ML20070N441

Procedure for Check of Operation & Response of Water Activity Monitor Sys for AGN-211 Nuclear Reactor

ML20070N441
Person / Time
Site:	05000112
Issue date:	12/15/1982
From:	OKLAHOMA, UNIV. OF, NORMAN, OK
To:
Shared Package
ML20070N400	List: ML20070N417 ML20070N424 ML20070N441 ML20070N449
References
PROC-821215, NUDOCS 8301250510
Download: ML20070N441 (3)

Text

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Procedure for the check of the Operation and Response of the Water Activity Monitor System for the AGN-211 Nuclear Reactor Frequency - every 6 months (to be done in conjunction with the' calibration check of the Water Monitor ratemeter system)

A. Specification The Water Activity Monitor consists of a NaI(TI) detector and preamp connected to a ratemeter. The NaI(TI) detector is mounted inside a cylinder constructed of aluminum through which the outlet water from the reactor pool passes. This procedure will be used to check the operation of the entire Water Monitor System to ensure that it will respond to a known gamma activity, will produce a known reading ar.d will cause a reactor scram condition to occur.

B. Procedure to be used to check the system

1) The calibrated gamma (G-331) source will be placed in the proper position for the response check. The proper position will be the hole drilled into the small wooden block inserted in a lead brick.

This lead brick is located on the top of the shield.

2) Calculate the reduction in radiation intensity due to decay since the i

last calibration check.

3) Record the response of the Water Monitor Ratemeter in CPM. The ,

response should be within 20% of the last response corrected for decay.

4) Log the results of the calibration check on the documentation sheet, If the response of the system is not within the specified limits, notify the Reactor Supervisor.

8301250510 830118 PDR ADOCK 05000112 G PDR

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Documentation Sheet for the Calibration i

of the Water Monitor Ratemeter and the System Operational Response check A) Ratemeter and Preamplifier tests and checks.

1) Mechanical meter zero .

2) Electrical zero check .

3) System High Voltage check .

4) 3600 CPM test -

5) Pulse generator frequency check 1

Range (CPM) Pulse Generator Output (PPS-CPM) Meter Reading (CPM) Comments 100 1.0 - 6C) 200 1.0 - 0 6_0 200 j[ - 120 500 j[ - 120 1k 10 - 600 2k 10 - 600 2k 20 - 1,200 i

Sk 20 - 1,200 10k jy) - 1,200 10k 100 - 6,000 20k 100 - 6,000 20k 200 - 12,000 50k 200 - 12,000 100k 1,000 - 60,000 200k 1,000 - 60,000 200k 2,000 - 120,000 500k 2,000 - 120,000

6) Discriminator check .

7) Preamplifier gain test .

8) Ratemeter returned to standard operating configuration .

Water Monitor System Response Check

1) Cs-137 source (27.5 mci on 3-19-63) activity in mCis .

2) Cs-137 source activity at time of last test .

3) % of change in Cs-137 activity .

4) Ratemeter response a) CPM on the range.

b) CPM on the range.

5) Previous ratemeter response a) CPM on the range.

b) CPM on the range.

6) % change in response . Response to be within 20% of last reading corrected for decay unless Water Monitor system has been changed then describe system change:

7) Does the Water Monitor System cause a scram condition to occur when the ratemeter countrate exceeds the Water Monitor Scram set point? .

8) Calibration and Response tests performed by on .