ML20086D557

Telecopy Ro:On 770929,local Leak Rate Testing of Core Spray Inboard Isolation Check Valve AO-14-13A Indicated That Leakage Exceeded Tech Spec Acceptance Criteria.Cause Under Investigation

ML20086D557
Person / Time
Site:	Monticello, 05000000
Issue date:	09/29/1977
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 8312020385
Download: ML20086D557 (1)

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N*O,N.T. W E N:N' 5.T.A.T.E S P ' O W' E R - C O-fW P ~ A N ' Y Monticello Nuclear Generntin Plant

!Mnticello,. Minnesota 5 362 SD 'E &

l i

Septcobcr 29, 1977 l

[

Mr. J. G. Keppler, Director r

Region III Office of Inspection and Enforceraent United. States Nuclear Regulatory Co.waission 799 Roosevelt Road Glen Ellyn,. Illinois 60137-s

Dear Mr. Koppler:

!ERICELi& NUCIJAR GENERATING PLAhT Docket No. 50-263 Licenso No. DPR-22 On September 29, 1977, local leak rate testing of the Core Spray Inboani Isolation Check Valve, M-11-13A, indicated that the lenknRe exceeded the Tec.hnical Specification acceptance criteria for individual isolation valves.

' Die measured Icakage was apparimately 459.75 SCFH.

• lhe cause of this Mr. Ned Choulos, Region 111 high leakage rate is being investigated..

1.E. Inspector was on site at the time of this occurrence and-was info,rmed of the valve leakage pmbica.

Yours very truly,

)'

c1 s

(

9 4

lir. son Plant. Manager LRE/kik cc:

Dimetor, Office of Management Infomation G Progree Control G. Chamoff Minnesota Pollution Control Agency Attn J. h'. Feman File Copy sent by telecopict to Xcppler.

B312020385 780426 PDR ADOCK 05000263 S

PDR