ML19257D682

LER 79-042/03L-0:on 791228,during Lineup of Safety Injection Sys to Recirculate in Preparation for Increasing Level in Safety Injection Tank 1,level in Tank Decreased Below Tech Specs.Caused by Leakage in Tank Fill or Drain Valve

ML19257D682
Person / Time
Site:	Millstone
Issue date:	01/25/1980
From:	Stratman R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257D681	List: ML19257D680 ML19257D682
References
LER-79-042-03L, LER-79-42-3L, NUDOCS 8002050406
Download: ML19257D682 (1)

Text

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T 60 61 DOCKE T NUMBUt th 63 EVENT DATE 74 7S HU Ott T DALE b0 EVENT DESCHtPTION AND PROD ADLE CONSEQUENCES h i 2 l During steady state power operation, the safety iniection sv.ste, was lined un to I

,;3; } recirculate in preparation for increasing the level in number 1 safety injection i I, 4 l tank. During this line up the level in nunber 1 safety injection tank decreased to I

, , ; 54.9 percent which is less than the 55 percent allowed by Section 3.5.1.b of the t

, lc ; l Technical Specifications, The plant was operated in accordance with the Action I

j Statements of Technical Specification 3.5.1 and the tank level increased within one t

> Is l I hour. Similar Event 77-32, dated 7/21/77. l 8 9 80 SYSTEM CAUSE CAUSE COMP.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Tj O] [ The cause of the level decrease is leakage through either the tank fill valve, drain 1 3 , ; [ valve or both. The fill valve, 2SI-611, is a Fisher type 667-ES,1 inch diaphragm I

, , i control valve rated at 600 PSI. The drain valve, 2SI-618, is a Fisher type 667-D80, t

, y .,, l l inch diaphragm control valve rated at 1500 PSI. These valves are nomally isolated (

, , , and will be inspected and repaired during the next shutdown of sufficient duration. l 8 9 60 STA  % POWER OTHER STATUS 1500 FY

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