ML20086D554

Telecopy Ro:On 771004,local Leak Rate Testing of HPCI Sys Discharge Isolation Check Valve HPCI-9 Indicated That Leakage Exceeded Tech Spec Acceptance Criteria.Cause Under Investigation

ML20086D554
Person / Time
Site:	Monticello, 05000000
Issue date:	10/05/1977
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 8312020380
Download: ML20086D554 (1)

Text

_

l') (v~')

Qg r~

p v

NBRm NORTHERN STATES POWER COMPANY

!UNr10iLLO, Miteit.WTA SS.% Z

~h ]

KO'vTTCTHD NUCLEAR GENERATING PLANT October 5, 1977 Mr. J. G. Keppler, Director Region III Office of Inspection and Enforcanent United States Nuclear Regulatory Comnission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

1D!CICFED NOCLFAR GENERATING PIM Docket No. 50-263 License No. DPR-22 On October 4,1977, local Icah rate testing of the liigh Pressure Coolant Injection System discharge isolation check valve HPCI-9, indicated that the leakage exceeded the Technical Specification acce,ptance criteria for individual isolation valves.

The Incasured Icahage was approximately 67.0 SCF)l.

The cause of the high Icakage rate is being investigated.

Yours very tmly,

/

t f-L. R. Eliason Plant Manager LRE/kik cc:

Director, Office of Management Infonnation G Program Control G Charnoff Minnesota Pollution Control Agency Attn: J W Feman File Copy sent by telecopier to Keppler.

8312020300 780426 PDR ADOCK 05000263 S

PDs b

h' Nb.

[0 f LL.