ML19210B423

Refers to NRC 771111 Ltr to Util & Util 780113 (Gql 0049) Ltr to Nrc.Provides Addl Info Re RCS Overpressurization Protection

ML19210B423
Person / Time
Site:	Three Mile Island
Issue date:	03/13/1978
From:	Herbein J METROPOLITAN EDISON CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
GQL-0426, GQL-426, NUDOCS 7911080638
Download: ML19210B423 (3)

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POST OFFICE box 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 929C601 March 13,1978 GQL Oh 26 Director of Nuclear Reactor Regulation Attn: R. W. Reid, Chief Operating Reactors Branch No. h U. S. Nuclear Regulatory Cc==ission Washingten , D. C. 20555 _

Dear Sir:

Three Mile Island Nuclear Station Unit 1 (TMI-1) . ;.1. 7 ,~~

N-Operating License No. DPR-5C Dceket No. 50-289 RCS Overpressurizatien Re: 1. NRC letter of November 11, 1977

2. Metropolitan Edison Company letter of January 13,1978 (GQL 00h9)

As a result of several telephone conferences with members of your staff concerning the abcse referenced letters, Met-Ed agreed to address the ad-ditional concerns identified. These concerns and Met-Ed's respense are as follows:

1. Met-Ed to submit proposed Technical Specificatiens to include the conditions for removal of the Electrc=atic Relief Valve from service for testing and maintenance, system enabling temperatures and Elec-trc=atic Relief Valve setpoints.

Response: Technical Specification Change Request No. Th has been prepared and vill be submitted March 13, 1978.

2. Met Ed to reevaluate the Decay Heat Receval System for RCS overpressurization protection.

Response: Assuming the DER system could be used tc provide RCS overpressurization protection, the following engineering / construction would be necessary:

a. Design the DHR system appurtenance, together with the relief valve (s), and discharge line to the su=p, in accordance with the codes, and within the very confined space envelope available.

b. Procure tbe necessary hardware, including relief valve (s),

piping, hangars and snubbers, and either reducing tees or veld-o-lets to break into the existing pipe. 1584 009

c. Provide labor for installation. l

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1R. W. Raid, Chief Aarch GQL 13 '6 1978 012 It is estimated that the above engineering /constructien, including the initial evaluation to determine if the DER system could be used to provide RCS over-pressurization protection, vould cost $160,000.

3 Met-Ed to review HPI Surveillance / Test procedures to verify that no HPI testing is performed while within the overpressurization vindow.

Respense: All TMI-l HPI Surveillance / Test procedures have been reviewed.

A Procedure Change Request has been initiated to Surveillance Procedure 1303-11.8, and vill be effective prior to the forthecning refueling out-age. Precaution steps have been added to Surveillance Procedures 1303-5.2 and 1300-3H. No other procedures required changes.

h. Met-Ed to evaluate the pcssibility of installing limit switches en RC-V2 to =cnitor actual valve stem position rather than the existing design using the limitorque switches to indicate valve stetus.

Respense: Preliminary evaluation of the valve indicates that since the valve strcke is so short (only 2.5 inches) and valve stem accessibility is limited, it is not practicable to install valve stem limit switches.-

Since the limitorque switches are gear-driven, it is unlikely that the valve positien stops vill drift. Based on the above, Met-Ed does not

. intend to pursue this matter further.

5 Met-Ed to evaluate alarming the MU-vl6A/B/C/D valves as an alternative to key locking the motor operator breakers and valve handvheels.

Response: Preliminary evaluation has indicated that this option is feasible and perhaps more desirable from an operations standpoint than -

locking the HPI valve breakers and handwheels. Upon NRC notification that alarming the HPI valves is an acceptable method of RCS cverpressuri-atien protection, Met-Ed vill proceed with alarming t4e HPI velves.

6. Met-Ed to commit to installing the enabling alarm which scnitors the ever-pressurization protection system enabling switch and to installing the alarm to scnitor the status of the pressurizer relief block valve, RC-V2, in accordance with our submittal of January 13, 1978, as expeditiously as possible.

Respense: The engineering and design for the above scdifications is presently underway. Met-Ed will proceed v.'.th this project as expediticusly as possible. Installation vill be performed during any cutage that vill permit installation, but in no case, later than the 1979 refueling cutage.

In s"--a"y, Met-Ed's proposed RCS cverpressurization protecticn consists of the proposed Technical Specifications in conjunction with the mcdifications described above. Shculd you have any further questions regarding our proposal, do not hesitate to call.

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Y J . G./ Herbein Vice President-Generation 1584 010 JGE:RJS:cjg