05000336/LER-1981-020-01, /01T-0:on 810616,2 1/2 Inch Fittings Between 4-inch Pressurizer Safety Valve Inlet Lines & Safety Valves Found within Allowable Limits.Reduced Inlet Pipe Reduces Valve Discharge Capacity.No Substantial Hazard Constituted

/01T-0:on 810616,2 1/2 Inch Fittings Between 4-inch Pressurizer Safety Valve Inlet Lines & Safety Valves Found within Allowable Limits.Reduced Inlet Pipe Reduces Valve Discharge Capacity.No Substantial Hazard Constituted

ML20009A645
Person / Time
Site:	Millstone
Issue date:	06/30/1981
From:	Becker J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009A644	List: 05000336/LER-1981-020, Forwards LER 81-020/01T-0 05000336/LER-1981-020-01, /01T-0:on 810616,2 1/2 Inch Fittings Between 4-inch Pressurizer Safety Valve Inlet Lines & Safety Valves Found within Allowable Limits.Reduced Inlet Pipe Reduces Valve Discharge Capacity.No Substantial Hazard Constituted
References
LER-81-020-01T, LER-81-20-1T, NUDOCS 8107130426
Download: ML20009A645 (1)

LER-1981-020, /01T-0:on 810616,2 1/2 Inch Fittings Between 4-inch Pressurizer Safety Valve Inlet Lines & Safety Valves Found within Allowable Limits.Reduced Inlet Pipe Reduces Valve Discharge Capacity.No Substantial Hazard Constituted

Event date:
Report date:
3361981020R01 - NRC Website

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J SO St DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT oESCRIPTloN AND PRoBA0LE CONSEQUENCES Oio M i Millstone Unit 2 was designed and buiTt with 2-1/2 inch fittings between the 4 inch l

The valves,were rated l

pqT) l pressurizer safety valve inlet lines and the safety valves.

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g l with respect to an inlet pipe ID of 2-1/2 inch.

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gOg3j discharge capacity; which could be less than the values assumed in the sai sty g

10 is i I l analysis that involve actuation of the pressurizer safety valves.

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liIii i calculated at less than 1 percent.

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during loss of load with an assumed 10 percent reduction in safety valve capacity l

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