ML19270G398
| ML19270G398 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/30/1979 |
| From: | Short T OMAHA PUBLIC POWER DISTRICT |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906060275 | |
| Download: ML19270G398 (11) | |
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Omaha Public Power District 1623 HARNEY W
OMAHA, NEBRASKA 66102 e TELEPHONE $36-4000 AREA CODE 402 May 30, 1979 Director of Nuclear Reactor Regulation AI'I'l:
Mr. Robert '4.
Reid, Chief Operating Reactors Branch No h U. S. Nuclear Regulatory Cc==ission
'4ashington, D. C.
20555
Reference:
Docket No. 50-285 Gentlemen:
Attached, please find responses to questions received by the C=aha Public Power District, via telecopy, in regard to instrumentation and controls at the Fort Calhoun Station.
Sincerely,
/'
/ /l
~7 i
aa
~2.
E. Shor.
Assistant General Manager TES/KJM/3JH:Jn Att ach.
cc:
LeBoeuf, Lanb, Leity & MacRae 1333 New Hampshire Avenue Suite 1100
'4ashington, D. C.
2003o 2274 331 7906060'> w MI 5
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Responses to NRC Questions on Instrumentation and Controls Question 1 Identify the type and power supply (IE or non-IE or both) that is avail-able for each of the following loads without any viring changes:
(a) preusurizer pressure and level instrumentation and controls; (b) steen generator pressure and level instrumentation and controls; (c) proportional heaters ; and (d) backup heaters.
Where sc=e instruments and/or controls in a single system are powered from both type of sources such that the' system vill not opert.te prcperly without offsite power, so indicate in your response.
Response
Power Supplies (a) Pressurizer
- Instrumentation Pressurizer Prdssure - all are 120 7AC P-103X - Class IE AI huA CKT 7 and 20 Eus Al P-103Y - Class IE AI hos CKT 5 and 21 Bus 31 Pressurizer Level - all are 120 VAC L-101X - Class IE AI kOA C T 20 Bus Al L-101Y - Class IE AI-kOB C T 21 Bus B1 Pressurizer Pressure (RPS and ESF Initiation)
A/P 102 - Class IE AI h0A CKT 1 Bus A B/P 102 - Class IE AI h03 CKT 1 Bus 3 C/P 102 - Class IE AI-40C CKT 1 Bus C D/P 102 - Class IE AI h0D CKI 1 Bus D (b) Steam Generator Pressure to RPS and SGLS - 120 VAC A/P 902 - Class IE AI h0A CKT 5 Bus A 3/P 902 - Class IE AI h03 CKI 5 Bus 3 C/P 902 - Class IE AI h0C CKT 5 Bus C D/P 902 - Class II AI LcD CKT 5 Bus D
} '7 2
A/P 905 - Class IE AI h0A CKT 5 Bus A B/P 905 - Class II AI LOB CKT 5 Bus 3 C/P 905 - Class IE AI LOC CKT 5 Bus C D/P 905 - Class IE AI h0D CKT 5 Bus D
Response to 1(b) (Continued)
Level to RPS - all are 120 VAC A/L 901 AI h0A CKT 5 Bus A Class IE B/L 901 AI h0B CKT 5 Bus B Class IE C/L 901 AI h0C CET 5 Bus C Class IE D/L 901 AI kOD CKT 5 Bus D Class IE A/L 90h AI h0A CKT 5 Bus A Class IE B/L 904 AI h0B CKT 5 Bus B Class IE C/L 90h AI LOC CKT 5 Bus C Class IE D/L 904 AI LOD CET 5 Bus D Class IE NOTE: For location and arrangement of circuits and buses, refer to FSAR, Fig. 8.1-1.
Steam Generator A Level Control - All are 120 VAC RC-2A Regulating - Down Comer Level' Normal AI h0C CKT 9 Emergency AI h0D CXT 11 RC-2B Regulating - Devn Comer Level' Normal AI h0D Crf 13 Energency AI h0C CKT 11 (c) Pressurizer Heaters - all are h80 VAC Group 1 - MCC 3 Al - ESF Lead Shed - Channel A Cable Group 2 - MCC 3Al - ESF Load Shed - Channel A Cable Group 3 - MCC 3Al - ESF Load Shed - Channel A Cable Group h - MCC 3Cl - ESF Lead Shed - Channel A Cable Group 5 - MCC 3C1 - ESF Load Shed - Channel A Cable Group 6 - MCC 3B1 - Does Not Load Shed; Picked up by DG1 -
Cables are Channel A, but not ESF routed Pronortional
^
MCC LAl - Does Not Load Shed; Picked up by 0G2 - } Heaters Group 7 -
Cables are Channel B, but not ESF routed.
Group 8 - MCC LCl - ESF Load Shed - Channel B Cable Group 9 - MCC LC1 - ESF Load Shed - Channel B Cable
- 0n automatic transfer, feed system is switched to manual; both feeds are
~
Class IE.
2274 333
Response to 1(c) (Continued)
Group 10 - MCC LC1 - ESF Load Shed - Channel B Cable Group 11 - MCC kcl - ESF Load Shed - Channel B Cable Group 12 - MCC kcl - ESF Load Shed - Channel B Cable Question 2 Describe the centrol system for the pressurizer. The description should include the following quantitative information:
(a) Setpoint, proportional gain, integral setting, and deviation setting for each controller in the system; (b) The heater and spray valve initiation points and the associated controller settings; and (c) The power operated relief valve lift and reseat points in ter=s of controller output unless an uncompensated pressure signal is used. If an uncompensated pressare signal is used, please report the lift and recent points in psi (g or a) and clearly indicate that the lift point is not time dependent and the units of measure.
Response
The Fort Calhoun Station pressurizer control instrumentation consists of two independent systems which control pressurizer level and pressurizer pressure, respectively. Each of these control systems consists of two independent process sensing and control channels which may be selected by the operator as desired. Each of the two channels makes use of co==on actuation equipment for process :ontrol, i.e., proportional heaters for pressurizer pressure control and charging pumps for level control.
See the attached sheets for an explanation of loop operation.
The pressurizer pressure centroller response for propertional band is a 15 percent input change which gives a 100% output change; see the attached explanation.
The pressurizer level control response for proportional band is a L75 input change which produces a 100% output change; see the attached explanation. This controls the letdown valves.
2274 334
Response to Question 2 (Continued)
LR-101 X (Y) - Records pressurizer level and reactor regulating programmed setpoint.
LC-101 X (Y) -(Controller) Compares actual pressurizer level with reactor regulating prograrsed setpoint and outputs a signal that vill correct any level deviation.
LA-101 X (Y) - Will actuate pressurizer level HI level alarm.
Setpoint = 8.2% higher than progra=ed setpoint.
Reset at 7.8% higher than progra=ed setpoint.
LC-101 X (Y) - If selected by HC-101, vill energize backup heaters and stop all but one charging pump on an increasing level.
Setpoint = 5% above progra=ed setpoint. Reset = 3.3%
above progra=ed setpoint.
LCA-101 X (Y)- Will actuate pressuriser level LO level alarm and if selected by HC-101 vill actuate a backup signal to start the backup charging pumps. Setpoint - 6% below progra=ed setpoint. Reset = 5% belev progra=ed setpoint.
LIC-101 X
- Will actuate pressurizer level LO-LO level alarm.
If selected by HC-101-1 switch vill de-energize all hesters.
Setpoint = hl.5", level decreasing. Reset h2% level increasing.
LC-101-1
- Will start the first backup charging pump. Setpoint - 2 9%
below programmed setpoint. Reset = 2.6% above progra=ed setpoint.
LC-101-2
- Will start the second backup charging pump.
Setpoint =
3.3% below progra=ed setpoint. Reset = 1.7% above pro-gra=ced setpoint.
LM-101
- If HC-101-3 is in the "nor=al" position, LM-101 vill limit LCV-101-2 or LCV-101-1.
Valves vill not close any more than approximately 13% and vill not open any more than approxi-
=ately 60%. Both valves (if selected) vill travel full stroke (0-100%) if HC-101-3 is in the " Bypass" position.
HC-101
- Man-Auto transfer station and bias station.
Can be used to control either or both valves (LCV-101-1 or LCV-101-2) selected by HC-101-2 in either canual or automatic mode. Will also bias the output signal frem LC-101 X or LC-101 Y controllers to maintain level at setpoint under different operating conditions.
PCV-103-1 & - Valves will be full closed when controller output indicates PCV-103-2 62.5% andvill be full open when controller indicates 100%.
2274 335
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Response to Question 2 (Continued) The PORV's are set to open at 2392.25 psia on a two-out-of-four Reactor Protective System (RPS) High Pressurizer Pressure (HFP) trip. The Technical Specifications require FORY operation at 2k00 psia. These valves nominally reset at 2385 psia. Only a pressure input to bistable trip units is used. Questien 3 Indicate if the following signals are or are not used to generate a reactor trip in your plant. If these signals are used, also provide the setpoints for: (a) High pressurizer pressure; (b) Low lov steam generator level; (c) Lov stcan generator pressure; and (d) Lov reactor coolant flow.
Response
Bypass Instrument Tech Spe: Permissive Function System .Setpoint Limit High Pressurizer RPS 2392.25 12h00 psia Pressure psia Steam Generator RPS 33.2 31.25 Level <550 psia Steam Generator RPS 507.5 >500 psia Pressure psia 10% Reactor Coolant RPS 95% 93% Flav Lov Flow 2274 341
- e Question h Provide the range of the following instruments in engineering units:
(a) Pressurizer level; (b) Steam generator level; and (c) Reactor coolant flow.
Response
Instrunent Ranges Pressurizer Level Cold shutdown L-106: 0 to 2h4 inches. Level contrcl at temperature (L-10lX and L-10lY) 93 70 to 220 7 inches. Steam Generater Level Both Reactor Frctective and Control - 37.4 inches to 169 9 inches. Reactor Coolant Flav Reactor Protective System - Each Transmitter: 0 to 70 psig; total flov - all h stems generator (1 per pump) signals surrei. There are to direct flev readouts in GPM; only one channel into computer calculates a GPM. 2274
- 42
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