ML20101S462
| ML20101S462 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/01/1985 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20101S451 | List: |
| References | |
| NUDOCS 8502050414 | |
| Download: ML20101S462 (2) | |
Text
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i Channels subject only to " drift" errors induced within the instroentation itself can tolerate longer intervals between calibrations. Process system lastroentation errors induced by drift can be expected to remain within acceptable tolerances if recalibration is performed at the intervals of each refueling period.
Substantial calibration shifts within a channel (essentially a channel failure) vill be revealed during routine checking and testing procedures.
Thus, minimum calibration frequencies s,.
forth are considered acceptable.
Testins On-line testing of rea: tor pr:te: tion channels is required once every fcur weeks on a rotational or perfectly staggered basis. 'Ihe rotation scheme is designed to reduce the probatility of an undetected failure existing within the system and to mir.izize the likeliheed cf the came systematic test errers being intr:duced into each redur. dant channel.
The rotatics schedu.le for the reacter protection channels is as follows:
Chs.nels A, B, C, & D Before Startup, when shutdown greater than 21. hours Channel A One Week After Startup Char.nel E Two Weeks After Startup Channel C Three Weeks After Startup Channel D Four Weeks After Startup The reactor protection system instrumentation test cycle is continued with one channel's inst.rumentation tested each week. Upon detection of a failure that prevents trip action in a channel, the instrumentation associated with the protection parar.eter failure vill be tested in the renkining channels.
If actuation of a safety channe3 occurs, assurance vill be required that actuatier. was within the Jimiting safety system setting.
The 'rotection channels coincidence logic, the control rod drive trip breakers and: 1e regulating control rod power SCRs are trip tested every four weeks.
The. rip test checks all logic combinations and is to be performed on a rotational basis. The logic and breakers of the four protection channels and j
the regulating control rod power SCRs shall be trip tested prior to startup when the reactor has been shutdown for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Discovery of a failure that prevents trip action requires the testing of the instrumentation associated with the protection parameter failure in the remaining channels.
8502050414 850201 PDR ADOCK 05000289 PDR P
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TABLE 4.1-1 INSTRUMENT SURVEILLANCE REQUIREENTS
--~d CHANNE8 DESCRIPTION.
CHECK TEST
- CALIBRATE
' REMARKS t
1.
Protection Channel NA M
NA Coincidence Logic 2.
Control Rod Drive Trip NA M
NA Includes independent testing of shunt trip and i
Breaker & Regulating Rod undervoltage trip features.
Power SCRs 1i.
3.
Power Range Amplifier D(1)
NA (2)
(1) When reactor power is greater than 15%.
(2) When above 15% reactor power run a heat balance check once per shift. Heat balance calibration shall be performed whenever heat balance exceeds indicated neutron power by i
more than 2%.
a:
L 4.
Power Range Channel S
M M(1)(2)
(1) When reactor power.is greater' than 60% verify imbalance using incore instrumentation.
(2) When above 15% reactor power calculate axial offset upper and lower chambers after each startup if not done within the previous 7 days.
1 5.
Intermediate Range Channel
.S(1)
P NA (1) When in service.
6.
-Source Range Channel S(1)
P NA (1) When in service.
p t
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R 7.
Reactor Coolant Temperature S
M R
- j. j Channel 1
n 8.
High Reactor Coolant S~
'M R
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Pressure Channel iw
- 9.
Low Reactor Coolant
-S M
R
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Pressure Channel IO i