ML19253A882
| ML19253A882 | |
| Person / Time | |
|---|---|
| Site: | University of Lowell |
| Issue date: | 08/29/1979 |
| From: | MASSACHUSETTS, UNIV. OF, LOWELL, MA (FORMERLY LOWELL |
| To: | |
| Shared Package | |
| ML19253A874 | List: |
| References | |
| NUDOCS 7909120234 | |
| Download: ML19253A882 (11) | |
Text
% e OPERATING REPORT FOR THE UNIVERSITY OF LOWELL REACTOR FOR THE PERIOD JULY 1, 1978 TO JUNE 30, 1979 DOCKET NO. 50-223 ..
LICENSE NO. R-125 W
S33060 7 909120 Z3
A. Introduction In the late 1950's, the decision was made to build a Nuclear Center at what was then Lowell Technological Institute. Its statc0 aim was to e
train and educate huclear scientists, engineers and technicians, to serve as a multi-disciplinary research center for LTI and all New England academic institutions, to serve the Massachusetts business community and to lead the way in the economic revitalization of the Merrimack Valley. The decision was taken to supply a nuclear reactor and a Van de Graaff accelerator as the initial basic equipment.
Construction of the Center was started in the summer of 1966. Class-rooms and offices were in use by 1970, and the Van de Graaff accelerator was put into service in that year. Reactor License R-125 was issued by the Nuclear Regulatory Commission on December 24, 1974 and initial criti-cality achieved January,1975.
B. Function The Nuclear Center is a major res- arch focal point of the University.
Last year alone, 45 publications
- in learned journals or presentations at Icarned society meetings were the direct result of the Nuclear Center.
More than 135 graduate students have used or are using the Center's services; the comparabic number for the faculty is in excess of 27. Much research here is correlated with safety and efficiency in the nuclear and radiation industries, including public utilities, pharmaceuticals, medical applications, health effects, etc., however, much research also is done by workers in other fields who use the unique facilities as analytical tools 45 publications were produced during fiscal 1978 (July 1977 through June It ~3),
1979 figures not availabic.
f):33()!30.
Page 2 In addition, the Nuclear Center facilities- are used in the course work of various departments of the University. The Nucicar Center also provides these services to other universitics in the New England area, government agencie's and, to a limited extent, industrial organizations in Massachusetts and the New England area.
C. _ Operating Experience
- 1. Staff Chanqcs Mr. Michael Evans was confirmed by the Board of Trustees as the Chief Reactor Operator in October, 1978. Three reactor oper,ators have resigned and not been replaced. It is expected that two operators will be hired in the near future. Presently, there are four SRO and two R0 licensed persons on site.
Dr, Leon Beghian continues to serve as the Director of the Nuclear Center.
- 2. Experiuents During the report period, the major uses of the reactor were for activation analysis, dosimetry studies and for teaching purposes.
Activation analysis techniques were used to study paint, toys, trees, vegetables, human hair and nails, drugs and cosmetics, geological rocks, resins, coal and charcoal, electronic components, and acrosol co11ceting filter paper.
The properties of aggregate recoil particles continues to be an active research area as is the efficacy of various filter media.
A major area of research this year has been in the area of neutron dosimetry and Nitrogen-16 dosimetry.
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Page 3 A large amount of reactor time was used in direct support of University courses. Folio and wires were irradiated for flux measure-ments, various isotopes were produced for activation analysis and other counting classes and labs. Control rod calibrations, an approach to critical, measurements of positive and negative periods and prompt drops, temperature coefficients and calorimetric measurements of power were included in a Reactor Operations course and students in Radiological Sciences measured radioactive effluents, did some foil activations and performed standard surveys.
- 3. Operations Summary During the courst of the year 1978-1979, the reactor was critical a total of 931 hours0.0108 days <br />0.259 hours <br />0.00154 weeks <br />3.542455e-4 months <br />. 1hr utilization is broken down as follows:
Operating flours 931.5 Hours at scheduled power 712.5 Accumulated Megawatt hours 705.2
. Experimental Utilization Sample llours 804.3 Number of Irradiations 285 Number of hours for training 151.0
- 4. Changes in Facility Design The thermal column graphite stringers were modified to accept foils on an axial plane.
Piping was added to the primary system (at the chemical addition standpipe) to facilitate diversion of a small percentage of flow through a chamber for N-16 dosimetry measurements.
A flow deflector was added to the primary coolant piping where the flow returns to the pool. This deficctor reduces control blade flutter for more stable period channel indication. It also allows a more accurate measurement of the differential temperature across the core by 8Elmmmah 333063
Page 4 preventing channeling of flow over the sensor.
The regulating rod drive brate assembly was redesigneJ. The original design was a simple spring assembly which needed constant re-adjustment due to wear and spring tension changes. The brake was replaced by a magnetic brake.
A holder was mounted on the reactor bridge to allow for the operational testing of neutron chambers.
The AT system was modified by installing an iron-constantan thermo couple in a permanent mount on the core outlet plenum.
- 5. Performance Characteristics The reactor has performed well over the past year. A total of 19 scrams occurred during the year. Reasons:
(a) Operator error (2)
(b) Lincar Power Channel range switch (2)
(c) Loss of power (1)
(d) Low line voltage (4)
(e) Electronic noise (Safety Channel
- 2) (8)
(f) liigh flux scram - equipment malfunction (1)
(g) Electronic noise period channel (1)
Radiation surveys at licensed power showed no adverse variation from expected levels, and no fission products were detected outside the reactor core.
The containment building ventilation system operated satisfactorily during this report period. The leak rate of the building was not observed (see procedure changes), Section C.6 below. ,a,3 d, o o, .4 h,,
Page 5
- 6. Changes in Operating Procedures The Requalification Program was changed to reflect a passing grade of 70% and an examination frequency of two years. These changes were approved by operator Licensing Branch of the NRC.
The Integrated Containment Leak Rate Test frequency was reduced to every two years af ter NRC approval of an amendment to our Technical Specifications.
R0-2 (Reloading the Core to a Known Configuration) was rewritten to allow movement of fuel with all blades fully inserted. SP-16 (Rod Drop and Drive Measurements) was amended to clarify the magnet current set points after surveillance testing.
- 7. Results of Surveillance Tests and Procedures Surveillance tests and inspections were performed according to schedule. There were no abnormalities discovered which would violate the Technical Specifications or good practice. Furthermore, no trends indicating deterioration of components were seen.
D. Energy Generated Energy Generated Number of I!ours Total Cumulative During Report Period Reactor was Critical Energy Output (WD) (WD) 29.383 931.5 62.533 E. Emergency Shutdowns There was one emergency shutdown during the report period due to high flux. A malfunction of the regulating rod brake assembly caused reactor power to increase until the reactor scrammed on a high flux. The brake assembly has been redesigned (See Section 4).
Other reactor scrams are listed in Section 5. c O d,30f6a g , ,, ,
age 6 F. Maj or Maintenance The Log Count Rate Amplifier in the Start-Up Channel was completely refurbished. All aped components-capacitors , resistors and tubes-were replaced. -
One of the compensated ion chambers in a safety channel failed and was replaced with a Reuter-Stokes CIC.
The upper personnel airlock hydraulic motors were overhauled due to hydraulic fluid seal leakage. It is anticipated that this airlock hydraulic system will be completely replaced in the coming year.
G. Changes to the Facility under 10CFR 50.59 All facility changes to date do not pose an unrevicwed safety question.
The surveillance frequency for containment leak rate testing was reduced to biennial and has been approved by the NRC via license amendment. All procedural changes and changes which presented a situation not covered in the FSAR were submitted to the Reactor Safety Subconnittee for prior approval. All procedural changes have been listed in C.6. All other changes made throughout the year are listed under Changes in Facility Design or Major Maintenance,
- 11. Environmental Surveys Surveys of the environs external to the reactor building have shown no increases in radiation IcVels or concentrations of radioactivity as a result of reactor operations.
Air particulate samples collected at continuously monitored sites have shown no reactor produced activities. Grab sampling of air downwind from the reactor has also shown no activity other than naturally occurring species.
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Page 7 Water samples collected from the Merrimack River upstream and down-stream of the reacter location similarly have yielded no radioactivity associated with reactor operations.
While we have not found that film badges or limited numbers of TLD's have been useful in a routine program in environmental monitoring, we have recently instituted a TLD monitoring program in which we have assigned multiple dosimeters to five locations in the environment. 1he dosimeters are presently being retrieved on a relatively frequent basis (monthly to be ext ended to quarterly), but in the future will be Icf t in the environment for from six months to one year. hhile these will not provide short term information, they are expected to provide reasonably accurate estimations of annual doses in the environment which can be compared against doses to control location dosimeters.
I. Radiation Exposures and Facility Surveys
- 1. Personnel Ex,posures Personnel dose control efforts continue to attempt to maintain doses consistent with ALARA philosophy. The number of individuals involved in research, training, and education using the reactor has increased and the numbers receiving so:re response to radiation have also increased.
Twenty-six individuals received measurable whole body penetrating doses; six were operations personnel, twelve were support personnel, and eight were experimenters. The highest quarterly dose received by an individual was about 50% of the 10CFR 20.101 allowed value. A dose summary is presented below.
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- 2. Radiation Surveys Radiation levels measured in the reactor building have been typically less than 0.1 mren hr-1 in general areas. A number of experiments have been conducte'd in which transient levels at specific locations have ocen in excess of 100 mren hr-l. Doses in these instances have been con-trolle! by use of shielding and/or personnel access control. The pwap room remains designated as a high radiaticn area during reactor operation.
- 3. Contamination Surveys General area contamination has not been a problem in the reactor building. Contamination has expectedly occurred at specific locations where samples are handled and particular experiments have been in progress.
Surface contamination IcVels have generally been less than 10-4 pCi/100 cm".
llandling tools and other specific items have exhibited contamination up iCi,100 cm'. 24 to about 10- "
Na is the most commonly encountered contami-nant. Air sampling in the reactor building has identified no significant quantities of reactor produced airborne radioactivity.
9330(33 6
Page 10 J. Nature and Ar.:ount of Radioactive Wastes
- 1. Liquid Wastes Following is a sunnary of radioactivity releases to the sanitary sewer during the reporting interval:
Date Gross Beta Undiluted Gross Diluted Gross Beta Radioactivity Beta Activity Activity Concentration (pC1/n1)
Released (Ci) Concentration (pCi/n1) Daily Monthly
-6 9/6/78 9.3S x 10 6.192 x 10- 3.290 x 10~ 1.154 x 10~
-6 -8 10/17/78 6.35 x 10 2.235 x 10~ 2.126 x 10
-8 x 10
-7
-4 -6 10/26/78 1.049 x 10 3.696 x 10 3.729 x 10
-6 12/11/78 1.022 x 10- 3.600 x 10 3.425 x 10- 1.217 x 10~
-5 -6 1/10/79 3.097 x 10- 1.091 x 10 1.03S x 10
~0 1/18/79 8.129 x 10 3.06S x 10' 2.919 x 10~
-6 2/1/79 7.952 x 10 2.801 x 10- 2.665 x 10-
}
i 9.936 x 10
,g 2/21/79 6.745 x 10~ 2.376 x 10
-6 2.260 x 10 J
-5 -6 --
4/6/79 7.015 x 10 2.471 x 10 2.351 x 10 ' -
_7 1.S53 x 10
-5 -6 4/19/79 8.050 x 10 3.038 x 10 ,890 x 10 g -4 -5 -6 -8 g 5/16/79 3.865 x 10 1.361 x 10 1.295 x 10 4.602 x 10 C,2 -6
-4 -5 O 6/7/79 4.875 x 10 1.717 x 10 1.633 x 10 ~
,I 6.959 x 10 C 6/25/79 7.819 x 10
-5 2.754 x 10
-6 2.620 x 10
-7 j 0
Diluted by daily flow of 2.7 x 10 nl.
Page 11
- 2. Gaseous Wastes Argon-41 continues to be the only reactor produced radioactivity identifiable in the gaseous effluent. Following are the stack release 1
data for Ar for the reporting period:
Saturation Quantity Time Averaged Time Averaged of 41A r in Total Total Activity Release Rate Release Concentra- Environment Based on Released (Curi es) (pCi sec~I) tion (pCi cm-3) Time Averaged Release Rate (Curies) 55.875 1.772 2.504 x 10' 1.685 x 10~
- 3. Solid Kastes Solid wastes, primarily paper, disposable clothing, and miscellaneous items have been packaged in appropriate containers but no off-site shipments have been made during the reporting period.
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