ML20235J197

Submits Description of Cask NAC-1E Decontamination Process, Including Chemicals Used & Associated Concentrations & Temps,Per

ML20235J197
Person / Time
Site:	07109183
Issue date:	09/10/1987
From:	Dixon G NAC INTERNATIONAL INC. (FORMERLY NUCLEAR ASSURANCE
To:	Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
28564, GND-87-137-QAD, NUDOCS 8710010345
Download: ML20235J197 (3)

Text

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Nuclasr Assurance Corporation 5/20 gegee;ege; RETURN TU 396-55 2

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Mr. Charles E. MacDonald, Chief W

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Division of Safeguards and Transportation MNSS d U. S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

NAC-1E Spent Fuel Shipping Cask RE:

NAC Letter (FLD/87/138/ETS dated 9/3/87) To Your Office

Dear Mr. MacDonald:

As notoa in the above referenced letter, information concerning the decontamination process would be provided in a separate report. The following describes the process, chemicals used and associated concentrations and temperatures of same.

DECONTAMINATION OF NAC-1E CASK The NAC-1E cask was decontaminated in the 221-H Canyon swimming pool, and Hot Shop using several types of chemicals.

Listed below are types of chemicals used, volume, temperature, and hours:

Internal Cleaning a)

Flushed 4,000 pounds of 75% caustic through vessel at 80 C.

b)

Flushed 2,000 pounds of process water through vessel at 50*C.

c)

Flushed 4,000 pounds 10% acid

.25% KMN04 through vessel at 80 C.

d)

Flushed 2,000 pounds process water through vessel at 50 C.

e)

Flushed 4,000 pounds 10% oxalic acid through vessel at 80 C.

f)

Filled vessel with 180 gallons 10% acid - 25% KMN04 and sparged for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> at 80*C.

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Mr. Charles E. MacDonald, Chief September 10, 1987 Page 2 g)

Emptied solution and flushed with 2,000 pounds process water at 50*C.

h)

Filled vessel with 180 gallons 10% oxalic acid and sparged for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> at 80*C.

1)

Emptied solution and flushed with 2,000 pounds process water.

y External Cleaning a)

Using Clayton cleaner compound (caustic base) decontaminated outside of vessel. Amount approximately 25 pounds.

b)

Steam cleaned with approximately 25 pounds 5% oxalic acid on outside of vessel.

I c)

Used-brushes with 20% oxalic acid, approximately 10 pounds.

d)

Flushed with process water, approximately 1,000 pounds, e)'

Used soap pads to decontaminate high contamination spots.

As previously stated during the NRC/NAC meeting on September 2,1987, visual examination of the cask surfaces after the decontamination process disclosed no deterioration of -the surfaces.

The chemicals used are routinely at the Savannah River Plant for decontamination of stainless steel surfaces.

Should additional information be required, please feel free to contact the undersigned.

Sincerely, NUCLEAR ASSURANCE CORPORATION Ge

. Dixo r.

Corporate Mana e, Quality Assurance GND:Jeb i

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