ML19261F022
| ML19261F022 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/09/1972 |
| From: | Harold Denton US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910180635 | |
| Download: ML19261F022 (3) | |
Text
.-
pjG 9 13M R.
C.
DeYoung, Assistant Director for PWR's, L HYDROGEN PURGE DOSE CALCULATIONS FOR THREE MILE ISLAND UNIT 1 (TMI-1)
P LANT N AME :
Three Mile Island 1 LICENSING STAGE:
OL DOCKET NUMBER:
50-289 RESPONSIBLE BRANCH:
PWR #2 PORJECT LEADFA:
H.
E.
Schierling REQUESIZD COMPLETION DATE:
N/S APPLICANTS RESPONSE DATE NECESSARY FOR NEXT ACTION:
N/S DESCRIPTION OF RESPONSE:
N/S REVIEW STATUS:
N/S On July 31, 1971, Denwood Ross documented his subject dose calculations and concluded that the Met-Ed purge doses are less than 10% of Part 100 guidelines.
On July 24, 1972, H.
Faulkner infornally sent us a copy of the safety evaluation of the TMI-l combustible gas control system, dated July 19, 1972.
The safety evaluation states that the hydrogen (H ) Purge whole body dose is about 4 rem, 2
which should be verified by Site Analysis Branch.
Our verification concludes that purging for 45 days will result in a whole body of 1.64 rem and a thyroid dosa of 1.50 ram.
Purging for longer times will not affect the thyroid dose, as the I-131 has decayed sufficiently to be non-contributive to the dose.
However, the whole body dose will be affected by longer purge times singe the Kr-85 source strength is essentially constant during these time periods.
If purge continues for greater than about 70 days, the whole body dose will exceed 101 of Part 100 criteria.
Tne details supporting our conclusions are enclosed.
A purge rate lower than 15 cfm will reduce the calculated dores.
Odgnd steed by
.H. R. Denton Harold R.
Denton, Assistant Director for Site Safety Directorate of Licensing
Enclosure:
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Iniel, L W.
P. Gammill, L H.
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Schierling, L G.
Lainas, L R.
Smith, L DISTRIBUTION:
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THREE MILE ISLAND HYDROGEN PURGE DOSE Assumptions:
1.
Equilibrium fission product inventory for 2535 MWt power level, except Kr-85 which is casen at 5 years operation.
2.
1/4 available to montainment air (TID-14844) For I-131 3.
Purge starts 30 days following the sccident 4.
1/100 available after spray reduction (computer Dose Reduction Factor) 5.
Purge rate is 15cfm C, ore Inventories at t=0 (time of the accident)6 Kr-85 620 curies /MWt X2535MWt 1.57x10 curies
=
8 Xe-133 54,000 curies /MWt X2535MWt 1,37x10 curies
=
7 Xe-131 25,100 curies /MWt X2535MWt 6.36x10 curies
=
Core Inventories at t=30 days 6
Kr-85 (1.57x10 curies) 8
.6 3 6
Xe-133 (1.37x10 curies) (e 3) 2.74x10 curies
=
5 Eh )
1.18x10' curies 7
.693 I-131 (6.36x10 curias)(e
=
(4) (100)
Dose models:
Whole-body D=.255 (X/Q) QF Thyroid D=QC3 (X/Q)f D is the dose rate from infinite cloud (rem /sec)
E is the average decay energy from USAECAAR (X/Q) is from Safety Guide 4 for 4-30 days and 910 meters Q is (core inventory)
C is dose conversion from TID-14844 3 is long-term b reathing rate from Safety Guide 4 f is fraction gettir; through charcoal filters F is fractional core release rate; i.e.
15cfm 2x100Cf 1486 103