ML20041D519

Responds to NRC 820106 Ltr Transmitting IE Insp Repts 50-266/81-24 & 50-301/81-25,requesting That Info in Util 800416 Ltr Be Updated Re Investigation for Sources of Tritiated Water in Groundwater

ML20041D519
Person / Time
Site:	Point Beach
Issue date:	02/08/1982
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20041D510	List: ML20041D519
References
NUDOCS 8203050377
Download: ML20041D519 (31)

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Wisconsin Electnc rom couem 231 W. MICHIGAN, P.O. BOX 2046, MILWAUKEE, WI $3201 February 8, 1982 Mr. J. G. Keppler, Regional Director Office of Inspection and Enforcement, Region III U. S. NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

DOCKET NOS. 50-266 AND 50-301 INVESTIGATION FOR COURCES OF TRITIATED WATER POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 This is in response to your letter dated January 6, 1982, which transmitted Inspection Report Nos. 50-266/81-24 and 50-301/81-25 and requested that we update the information contained in our letter of April 16, 1980 regarding the identification and correction of sources of low levels of tritiated water in the groundwater runoff drains at Point Beach Nuclear Plant. As noted in our previous letter, the observed trace quantities of tritium in water samples taken from the subsoil drainage system at Point Beach Nuclear Plant were well below the maximum permis-sible concentration (MPC) level to unrestricted areas permitted by 10 CFR Part 20; they have continued to remain lower than MPC by several orders of magnitude and have generally remained steady or decreased slightly from previously reported levels.

A. SAMPLING LOCATIONS AND ANALYTICAL MEASUREMENTS There are two categories of samples that relate to our program for identifying the sources of tritiated water:

(1) General Plant Sampling These are samples taken in the course of routine monitoring of the plant and its environs. The results of these samples are reviewed as part of the subject program; since the results are routinely reported elsewhere, including various reports to NRC, the detailed data are not repeated herein. There have been no significant changes in these categories, and the general levels of concentration are as follows:

8203050377 820301 PDR ADOCK 05000266 *FEB 1 1 E62 G PDR

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. ;4 L Mr. J. G. Keppler February 8, 1982 General H-3 Level Item (pci/ml)-

Well Water Nondetectable Service Water Samg as Lake

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Retention Pond Water 10 ~7

-6 Lake Michigan Water 10 ~

to 10 Secondary Side Water 10,5 Spent Fuel Pool Water 10 (2) Subsoil System Sampling Program This category includes all those locations which have been or are continuing to be sampled as part of our investigation. These locations are shown on Bechtel Drawing C-100, entitled Plant Foundation Plan and Sub-Drainage System and included herewith as Attach-ment 1. A descriptive list of campling locations is included as Attachment 2. The sampling procedure, HPTP 5, is given as Attachment 3. Gross beta, gamma spectrometry, and tritium analyses have been and are being used in the program, although the emphasis is logically on tritium analysis.

B. FLOW PATHWAYS AND ANALYTICAL DATA The shoreline drain outfalls for the plant are shown in Attachment 1 and listed in Attachment 2. They include S-1, S-2, S-3, S-6, S-7, S-8, S-9, S-10, and S-ll. Of these,.

S-2 and S-6 are not routinely sampled on the basis that sample points X and Y did not indicate any activity in the outside subsoil system. Points-S-3, S-7, S-8, S-9, S-10, and S-ll (yard drains and roof drains) would also not normally be expected to contain subsoil system originated tritium, but S-3, S-9, and S-10 were designated as sampling points to obtain tritium background in surface runoff.

Sample point S-9 usually exhibits no. flow and is not reported.

Sample points A, B, and DD are indicators of. concentrations in the subsoil system; sample point S-1 is an indicator of subsoil drainage released to Lake Michigan.. Sample points HD1 and HD2 are indicators of the anomolous concentrations of tritium observed in heater drain tank pump casings'as explained in our letter of April 16, 1980. The 1979-1981 results of regularly sampled points are presented in Attach-ment 4. A graphical representation for 1979-1981 is also given in Attachment 4.

C. SPENT FUEL POOL WORK

'Since the spent fuel pool was a logically suspect source of

.the observed tritium, much of the time since our April 16, 1980 letter has been spent.in efforts to further quantify,-

detect, and minimize leakage. Our earlier letter described

Mr. J. G. Keppler February 8, 1982 i 9

an evaporation test designed to bound leakage estimates; based.on that test, it was concluded that leakage, if any, is less than 0.5 gal /hr.

Our letter also described backfill tests of the leak chase monitoring system to determine its integrity and the feasi-bility of dye-checking liner welds via leak chase channel backfilling. Further backfill testing has been performed.

The total volume of the leak monitoring system is estimated at 430 gallons (120 gallons for the south pool system, 110 galloas for the north pool system, and 200 gallons for the transfer canal system). The points of communication between the three systems are at the divider wall notch and the pool-to-canal gates at about el. 40'. This would be reached by backfilling only.about 60 gallons. Hence, it is concluded that small leak rates in one system will not spill over and give false indications in another system.

Secondly, in view of the small measured volume, it is unlikely that a major leak would remain undetected because of losses through small cracks in the system.

A considerable amount of effort was devoted to liner plate weld testing in the south pool. This work involved the fabrication of vacuum boxes of suitable configuration for testing floor, wa.',1, floor-to-wall, and corner welds.

Initially, no leaks were found. However, after completion of efforts to find, purchase, and chemically approve a dye to enhance the sensitivity of the leak testing, further leak testing was performed using Uranine dye as backfill in the south spent fuel pool. leak chase channels. Several pinhole leaks were identified and peened shut. Subsequently, underwater welding was used to effect permanent repairs.

In October 1980, three welds were successfully completed, but the attempt to weld a difficult corner location resulted in opening up a 3/8" x 1" hole in the original liner seam.

Attempts to effect an immediate repair were not entirely successful, and leak chase channel measurements indicated-300-1,000 ml/hr. This unfortunate occurrence at least proved the credibility.of the leak chase system. An addi-tional temporary fix further slowed the leak rate to about 28 ml/hr on October 20, 1980. A plastic metal compound, Velodur, was found and submitted to irradiation testing.

Based on favorable testing; the material was successfully used to repair the leak in the spring of 1981.

A graph of measured spent fuel pool leakage is given in Attachment 5. Because of its small volume, a portion of the leakoff collected during the last half of 1981 was erroneously discarded. However, it~is estimated that i leakage during this period was less than 2 ml/hr.

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Mr. J. G. Keppler February 8, 1982 D. CONCLUSIONS AND FUTURE PROGRAM

1. Based on the various spent fuel pool tests anc the leak experience, it is unlikely that any significant amount of leakage is escaping detection.

2. The near background levels of tritium observed at the most likely outfall (S-1) contrast significantly with levels observed within the subsoil drainage system (samples A, B, and DD). These are three possible explanations:

(a) Subsoil system water was contaminated by one or more events in the past but is remaining in place and is not being removed.

(b) Subsoil system water is entering the normal groundwater flow at a low rate.

(c) Subsoil system water is moving toward the Lake independent of the overall groundwater movement.

We consider (c) to be unlikely due to the existing piping configuration, the unique separation of natural hydrological gradients that would be required, and the lack of any significant Lake sample indications. If (b) is correct, the leak is very slow; if (a) is correct, there may be no present leak.

3. We suspect the analyses of water from the heater drain tank pump casings may be anomolous due to sampling technique. We plan to make a final determination by sampling casing water directly instead of condensed steam. If the results for the pump casings are deter-mined to be erroneous, a secondary side source will be looked for and the spent fuel pool would be regarded as an unlikely source.

4. It is noted that the Point Beach Nuclear Plant spent fuel pool rests on steel piles driven through the glacial till and lake deposits overlaying the Niagara Dolomite Bedrock. The permeability of the soil and the hydraulic gradient in the area lead to extremely long liquid travel times on the order of tenths of a foot per year. Hence, any leakage from the spent fuel pool would travel extremely slowly. At the same time, the auxiliary building and the turbine building are constructed on conventional spread foundations with either compacted or granular backfill material used for replacement after excavation. Travel time in this material would be on the order of hundreds of feet per year. With a postulated spent fuel pool leak, very slow transit from the immediate pool area would be

Mr. J. G. Keppler February 8, 1982 expected, combined with very high dilution and rapid clearance beneath the turbine and auxiliary buildings.

Since this does not appear to be the case, conclusion D.2.(a), above, is reinforced.

5. Concentrations of tritium in the subsoil drain system remain well below the MPC. limits set forth in 10 CFR

20. Concentrations of tritium in drain outfalls are still lower and are barely distinguishable from normal background levels observed in Lake Michigan.

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6. In view of the recent temporary increase in spent fuel pool leakage during recent repair work, we believe the system will require a year or two to stabilize if any meaningful trends are to be observed. In addition to

completing the work activities described in item D.3, above, we will continue the current sampling program.

If you have any need to discuss these matters further, please feel free to contact Dr. Edward Lipke (414-277-2018) or Mr. James Zach (414-755-2321).

Very truly yours, ed

n C. W. Fay Assistant Vic President Attachments Copy to NRC Resident Inspector b

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ATTACHMENT 1 SUBSOIL DRAINAGE SYSTEM AND SAMPLE POINTS POINT BEACH NUCLEAR PLANT l

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ATTACHMENT 2 SUBSOIL DRAINAGE SAMPLING POINT BEACH NUCLEAR PLANT l

l SUBSOIL DRAINAGE SAMPLING POINPS Sample Designation Description Status

• S-1 Unit 2 yard drains and plant subsoil system pump (outlet) R S-2 Unit 1 outside subsoil system (outlet) 0 S-3 Unit 1 yard drains (outlet) R S-4 Unit 2 inside subsoil drains (low point) R, via sample B S-5 Unit 1 inside subsoil drains (low point) R, via sample DD S-6 Unit 2 outside subsoil system (outlet) I S-7 Unit 2 turbine building roof drain (outlet) I S-8 Unit 2 lakeside yard drain (outlet) I S-9 Unit 1 lakeside yard drain (outlet) . R S-10 Unit 1 turbine building roof Drain (outlet) R S-ll Lawn drain near Lake (outlet) O A Unit 1 facade, subsoil cleanout (sump) R B Unit 2 facade, subsoil sump R C Unit 1 facade, southwest electrical penetration O D Unit 2 tendon gallery, southeast sump O E Unit 1 turbine building, southwest sump O F Unit 1 turbine building, northwest subsoil sump O G Turbine building sump to retention pond O H Unit 1 turbine building, northwest drain sump O I Unit 2 turbine building, southwest drain sump o K Unit 2 turbine building, southwest subsoil sump o O Unit 1 tendon gallery floor near sump O P Unit 1 tendon gallery floor 180* from sump O R Unit 2 facade, southwest electrical penetration O Page 1 of 2

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Sample Designation Description Status

• U Unit 1 tendon gallery drain pipe O V Unit 2 facade, subsoil cleanout O ,

W Unit 1 facade, north subsoil '

cleanout O X Unit 1 southwest outside subsoil cleanout O Y Unit 2 northwest outside subsoil cleanout O CC Unit 1 facade, southwest subsoil cleanout R DD Unit 1 facade, suboil sump R HD1 Unit 1 heater drain tank pump casings R HD2 Unit 2 heater drain tank pump casings R 00 Unit 1 tendon gallery sump O

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• KEY: O - One-time sampling R - Regular sampling I - Inaccessible outlet beneath rocks Page 2 of 2 l

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ATTACHMENT 3 1

1 GROUNDWATER AND SUBSOIL SYSTEM SAMPLING PROCEDURE POINT BEACH NUCLEAR PLANT 1

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HPTP 5 Revision 0 f 08-14-80 HEALTH PHYSICS TRIAL PROCEDURE GROUND WATER AND SUBSOIL TRITIUM SAMPLING 1.0 PURPOSE The purpose of this procedure is to define the samples required for monitoring of ground water runoff and subsoil foundation drainage to the Lake Michigan shoreline.

2.0 REFERENCE .

Bechtel Drawing Nos. C-100, C-8, C-5.

3.0 GENERAL 1

Samples are collected monthly for analysis from four beach drains and from three sumps in the primary auxiliary building. The sumps selected are central points in the network of subsoil drains beneath the plant. Samples are also collected from the heater drain tank pump casing on both units quarterly (one casing each unit). Each sample is counted for tritium on site and saved for quarterly composite. The quarterly composites are then sent in to Hazleton for beta, gamma and tritium analysis. Point Beach and Hazleton analysis results are compiled and trending graphs are updated. On the date the samples are taken, a flow rate in gallons per day from each beach drain is also taken and filed with the analysis results.

4.0 PROCEDURE 4.1 Beach Drain Samples For beach drain samples, obtain four new one liter narrow mouth bottles, a stopwatch, and a plastic bucket with markings to indicate

• volume.

4.1.1 Three drains are sampled on the south beach; a 10", an 18" and a 24"; and one, a 25", on the north beach.

NOTE: SEE ATTACHED MAP, LABEL SAMPLES ACCORDINGLY.

4.1.2 Turn the samples into Chemistry for tritium analysis. Assign each a non-release sample number and use CHP-24. Label both j bottles and sheet with "Save for composite".

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4 4.1.3 Write a memo with all flow rate data.

NOTE: IN THE EVENT THERE IS NO FLOW, A SAMPLE SHEET.

SHOULD STILL BE FILLED OUT AND THE FLOW RATE MEMO SHOULD INDICATE "NO FLOW THIS DATE".

j 4.2 Facade Sump Samples For facade sump samples, obtain three new one-liter narrow mouth bottles, a low-volume air sampler, a 4000 m1 side arm flask (located in the Health Physics Station) and an extension cord. Set up on cart per attached drawing. The pump will be used to draw a vacuum in the bottle, allowing water to be siphoned out of the sump.

4.2.1 At each lot:ation (sample points "A", "B" and "DD" on attached map) start pump and lower tubing slowing into three-quarter inch access hole in sump cover until bottle begins to fill with water. Do not lower hose any further to avoid bringing up sand and dirt.

I 4.2.2 After obtaining one to two liters, the bottle should be shaken and poured out. Because of very low activity levels,

• 4 care should be taken to thoroughly rinse out the bottle to prevent cross contamination of samples.

4.2.3 Obtain another one to two liters and transfer to sample bottle. Repeat for other two sumps.

4.2.4 Label each sample bottle with location from the attached map. Using CHP-24, assign each a non-release sample number and turn into Chemistry. Mark the bottles and sheet with "Save for composite".

4.3 Heater Drain Tank Pump Casina Drain Samples For heater drain tank pump casing drain samples, it is necessary to sample during a pump start. The casing drains, normally three or four, are located on the pump foundation. When the pump is shut down, ground water will seep into the foundation and around the casing. After the pump is started, the hot water inside the casing will cause this ground water to flash to steam and it will vent through the casing drains. This steam has to be condensed and sampled. Normally two of three heater drain tank pumps are running.

Contact Control and coordinate a time for them to swap pumps when you desire to obtain a sample. .

4.3.1 on the pump to be started, connect a length of metal tubing to one casing drain, as per attached drawing. Plug all other drains on this pump.

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4.3.2 Place cooling coil section of metal tubing in tray filled with ice or chilled water. Paper toweling can be wetted and draped over tubing to assist cooling.

4.3.3 Obtain' two new one-qua. t collapsible cubitainers and place one under drip end of tubing.

4.3.4 Have Control swap pumps. Leave sampling equipment in place for approximately one hour after pump start, ensuring everything is working properly. .A minimum of 50 ml is preferred for a good sample.

1 4.3.5 Repeat sampling process on one pump on the other unit.

Attempt to get one sample per quarter per unit.

4.3.6 Label samples clearly as to unit and pump. Assign a nonrelease number to each sample and fill out a CHP-24 form.

Mark samples and sheet with "Save for Composite" and turn into chemistry.

4.4 Quarterly Composite of Samples

4.4.1 Chemistry will composite monthly samples and notify Health h ysics when they are ready for shipment.

4.4.2 obtain composite and do a smear check. Contamination levels should be nondetectable.

4.4.3 obtain a box or boxes le ge and sturdy enough to contain all f samples and enough absorttnt material to absorb twice the sample amount. Pack e s tes and absorbent and write up sample form to Haz N v. .lsttng all samples (use Hazleton fonn) . Evaluate t u a ee- for any other shipping papers.

4.4.4 Deliver box to frgnt ortice for shipping.

L. D. Epstein v h ui ,

C. H. Harris (APPROVED) -

bjt cc: Standard Distribution

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. S-1 -] 25" North BEACH DRAIN LOCATIONS ,

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S-9 18" South S-lO 10" South I

I S-3 24" South

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FACADE SUMP IDCATIONS iI O

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"B" I lh Unit 1 "DD" Unit 2 Containment --

Containment l EWST l l

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SAMPLING EQUIPMENT SET UP FOR SUMP SAMPLES I Attach tygon tubing

' 'kJI to flask and air sampler as shown.

Cart O O NOTE: AVOID DRAWING' WATER INTO 'IEE SAMPLER

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SAMPLING EQUIPMENT SET UP FOR HEATER DRAIN TANK PUMP SUMPS Heater Drain Tank Metal Tube Cooling Coil

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Swa'gelok Fitting ubitainer h _

Plug all other vents Tray filled with ice water or chilled water. Drape wet toweling over tube coil.

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4 ATTACHMENT 4 ANALYTICAL DATA FOR SUBSOIL DRAIN SAMPLING PROGRAM POINT BEACH NUCLEAR PLANT l

. I 1979 L

ANALYTICAL RESULTS (pCi/ml) l l

l Date Sample Gross Beta Tritium Cs-134 Cs-137 lQ79 A (a) --

(a) (a)

B (a) 4E-6 (a) (a)

DD (a) lE-6 (a) (a)

S-1 (a) lE-6 (a) (a)

S-3 (a) 2E-6 (a) (a)

S-10 (a) 2E-6 (a) (a)

HD1 (a) (a) (a) (a)

HD2 (a) (a) (a) (a) 2Q79 A (a) 2E-5 (a) (a)

B (a) 6E-6 (a) (a)

DD (a) 2E-5 (a) (a)

S-1 (a) lE-6 (a) (a)

S-3 (a) 2E-6 (a) (a)

S-10 (a) SE-7 (a) (a)

HD1 (a) (a) (a) (a)

HD2 (a) (a) (a) (a) 3Q79 A (a) 8E-6 (a) (a)

B (a) 3E-5 (a) (a)

DD (a) 3E-5 (a) (a)

S-1 (a) lE-6 (a) (a)

S-3 (a) 9E-7 (a) (a)

S-10 (a) 2E-5 (a) (a)

HD1 (a) (a) (a) (a)

HD2 (a) (a) (a) (a) 4Q79 A (a) 3E-5 (a) (a)

B (a) 6E-6 (a) (a)

DD (a) 3E-5 (a) (a)

S-1 (a) 9E-7 (a) (a)

S-3 (a) lE-6 (a) (a)

S-10 (a) 4E-7 (a) (a)

HD1 (a) (a) (a) (a)

HD2 (a) (a) (a) (a)

(a) Regular sampling schedule adopted in 1980.

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l 1980 ANALYTICAL RESULTS (pCi/ml)

Date Sample Gross Beta Tritium Cs-134* Cs-137*

lQ80 A 3E-8 2E-5 <lE-8 <lE-8

- lE-8 9E-6 <1E-8 <lE-8 DD lE-8 9E-6 <1E-8 <lE-8 S-1 SE-9 2E-6 <1E-8 <lE-8 S-3 7E-9 2E-6 <lE-8 <1E-8 S-10 8E-9 <5E-7 <lE-8 <lE-8 2Q80 A 3E-7 lE-5 2E-7 4E-7 B 4E-7 8E-6 3E-7 7E-7 DD 2E-6 lE-5 lE-6 3E-6 S-1 SE-9 7E-7 <4E-8 <2E-8 S-3 8E-9 8E-7 <8E-8 <SE-8 S-10 9E-9 3E-7 <4E-8 <3E-8 3Q80 A lE-7 lE-5 8E-8 2E-7 B 8E-8 7E-6 <3E-8 9E-8 DD 4E-7 6E-6 2E-7 5E-7 S-1 2E-8 3E-7 <4E-8 8E-8 S-3 8E-9 6E-7 <3E-8 8E-8 S-10 6E-9 <2E-7 <3E-8 <3E-8 HD1 3E-8 4E-4 <7E-8 <9E-8 HD2 <lE-8 6E-5 <5E-8 <3E-8 4Q80 A lE-8 2E-5 <8E-9 2E-8 B 4E-8 6E-6 <3E-8 <3E-8 DD lE-8 2E-5 2E-8 3E-8 S-1 8E-9 lE-6 <1E-8 4E-8 S-3 lE-8 8E-7 <7E-9 2E-8 S-10 7E-9 6E-6 <8E-9 2E-8 HD1 <lE-8 2E-4 <3E-8 <4E-8 HD2 <3E-7 SE-5 <9E-8 <lE-7 l

• All other gamma emitters were nondetectable (<lE-7 to <5E-7) l 1

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l 1981 ANALYTICAL RESULTS (pCi/ml)

Date Sample Gross Beta Tritium Cs-134* Cs-137*

lQ81 A lE-8 lE-5 <2E-7 <2E-7 B 9E-9 8E-6 <2E-7 <3E-7

, DD 7E-9 lE-5 <2E-8 <2E-8 l S-1 lE-8 lE-6 <2E-8 <4E-8 l S-3 5E-9 2E-6 <lE-8 <lE-8 S-10 SE-9 SE-7 <2E-8 <3E-8 HD1 2E-7 2E-6 <4E-8 <4E-8 HD2 3E-7 2E-4 <4E-8 <5E-8 2Q81 A 7E-9 2E-5 <5E-8 <4E-8 B lE-8 2E-5 <5E-8 <5E-8 DD 2E-8 2E-5 <2E-8 <2E-8 S-1 lE-8 <3E-7 <5E-8 <5E-8 S-3 9E-9 3E-7 <5E-8 <5E-8 S-10 7E-9 <3E-7 <3E-8 <2E-8 HD1 & HD2 4E-9 2E-4 <6E-8 <9E-8 -

• All other gamma emitters were nondetectable (<lE-7 to <5E-7)

DRAIN OUTFALLS TOTAL TRITIUM RELEASED (CURIES)

S-1 S-3 S-9 S-10 Total 1st Half, 1979 1.0E-4 6.8E-3 1.lE-2 3.9E-2 5.7E-2 4 2nd Half, 1979 4.lE-3 3.3E-3 2.7E-5 7.2E-3 1.5E-2 lst Half, 1980 1.6E-2 4.6E-3 0 1.5E-3 2.2E-2 2nd Half, 1980 1.6E-3 6.4E-4 0 3.9E-2 7.7E-3 1st Half, 1981 1.2E-3 9.0E-4 0 2.5E-3 4.5E-3 4

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