ML20037B075
| ML20037B075 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/17/1964 |
| From: | Bower D COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20037B072 | List: |
| References | |
| NUDOCS 8009030789 | |
| Download: ML20037B075 (4) | |
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Proposed Revision to Technical Specification cf bresden Nuc? ear Power -tation Commonwealth Edison Company August 17, 964 Pursuant o paragraph 3-a(4) of License DPR-2., as amended, fe r t he Dresden-Nuclear Power Stati 41, Commonwealth Edison Cot..pany reoues.ts that Appendix A to License DPR-2 be amended by deleting items 8.c.
" Airborne Mastes" and 8.d. " General" and substituting taerefor the Jo11owing:
c.
Airborne Nastes Radioactive airborne wastes are discharged from a 300-f ot-high stack.
There are continuous-nonitoring systems fe c the total stack flow and the air-ejector flow.
A hoidup.
~ ime is provided it both the gland seal exhaust system t
and the air-ejector exhaust system.
The air-ejector monitoring-system autonatically initiates closing of the discharge valve on the air-ejector system if the radio-active material flow rate in the air-ejector system reachas i" ' ' ! D, a radiogas level that wonid correspond to the maximum per-N missib1'e stack release rate if flow continued for a ceriod q
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longer than the holdup time provided between coint o'f
,[tf egggs tg monitoring in the :.ir-ejector system and discharge to the yvfA y
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The maximum permissible stack release rate for f:.ssion X
and activation gases shall be 10 curies per-second.
When-u 4r l's ever the average stack release rate for any we'ek shall have g[{,
exceeded 0.7 curies per second, then steps designed to lower the average release rate for subsecuent weeks to not'more than 0.7 curies per second shall be taken.
Notwithstanding the foregoing, in any consecutive four Calendar Quarters (as defined in 10 CFR Part 20) the resulting annual aversge stack release rate for fission and activation gases shall not exceed 0.7 curies per second.
The annual average stack release rate for halogens and particulate matter (expressed in units of microcuries per second) shall not exceed the permissible air con-centrationsforunrestrictedareas,asgivenin10..C{g;203 as effec.tive January 1, 1961, multiplied by 1.2 x_10
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seccnd.
Iodine and particulate. stack samplers.shall be replaced and appropriately analyzed at least weekiv.
Stack release rates for halogens and particulate ca.tter shall be based on these analyses, which shall be nerformed not sooner than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, nor later than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after sampler removal."
The technical basis for this proposed change is discussed in E'xhibit B.
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Technical Basis For Proposed Revision r'
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Technical Soecification NR c-g C07 h, V
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Dresden Nuclear Pouer Station Commonwealth Edison Company-O p;.
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Text Renlaced M I 's \\
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The urovisicus of item S.c. "',irborne. Mastes" which.would be changed or replaced are as follows:
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"The air-ejector moniter automatically initiates closing of the discharge vr.1ve on the air-ejector holdyp system if the measured rate of discharge of exceeds 2 x if uc per second, the measurements Xc13e biing made after two minutes decay (travel tir.c in the system froc the reactor core to point of measure-ment).
The reacter till be.anually shutdown when
- ne stack dischar,c rate of noble fission gr.ses exceeds 7 x 103 uc por second."
Isotones.!c nit o re d
-' narience has indicated the P
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- r 3ress grra activity -
from the radiogases with eithe r a scintillation counter or an ion chamber urovides a rore reliable acnitoring method than keeping a sin;1e Jaannel counter proper.e in adj:stment to monitor only a l
single isotope such as Xc 33 Monitoring Decay Time The specific mention of "two ninutes decay" has-been removed as the statement is in fact inaccurata.
The two actual sampling points are so=c 24 feet and 38 feet from the air-ej ector end of the nominal twenty-minute holdup decay pipe. 'Taus they sample early.in the decay period but not necessarily at precisely two minutes, as system flow varies somewhat from time to time principally as a result of varying plant power level.
Reworded Radious Emission Limits The rewording of thc stack .mits for radiogases of 0.7 and 10 curies per second is patterned after technical specifications for other plants such'as Big Rock Point ind Humboldt 3ay which had the. advantage of several additional years c:nerience, and more detailed discussions ietween applicants and the AEC staff.
Tne rewording recognites that pg m g m
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,.v EXilIBIT B Reworded Radiocas Enission Limits (continued) the 0.7 curie per second limit was_inteaded to be the pernissible' annual average emission rate, as is the case in the core recently approved technical specifications for the other plants referred to.
Emission Limits for Other Radiomaterials The Dresden. technical specification was silent on specific emission limits and monitoring reo.uirenants for radioactive ma,terials other than the radiogases, although gernissible levels for all radioactive materials at any off-plant point of_cxposure.to persons is covered by Technical Specification c. ar;qra,h 3.d. 'G.'neral"s which states:
"Connonwealth Edisci. shall r.o
--
- se into air any concentration of radioacti'.a material which will result
.: exposure to concentraticns at ground'. levels in any unrestricted area an thct t erm is defined in 10 CFR Part 20 in excess of the limits specified in Appendix B, Table II of 10 CFR Dart 20.
For ourcoses of this-limitation concentrntions ray be 've' raged over periods a
not greater than one year."
Thc proposad change corrects tTis :cission of stack limits making use of the same wording to covar the sub.iect as is used.in Big Rock Point technical specificaticn i ea 4.3,l.
The 3ig Rock Point dilution flow of 1.2_x 10 "
c/sec
- ch a nominal stack flow of 30,000 cfm (1.4 x 10/ cc/sec) r2cognizas a stack to ground dilution factor of about 85.0, and as s'. O is proba'aly -conservative by several orders of magnitude when aver:ged over the calendar year asspecifiedin10CF}020.
To find the appropriate dilution flow for Dresden (1.2 x 10 cc/sec) on this same very conservative basis, the following change factors were applied:
a)
Multiply by a factor of 0.7 recognizing that the Dresden radiogas emission limit is 0.7 curic/sec while Big Rock Point is I curie /sec.
b)
Multiply by a factor of (300)2 --(256)2, which is about 1.4, recognizing that the Dresden stack height is 300 feet, while Big Rock Point is 256 feet, and that maximum downwind concentrations are approxi-mately inversely proportional to the squares of the heights.
The proposed chanje also speci fically calls for appropriate monitor-ing of stack air for halogens and particulates.
The period of sample collection and time for counting or other means of analysis is the same as is currently sy:cified for the other plants.
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