ML20070B519

Form NEL-009 Sheets 1 & 2, Heavy Water Reflector Element & Tank Insp Procedure

ML20070B519
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-009, NEL-9, NUDOCS 9101310210
Download: ML20070B519 (2)

Text

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. .. Form NEL 009 sheet 1 Rsc Approvat: s7s48 Heavy Water Reflector Element and Tank inspection Procedure Objective: To assure the proper procedure is followed for the removal, I inspection, venting, and reassembly of heavy water reflector vessels in the reactor during the biennial core inspections and at other times as necessary.

Procedure:

1. Check out the reactor and withdraw the safety rod but do not go to power. Maintain an operator at the console at all times during !vbich a positive reactivity insertion may occur.

2. If3 not art ofcone previously (i.e., ions), remove two fuel elements fromif this the blennialinspect

he B hexagonal ring worth a $2.50, see Kimura, p. 71 place in storage dunn inspection. Record movement in; and Operations Log and b low.

Preplanned Fuel Movement Sequence Element No. Position From: Position To:

1-2-

3. Remove the heavy water (D 0) retlecting elements from core and tank storage rack ocations.2 Survey eac1 element upon removal from the reactor tank and record the maximum radiation levelin Operations Log. For each element, unscrew the drain 31ug at the top of the element to vent into the hood in Room 1205 2 any generated gases and check the level of DgO within the element.

Add makeup D O lf the levelis less than two inches from the top of the element.2 Observe the condition of the cladding and measure using call)ers the diameter of the element at each position shown on uhe Blennial Heavy Water inspection Sheet appropriate insp)ection sheet.(Form NEL-010 . Record the inspection fo

4. Return each inspected element to its original position in the core or storage tack and record in the Operations Log.

5. Remove the dry tube irradiation canister from the D2O trapezoldal tank and secure to the side of the reactor tank or remove from the reactor tank as necessary for inspection of the polyethylene tubing. Survey the dry tube canister upon removal from reactor tank and record maximum radiation levels below:

, mR/hr at one foot mR/hr on contact Replace the polyethylene tubing section Immediately next to the l'

[o bC 'k7

, ,, Form NEL o09 Sheet 2 Rsc Ar$wov:1 STsS8 canister if radiation damage (embrittlement) is observed. Record actions in Operations Log.

6. Remove trapezoidal D 2O reflector tank from core and reactor tank usin0 the special gras aing tool attached to rope. Survey the tank upon removal for max mum radiation levels and record below.

Prepare standard radiation tag and attach to tank with the readings indicated on the tag, mR/hr at one foot mR/hr on contact Observe the condition of the surface of tank for corrosion or any abnormal appearance. Vent the tank into the hood in MEB 1205 F by removing the filling scrow. Chock the lovel of D2O inside the tank and add makeup D2 O if necessary Record inspection in Operations Log. If necessary or as directed by Reactor Supervisor, take 1cc sample of D2O for tritium monitoring by liquid scintillation counting. Indicato reading here:

pCl/ml(tritium). Compare to 10CFR20 appendix B, Tablo I/ water): 0.1 pCl/ml.

7. Return the D 2O tank to its original core position and record in Operations Log.

8. Replace the dry tubo canister in D2O tank and Jocure tho top of s the tube to the supporting beam across the top of the TRIGA tank.

Record in Operations Log.

9. Date inspection completed:

~~

10.Sonior Reactor Operator:

Form approvod by Reactor Safety committoe:

Reactor Administrator /MN / # ato: May 25.1988

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