ML18153C774

Proposed Tech Spec Table 4.1-1 Re Min Frequencies for Check, Calibrs & Test of Instrument Channels

ML18153C774
Person / Time
Site:	Surry
Issue date:	10/08/1991
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18153C773	List: ML18153C772 ML18153C774
References
NUDOCS 9110150294
Download: ML18153C774 (2)

Text

ATTACHMENT 1 CLARIFICATION SURVEILLANCE REQUIREMENT TECHNICAL SPECIFICATION CHANGE FOR REACTOR PROTECTION / ESF INSTRUMENTATION

TABLE 4.1-1 (Continued)

MINIMUM FREQUENCIES FOR CHECK. CALIBRATIONS, AND TEST OF INSTRUMENT CHANNELS Channel Description Check Calibrate Test Remarks

39. Steam/Feedwater Flow and Lo~ S/G s R M Water Level

40. Intake Canal Low (See Footnote 1) D R M(1), 1) Logic Test 0(2) 2) Channel Electronics Test

41. Turbine Trip and Feedwater Isolation

a. Steam generator water level high s R M

b. Automatic actuation logic and N.A. 'R M(1) 1) Automatic actuation logic only, actuation relay actuation relays tested each refueling J

42. Reactor Trip System Interlocks

a. Intermediate range neutron N.A. R(3) M(4) 3) Neutron detectors may be excluded from flux, P-6 the calibration

b. Low power reactor trips block, P-7 N.A. R(3) M(4) 4) With power greater than or equal to the interlock setpoint, the required test shall C. Power range neutron flux, P-8 N.A. R(3) M(4) consist of verifying that the interlock is in the required state by observing the

d. Power range neutron flux, P-10 N.A. R(3) M(4) permissive annunciator window

e. Turbine impulse pressure N.A. R R FQQ1DQ1!i! l:

~ Consists of verifying for an indicated intake canal level greater than 23'-6" that all four low level sensor channel alarms are not in an alarm state.

Cslibratign Consists of uncovering the level sensor and measuring the time response and voltage signals for the immersed and dry conditions.

It also verifies proper action of instrument channel from sensor to electronics to channel output relays and annunciator. Only the two available sensors on the shutdown unit would be tested.

1) The logic test verifies the three out of four logic development for each train by using the channel test switches for that train.

2) Channel electronics test verifies that electronics module responds properly to a superimposed differential millivolt signal which is equivalent to the sensor detecting a "dry" condition.