ML19224B095
| ML19224B095 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/28/1976 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1687, TM-0106, TM-106, NUDOCS 7906140039 | |
| Download: ML19224B095 (6) | |
Text
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t TMI DOCUMENTS DOCUMENT NO:
COPY MADE ON h
OF DOCUMENT PROVIDED BY METROPOLITAN EDISON COMPANY.
UW Wilda R. Mullinix, NRC 4
7906140039 i
e 186 2l3 I
h/ ASTER COPY Revision 0 DO NOT REMOVE
'887 01/28/76 THREE MILE ISLAND NUCLEAR STATION sf STATION HEALTH PHYSICS PROCEDURE 1637
]k CHARC0AL SAPPLING PROCEDUPE Table of Effective Pages Pace Date Revision Pace Date Revision Pace Date Revision 1.0 01/28/76 0
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1687 i
Revision 0 01/28/76 THREE MILL ISLAND NUCLEAR STATION STATION HEALTH PHYSICS PROCEDURE 1687 CHARC0AL SAMPLING PROCEDURE l.0 PURPOSE The purpose of this procedure is to provide a method of obtaining a representative sample of charcoal from adsorber filters.
Samples will subsequently be laboratory tested as required by Technical Specifications.
2.0 DISCUSSION Technical Specifications require that adsorber filters in Ennineered Safeguard Systems be tested for efficiency of iodine removal at a specified frequency.
At TMI, adsorber filters are composed of trays of impregnated charcoal placed ho;izontally in large racks.
Each filter is tested by removing one tray from the rack, obtaining a representative sample from that tray and laboratory testing that sample for iodine removal efficiency.
Detailed guidance on the requirements and criteria for the filter testing is provided in Regulatory Guide 1.52, " Design, Testing and Maintenance Criteria for Atmosphere Cleanup System Air Filtration and Adsorption Units of Li ht-Water-Cooled Nuclear Power Plants."
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3.0 REFERENCES
3.1 Regulatory Guide 1.52 3.2 ORNL-NSIC-65, " Design, Construction and Testing of High-0 Efficiency Air Filtration Systems.
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3.3 ANSI-N510 of 1975 s
1687
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Revision 0 01/28/76 3.4 HPP 1618, " Shipment of Radioactive Material, DOT Regulations" 4.0 EOUIPMENT 4.1 Replacement adsorber tray (Qualified to Reg. Guide 1.52, except where specific variance has been issued).
4.2 Large Yellow Poly Bags 4.3 Sheet polyethylene 5.0 PROCEDURE 5.1 Submit a work request to the Maintenance Department for removal of the charcoal filters in accordance with this procedure.
5.2 flotify the Control Room of the intent to enter the filter bank.
NOTE:
Air flow thru the filter should be secured and appropriate fans tagged prior to entry.
All personnel must comply with protective clothing and respiratory protection requirements of the appropriate Radiation Work Permit.
E.3 Enter the filter bank on the downstream side of the charcoal adsorber filters.
5.4 Each adsorber tray is held in place by two metal strips bolted to the frame.
Remove the 3 nuts on both the upper and lower metal strip of the tray to be tested and remove the metal strips.
5.5 Remove the tray from the bank.
fiOTE:
Careful handling of the filter which has been in service is required due to the potential for contami-nation on the tray.
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Revision 0 01/28/76 5.6 Place the tray, face first, into a large poly bag.
(Face of the tray is the side with the handles.)
5.7 Insert the replacement tray into the open space of the filter bank.
5.8 Replace the metal strips and nuts, and tighten the nuts securely.
5.9 Exit the filter bank with the tray to be tested and notify the Control Room that the filter bank has been vacated.
If0TE:
Freon testing o' the adsorber bank or affected section will be necessary in accordance with section 3.15 of the Technical Specifications.
5.10 Take the used filter tray to the area specified by Radiation Protection or Chemistry Supervision.
fiOTE:
All further steps, hall be performed on polyethylene sheets to catch all spillage of charcoal.
Respiratory protection and protective clothing as specified by Radiation Protection Supervision is required for personnel performing the sampling of the charcoal tray.
5.11 Stanc the filter on its face, open end of the poly bag up, on poly fheets.
5.12 The bick of the tray is sealed with 4 metal plates, pop-rivetad to the tray.
Two plates must be removed.
fiOTE:
The two plates which will be removed must be on the same side of the large separation, i.e., both upper plates or both lower plates.
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5.13 Drill out the pop-rivets which hold 2 of the plates, and remove the 2 plates.
J 3.0
1687 Revision 0 01/28/76 NOTE:
If the tray selected has a bolted rather than welded face plate, the tray should be placed in the bag face-up and the face plate unbolted.
Continue as in Step 5.13.
5.14 Place a second poly bag over the tray and the first poly bag.
5.15 Carefully turn the tray and poly bags over so that the charcoal spills into the cuter poly bag.
Shake the tray to insure all the charcoal has been emptied from the tray.
5.16 Remove the tray and inner bag from the outer bag, carefully turning the tray over to keep the open end of the bag up.
5.17 Seal the bag with tape, sealing the tray in the poly baa.
The tray will be refilled or disposed of as solid rad waste.
5.18 Take the bag containing the charcoal and, holding the top tightly closed, mix the charcoal by gently shaking the bag.
NOTE:
Insure compliance with respiratory protection as specified by Radiation Protection Supervision.
5.19 Carefully pour the charcoal onto an approximately 3 f t. square plastic sheet.
5.20 Form a pile by pulling up on the corners of the sheet.
5.21 Quarter the pile and discard, into the bag, two opposite corners.
5.22 Repeat steps 5.19 and 5.20 two times.
5.23 From the remaining charcoal, take random scoopings and fill a one pint plastic sample bottle; label appropriately (include date, time, tray number, tray location, and sampler's name).
5.24 Seal the bottle and place it into a plastic bag which will be sent to an off-site vendor for testing.
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1687 Revision 0 01/28/76 5.25 The charcoal not used will be disposed of as solid rad waste.
5.26 Survey and package the sample as per HPP 1618.
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