ML20247N264
| ML20247N264 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/26/1989 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20247N242 | List: |
| References | |
| NUDOCS 8908020345 | |
| Download: ML20247N264 (3) | |
Text
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Calibration l
calibration shall be performed to assure the presentation and acquisition of accurate information. The nuclear flux (power range) channels amplifiers shall be checked and calibrated if necessary,.
every shift against a heat balance standard. The frequency of heat-balance checks will assure that the difference between the out-of-core instrumentation and the heat balance remains less than 4%.
Channels subject only to " drift" errors induced within the instrumentation itself can tolerate longer intervals between calibrations. process system instrumentation errors induced by drift
.can be expected to. remain within acceptance tolerances if recalibration is performed at the fntervals of each refueling period.
Substantial calibration shifts within a channel (essentia11,y a channel failure) will be revealed during routine checking and testing procedures.
Thus, minimum calibration frequencies set forth are considered acceptable.
. Testing On-line testing of reactor protection channels is required monthly on a rotational basis; The rotation scheme is designed to reduce the probability of an undetected failure existing within the system and to minimize the like11 hood of the same systematic test errors being introduced into each redundant channel.
The rotation schedule for the reactor protection channels is as follows:
a) Channels A, B, C & D Before Startup, when shutdown greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and b) ' Monthly'with'one channel being tested per week on a continuous sequential rotation.
The reactor protection system instrumentation test cycle is continued with one channel's instrumentation tested each week. Upon detection of a failure that prevents trip action in a channel, the instrumentation associated with the protection parameter failure will be tested in the remaining channels.
If actuation of a safety channel occurs, assurance will be required that actuation was within the limiting safety system setting.
The protection channels coincidence logic, the control rod drive trip mtoo breakers and the regulating control rod power SCRs electronic trips, 48@
are trip tested monthly. The trip test checks all logic combinations gg and is to be performed on a rotational basis. The logic and breakers om of the four protection channels anJ the regulating control rod power "O
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 />.
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Discovery of a failure that prevents trip action requires the testing of the instrumentation associated with the protection parameter g
failure in the remaining channels.
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