ML052270318

University of Wisconsin Nuclear Reactor Laboratory Fiscal Year 2004-2005 Annual Operating Report

ML052270318
Person / Time
Site:	University of Wisconsin
Issue date:	08/09/2005
From:	Agasie R Univ of Wisconsin
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML052270318 (23)

Text

Nuclear Reactor Laboratory University of Wisconsin-Madison 1513 University Avenue, Room 101 ME, Madison, WI 53706-1687, Tel: (608) 262-3392, FAX: (608) 262-8590 email: reactor@ engr.wisc.edu, http:llreactor.engr.wisc.edu License R-74 Docket 50-156 August 9, 2005 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555

Dear Sir:

Enclosed is a copy of the 2004-2005 Annual Report for the University of Wisconsin Nuclear Reactor Laboratory as required by our Technical Specifications.

Sincerely, Robert J./'Agasio!

Reactor Director Enc. (Annual Report) cc: Region III Administrator Compliance Inspector, Region II, Craig Bassett Facility Project Manager, Patrick Isaac Reactor Safety Committee, RSC 850

- 02_Oj

1 16 -

THE UNIVERSITY-OF WISCONSIN NUCLEAR REACTOR LABORATORY FISCAL YEAR-2004-2005 ANNUAL OPERATING REPORT Prepared to.meet reporting requirements of:

- U. S. Department of Energy SPECIAL MASTER TASK RESEARCH SUBCONTRACT NO. C96-175937 and U. S. Nuclear Regulatory Commission (Docket 50-156, License R-74)

Prepared by:

Robert J. Agasie Department of-Engineering Physics

. I

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page I of 21 EXECUTIVE

SUMMARY

OF REACTOR UTILIZATION Teaching: Teaching usage of the reactor during the year included:

76 Nuclear Engineering & Engineering Physics students in laboratory and lecture courses.

14 students and staff from other UW-Madison departments used the facilities for formal instruction or research.

7 students and staff from 5 additional college-level educational organizations used the facilities for formal instruction or research.

616 students and instructors from 13 non-college level educational organizations used the facilities for formal instruction or research as part of the UW Nuclear Reactor Outreach Program.

Research: Neutrons from the reactor were used primarily for neutron activation and analysis.

- 343 samples were irradiated for departments at UW-Madison.

- 21 samples were irradiated for other educational institution research programs.

- 254.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of neutron beam time were attributed to the study of neutron radiolysis in water at supercritical pressures and temperatures.

Industrial Use:

- One sample was irradiated for isotope production services.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 2 of 21 TABLE OF CONTENTS EXECUTIVE

SUMMARY

OF REACTOR UTILIZATION . . . . . . . .1 A.

SUMMARY

OF OPERATIONS . . . . . . . . . . . . . . .3

1. INSTRUCTIONAL USE --UW-Madison Classes and Activities . . . . . . . . . . . . . . . . . .3

2. REACTOR SHARING PROGRAM . . . . . . . . . . . .3

3. SAMPLE IRRADIATIONS AND NEUTRON ACTIVATION ANALYSIS SERVICES . . . . . . . . . . . . . . . . . 8

4. OTHER MAJOR RESEARCH USE . . . . . . . . . . . . . 9

5. CHANGES IN PERSONNEL, FACILITY AND PROCEDURES . . . . . . . . . . . . . . . . *. -. . 10

6. RESULTS OF SURVEILLANCE TESTS AND INSPECTIONS ................ ... . 11 B. OPERATING STATISTICS AND FUEL EXPOSURE . . . . ... . 11 C. EMERGENCY SHUTDOWNS AND INADVERTENT SCRAMS . . . . . . . 12 D. MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 13 E. CHANGES IN THE FACILITY OR PROCEDURES REPORTABLE UNDER 10 CFR 50.59 . . . . . . . ... . . . . . . . . . . . . 13 F. RADIOACTIVE WASTE DISPOSAL . . . . . . . . . . . . . . 14 G.

SUMMARY

OF RADIATION EXPOSURE OF PERSONNEL . . . . . . 15 H. RESULTS OF ENVIRONMENTAL SURVEYS . ... . . . . . . . . 15 I. PUBLICATIONS .. . . . ................ 16 TABLE 1 LIQUID RADIOACTIVE WASTE DISCHARGED TO SEWER 18 TABLE 2 EFFLUENT FROM STACK . . . . . . . . . . . . . . . 19 TABLE 3 EFFLUENT FROM POOL . . . . . . . . . . . . . . . 20 TABLE 4 ANNUAL DOSE DATA . . . . . . . . . . . . . . . . 21

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 3 of 21 A.

SUMMARY

OF OPERATIONS

1. INSTRUCTIONAL USE -- UW-Madison Classes and Activities Nuclear Engineering.& Engineering Physics (NEEP) 231, "Survey of-Nuclear Engineering" was offered in the spring semester with an enrollment of 30 students. The course is designed for freshmen students interested in nuclear engineering and consists of three lecture modules surveying fission, fusion and radiation science technologies. The fission module concludes with a reactor tour.

NEEP 427 was offered in the fall and spring semesters with a total enrollment of 28 students. Several NEEP 427 experiments use materials that are activated in the reactor.

One experiment entitled "Radiation Survey" requires that students make measurements of radiation levels in and around the reactor laboratory.

Eighteen students were enrolled in NEEP 428 which was offered in the spring and summer semesters. Three experiments in NEEP 428 require exclusive use of the reactor. These experiments ("Critical Experiment", "Control Element Calibration", and "Pulsing") required a total of 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br /> of exclusive reactor use. Other NEEP 428 laboratory sessions use material that has been irradiated in the reactor ("Fast Neutron Flux Measurements by Threshold Foil Techniques" and "Resonance Absorption").

2. REACTOR SHARING PROGRAM The University of Wisconsin Nuclear Reactor was again funded this year by the U.S. Department of Energy, Office of Nuclear Energy, Science and Technology to offer reactor services in accordance with the University Reactor Sharing Program. The purpose of the program is to make available university nuclear reactor facilities to non-reactor owning colleges, universities, and other educational institutions.

User groups affiliated with the host institution (UW-Madison) are also eligible for assistance, up to 35% of the awarded funds. This year, the Reactor Laboratory provided

$25,975 of reactor services free of charge to the user institutions under the University Reactor Sharing Program; of which, $20,000 was reimbursed by the U.S. Department of Energy. User institutions participation in this year's program are detailed below.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 4 of 21 Participating Principal Number of Faculty/

Institution Investigator Students Involved Argonne National Laboratory D. Bartels 3/0 Reactor tour and demonstration of supercritical water test loop.

Beloit College S. Ballou 1/0 Analyzed swipe tests to leak check radioactive sources and performed detector calibration.

Purdue University P. Wilson 1/0 Reactor tour and demonstration of supercritical water test loop.

University of Minnesota - Duluth G. Rapp 1/0 Gamma spectrographic analysis of material in support of returning NAA samples to the principle investigator.

University of Wisconsin - Madison Department of Engineering Physics T. Brigss 1/26 Reactor tour and lecture as part of the Energy Conversion Technologies course.

University of Wisconsin - Madison Department of Engineering Physics M. Swandby 0/19 Reactor tour and demonstration of supercritical water test loop in support of graduate research recruitment program.

University of Wisconsin - Madison Department of Engineering Physics T. Allen 3/46 Production of various activation foils as gamma emitting sources for the Instrumentation Laboratory.

University of Wisconsin - Madison Department of Engineering Physics J. Murphy 1/50 Reactor tour and lecture as part of the Introduction to Nuclear Engineering course.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 5 of 21 Participating Principal Number of Faculty/

Institution Investigator Students Involved University of Wisconsin - Madison Department of Engineering Physics J. Kulpin 1/0 Neutron calibration services provided to the Ion Beam Laboratory.

University of Wisconsin - Madison Department of Engineering Physics M. Anderson 2/2 NAA to measure trace elements in tubing to be inserted in the supercritical water test loop.

University of Wisconsin - Madison Department of Medical Physics I B. Thomadsen 3/5 Calculations of yttrium activation for preliminary work in a program to determine whether the radioactive yttrium can be plated to stents in order to aid in preventing re-blocking of an artery after the stent is placed following angioplasty.

University of Wisconsin - Madison Police Department T. Kuschel 1/0 Reactor tour and lecture on radiation and radioactivity in the environment.

University of Wisconsin - Madison Department of Soil Sciences P. Helmke 4/1 NAA to determine Fe, K/Na ratios, and trace element concentrations of samples from a soil-stoneline-ironstone complex in Uganda.

University of Wisconsin-Whitewater S. Sayhun 1/0 Analyzed swipe tests to leak check radioactive sources and performed detector calibration.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 6 of 21 Non-College Groups:

Participating Institution Number Instructor/Students Involved Abundant Life Christian High School 1/36 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor.

American Society of Mechanical Engineers, UW-Madison Branch High school Day on Campus 1/42 Engineering Society sponsored tours of College of Engineering facilities for area high school students. The tour included a discussion on nuclear energy in addition to a tour of the facility.

Boy Scouts of America 5/404 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor. Program included hands on demonstrations of radiation detection and shielding. Program co-sponsored by the UW student branch of the American Nuclear Society in support of the Scouts Atomic Energy Badge program.

Dodgeville High School 1/15 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor.

LaFollette High School 1/12 Advanced Science and Engineering Class. Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor. Provided real time gamma spectroscopy activation analysis laboratory demonstration.

New Tier High School 1/6 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor. Provided real time gamma spectroscopy activation analysis laboratory demonstration.

O'Keeffe Middle School 1/42 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 7 of 21 Participating Institution Number Instructor/Students Involved Nuclear Summer Science Seminar 1/10 Two, 1 week long seminars, on nuclear science for junior and senior high school advance physics and chemistry students from 9 area school districts. Students participated in lectures covering topics in atomic and nuclear structure, radioactivity, and shielding. Laboratory sessions included use of Geiger-Mueller and scintillation counters to experimentally investigate lectured topics. The final day was dedicated to lecture and demonstration of nuclear reactor physics utilizing the UW Nuclear Reactor.

Saturday Enrichment Program 1/17 A program sponsored by the Department of Education Outreach at the University of Wisconsin to allow local middle school students to explore math, science, and engineering. Reactor tour and nuclear energy discussion.

Society of Women Engineers Engineering Careers for Tomorrow 1/21 Student engineering society promoting women's roles in engineering programs. Visit included a reactor tour and talks with high school students about career options in nuclear science and engineering.

Summer Science Institute 1/6 A high school program designed to provide experience in biological and physical research programs. Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor.

Tim Cullen Internship Program 0/3 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor.

Waunakee High School 1/17 Reactor tour with a discussion on applications of nuclear energy and uses of the UW nuclear reactor.

USER

SUMMARY

Educational Institutions: 27 Students: 780 Faculty/Instructors: 39

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 8 of 21

3. SAMPLE IRRADIATIONS AND NEUTRON ACTIVATION ANALYSIS SERVICES There were 365 individual samples irradiated during the year. Of these samples, 119 were irradiated for 15 minutes or less. Samples accumulated 120.5 irradiation space hours and 300.7 sample hours. Many samples were irradiated and then counted at the Reactor Laboratory as part of our neutron activation analysis service. In the listing below the notation (NAA) indicates that the samples were processed by our neutron activation analysis service.

Engineering Physics Department, 1UW-Madison UW Nuclear Reactor Laboratory 6 samples, 4.75 sample hours Production of calibration sources for required reactor measurements and development of methods for instrumental neutron activation analysis. UW support.

Engineering Physics Department, UW-Madison Graduate Research Project 6 samples, 3.9 sample hours Irradiation of activation salts for measuring the spacial flux distribution of beam port number 2. Supported by DOE Reactor Sharing Program.

Engineering Physics Department, UW-Madison Instrumentation Laboratory 120 samples, 118.7 sample hours Irradiation of foil sources for radiation detector experiments, including absolute counting for neutron flux measurements and activation of samples for neutron activation analysis experiment. Supported by DOE Reactor Sharing Program.

Engineering Physics Department, UW-Madison NEEP 428 77 samples, 97.3 sample hours Irradiation of foils for resonance absorption measurements and fast neutron flux measurements. UW support.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 9 of 21 Department of Soil Sciences, UW-Madison (NAA) 134 samples, 67 sample hours Professors J. Norman, V. Holliday, K. McSweeny, and P.

Helmke and 1 graduate student used NAA to determine Fe, K/Na ratios, and trace element concentrations of samples from a soil-stoneline-ironstone complex in Uganda. This information determines the degree and type of weathering, geochemistry and hydrology which control formation of these types of complexes throughout much of the tropics.

Supported by the DOE Reactor Sharing Program.

New Tier High School Program (NAA) 13 samples, 3.25 sample hours Activation foils provided for real time gamma spectroscopy activation analysis laboratory demonstration as part of a reactor tour and discussion on applications of nuclear energy and uses of the UW nuclear reactor. Supported by DOE Reactor Sharing Program.

Nuclear Science Summer Seminar (NAA) 8 samples, 2.0 sample hours Neutron Activation Analysis services were provided as part of a week long seminar on nuclear science. Supported by DOE Reactor Sharing Program.

NWT Corporation 1 samples, 3.8 sample hours Irradiation of sodium to produce 24Na for use as a radioactive tracer in moisture carry over tests performed at a regional utility's nuclear generating station. Industrial support.

4. OTHER MAJOR EDUCATIONAL AND RESEARCH USE The reactor Laboratory is continuing collaboration with Argonne National Laboratory and the Notre Dame Radiation Laboratory on the study of neutron radiolysis in water at supercritical pressures and temperatures. This project is supported by the U.S.. Department of Energy NERI (Nuclear Energy Research Initiative) grant. In order to investigate this radiolysis, a water loop has been designed, assembled and inserted into beam port 2 of the UW nuclear reactor.

This loop is designed to pressurize water to 25 MPa (3600 psi) and heat it to 500 C (932 F). The water is then transported near the core of the reactor and returned to be analyzed.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 10 of 21 Upgrades to the experiment apparatus have been made over the

.past year including a 3 inch removable lead shield near the core of the reactor to shield gammas which has increased the neutron to gamma ratio to 2.8.

Experiments to determine the critical hydrogen concentration (CHC), the concentration of hydrogen gas in water necessary to prevent formation of stable corrosive species such as H2 02 and 02, have been run at supercritical temperatures and pressures. Results have found that while operating with a high neutron to gamma ratio evidence of CHC behavior is seen, but the concentration of formed species never approaches zero. This is most likely due to the high concentration of high average LET (linear energy transfer) radiation such as fast neutrons. Previous data taken before the installation of the lead shield showed a more definite trend that all hydrogen peroxide and oxygen formation was prevented at some point during the experiment.

5. CHANGES IN PERSONNEL, FACILITY AND PROCEDURES Any changes reportable under 10 CFR 50.59 are indicated in section E of this report.

Additional upgrades to the facility, not reportable pursuant to 10 CFR 50.59, were completed during the year as described below.

A 530 square foot mezzanine was installed in the north bay of the reactor confinement room. The mezzanine was constructed of M inch thick steel plate placed on existing steel structural frame work. The existing structural frame work was installed during original construction for offices, but was never completed. The steel plate was installed to create an open air mezzanine for storage.

Personnel changes during the year were as follows:

Reactor operator Athi Varuttamaseni OP-70179-1, was removed from licensed status. Mr. Varuttamaseni's license was terminated July 26, 2004, upon graduating and resigning his position with the university.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 11 of 21 Senior reactor operator Stephen M. Matusewic, SOP-03769-6, was removed from licensed status. Mr. Matusewic's license was terminated October 22, 2004, upon retiring from the university.

Michelle M. Blanchard, was appointed as Reactor Supervisor effective October 22, 2004 upon the retirement of the incumbent supervisor, Stephen M. Matusewic.

Professor Paul P.H. Wilson was appointed to the Reactor Safety Committee upon the resignation of Reactor Safety Committee Member Douglass L. Henderson.

6. RESULTS OF SURVEILLANCE TESTS AND INSPECTIONS The program of inspection and testing of reactor components continues, satisfactorily meeting procedural acceptance criteria. Inspection of underwater components during the annual maintenance showed no deterioration or wear.

The pool leak surveillance program continues to monitor the pool evaporation rate, the.pool make-up volume, and pool water radioactivity. Analysis continues to show 3 H to be the only radionuclide present with an average concentration of 9.8xlO 5yCi/ml, which is 9.8% of the 10 CFR Part 20, Appendix B, Table 2, column 2, maximum allowable water effluent release concentration. The pool leak had ceased during the year, but was observed to commence leaking in October 2004. The leak has since ceased again. Monthly totals of pool water loss to the environment and 3H concentrations are summarized in Table 3, at the end of this report.

B. OPERATING STATISTICS AND FUEL EXPOSURE Critical Operating Period Hrs MW Hrs Runs Pulses Fiscal Year 2004-2005 522.14 460.61 109 21 FLIP Core 16,720.86 13,962.41 4,771 1,000 TRIGA 23,985.85 18,950.59 6,761 2,311 Core I23-RlO was operated throughout the year. The excess reactivity of this core was determined to be 4.272%p.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 12 of 21 C. EMERGENCY SHUTDOWNS AND INADVERTENT SCRAMS There were seven automatic scrams or unintentional shutdowns during the year. Each is described below in chronological sequence.

July 20, 2004; Rely and electronic SCRAM from picoammeter number 2. While attempting to increase reactor power from 300 W to 1000 kW, an operator failed to up range the picoammeter to the next higher range prior to withdrawing a control blade. Reactor power was already at 100% indicated power on the 300 W range, when the operator inserted the positive reactivity. Sufficient reactivity was inserted into the reactor resulting in reactor scram from a neutron high flux trip of 125% on the 300 W range.

On August 17, 2004, October 7, 2004, November 11 and 16, 2004, February 18, 2005 and March 1, 2005 a relay SCRAM or unintentional drop of a control element from the Fuel Temperature Safety Channel occurred. In every event, true fuel temperature did not approach the limiting safety system setting (LSSS), as observed on the installed console recorder. Because it was known that the true fuel temperature did not reach the LSSS, the fuel temperature safety channel was investigated for intermittent opening of the thermocouple signal leads. On-August 17, one thermocouple connection on a terminal board was found to be damaged and was repaired. On October 7, the input to the fuel temperature safety channel was loose and subsequently tightened. On November 11 the connections at the instrumented fuel element weather head were inspected and deemed to be poor and subsequently repaired. On November 16, in an attempt to rule out a thermocouple intermittent open in the instrumented fuel element, the input to the fuel temperature safety channel was replaced by another thermocouple in that same fuel element. On February 18, the input to the fuel temperature safety channel was replaced by the third thermocouple in the same fuel element. On March ilt, after having repaired all connections, verified operability of each thermocouple in the instrumented fuel element, the fuel safety temperature safety channel, 19MI was replaced with the installed spare, 19M2. No further spurious SCRAMs were observed. This led to the conclusion that the trip relay in 19M1 was experiencing intermittent failure.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 13 of 21 D. MAINTENANCE The Preventive Maintenance Program continues to maintain equipment and systems in good condition. Routine regeneration of the demineralizer resins were performed on July 9, 2004 and December 14, 2004.

Corrective maintenance was performed on the following systems:

The ball check valve of the thermal column exhaust line was replaced on July 1, 2004 following observation of a crack in the existing ball check valve.

On November 6, 2004, the tensioning spring of the fission chamber drive was replaced after the existing spring no longer maintained tension and the drive chain slipped from the drive sprocket.

As described in section C of this report, On March .1, 2005, the installed fuel temperature safety channel, 19M1, was replaced with the installed spare, 19M2, to eliminate spurious reactor SCRAMS as a result of a failing relay in 19M1.

In May 2005, in response to drifts in the gain of the Log Count Rate Monitor, an investigation revealed the pre amplifier low gain TRA-1000 chip was bad. The chip was replaced.-

On June 10, 2005, the GM tube in the thermal column area radiation monitor was replaced following observation of the detector indication pegging high twice; a symptom known to indicate incipient failure of the GM tube.

E. CHANGES IN THE FACILITY OR PROCEDURES REPORTABLE UNDER 10 CFR 50.59 There were no changes in the facility or procedures reportable pursuant to 10 CFR 50.59.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 14 of 21 F. RADIOACTIVE WASTE DISPOSAL

1. SOLID WASTE All solid waste was transferred to the University Broad Scope license for ultimate disposal in accordance with radioactive materials license number WI 25-1323-01.

The amount and activity are detailed below.

Activity Date Isotope (mCi) 07/30/2004 Co-60 7.4E-4 Mn-54 4.7E-5 Zn-65 4.9E-4 Total: 1.2E-3 Volume: 2.7 cubic feet Constituents: contaminated steel pipe Activity Date Isotope (mCi) 09/07/2004 Co-60 4.5E-2 Eu-152 1.OE-3 Mn-54 1. 7E-2 Zn-65 4.9E-2 Total: 7. 1E-2 Volume: 1.94 cubic feet Constituents: cellulose and nylon filters

2. LIQUID WASTE RELEASED TO THE SANITARY SEWER Liquid waste discharges from the facility during the year are detailed in Table 1.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 15 of 21

3. PARTICULATE AND GASEOUS ACTIVITY RELEASED TO THE ATMOSPHERE Table 2 presents information on stack discharges during the year.

4. LIQUID ACTIVITY RELEASED TO THE ENVIRONMENT Table 3 presents information on the pool leak effluent described in section A.6 of this report to the environment during the year.

G.

SUMMARY

OF RADIATION EXPOSURE OF PERSONNEL (01/01/04 - 12/31/04)

The personnel radiation monitoring program at the University of Wisconsin for the past calendar year used Global Dosimetry brand TLD monitors for whole body exposure while extremity dose.was monitored using TLD ring badges processed by the University of Wisconsin Radiation Calibration Laboratory. No personnel received any significant radiation exposure for the above period. The highest annual doses recorded were 41 mrem to the whole body and 135 mrem to the extremities.

The highest dose received by a member of the public visiting the reactor lab was 1.494 mrem, as measured by Siemens brand Electronic Personal Dosimeters.

Monthly radiation surveys continue to demonstrate acceptable radiation dose rates within the reactor laboratory and no contamination.

H. RESULTS OF ENVIRONMENTAL SURVEYS (01/15/04 - 01/14/05)

The environmental monitoring program at the University of Wisconsin uses Landauer Luxel brand area monitors located in areas surrounding the reactor laboratory. Table 4 indicates the dose a person would have received if continuously present in the indicated area for the entire 2004 calendar year.

F2P.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 16 of 21 In the 3rd quarter of 2004 TLD #33 reported a quarterly dose of 379 mrem. TLD #33 is located outside Room 10E of the Reactor Lab basement. This area is unrestricted but not normally occupied.

Hypersensitive surveys of the room and outside walls were performed and continuous monitoring with electronic dosimeters for 12 weeks was conducted. The results of the surveys and monitoring revealed a dose rate of 0.017 mrem/hr or a quarterly dose of 36 mrem. Additional environmental monitors in the area have revealed an average dose rate of approximately 20 mrem/quarter. Subsequent quarterly values for TLD #33, show a dose rate of approximately 18 mrem/quarter.

While it is not clear why such a high reading was observed by TLD #33, protective measures have been taken to reduce dose rates in and around Room 10E including additional shielding and limiting access to the area. A dose reconstruction analysis shows that the dose to any person spending 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> a week in that area (very conservative) is less than 20 mrem for the entire 3 months.

I. Publications The following are theses, publications and presentations based on reactor use:

Edwards, E. Radiation Chemical Yields of Water in Neutron and Gamma Radiation. 2005 ANS Annual Meeting. San Deigo, CA.

June 7, 2005.

Edwards, E., Bartels, D., Olson, L., Wilson, P.,

Anderson, M., Humrickhouse, P. Radiation Chemical Yields of Water in Neutron and Gamma Radiation. Transactions of the American Nuclear Society. V 92, pp. 125. San Deigo, CA.

2005.

Humrickhouse, P. Gamma Shield Design for the Supercritical Water Neutron Radiolysis Experiment. 2005 ANS Annual Meeting. San Deigo, CA. June 7, 2005.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 17 of 21 Humrickhouse, P., Wilson, P., Edwards, E., Anderson, M. and Bartels, D. Gamma Shield Design for the Supercritical Water Neutron Radiolysis Experiment. Transactions of the American Nuclear Society. V 92, pp 161. San Diego, CA. 2005.

Law, R. A Diachronic Examination of Lithic Exchange Networks During the Urban Transformation of Harappa. South Asian Archaeology. Proceedings of the 17th International Conference fo the European Association of South Asian Archaeologists. Bonn, Germanay. 2005.

Wilson, P. Operational Benchmarks for the Computational Modeling of the UWNR. TRTR Annual Meeting. October 15, 2004.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 18 of 21 TABLE 1 LIQUID RADIOACTIVE WASTE DISCHARGED TO SEWER Release Date: 07/01/2004 05/24/2005 06/22/2005 Gallons Released: 1350 1450 1950 Total pCi: 23.36 2.00 6.16 Sum of Fraction of 0.092 0.012 0.018 MPC w/o dilution:

Sum of Fraction of MPC w/ daily 0 . 005 0.001 0.001 dilution:

MPC Isotope (uCi/ml) Released Released Released Co-60 3. OE-05 6.21 2. 00 3.78 pCi 1.22E-6 3.64E-07 5.10E-07 pCi/ml Fraction 4.05E-02 1.21E-02 1.70E-02 nrf MD('

Mn-54 3.OOE-04 4.78 2.38 pCi 9.35E-07 - 3.20E-07 pCi/ml 3.12-03 1.0E-03Fraction 3.12E03 l* 3 of MPC Zn-65 5.OOE-05 12.37 - - pCi 2.42E-06 - - pCi/ml 4.84E-02 - Fraction of MPC Total volume of water released to the sanitary sewer (gallons) 4750 Total quantity of radioactive material released to the sanitary sewer(pCi) = 31.52 Average daily sewage flow for dilution (gallons) = 2.37E+04 Maximum fraction of MONTHLY release limit with DAILY dilution 0.005 Maximum fraction of MONTHLY release limit with MONTHLY dilution 0.0003

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 19 of 21 TABLE 2 EFFLUENT FROM STACK

1. Particulate Activity There was no discharge of particulate activity above background levels.

2. Gaseous Activity - All Argon-41 Month Activity Maximum Average Discharged Concentration Concentration (Curies) pCi/ml x 1E-6 PCi/ml x lE-6 July 2004 0.0699 1.80 0.0390 August 0.0499 1.50 0.0278 September 0.0453 1.30 0.0261 October 0.0516 1.50 0.0288 November 0.0588 1.50 0.0339 December 0.0130 1.50 0.0073 January 2005 0.0251 2.00 0.0142 February 0.0330 2.80 0.0204 March 0.0153 1.10 0.0085 April 0.0086 0.09 0.0050 May 0.0376 1.10 0.0210 June 0.0057 0.90 0.0033 Total Maximum Average 0.4138 2.80 0.0196 Using Gifford's model, as described in the appendix to the "Safety Analysis Report for the University of Wisconsin Nuclear Reactor", a concentration of 8E-6 pCi/ml at the stack discharge would result in a maximum air concentration of 1E-8 pCi/ml at any point downwind.

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 20 of 21 TABLE 3 EFFLUENT FROM POOL 3H Liquid Release to the Environment - All Activity Month Water Monthly Activity Fraction Released Concentration Released of MPC (Gallons) (PCi/ml) (mCi)

July 2003 0 0.000 August 0 0 . 000 September 0 0.000 October 295 1. 11E-4 0. 124 0 . 111 November 336 8.38E-5 0.107 0.084 December 308 1.28E-4 0. 150 0.128 January 2004 0 0 .000 February 0 0.000 March 0 0. 000 April 0 0. 000 May 0 0.000 June '0 0.000 Total Average Total Average 939 1.08E-4 0.380 0.108

UWNR ANNUAL REPORT- Fiscal Year 2004-2005 Page 21 of 21 TABLE 4 ANNUAL DOSE DATA -- Environmental Monitors (01/15/04 - 01/14/05)

Annual Dose Location mrem Highest Dose Inside Reactor Laboratory 353.0 Dose Inside Reactor Laboratory Stack 28.0 Highest Dose Outside Reactor Laboratory (Reactor Lab Basement:

See section H of this report for more information) 416.0 Highest Dose in Occupied Non-restricted Area (East wing hallway of Mechanical Engineering Building) 39.0 Average Dose in all Non-restricted Areas (28 Monitor Points) 26.3