ML19262C100
| ML19262C100 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 01/22/1980 |
| From: | Moody D Maine Yankee |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578 WMY-80-14, NUDOCS 8001280295 | |
| Download: ML19262C100 (5) | |
Text
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TURNPIKE ROAD (RT. 9) y S[7%
ENGINEERING OFFICE WESTBOR o, M ASSACHUS ETTS 01581 w,
617-366-9011
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B.3.2.1 January 22, 1980 MiY 80-14 United States Nuclear Regulatory Commission Washington, D.C. 20555 Attention:
Office of Nuclear Reactor Regulation Mr. Harold Denton, Director
References:
(a) License No. DPR-36 (Docket No. 50-309)
(b) NUREG-0578 - Lessons Learned Task Force Status Report and Short Term I'ecommendations dated July, 1979 (c) USNRC Letter to All Operating Nuclear Power Plants dated September 13, 1979 (d) USNRC Letter to All Operating Nuclear Power Plants dated October 30, 1979
Dear Sir:
Subject:
NUREG-0578, Item 2.1 3.b Instrumentation for Inadequate Core Cooling In accordance with the requirements of References (c) and (d), the following information relative to Instrumentation for the detection of inadequate core cooling is hereby submitted.
The below listed instrumentation presently exists for Maine Yankee operators to utilize in making an assessment as to whether or not a condition of inadequate core cooling exists.
Although not all instrumentation provides an exact quantitative measurement, the use of combinations of available data provides the operators the necessary information to determine that sufficient core cooling is being provided.
1.
Core Etit Thermocouples 20 0-9000F Computer (to be extended to 23000F) 2.
Hot Leg RTD's 4/ loop NR 515-6650F MCB/M 1/ loop NR 515-6150F MCB/M, Computer 1 extra in Loop 2 515-6650F Computer 3
cold Leg RTD's 4/ loop NR 465-6150F MCB/M 1/ loop NR 515-6150F MCB/M, Computer
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~1816 156 8001280 gy U
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United States Nuclear Regulatory Commission January 22, 1980 Mr. Harold Denton, Director Page 2 9
1/ loop WR 0-6000F MCB/M, Computer 1/ loop WR 0-6000F MCB/R 1 extra in Loop 2 465-6150F Computer 4.
Computer Saturation Monitor 1
NA Computer 5.
Pressurizer Pressure 4
1200-2400 psig MCB/M 2
1500-2500 MCB/M, psig MCB/R, Computer 2
0-1600 psig MCB/M, Computer 6.
Pressurizer Level 2
0-100%
MCB/M, MCB/R, Computer 1 (cold-cal.)
0-100%
MCB/M
- 7.. RCS Loop Flow 4/ loop
-4 to 80 psid MCB/M 1/ loop 0-100%
MCB/M 8.
RCS Total Flow 4
0-100%
MCB/M, Computer 9.
RC Pump Amps 1/ pump 0-1000 amps MCB/M 10.
S. G. Level 4/SG NR 0-100%
MCB/M 1/SG NR 0-100%
MCB/M, MCB/R 1/SG WR 0-475" MCB/M, Computer 11.
S. G. Pressure 4/SG 0-1000 psig MCB/M, Computer 12.
Aux. Feedwater Pump Amps 1/ pump 0-75 amps MCB/M
' Method of display MCB/M
- Main Control Board meter indication MCB/R
- Main Control Board recorder indication Computer - Operator selection of computer output displays incit ding digital voltmeter, strip chart, group or point typewriter trending or. spacial programs (i.e., core exit thermocouple maps) lhlb,
United States Nuclear Regulatory Commission January 22, 1980 Mr. Harold Denton, Director Page 3 Maine Yankee also anticipates that installation of a CE subcooled margin monitor will be accomplished during the present refueling shutdown outage period (see attachment for information on subcooling meter).
Additionally, the margin to saturation will be computed in the main plant computer and displayed continuously on the main control board CRT monitor.
Procedures will also be available to the operators to provide guidance in the use of steam tables.
We trust that this submittal is satisfactory; however, should additional information be renuired.please contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPAMY
$5/
D.
. Moody Manager of Operations EWJ/sec
\\816.1SS
Attachment A INFORMATION REQUIRED ON THE SUBC00 LING METER Disp 1ay Information Displayed (T-Tsat, Tsat, Press, etc.)
Tsat and/or Psat Display Type (Analog, Digital, CRT)
Digital Continuous or on Demand Continuous Single or Redundant Display Single Location of Display Main Control Board 25UF Low Margin Alarrt Alarms (include setpoints) 40 F Loss of'Steadv S 0
Worst Case 120F Overall uncertainty (*F PSI)
_orst case 180 osia '
W Range of Display 4 Dig.it Displav IEEE 323-1974 Qualifications (seismic, environmental, IEEE323)
IEEE 344-1975 Calculator Type'(process computer, dedicated digital or ana og calc.)
Dedicated Digital If process computer is usea specify availability. (% of time) s
- Single or redundant calculators Single Selection Logic (highest T., lowest press)
T-High, P-Low IEEE 323-1974 Qualifications (seismic, environmental IEEE323)
IEEE 344-1975 Calculational Technique (Steam Tables. Functional Fit, ranges) Steam Tables Input Temperature (RTD's or T/C's)
T/C's Temperature (number of sensors and locations) 2 ' Core Exit 0
Range of temperature sensors 0-750 F
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18f 6.159 -
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6 es
Uncertainty *.of temperature sensors (*F at 1 )
See Hote 1 o
g Qualifications (seismic, environmental, IEEE323)
Control Grade Pressure (specify instrument used)
Fisher & Porter 50EP1000 Pressure (number of sensors and locat. ions) 3 Pressurizer Pressure 0-1600 osi Range of Pressure sensors 1500-2500bia: 0-3250 bsig Normal Conditions + 1%
~~
Uncertainty
- of pressure sensors (PSI at 1 )
Accident conditions 5.78%
IEEE 323-1971 Qualifications (seismic, environmental, IEEE323)
IEEE 344-1975 Bachrp Capability Yes Availability of Temp & Press Yes Availability of Steam Tables etc.
. Training of' operators Yes i
Procedures Yes I
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Notes: 1.
0-530 F-1 2"F g
8 530-750 F 1 3/8%
1816 160 g
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