ML20085A506

Advises That Periodic Insps for Corrosion Products of Pressurizer Electromatic Relief Valve PSV-RC 2,in Areas of Solenoid Bracket,Link Pins & Lever & Manual/Visual Checks for Freedom of Motion,Necessary to Prevent Malfunction

ML20085A506
Person / Time
Site:	Three Mile Island
Issue date:	07/31/1975
From:	Randy Baker BABCOCK & WILCOX CO.
To:	Jonathan Evans TOLEDO EDISON CO.
References
TASK-03, TASK-05, TASK-06, TASK-07, TASK-3, TASK-5, TASK-6, TASK-7, TASK-GB GPU-0490, GPU-490, NUDOCS 8307060540
Download: ML20085A506 (1)

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O BabcochWilcox P.O. Pea 1260.Lynchtiurc Va. 24505 T- h. ;" /JW 5111 l

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Mr. J. Q. Evans. Station Superintendent .'

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a Subject Solenoid Pilot operated Pre.ssurit'er .

P.elief Yalve - PSV-RC

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Dear Jack:

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, One of our custcoers recently experienced a pressuriser electronatic relie

.a valve malfanction while at low power in preparation for plant N 2 actuated theshutdown.

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pressure transient in the Reactor Cools:t Eyste:The valve failed to close after pnssure "'

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' ,1 electronatic relief valve. Failun to procytly .

. duced causing the Quench Tank rupture disc to :.:pture.

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close the electromatic relief isolation ralve resulted in violations of sew.'*'.<.:-,'

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eral plant limits,1. e. fuel compression curve, cooldown . L .;.rates..:j..* . ' ': 'b:J'* ; 4'.* q- .

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, An inspection of the power relief valve'arter shut . a. ..

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@;.2. valve fren resenting. Restraint.of the lever was caused by correrion of the ', ..

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Style EPV-53 solecoid pilot operated relief velve. (D&W Inatruction--

m .t n. ., . ..m.. The Pressuriter Electromatic Relief Yalve at Davis-Besse Unit I is a Crosby ' ,

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Pericaic inspections for the presence of corrosion stvducts. M -  :

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'i ' particularly in the area of the solenoid .g bracket, soleno '

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motion should be made during plant shutdowns., ..g,g;s - Q,. .y'!"

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. . 3 In the event that the Pressuriser Electromatic f isolation valve Relief Valve fail.s vill prevent en ; ,.> t'o. Jclose,

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' pronpt closure of the electronatic - . . *- % J . .u . , -qrelie , uncontrolled pH~. , . m .;, .

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,1f you have a::y questions, please . , u s. , co:stact n.n . . *Fred . . Tais% -. .

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