ML20037B217
| ML20037B217 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 11/29/1972 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Butterfield L COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8009080607 | |
| Download: ML20037B217 (2) | |
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i-Co. int <ealth Edison Company
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L. D. Butterfielti- ^*
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%1.ar racensing Administmtor Fost Office do.s 767 Chicac;o Illinois 60690 Gentle. Ten :
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Your letter dated July 10, 1972, transmitted your analysie of tho'.
consequences of hydrogen production following the loss-of-emlant 4=
accident, IDOA, for the Dresden Nuclear Power Str. tion Unit ?~o.1 l
Facility License No. D E-2.
Your anab'31s was subnitted in response to our letter dated July i
22, 1971, tion conceming Chnnre :io.17 to the 'IbcWeal Srectesting additional infoma-Welficatiens of the facility.
Based uoon your analysis, you concluded thst there' $3 no hamrd fma hydrogen followins the IDCA and themfem no require-rent for either a hydregn detection system or hydro?.en contml i
systen for Dmaden Lhit No. 3.
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L'e have Inviewed your ana~ ysis and have determined that, with
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rixing, the hydrogen concentmtion in the Dresden Unit ib.1. can-Eood j ~.
taiment following the IOCA would not exceed the limit'of 4 volunc percent for hydrogen as specified in our Safety Guide i;o. -7. _ You"
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nlysis did not include any hydrean contribution Tzum possible alm:inum corInsion or a discussion of your bcsis for not including
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such contributions.
However, the mrgin betueen the calculatec hydroren cmcentmtion using Safety Guide !!c. 7 assu=tiom (les, then 2 volum rercent) rnd the specified hydroyn cmcentmtien
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"" c-Jety Guide r?o. 7 (4 voltre nercent) is consid red ade; tate to accotnt for any possible contributions frm aluminum emr.cion in the Dresden Unit No.1 containient follo'adnr the acciant.
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Based upon our review and c:r. lysis of the Pgdrogen p::rduction j
following the IDCA, we conclude that a hydrx> gen control system is not required for Dresden Unit No. 1.
We further ocnclude that the en?hility for neasuring the 4droEen concentration and for Ir.1xing the atmosphere in the contmient following a IOCA should be provided.
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'Ihis capability is considered necessary to assure that hydrogen con-centration 1e unifom throughout the corfdment volume and that the hydrogen concentration can be detemined following an accident.
You are requested to sub=it your plans for incorporating the necessary equipment for r-hing the containrmmt atmosphere and for nresuring the hydrogen concentration in the ccntainment of the Dresden Unit No.1 within 90 days frtxa the date of this letter.
Sincerely, t-Donald J. Skovholt Assistart Director for Operathig Reactons Directorate of Licensing cc: John W. Rowe, F. squire t
Isham, Lincoln & Beale i
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Chicago, Il inois 60690
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