ML20024B109

Startup Test Procedure 23A,Feedwater Control Sys.

ML20024B109
Person / Time
Site:	LaSalle
Issue date:	06/24/1983
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20024B100	List: ML20024B099 ML20024B103 ML20024B104 ML20024B107 ML20024B109 ML20024B110 ML20024B111 ML20024B112 ML20024B115 ML20024B116 ML20024B119
References
PROC-830624-03, NUDOCS 8307050220
Download: ML20024B109 (2)

Text

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l STARTUP TEST PROCEDURE 23A FEEDWATER CONTROL SYSTDI

1. PURPOSE A. The purpose of this test is as follows:

1. To demonstrate' satisfactory reactor water level and feedwater flow rate control. Measurements of feedwater system stability and performance are analyzed for this determination.

2. ACCEPTANCE CRITERIA A. Level 1

1. In the automatic mode, the response of any level system con-trolled variable to any test input change or disturbance must not diverge.

E. Level 2

1. Level control system-related variables may contain oscillatory modes of response. In these cases, the decay ratio for each controlled mode of response must be less than or equal to 0.25.

2. The average rate of response of the feedwater turbines to large (greater than 20%) step disturbance shall be between 10 percent to 25 percent of pump rated flow /second. This average response rate will be assessed by determining the time required to pass linearly through the 10% and 90% response points of the flow transient.

3. The dynamic flow response of each feedwater actuator (turbine or-valve) to small (less than 10%) step disturbances in the manual mode shall be:

a. Dead time s 1.0 sec.

b. Maximum time to 10%* s 1.1 sec.

c. Maximum time from 10% to 90%* s 1.9 sec.

d. Settling time to within +5% of the final value s 14.0 sec.

e. Peak overshoot

• s 15%

• % of input step disturbance.

8307050220 830624 (DRADOCK 05000373 PDR

'STP #23A.

Page 2 C. Level 3

1. Transmitters, square root converters, summers, recorders, etc.

of the total feedwater flow and steam' flow circuits shall be calibrated and adjusted properly so that the total steam flow-recorder indication matches the total feedwater flow recorder indication within +4% of rated feedwater flow.

3. RESULTS Test Condition 3.

Some tuning has been performed on feedwater open and. closed flow loops.

' Problems were encountered obtaining equal responses from the A and B turbine driven reactor feed pumps. Work was performed during the May outage to identify and repair any mechanical problems in the system.

Future testing in Test Condition 3 will include retuning the open and closed flow loops, flow loop stability verifications, level loop tuning and level loop stability verification.