ML20086T280
| ML20086T280 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/01/1984 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM 5211-84-2043, NUDOCS 8403060233 | |
| Download: ML20086T280 (6) | |
Text
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I GPU Nuclear Corporation NggIgf Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
March 1, 1984 5211-84-2043 Office of Nuclear Reactor Regulation Attn:
J. F. Stclz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1, (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Containment Water Level Monitoring (NUREG 0737 II.F.1)
In order to assist in the post implementation review of the Containment Water Level Monitor (II.F.1.5), enclosed please find the required design information.
Instrument accuracy and response times sre also provided in response to your request of July 19, 1983.
Sincerely, d
. D. Hukill, Director, TMI-1 IIDil: RAS:mle Enclosure cc:
T. E. Murley J. Van Vliet 8403060233 840301 PDR ADOCK 05000289 P
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GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
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- o CONTAINMENT WATER LEVEL MONITOR Item (1)'
The containment wide-range water level indication channels shall meet the design and qualification criteria as outlined in Appendix
- A.
The narrow-range channel shall meet the requirements of Reg'11atory Guide 1.89.
Response
See Attachment A.
Item (2)
The measurement capability of 600,000 gallons is based.on recent plant designs. For older plants with smaller water capacities, licensees may propose deviations from this requirement based on the available water supply capacity at their plant.
Response.
The maximum flood level in containment is calculated to be 5.66 ft. in accordance with our analysis submitted June 11, 1982, and concurred in your letter of July 19, 1983. Level transmitters have an indicating length of!0-90".
Item (3)
Narrow-range water level monitors are required for all sizes of sumps but are not required in those plants that do not contain sumps inside the containment.
Reeponse Redundant safety grade level transmitters are installed in the reactor
' building sump, and provide indication from the bottom to the top of the sump.
Item (4) -
for EUR pressure-suppression containments, the emergency core cooling system.(ECCS) suction line inlets may be used as a starting reference point-for the narrow-range and wide-range water level monitors, instead of.the bottom of the suppression pool.
iResponse N/A-
' Item-(5)-
The' accuracy requirements of the water J.evel monitors shall be provided and justified to be adequate for their intended function.
Response
(See Attachment B).
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ATTACHMENT A DESIGN AND QUALIFICATION OF THE CONTAINMENT WATER LEVEL MONITORS (1) Seismic / Environmental Qualification - Containment water level instrumen-tation has been designed as nuclear safety related, class IE and meets the applicable requirements of Reg. Guide 1.89, 1.97 and IEEE 323-1974.
(2) Single Failure - There are four (4) containment water level transmitters; redundant sump level transmitters, and redundant reactor building level transmitters. One sump transmitter and one building transmitter comprise Train "C".
The remaining sump and building transmitter are in Train "D".
(3) Power Sources - Train "C" receives power from 120V Vital Buss "C".
Train "D" receives power from 120V Vital Buss "D".
(4) Availability - All containment level instruments provide continuous display to the control room.
(5) QA Requirements - The portion of the containment level indication external E
to the Control Room panel has been designated nuclear safety related under the applicable section of the GPUN OQA Plan.
(6)
Continuous Indication - See (4).
(7)
Recording Instrumentation - Level is continuously indicated and recorded in the main control room. An isolated analog voltage (0-10V) signal is routed to each recorder.
(8) Display Instrumentation - Level indicators are located on the main control room console section CR.
Level signal is also input to the plant computer.
(9)
Isolation - Each transmitter sends its level signal to a dedicated receiver which contains a 1cvel indicating meter, system controls, and a regulated D. C. power supply. The analog output of the receivers is a current signal (4-20ma) which is converted to a voltage (0-10V) analog signal by Foxboro
-signal conditioning equipment.
Isolated outputs are provided to the non-safety plant annunicator and plant computer.
(10) Testing - The containment water level monitors will be calibrated each rufueling.
Sur Tillance requirements have been addressed in Tech Spec.
Change Request 114.
(11) Surveillance
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(12) Removal from Service - The containment water level monitors are designed such that most functional tests can be performed on line without af fecting other reactor systems. Any testing that is required to be performed offline shall not be required to be performed at less than 18 month intervals.
Integrity of level instrumentation can be readily checked via selector switch (located on each level receiver).
(13) Access for Adjustment - Level indicators are located on the main control room and are readily accessibic for adjustment.
The receivers and signal conditioning equipment are located in equipment cabinets in the relay room. Transmitter calibration is performed at the receiver which is easily accessible for maintenance.
(14) Anomalous Reading - Anomalous readings are reduced to a minimum by (2), (3) and (9).
(15)
Ease of Repair - See (13)
(16) Directly Measured Variable Sensors, - The level transmitters are designed such that a float moves with fluid level along the vertical length of a tube. The float magnet actuates reed switches of the voltage divider producing a signal proportional to fluid level.
(17) Normal / Accident Ranges - See Response to Item (2)
(18)
Periodic Testing - Sao (10)..
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ATTACHMEh"r B INSTRUMENT ACCURAC" AND RESPONSE TIMES
. (1). RB Water Level Monitoring (la) Instrument Block Diagram ALM' tt Z/8 LR O
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3 E
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- (lb) ' Module Parameters f 5 6
1
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Module 1 LT 806
-k RB Water Level A Transmitter GEM Transamerica Delaval Ref: Gem Product Spec Span: 0-90" Accuracy: i 0.5" Max.
Module 2 LY 806A RB Water Level A Receiver GEM Transamerica-RE 36562 Ref: Gez Product Spec Accuracy: 1 2% Upper Limit Module 3-LY 806B.
Current to Voltage Converter Foxboro N2AI-I2V Ref: Fox Spec Sheet T1 2AI-130 Output Span: 0-10V
' Accuracy: -i.25% of Output Span Supply V Effect: 1 0.2% span for 5% change Ambient Effect: i.5% Span Max. for 50 degree F change
.-Modale 4 LR 804/806 Level Recorder Foxboro N226S 26 Ref. Fox Prod. Spec. PSS 9-7 CIA Recording Accuracy:
.75% span
-Ambient T Effect: <.75% for 50 F change Supply V Effect: < 1% for 5% change Span 0-10V/0-90" d,
ii.
Module 5 LYC 806A E to E Isolation Converter Foxboro N2AI-I2V Ref. Foxboro Spec Sheet TI 2AI-130 Output Span:
0-10V Accuracy: i.25% Span Supply V Effect: i 0.2% Span for 5% change Ambient T Effect: i.5% Span for 50 degree F change Module 6 LI 806 Level Indicator Bailey RY 211 Ref. Bailey Prod. Instr. E12-9-2 Span 0-90" Accuracy: 1 1.0% Span Supply V. Effect: i.03% Span Per V dc =.18% for 5% change Deadband 1 0.5% span Step Response: <1.60 sec.
4 (1c) Overall System Uncertainty One sigma at normal operating conditions Recorder loop Sr = 1 1.90" Indicator loop Si = 1 1.91" -
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