ML20070B496

Form NEL-003 Sheets 1 & 2, Procedure for Semiannual Control Rod Worth Determination

ML20070B496
Person / Time
Site:	University of Utah
Issue date:	05/25/1988
From:	UTAH, UNIV. OF, SALT LAKE CITY, UT
To:
Shared Package
ML20070B459	List: ML20070B456 ML20070B488 ML20070B496 ML20070B498 ML20070B501 ML20070B504 ML20070B509 ML20070B516 ML20070B519 ML20070B521 ML20070B523 ML20070B527 ML20070B530 ML20070B534
References
NEL-003, NEL-3, NUDOCS 9101310197
Download: ML20070B496 (2)

Text

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Form NEL 003 Sheet 1 RSC Approval: F2548 o

PROCEDURE FOR SEMI-ANNUAL I CONTROL ROD WORTH DETERMINATION Objective: To calibrate and check the operation af the control rods to insure they are capable of performing their intended function and the reactMty worth of the rods will meet technical specifications. (TRIGA Technical Specification 4.3.1(1))

Procedure:

1. Connect the reactor Encar power output signal to the y axis of an x y recorder.

Place the x axis in the time base mode with a sweep speed of 5 seconds / inch.

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- 2. Check out the reactor and bring to a power level between 1 and 2 kW with the regulating rod in its fully up position,

3. Adjust the recorder to give full deflection on the graph paper when the reactor is at steady power and zero denection when the zero check button is depressed.

4. Start the time sweep and at a major division of the graph paper, drop the regulating rod by cutting the magnet current to that control rod.

5. Record the normalized power values on the calculation sheet on the revers,e side of this form at the times specified.

6. Leaving the regulating rod in the down position, bring the reactor to a pcwor of 1 to 2 kW and repeat steps 3-5 only for the shim. safety rod. This will determine the shutdown margin with the safety out, t

7. - Record the position of the shim rod when dropped. This may be determined by taking the ratio of the distance required to drive the shlm rod to the critical power level (may be rneasured by the difference in distance between the positions of a permanent mark on the shim rod drive cable at the initial and critical power levels) to the distance required to fully withdraw the shlm rod. ,

8. Withdraw the regulating rod to its up position and bring the reactor to a power of - 7 1 to 2 kW with the shim.

g. Proceed with steps 3 to 5 for the safety rod. >

10. Perform the calculations on the calculation sheet.

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11. . Dato completed:

12, Senior Operator's signature:

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I i , Form approved by Reactor Safety Committee:

Reacter Administrator: [ t Date: May 25.1988 bf 97 680931 O hCK07000m PDR u

__ - _ _ _ . ~ - .av.- +~ ~~--<---,--m - , - ~ ' -~ - ' ' ~ ' ' ~ " ~ ~ ~ ~ " * ~ " ~~ * " ' ~ ^ " * ~ '

Form NEL oo3 Sheet 2 RSC Approval:!V2548 i

OONTR31.RODWORTH ,

,. CALC 4AAT10N SHEET i-l time P/Po ,

(sec) Reg Shim Safety i

1 v

0 15 25 Position Up Up i,

1. Compare normalized power with the Rod Drop computer program output to determine worth for the regulating and safety rods and record data below.

2. Compare nonnalized power with the Rod Drop computer program output to determine the shutdown margin with the safety fully withdrawn from the sNm drop information.

Shut (town margin with the safety fully withdrawn: $ ,,,,,

3. Determine the sNm worth by renormalizing the rod wntth curve to the shutdown margin determined in step 2 from where the shim. was dropped. . _. . _ , _ . . . . . _

4. - Sum the worth of the safety rod and shutdown margin determined in steps 1 afd 2, respectively and

, subtract the worth of the most reactive rod to determine the shutdown margin. Record below.

5. Sum the worth of the shim and regulating rods and subtract the shutdown margin from below to determine the excess reactivity. Record below, t

6. Core confguration number this test performed on .

7. - Determine rod drop times (less than 2 seconds as required by TRIGA Technical Specirmation 3.3.1):

Safety Rod: seconds Shim Rod: seconds Regulating Rod: seconds

.B00. WQaT113 Safety: $ Shutdown Margin: $' (> $.50)*

Shimi $ Excess Reactivity: $ (< $2.80)"

Reg: $

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• Required by Technical Specircations 3.2(1).

" Required by Technical Specifmations 3.2(4).

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