ML20086D642

Telecopy Ro:On 770709,determined That Recombiner Sys a Offgas Flow Control Valve PCV 7489A Could Be Opened W/ Controlling Solenoid Valve Deenergized.Valve Held from Svc Pending Investigation

ML20086D642
Person / Time
Site:	Monticello, 05000000
Issue date:	07/11/1977
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 8312020429
Download: ML20086D642 (2)

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NORTHERN STATES POWER COMPANY bbnticello Nuclear Generating Plant Mmticello, 7M 55362 l

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July 11, 1977

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I htr. J. G. Keppler, Director Region III Office of Inspection and Enforcement United States Nuclear Regulatory Comission 799 Roosevelt Road Glen Ellyn, IL 60137 i

Dear Mr. Keppler:

hDhTICELID NUCLEAR GENERATING PLAhT Docket No. 50-263 License No. DPR-22 During reactor operation at 781 power on July 9,1977 it was determined that

'A' recombiner system off gas flow control valve OCV 7489A) could be opened even though the controlling solenoid valve was de-energized.

Ghis 1

valve aceives a trip signal 30 minutes after the air ejector radiation monitor trips). 'Iho valve has been held fmm service pending investiga-tion.

Yours very truly, f/)h A. A. E L. R. Eliason Plant Manager LRE/sdd

i cc:

Director, Office of Management Inforation G Pmgram Control G. Charnoff i

Minnesota Pollution Control Agency i

Attn:

J. W. Fennan File Copy sent by telecopier to Keppler.

j 8312O20429 780426 PDR ADOCK 05000263 i

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NORTHERN STATES POWER COMPANv Mmticello Nuclear Generating Plant lbnticello, FM 55362

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July 11,1977 1

n Mr. J. G. Keppler, Director ion III O ice of Inspection and Enforcement l

United States Nuclear Regulatory Commission 799 Roosevelt Road i

l Glen Ellyn, IL 60137 l'

i

Dear Mr. Keppler:

PMTICEUD NUCLE 4R GENERATING PLANT Docket No 50-263 License No. DPR-22 e

During reactor operation at 78% powr on July 9,1977 it was detenmined that W recombiner system off gas flow control valve (PCV 7489A) could be (This opened even though the controlling solenoid valve was de-energized.

j valve receives a trip signal 30 minutes after the air ejector radiation monitor trips). The valve has been held,from service pending investiga-j t,

tion.

i l

Yours very truly, h

N,4. N.=%

l L. R..Eliason Plant Manager LRE/sdd cc:

Director, Office of Management Information 4 j

Program Control G. Charnoff Minnesota Pollution Control Agency Atta:

~J. W. Pennan Pile I

Copy sent by telecopier to Keppler.

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