ML102030325
| ML102030325 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, McGuire  |
| Issue date: | 06/09/2010 |
| From: | - No Known Affiliation |
| To: | Office of Information Services |
| References | |
| FOIA/PA-2010-0209 | |
| Download: ML102030325 (6) | |
Text
Response From McGuire Nuclear Station /
ONSITE GROUND/SURFACE WATER MONITORING QUESTIONNAIRE Onsite Radiological Effluent/REMP Monitoring Program Phase I (Near Term Response)
Yes No
- 1. Does the licensee have radioactive groundwater monitoring wells onsite? [K El If YES:, I-ow many wells: McGuire has eight (8) onsite groundwater monitoring wells.
See Note 1.
Where are they located (e.g., distributed around/throughout the site, in a particular region of the site andlor near particular buildings/structures, etc.)
within the Protected Area 0 El (blj within the Radiologically Restricted Area 11 within the owner-controlled area 21 El at what frequency does the licensee sample/analyze the wells Groundwater (cj monitoring wells are sampled and analyzed quarterly.
For what radionuclides does the licensee monitor Gamma emitters (Gamma Spec) 0J E If Yes - at what MDA See below.
Tritium [R] E If Yes - at what MDA See below.
Gross Beta MR S If Yes.- at what MDA See below.
Other:
[] r[
If Yes - at what MDA Typical Minimum Detectable Nuclide Activity (MDA) 0pCi/1)
Gross Beta 4 Tritium 250 Mn-54 6 Fe-59 17 Co-58, Co-60 9 Zn-65 4 Zr-95 8 Nb-95 1-131 6 Cs-1 34 6 Cs-1 37 9 Ba/La-140 11 A
Response From McGuire Nuclear Station Yes No
- 2. If the: licensee does NOT have an onsite radioactive groundwater monito pig program:
.(a) Does the licensee plan to implement a groundwater El El monitoring program?
If Yes, when and to what extent:
(b.) Does the licensee plan to'take other measures to assure they El E]
can identify radioactive groundwate contamination?
- 3. Does the, licensee have a french drain system surrounding the main reactoi ,.facility and auxiliary structures?
(a, is the system analyzed for radionuclides?
(bj4 at what frequency does the licensee sample/analyze the well S McGuire has a Ground Water Drainage System (Wa Svstem).
This system collects the groundwater drainage from under the site and channels it into the WZ sumps. The effluent from these sumps is composited and analyzed monthly. 5,t- A_7,c/,'?o/r
(~) for what radionuclides does the licensee monitor Gamma emitters (Gamma Spec) -. E[ El If Yes - at what MDA See below.
Tritium [] El If Yes - at what MDA See below.
Gross Beta El []
If Yes - at what MDA
Response From McGuire Nuclear Station Typical Minimum Detectable Nuclide Activity (MDA) (pCi/I)
Tritium 250 Mn-54 16 Fe-59 37 Co-58, Co-60 50 Zn-65 40 112 Ak Zr-95 Nb-95 16 Mo-99 33 1-131 34 Xe-133 200 Xe-135 1,400 Cs-134 19 Cs-137 44 Ba/La-140 31 Ce-141 49 Ce-144 250
- 4. Doesýthe licensee have a surveillance prograrn to periodically: Yes No (a) walkdown outside areas around the site to look for potential leaks and spills? 0 LI (b) pressurize buried radwaste lines to evaluate structural integrty and evaluate potential for leaksand spills? LI 0]
- 5. Does the licensee perform any other onsite monitoring (e.g., soil sampling) to identify unexpected radioactive releases E0 L See Note 2.
- 6. Does the licensee's radioactive liquid discharge line traverse any non-licensee owned property (e.g., it is on a right-of-way surrounded by private I [1 properties)?
- 7. If the licensee has a discharge pipe that runs underground or any E0 El undergground piping that carries radioactive liquids, does the licensee performi monitoring along the discharge pathway to identify potential leak~age.
if YES, lHow frequently is the sampling performed: See Note 3.
Response From McGuire Nuclear Station Phase Ii ('Longer Term Response)
- 8. Historicdal Onsite Radioactive Contamination: Yes No (a)Xt Does the licensee have any history of radioactive spills and/or
- leaks outside of buildings/structures? [IX E Are they documented in 10 CFR 50.75g file? 21 Ul (b) Has the licensee identified onsite radioactive groundwater U] Ul contamination? See Note 4.
A,4 IfYes:
=:= When was it identified - If known:
Dates:
LER/Abnormal Event Report/Condition Report Nos:
(If available)
- To what extent - If known [square footage, estimated ground depth of the contamination, estimated quantity (volume /
concentration), etc.]
= Has the contamination moved outside the U1 Ul Restricted area or the owner-controlled area
- 9. Comm6nts:
Notes (1) The.,groundwater mlonitoring wells are located near the Reactor and Auxiliary Buildings andi'toward the site boundary.
(2) Infý,'quent limited onsite sampling has been perforined (i.e. soil and rain water).
(3) Ianddition, some inspection has been performed on the Liquid Waste (WL) piping from 11the6,olidification Pad to the Radwaste Facility. This is documented in PH s M-05-0558
- adndi 4 06-0129.
(4) Tritittn is a naturally occurring radioactive isotope ofihydrogen. It has the same che1iical properties as hydrogen so it exists primarily in the form of water or water vapor in t$c air. When present in the environment, it does not pose an external radiation hazard butiJs an internal hazard because it can be ingested or inhaled. However, due to its low-eneigy beta particle and its quick clearance friom the body, it must be ingested in very larr, quantities to pose any significant health risk.
A.
Response From McGuire Nuclear Station "Conitamination" is not defined herein. For tritium, the relevant standard is typically the 400FR141 Maximum Contaminant Level (MCL) of 20,000 pC/l, which has been widely cstAbhished as a level of consumption considered protective of human health, and would equate to a radiation dose of 4 mrem if an individual were to drink /g gallon of the water cvyy day for a year. The radiation dose limit of4 mrem is equivalent to about half of the dpe received from a chest x-ray. Assuming "contamination" exists only when the MCL di*'6issed above is exceeded, McGuire has not "identified onsite radioactive groundwater contamination". McGuire has, however, detected tritium in the groundwater onsite. The leviels at which tritium has been detected has always been below the MCL. However, for purposes of completeness, each of the instances is described below.
Tritium was identified in the Ground Water (WZ) sump on June 26, 2003. This was identified in PIP M-03-2828. The tritium concentration in the WZ sump was 3.563 E-06 pCi/mil (3,563 pCi/I.) Following steps to arrest potential leakage, the concentration has trended down and current levels are about 1.3E-6 uCi/mI (1300 pCi/L). Monitoring is on-going. Tritium was also identified by sampling the groundwater near the Conventional Waste Water TrcatmentlSystem (WC System) hold-up ponds on June 17, 2004. This was documented in PIP M-04-3183. Tritium has been detected in the groundwater near the WC pond with a range of 4.93 E-06 to 6.OOE-06 ýtCi/ml (4,930 to 6,000 pCi/1). Monitoring is on-going. We have is no indication that tritium has moved outside the owner-controlled area.
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03/17/2006 FRI *3.:07 FAX 7043823797 DUKE POWER 002 I1j DF: \FT -FOR DICUSSION PURPOSES ONLY Attachment to:
fOnsite Ground Surface Water Monitoring Questionnaire Fol Iow-Up Questions from the NRC Where is the Groundwater I)rainage System (WZ System) addressed in the LYSFAR. and wvhat is the system's purpos,?
The WZ system is ;ddressed in UFSAR 9.5.8. The Groundwater Drainage SyStem consists .of Lhree sumps located in the Auxiliary Building. It is designed to relieve hydrostalkc pressure from the Reactor and Auxiliary Buildings by discharging ground rater collected in sumps to either the yard drains or the Turbine Building s,. raps.
Paragraph 3 of Note 4 of Ni1, Guire Nuclear Station's response to the above questionnaire identifies groundwater sanpdes in which tritium was identified. Were other radionuclide Rdentified in the referenced ;amples?
"(No.
iWhat is the, background tri Iium. level in Lake Norman'?
.The background triti . In concentration in Lake Norman is assumed to be less than the
. detection capability c f2-5E-7 iCin-l (250 pCi/1).
Whatiiirc the average tritit 'nlevels detected in Lake Norman and downstream from the plantii 2005?
Tris information ca, i be found in McGuire's Annual Radiological Environmental Operating report.
.The average tritium , :-ncentration at sample location 101 (North Mecklenburg drinking (Gwaterplant on Lake '4orman) in 2005 was approximately SE-7uCi/nil. (800 pCi/l) The Zaverage tritium- cone, ntration at sample location 132 (Charlotte drinking-water plant on Mountain Island Lak0,) in 2005 was approximately SE-7 uCi/ml. (500 pCi/1)