ML20071F446

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Procedure HPA-77, Determination of Max Permissible Concentration Hours
ML20071F446
Person / Time
Site: Peach Bottom, Limerick, 05000000
Issue date: 05/16/1983
From:
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20071F431 List:
References
HPA-77, NUDOCS 8305180443
Download: ML20071F446 (5)
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PHILADELPilIA ELECTRIC COMPANY PEACH-BOTTOM UNITS 2 AND 3 HPA DETERMINATION OF MPC HOURS PURPOSE:

This procedure provides the method of determining MPC hours for an RWP.

1

REFERENCES:

HPA-72 HPA-73 HPA-74 HP0/CO-3 APPARATUS-None PROCEDURE:

1. Obtain an air sample which is representive of the air being breathed during the job per HP0/CO-3.
2. Determine the gross 6 activity of the air sample per HP0/CO-3. If the gross 6 activity is)P 3N10.pCi/cc, an isotopic analysis or half life determination for air samples which have isotopes with half lives 3$ 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> (if half life )> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, an isotopic analysis must be done) shall bo performed per HP0/CO-3. Anytime a charcoal cartridge is used to detect iodine, the cartridge shall be analyzed isotopically. (This may be done using the Iodine 131 single channel analyzer.)
3. Using the isotopic analysis of the particulate filter (and charcoal cartridge if iodine determination is required) complete the MPC hours calculation sheet -

Data Sheet HPA-77-1. This may be done by using the MPC program on the multichannel analyzer in the place of Data Sheet HPA-77-1.

4. If Noble gases or Isotopes with half livesj$ 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> are detected, no MPC hour calculations are required on these isotopes.
5. If additional isotopes are identified (other than noble gases or isotopes with half lives dC 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />) which are not listed on Data Sheet HPA-77-1[~~ add these isotopes to the data sheet and determine the MPC from 10CFR20.103 Appendix B, Tabic I, Column 1 (for air). Use the most restrictive MPC between the soluble and insoluble forms.

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PROCEDURE: (continued)

6. Determine the MPC fraction, Concentration in Air (uCi/cc) MPC (uCi/cc), for each isotope identified. Sum up the MPC fraction for the particulates and iodines identified.

7 Determine the stay time required for 2 MPC hours for the type of Respiratory Protection being used. If this is an initial' survey or if the type of Respiratory Protection is not known, calculate the stay time for 2 MPC hours for a standard mask (ppt. filter or Iodine Cart.) and an air line mask. This calculation may be done by the MPC program on the multi channel analyzer in the place of Data Sheet HPA-77-1. If no mask is being used, the Respiratory Protection factor (RPF) for Iodines or particulates is 1.0.

STAY TIME , ,

2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> for 2 MPC Hours (I of ppo. MPC fraction X RPF ppt) + ( E of I2 MPC fraction X RPFI2 )

RPF ppt = Respiratory Protection Factors for Particulates (see Data Sheet HPA-77-1)

RPFI2 = Respiratory Protection Factors for Iodines (see Data Sheet HPA-77-1)

8. The stay time calculation sheet (computer printout or Data Sheet HPA-77-1) shall be attached to the Gamma Scan for each RWP air analysis, if the air activity is Jr l.ON9 uC1/cc (Gross Beta or I131).

9 Work Sheet HPA-77-2 shall be completed within the next work day if all of l the following apply:

a. Air activities are > 1.ON9 uCi/cc (Gross Beta or I131).
b. Stay time for 2 NPC hours is less than 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
c. Someone worked more hours than the allowed staytime for l 2 MPC hours , based upon respirator vorn and qualification of individual.
10. Work Sheet HPA-77-2 will be completed using data from either HPA-77-1 or the computer printout. Data vill be listed in the appropriate columns.
11. A technician (responsible ,for handling MPC hours) will check each person's respiratory record to determine if they are qualified to receive a protection factor for the equipment worn. A check mark should be placed in the appropriate column.
12. If the individual is qualified multiply the data in the column "MPC Factor (mask vorn)" by the " number of hours in area" column. Post the resultant MFC hours in the work area eclumn.

13 If the individual is not qualified multiply the data in the column "MPC Factor (no mask)" by the " number of hours in area" column. Post the resultant MPC hours in the work area column.

ANY JOB WHERE A PERSON RECEIVES OR COULD RECEIVE MORE THAN 40 MPC HOURS / DAY OR/

SHIFT REQUIRES IMMEDIATE NOTIFICATION OF HP SUPERVISION.

lb. If any individual has accumulated more than 2 MPC's complete a Dosimetry Sheet HPA-77-3 and deliver to the dosimetry office for adding to the computer system.

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