ML19220A901

Discusses PSAR Treatment of Iodine Removal Thyroid Dose During Loca.Mods Under Consideration Include Recirculating Filter Sys & Reducing Design Basis Leak Rate

ML19220A901
Person / Time
Site:	Crane
Issue date:	04/28/1969
From:	Howe P US ATOMIC ENERGY COMMISSION (AEC)
To:	Boyd R US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7904250077
Download: ML19220A901 (1)

Text

AOP 2 E3

3. S. Ibyd, Assistant Directer for Reactar Projecta, DEL THRU:

S. Levine, Assistant Directer for Reactor Technolocr, ERL PE'tEIAKr SAFET! ADLY3IS.N - wa MILE ISLAND UNT! 2 - DCCKZT NO. 50-320 In reviewing the ??.AR for the Three Mile Tc1a,ri plant ve have applied cur a+mMn-d =cdel in calculating the exclusion rMins thyroid dose resulting from the loss-of-coolant accident.

<*me-the DiI,@ cont 24mnt air recir-culation cooling system is not equipped with HEPA filters, ve have assuned a total of 15% of the avail shle iodines are in a non-removable form (lQ1 organies a:xi 54 particulates). The calculated thyroid dose is 45 Rem duri=g the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> post-accident period. If a E2PA filtering system vere ine:ded, the dose veuld be reduced to 380 Rea, a value still in excess of the rPa'ims of 1CC721DO.

"Se applicant has specified that if FAD progress currently underway do not substantiate adequate spray re=cral effectivemss, a recirculating filter system can be insta11M to reduce the availah'a iodines; the contain=ent spray system can be redesig=ed for greater effectivecess; or the cen'*4"

• "t design basis leak rate can be reduced. Our e*le"1 stions 1.:x11cate that a total reduction factcr of 5 2 or greater is 2: ceded to bring the calculated dose within Part 100 er43-14-s.

I suggest we have an "in-hcuse* meting ca this matter azzi decide hev ve va::t to handle it.

P. W. D:nre, Chief Envirc w Lt.al is Paliation Safety RT-371A Technology Branch IEL:Z*=RST3:VT5 Divisicu of Reactcr Licensing ec:

F. Schreeder R. Tedesco R. Povell DISSII.L'" ION:

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