ML20067D676

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Provides Conceptual Design & Installation Schedule for Hot Leg Level Monitoring Sys,Per NUREG-0737,Item II.F.2.3. Present Schedule Calls for Installation of Sys During Refueling Outage of Sufficient Duration 1-yr After Approval
ML20067D676
Person / Time
Site: Davis Besse 
Issue date: 12/10/1982
From: Crouse R
TOLEDO EDISON CO.
To: Stolz J
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.2, TASK-TM 856, NUDOCS 8212210081
Download: ML20067D676 (5)
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ee HREDO

%si EDISON Rowo P. Cnouse Docket No. 50-346 v.n,u 4 s,.,

License No. NPF-3 Serial No. 856 December 10, 1982 Director of Nuclear Reactor Regulation Attention:

Mr. John F. Stolz, Chief Operating Reactors Branch #4 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Stolz:

As committed to in our letter to you (Serial No. 760) dated November 24, 1981, this letter serves to provide the conceptual design and the installa-tion schedule for the Hot Leg Level Monitoring System (HLLMS) for the Davis-Besse Nuclear Power Station Unit ' ner NUREG-0737 item II.F.2.3.

The attachment to this letter provides the conceptual design (consisting of the design criteria and functional description) for this system. Our present schedule calls for installation of this system during a refueling outage of stfficient duration one year following your approval of the attached conceptual design.

Very truly yours, fk w

RPC:LCS:SCJ Attachment pk d/4 cc: DB-1 Resident NRC Inspector j[)([-)

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8212210001 821210 PDR ADOCK 05000346 P

PDR THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652

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l Docket No. 50-346 License No. NPF-3 Serial No. 856 December 10, 1982 ATTACEMENT TO. TOLEDO EDISON LETTER ON HOT LEG LEVEL MONITORING SYSTEM CONCEPTUAL DESIGN To comply with NUREG-0737 Item II.F.2.3, Toledo Edison has completed the conceptual design of a hot leg 1cvel monitoring system (HhtMS). This system uses a differential pressure measurement across each hot leg. A detailed schematic of the syst;m is enclosed herewith.

Design Criteria As shown in the schematic, the HLLMS has one differential pressure transmitter per reactor coolant hot leg. The transmitters are spatially separated and the sensing lines for each hot leg pipe are routed within the respective steam generator compartment and, as such, physically separated. The lower tap for each transmitter is common.

The HLLMS will be designed to meet the separation requirements for Class IE equipment for the electrical portion up to and including the isolation device interfacing with the station computer. Power for the IE portion will be provided for each channel of this system via the Class IE essential instrument power sources. The HLLMS will be designed to ASME Section III Class 2 requirements for the sensing line portion up to and including the last shut off valve of the instrument.

The IE portion of the HLLMS will be designed to meet the separation requirements of lEEE-279-1971. The Class IE components of the system will be designed to meet the environmental qualification requirements of IEEE-323-1974. Seismic qualifications requirements of IEEE-344-1975 will also apply to the IE portions of this system.

Functional Description The water level in each hot leg is determined by measuring the differential pressure between the top and bottom of the hot Icg and compensating for the density of water in the hot Icg and reference leg.

The density is calculated by the station computer utilizing the RCS pressure, RCS temperature and the reference leg temperature.

Rosemeunt 1153 HD6 transmitters (pressure range of 0-100 psid with 4-20 mA output) will be utilized to ceasure the differential pressure between the upper tap reference leg (at Steam Generntor Inlet) and the lower tap (Hot Leg at Reactor Outlet). The reference leg impulse line will be connected

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to an existing 1.0 inch RCS high point vent line (1" CCA-20; 1" CCA-21).

The lower tap impulse line (variable leg) will be connected to an existing 3/4 inch sensing line. This lower tap will be common to both hot leg level monitoring transmitters.

Temperature compensation will be provided to allow for changes in the instrument reference leg fluid density resulting from variations in containment ambient temperature. This will be accomplished by utilizing 4

a thermister attached to each reference leg.

The thermister wire tracks the entire vertical length of the instrument j

reference leg. This sensor will provide an average temperature signal which is converted to 4-20 mA within the thermister control panel located outside containment. Subsequently, the signal will be transmitted 4

directly to the multiplexer cabinet for A/D conversion prior to transmitting it to the plant computer. A class IE power source (120 VAC) for the thermister will be provided. This configuration will exist for each channel.

The HLLNS will monitor hot leg water level during natural circulation or during periods when natural circulation is interrupted.

No output display will be available when one or more reactor coolant pumps are running.

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