ML20071J609

RO 50-317/83-19:on 830426,while Raising RCS Pressure to 400 Psig,Porv ERV-404 Inadvertently Opened.Valve Immediately Isolated by Shutting Upstream Valve.Complete Description of Event & Corrective Actions Will Be Submitted

ML20071J609
Person / Time
Site:	Calvert Cliffs
Issue date:	04/27/1983
From:	Russell L BALTIMORE GAS & ELECTRIC CO.
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-50-317-83-19, NUDOCS 8305270072
Download: ML20071J609 (2)

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ggi m m, + : m. ma ny B ALTIMORE G AS AND ELECTRIC COMP AN PO. 80 x 14 7 s sALTIMORE. MARYLAND 21203 MUCLEAR Powte OEPARTMENT CALVERT CLIPP%huCLEAR POWER PLANT L*J 52Y, MARYL AND 20G 57 April 27, 1983 Docket No. 50-317 Mr. James M. Allan License No. DPR 53 Acting Regional Administrator U. S. Nuclear Regulatory Commission Region 1 631 Park Avenue rina of Prussia, PA 19406

SUBJECT:

LER 83-19 (U-1)

Dear Mr. Allan.

is to confirm our verbal notification of your Mr. Ralph This report Architzel of an inadvertent opening of a Power Operated Relief Valve (PORV).

At 2014 on April 26, 1983, while in Mode 5 at about 198'F in the Reactor Coolant System (RCS), primary system pressure was being With RCS pressure indicating approximately raised to about 400 psig.

400 psig on the plant computer and approximately 430 psig on was immediately isolated by shutting PIC-103-1, ERV-404 opened.

It its upstream valve (T.S. 3.4.9.3).

While in T.S. action statement 3.4.9.3.a (a), RCS temperature since shutdown cooling increased to greater than 2OO"F (Mode 4),

flow had been terminated and one RCP was running per T.S. 3.4.1.3.

While troubleshooting the problem with the PORV, at 2150, a stort caused a loss of control power to ERV-402, rendering the second PORV Control power was restored to ERV-402 (T.S. 3.4.9.3).

inoperableBy 2230, both PORVs were in service in MPT enable.

at 2207.

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8305270072 830427 PDR ADOCK 05000317 he 24 S

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Mr. James M. Allan April 27, 1983

---J-A completa description of this event and a discussion of correctiva and preventive actions will be contained in.the follow-up report.

M Very truly yours.

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L. B. Russell 5

Plant Superintendant 1-LBR RLW bab

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cc:

J. A. Tiernan R. M. Douglass Y

Director. Office of Mana8a-nt R. E. Architzel

-A Information and Program Control L. B. Russell h

R. L. Wenderlich J. M. Moreirs

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