ML20037B598

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Notifies That Special Rept 36, Description & Analysis of Unit 1 Modified Offgas Treatment Sys, Dtd 740305,is Acceptable.Hydrogen Explosions in Offgas Sys Should Be Anticipated Occurrences.Safety Evaluation Encl
ML20037B598
Person / Time
Site: Dresden 
Issue date: 12/02/1974
From: Goller K
US ATOMIC ENERGY COMMISSION (AEC)
To: Abel J
COMMONWEALTH EDISON CO.
Shared Package
ML20037B599 List:
References
NUDOCS 8010220719
Download: ML20037B598 (2)


Text

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DISTRIBUTION Docket File P0'Connor AEC PDR RSilver ng:

ORB #2 Reading DLZiemann OGC SKAri R0 (3)

WOMiller et 4;. 50--10 liDube.

BScharf (15)

BJones (4)

TJCarter RVollmer PCollins JSalt==an SVarga Co=wnwealth dison Company 1.

RMDiggs CHebcon ATm:

Mr. J. S. Abel RSchemet Euclear Licensing Meinf atrator -

ACRS (16)

Boiling Water Reactors.

HJMcAlduff,0RO Post Office cox 767 JRBuchanan, ORNL Chicago, Illinois 60690 TBAbernathy, DTIE Gentlemen:

We have reviewed Dresden Special Report 35, ' Description and imalysis of the Dresden hit 11;odified Off-Gas Treatment Systec," subnitted with your letter of March 5,1974, and have determined that the

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off-gas system described in that report is acceptable. A copy of a

our Safety Evaluation of the system is enclosed.

It is our opinion, however, that hydrogen explosions in off-Eas syste=s occur frequently enough to be considered anticipated operational occurrences and the consequential releases of radioactivity must be naintained as low as practicable. In this regard we believe, based on the infor::ation sub=itted, that it would be prudent to add to the rupture disk vent a t.eans to prevent continued release of radioactivity following rupture of the rupture disk. Please advisc us within 60 days of this letter of your plan regarding the isolation of the vent line.

We also request that you sub=it, no later than 90 days prior to initial operation of the augmented off-gas system, your proposed technical specification for its operation.

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Sincerely, D.&'

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Coller, Lscistar.t Director for Operating "cactora Directorate of Licensing incitsure.

Safety Evaluction ec-see next page L:0RB #2. M L\\ RB #2/

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