ML19352B127
| ML19352B127 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/29/1981 |
| From: | Hovey G GENERAL PUBLIC UTILITIES CORP. |
| To: | Barrett L Office of Nuclear Reactor Regulation |
| References | |
| LL2-81-0149, LL2-81-149, NUDOCS 8106030185 | |
| Download: ML19352B127 (2) | |
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GPU Nucles-luClear Ld!L Middletown, Pennsylvania 17o57 717 948-800o TELEX 842-386 G
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E May 29, 1981 F
LL2-81-0149 2E e
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$E TMI Program Office y
Attn: Mr. Lake Barrett, Deputy Director u
y U.S. Nuclear Regulatory Commission c/o Three Mile Island Nuclear Station Middletown, Pennsylvania 17057 4s no N
Dear Sir:
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Three Mile Island Nuclear Station, Unit 2 (TMI-2)'!tJUN 0 21981>b, i-Si Operations License No. DPR-73
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Docket No. 50-320 g v.s. = w uouuross Submerged Demineralizer System U
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I,8 During discussions with members of your staff you have requested tha
-y provide you with the following additional information:
" Provide the NRC staff with the limits you expect to be used for processed water to be stored on site, i.e., processed water polished and stored on site until a decision for disposal has been made."
l Our letter LL2-81-0138 addresses the PWST storage limits based on the PWST rupture analysis as presented in the PEIS and direct radiation exposures from i
the tanks.
As you are an.are the EPICOR II System will be used to polish the effluent from the SDS System during normal operation. When these two systems are used in series, the final effluent from EPICOR is expected to meet the below listed effluent concentration quality:
Isotope Concentration (uci/ml)
Sr 89 lE-8 o(
l Sr 90 lE-5 go I
Nb 95 1E-6 p4 h I
Ru 103
<1E-6 Ru 106 lE-5 i
Sb 125-lE-5 Cs 134 3E-6 Cs 137 2E-5 Ce 144 lE-5
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Lake Barrett i These effluent predictions are based on the Spring 1981 Reactor Building sump sample results, EPICOR II processing experience, and the column tests performed at TMI with actu'al Reactor Building Sump Water.
While GPU i.ntends to polish SDS effluent through EPICOR II during normal operations, this may not always be the case. When specific uses for unpolished SDS effluent arise, GPU intends to bypass the EPICOR II System. We have currently identified several such uses. These are:
1.
Reflood of the Reactor Building. GPU may choose to reflood the Reactor Building, using unpolished SDS effluent, after the majority of the. water has been processed from the sump. This will reduce the potential for airborne contamination in the Reactor Building until the removal of the sludge.
2.
Gross decontamination - Gross spray down of the Reactor Buf1 ding surfaces, will not require fully polished water, should this decontamination option be chosen.
3.
RCS processing via feed and bleed - The RCS System will be processed through SDS in a feed and bleed mode.
In this mode, full polishing to remove Ce 144 and Sb 125 would generate large volumes of unnecessary waste due to removal of sodium in the polishing system and the need to add sodium prior to reinjection in the RCS System. The SDS will reduce cesium and strontium concentrations, thereby reducing personnel exposure.
l Sin erely, l
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. Hovey Vice President, Director Unit 2 GKH: LJ L:1h cc:
B. J. Snyder, Program Director - TMI Program Office l
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