ML19224B227
| ML19224B227 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/11/1977 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1611, TM-0080, TM-80, NUDOCS 7906140257 | |
| Download: ML19224B227 (8) | |
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DOCUMENT NO:
{!k!7f OF DOCUMENT PROUDED BY COPY MADE ON METROPOLITAN EDISON COMPANY.
Wilda R. Hullinix, URC t
7906140257 I93 111 O
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1611 U OI t,t 1]i ts l t_ L/',* j'g n e. 9f bb i
Revision 5
MASTER COPY THREE MILE ISLAND NUCLE AR STATION JO NOT REMOVH^mN sEAtra enysICs ea0CEcuae 1611
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AREA AtlD EQUIPMENT DECONTAMINATION Table of Effective Pages Page Date R evision Page Date Revision Page Date R evision 1.0 04/11/77 5
26.0 51.0 2.0 04/11/77 5
27.0 52.0 3.0 01/21/76 4
28.0 53.0 4.0 01/24/75 3
29.0 54.0 5.0 01/24/75 3
30.0 55.0 6.0 01/24/75 3
31.0 56.0 7.0 01/24/75 3
32.0 57.0 8.0 33.0 5'.0 9.0 34.0 59.0 10.0 35.0 60.0 11.0 36.9 61.0 12.0 37.0 62.0 13.0 38.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 45.0 77.0 21.0 46.0 71.0 22.0 47.0 72.0 23.0 48.0 73.0 24.0 49.0 74.0 25.0 50.0 75.0 Unit 1 Staff Reco en, o pproval Unit 2 Staff Recom end A proval Approval Date Approval
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Date Cogni4nt h/p/. Hbad Cogniz/nt d/p/ He ad Unit 1 RC Recommends Approval Unit 2 POh Reco mends Approval
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1611 Revision 5 1
04/11/77
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THREE MILE ISLAND NUCLEAR STATION STATION HEALTH PHYSICS PROCEDURE #1611 AREA AND EQUIPMENT DECONTAMINATION 1.0 PURPOSE The purpose of this procedure is to describe how to remove radioactive contamination from the surface of an area, and (or) any involved equipment.
2.0 DISCUSSION Removal of contaminants is accomplished by physical or chemical means.
Every effort must be made to prevent the spreading of contaminaticn during the removal process.
Contaminated areas are areas with loose surface contamination above the following limits:
2 (Alpha): 100 DPM/100 cm.
a By (Beta Gamma): 1000 DPM/100 cm.
3.0 REFERENCES
3.1 Radiation Protection Manual - Admin. Procedure #1003 3.2 General Dynamics H.P. Manual 3.3 HPP 1609 3.4 HPP 1618 3.5 HPP 1682 4.0 EQUIPMENT 4.1 In accordance with chart, pages 4.0 through 7.0.
5.0 PROCEDURE NOTE:
A Radiation Work Permit is required prior to entering areas with contamination levels above the limits set forth in Section 2.10 of the Radiation Prote'ction Manual 193 113 1.0 2
1611 Revision 5 04/11/77 (Beta-Gamma 1000 DPM/100 cm and Alpha 100 DPM/100 cm ).
Protective
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clothing must be worn as required by the Radiation Work Permit.
5.1 Area Decontamination 5.1.1 The enclosed chart describes decontamination agents and techniques to be used on various surfaces. The exact techniques to be used will depend on the individual circumstance. The Radiation Protection Supervisor Foreman should be contacted if further guidance is necessary.
5.1.2 Contaminated areas should be cleaned by working from the outer edges toward the center, or the top to the bottom.
5.1.3 Care must be exercised to prevent tracking of contamination to other areas.
5.2 Eouipment Decontamination 5.2.1 The enclosed chart describes decontamination agents and techniques to be used on various materials.
Whenever possible, contaminated equipment should be immersed in the decontaminating agent.
The Radiation Protection Supervisor Foreman should be contacted if further guidance is necessary.
5.2.2 For small items, the Ultrasonic Sink is available for decontamination. Other items of reasonable size should be decontaminated in the Decon Room.
For extremely large items, the decontamination pit, located in the Fuel Handling Building can be utilized.
2.0 l93 114
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1611 Revision 4 01/21/76 5.3 Af ter decontamination, smear surveys must be taken to verify that the area or equipment is in fact decontaminated.
Record results on the smear survey record (Form 1609-1, attached) which is located in the Health Physics Lab, as per HPP 1609.
NOTE:
If results show that the area or equipment is still contaminated, the decontamination process must be repeated.
5.3.1 All equipment, having been decontaminated as low as practicable, will be controlled as per HPP 1682.
5.4 All equipment used in the decontamination process must be handled as if contaminated until cleaned and surveyed.
5.5 All liquid waste generated during the decontamination process, including cleaning solutions, will be disposed of via the Liquid Radioactive Waste Disposal System, or as directed by the Radiation Protection Supervisor Foreman or Chemistry Supervisor t
5.6 All solid waste generated during the decontamination process will be disposed of in appropriate containers.
Shipment of solid waste off site will be in accordance with HPP 1618.
s 3.0 193 115
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Action Wood Abrasion, Dry Same as brick Same as brick.
Same as brick See brick.
Flame Char top surface and Complete removal of scrape off charred surface layer.
Possible breathing Pemoval of sur-layer.
hazard during decon-face.
tamination process.
It should be noted that in most cases the effectiveness of detergents, solvents, complexing agents, and similar reagents is materially increased by a brushing or scrubbing action.
Also it is usually found that the controlling factcar is whether the part has been coupletely covered by the treatment rather than the basic effective tess of the treatment method.
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