ML20136H526

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Defueling Procedure for Univ of California,Santa Barbara, L-77 Reactor
ML20136H526
Person / Time
Site: 05000433
Issue date: 10/11/1985
From: Conners C, Rachel Johnson, Page J
ROCKWELL INTERNATIONAL CORP.
To:
Shared Package
ML20136H515 List:
References
PROC-851011, NUDOCS 8511250129
Download: ML20136H526 (11)
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PROGR AM TITLE L-77 Reactor ner, mil'I N DOCUMENT TITLE Defueling Procedure for the UCSB L-77 Reactor DOCUMENT TYPE KEY NOUNS Detailed Work Procedure L-77, UCSB ORIGINAL ISSUE DATE REL. DATE APPROVALS DATE C. C. Conners c -

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DISTRIBUTION ABSTRACT MA

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NAME A R This procedure documents the detailed work procedure r

required to defuel the UCSB L-77 reactor.

  • J. Carroll (6 )

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  • C. C. Conners '

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  • R. P. Johnson T006
  • J. Mills LB02
  • E. Powell T201
  • J. Wal te r T006
  • L. J. Jones LB26
  • V. Keshishian LA19
  • L. Bienvenue LB01
  • W. Nagel.

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  • D. L. Speed T100
  • J. P. Page T006
  • R. J. Tuttle T100
  • H. E. Remley LA06
  • R. C. Courtright DB27 RESERVED FOR PROPRIETARY / LEGAL NOTICES BS11250129 e51025 PDR ADOCK 05000433 5957F/ kip p

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N001DWP 100003 Page: 2 CONTENTS Page 1.0 Introduction.......................................................

3 2.0 Safety.............................................................

4 3.0 Responsibility.....................................................

5 4.0 De fuel i n g P roc e du re................................................

6 5.0 Qual i ty As s u ra nc ?..................................................

9 6.0 References.........................................................

10 FIGURES 1.

F u el Tr a n s fe r Lay ou t...............................................

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1.0 INTRODUCTION

The UCSB L-77 reactor is to be defueled in preparation for dismantling so that the reactor facility will be rendered fit for other use. Described in the following sections are the safety requirements and procedures to defuel

'the reactor.

An application will be made to NRC for a Dismantling Order at least 6 months prior to the scheduled start of the dismantling activity.

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N001DWP00003 Page: 4 2.0 SAFETY The Health and Safety requirements shall be in accordance with References 1, 2, and 3.

A Rocketdyne Health and Safety representative will be present during all defueling procedures and will provide radioactive survey services as required for defueling personnel.

The following radiation survey instruments will be used to detect fixed and removable contamination during defueling operations:

o Fixed contamination--Ludium Model 12 portable count rate meter with 43-5 alpha scintillation probe or equivalent Removable contamination--Smears of 100 cm2 counted on gas o

proportional or scintillation detection equipment or equivalent.

The limits of the Model F1-10-1 shipping drum (certificate of compliance number USA /9009/BC)F for U0 S04 solution are 950-g U-235 and no more than 2

18-W decay heat load. The maximum amount of L-77 fuel to be loaded into a single container is approximately 715-g U-235. The maximum decay heat load per single container is estimated to be less than 0.01 W.

While these containers are certified as Fissile Class 1, which allows unlimited numbers to be shipped together, interaction between bottles must be considered when a bottle is outside the shipping drum. To eliminate the need for further consideration of interaction, the first or subsequent fuel bottle must be positioned at least 12 ft away from any other shipping container during filling and must be returned to its shipping container after filling.

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N001DWP00003 Page: 5 3.0 RESPONSIBILITY The Rocketdyne site representative will oversee the conduct of work for the UCSB L-77 reactor defueling activities and will arrange for support as

-required. UCSB shall provide Chemical and Nuclear Engineering Department staff personnel to monitor reactor status (licensed reactor operator) on the control console and to perform fuel transfer operations during reactor defueling. Rocketdyne shall provide a Health and Safety site representative to radioactively monitor the defueling activities.

Theseoperationsare~performedundertheauthorityofEheUCSBreactor license R-124. This license allows defueling subject to review and approval by the University Reactor Safety Review Committee. Dismantling operations require approval by NRC in a Dismantling Order issued under 10 CFR 50.82.

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6 4.0 DEFUELING PROCEDURE The following shall be done to defuel the L-77 reactor (reference Figure I):

1) Prepare a staging area of plastic sheeting on the reactor room floor.

Include a step-off pad. Run the plastic sheeting up the reactor tank wall to include the fuel port. Position an empty fuel bottle / shipping container near the reactor tank and cover with plastic sheeting. Prepare the fuel transfer system per Figure 1.

2) Connect an air drying tube (filled with Dri-rite material) to the gas inlet nozzle.
3) Remove the fuel port cover panel.
4) Line the fuel port with (a) one layer of plastic sheet and (b) one layer of absorbent paper.
5) Connect a fuel transfer'line to the fuel outlet nozzle.
6) Perform and record the last reactor checkout. Verify "BOTH RODS IN" readings on LIN and LOG-N channels are the same as recently recorded values. This constitutes the baseline value for adequate shutdown of the reactor.
7) Position the safety rod at the "UP" position and verify " SAFETY R0D OUT" readings on LIN and LOG-N channels are same as previously recorded valves.
8) Verify all fuel transfer valves are closed.
9) Prepare fuel bottle for fuel transfer by inserting the fuel transfer line/ vacuum line into the bottle.
10) Open the gas valves V1 and V7.

Observe loss of vacuum scram and record pressure at scram point.

Verify that the LIN and LOG-N channels readings have decayed to the "BOTH RODS IN" configuration.

Allow reactor core pressure to increase to atmospheric.

11) Open V5 and establish a 29-in. Hg vacuum in tank T1.
12) Close V5.
13) Open V3 and V4 to initiate fuel transfer.

Regulate fuel flow by adjusting V4.

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14) When fuel bottle is filled to the premarked line,* close V3 and V4.

Open V8 to vent fuel bottle to atmospheric pressure, close V8.

Remove fuel transfer line and cap and seal fuel bottle.

15) Replace filled fuel bottle with empty fuel bottle.
16) Repeat Steps 11 through 15 until all fuel has been transferred from the reactor core to fuel bottles.
17) Establish a 10-15-in. Hg vacuum in reactor core by closing V7 and opening V6.
18) Close V6.
19) Transfer 1 liter of distilled water to core by inserting the fuel transfer line into the water reservoir and opening V3.
20) Close V3 when transfer is complete and core vaccum has increased to atmospheric pressure.

21 ) Open V7.

22) Repeat Steps 11 through 15 to transfer rinse water to empty fuel bottle precalibrated to indicate 10 liters.
23) Repeat Steps 17 through 22 one additional time.
24) Close all valves.
25) Remove fuel transfer line from fuel port. Replace fuel cap.

Mix fuel solution and rinse water well before taking samples.

26) Obtain a 10-cc sample from each fuel bottle and rinse solution bottle for analysis.
27) Observe and record final defueled reactor instrument readings.
28) Remove PuBe source from source thimble, store source in source storage container.
29) Prepare fuel solution for shipment per Reference 4.
30) Remove plastic sheeting from fuel transfer staging area, and store as radioactive waste.

31 ) Perform final radiation survey.

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  • Each fuel bottle will be precalibrated to indicate 10 liters.

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9 5.0 QUALITY ASSURANCE The Quality Assurance requirements shall be in accordance with N001PP000002.

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N001DWP100003 Page: 10

6.0 REFERENCES

1.

Rocketdyne Standard Operating Policies 2.

N001PP000002, "QA Program Plan for Packaging Licensed Radioactive Materi-als for Shipment," Rev. B, July 31, 1985 3.

N001SRR140061, " Radiation Safety Plan for Offsite Operations," Rev. A, October 29, 1984 4.

Y. J. Schaubert, "UCSB Fuel and Waste Shipping Plan," N001TIl00026, April 16,1985

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