML20086D703 ML20086D760 ML20086D788 ML20086D818 ML20086D823
References
NUDOCS 8312050119
Download: ML20086D788 (1)

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fy NOS NOMTHERN 5TATES POWER C O M P A-N 'tf' -

Montice]Io luc 3 car Generating Plant Monticello, )W. M062 i

Septeinber 10, 1976 Mr. J. G. Kcppler, Director Region 11]

Offico of Inspection and Enforcement United Staten Ibclear Regulatory Co:maission 795t Roosevelt Road Glen 101yn,1311nois 60137

Dear I&. Keppler:

15)Mr3CEL10143CLP.AR GP)EHKrIlfJ PLAW Boeket No. 50-263 License No. DPR-22 On Septctaber 9,1976, it was fourut that tonxs water voltme was several.)nm-dred cubic. feet below the 68,000 cubic foot minirams required by TecJmical Specification 3,7.A.1 (e).

'Ibnis tet.cr }cyc1 had been reduced slightly on September 7,.1976, in response to recently expnssed NRC desire that level he reintaitied closer to the low ]imit-to adnimize. structural londs during a IDCA.

The correlation between volume aml indicated Icyc1 which war. used to estab3ish the desired IcVel Igid not been corrected to account for water displaced imm the ' vent dowmomers due.to the dr>vell - torus pressure diff-crential,.

tipon discovery, the wtter voltmc was increased to slightly above the' limit, and a new volume vs level cortclation was issutxl.

Yours ven truly, 9}

n 0 f I k. b

( c a.k.

L.R. Elianon Plant Manager LRE/sdd cc:

Director, Office of ihnugement Information in Program Control (2 copies)'

G Charnoff 141nnesota Pollution Control Agency ~

Attn:

JifPenwut

~

' Pile-Copy sent by-telecopier to Keppler.

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