ML20086D481

Advises That Addl Conservatism Being Administratively Added to Tech Specs for Max Critical Power Ratio Limits,In Light of GE

ML20086D481
Person / Time
Site:	Monticello, 05000000
Issue date:	06/20/1977
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 8312020160
Download: ML20086D481 (1)

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..S T A T E S, POWER COMPANY lbdticello' h'uclear Generating Plant Monticello,!N 55362 June 20,1977 Mr. J. G. Keppler, Director Region III ffice of Inspection nnd Enforcement t 'ted States 16 clear Regulatory Comission 799 oosevelt Road Glen yn, IL 60137 Dear Mr. h ler:

!O.\\TICELID hE" LEAR GENERATING PLAhT Docket No. 50-263 License No. DPR-22 On June 20, 1977, a 1 ter was received fmm the General Electric Company informing NSP that the iginal Cycle 5 analysis of the Critical Power Ratio is not sufficiently nservative.

It assummed a t1co pump trip with a 0.1 second delay for pump cctrical torttue to drop from 1000 to 04 follo'.cing a turbine trip. Ad y of 2.0 seconds is nore appropriate.

A conservative estimate is that thi. will msult in increasing the frPR lintit pg.nl for both our 7 x 7 and 8 x 8 fuel h) 0.08.

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This additional conservatism is being a "nistratively added to the Techni-

@$ i' cal Specification lintits.

-t Yours vep t y y

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LRE/sdd Director, Office of Ihnancment Information 6 cc:

Program Control

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G. Charnoff

'n Minnesota Pollution Control Agency Atta:

J. h'. Feman

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Copy sent by telecopier to Keppler.

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