ML20151Y710
| ML20151Y710 | |
| Person / Time | |
|---|---|
| Site: | 05000433 |
| Issue date: | 12/31/1985 |
| From: | Kroes R, Profio A CALIFORNIA, UNIV. OF, SANTA BARBARA, CA |
| To: | NRC |
| References | |
| NUDOCS 8602130108 | |
| Download: ML20151Y710 (5) | |
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UNIVERSITY OF CALIFORNIA, SANTA BARBARA L-77 TRAINING REACTOR ANNUAL REPORT OF OPERATIONS January 1, 1985 through December 31, 1985 Facility License R-124 Docket No. 50-433 A.E. Profio, Reactor Director January 27,-1986 r
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9602130100 851231
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T Operatino Experience. Chances and Tests This is the eleventh annual report for the 10 watt, L-77 training reactor at the University of California, Santa Barbara. It will be the last report as the reactor is scheduled to be decommissioned in early 1986.
The L-77 reactor is operated mainly for instruction in nuclear engineering. It has been the principal facility in the NE125 Neutronics Laboratory course. The course is required for all B.S. degree majors in nuclear engineering, and may be taken as an elective by graduate students. The course was offered twice in 1985, once in the Spring Quarter and once in the Fall Quarter. There were 10 students in the spring, and 11 students in the fall. Experiments included approach to critical by subcritical multiplication, control rod calibration by subcritical and critical (period) measurements, reactivity worth and importance measured versus core posi t i on of absorbi ng and scat ter i ng sampl es, and power calibration by flux plotting. The Senior Operator is Professor A.E. Profio. An operator trainee (Stuart Scheffel) performed the weekly alarm checks as well as maintenance of the reactor and instruments.
There were no significant changes in the facility in I
, 1985.
Tests and Calibrations Performed:
Annual Power calibration 5-22-85 Control rod worth 5-08-85 Control inspection 4-05-85 Radmon/ CAM cal i b. 4-18-85 Se i smi c cal i b. 3-22-85 Tank / console maint.
Semiannual Rod drop times 1-16-85 7-24-85 Pressure scram / cal. 6-05-85 (1-07-86)
Shield water scram 6-05-85 (1-07-86)
, Flux instr / rec. cal. 3-26-85 10-16-85 Rad /contam. survey (12-17-84) 7-10-85 Radiation and security alarms were checked weekly. All calibrations and tests were satisfactory.
Unscheduled Shutdowns and Scrams l 5-08-85: Scram cn incorrect range switching picoammeter.
l 5-15-85: Scram on range switching picoammeter.
7-10-85: Scram on electrical transient from drive switch.
i 10-30-85: Scram on incorrect range switching picoammeter.
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Preventive and Corrective Maintenance Operetions l l
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Nor me l Dreventive and corrective maintenance was carried out. There were no false radiation alarms, but a number of f51se security alprms were experienced because of incorrect breassing of e door al arm. The alarm system was impaired during part of the Christmas vacation in that one motion alarm was not signaled to the Dispatcher, although it did 61srm locally, and the other intrusion alarms were fully functional. Police patrols were increased during this period. The problem was solved by replacement of a defective solid state relay in the motion detector.
Ch+ noes Under 10CFR 50.59 None.
Radioactive Effluents Discharoed Liquid wastes: none.
Solio wastes: very low level. contaminated gloves and similar items, plus some tritium-contaminated surplus eauioment in the facility, were disposed of as radwaste.
These items are awaiting pickup and disposal by a contractor, through the Environmental Health and safety Office on campus.
Gaseous wastes: not discharged during operation as
- core-recombiner vessel is sealed and under vacuum. The core-recombiner vacuum (pressure) gage is recalibrated, and the loss-of-vacuum trip and alarm are tested, semiannually.
This is done by admitting air and then reevacuating into a holdup tank. Short-lived gaseous activity decays between tests. Long-lived activity, in particular 10.4-year half life Kr-85, is discharged to the atmosphere after mixing with room exhaust, when the holdup tank is evacuated.
Calculations based on watt-oours of operation, fission yield of Kr-85, and conservative 1/ neglecting radioactive decay, give 0.22 microcuries of Kr-85 activity discharged in 1985, which has negligible impact on health.
Environmental Surveys Done Outside Facility Radiation' levels are measured immediately outside the facility as part of the semiannual radiation and contamination survey. All were background level of l owe s t measureable (less than 0.1 mR/h). The reactor is operated as close to 10 watts as is feasible in these surveys.
Sionificant Radiation Exoosure None.
Enerov Outout in 1985 t
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7.1 watt-hours.
i Hourt' Critical in 1985 13.4 Enerov Output Since Initial' Criticality 350.2 watt-hours (14.6 watt-days).
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UNIVERSITY OF CALIFORNIA. SANTA BARBARA tr.mxrLEY . Davis . IRVINE
- LOS ANCEI.ES
- RIVERSIDE
- SAN DIECO . SAN FRANCISCO SANTA BARBARA
- SANTA CRUZ DAvio PIERPONr CARDNER President q(the Uniwraity OFFICE OF Tile CII ANCELIAR SANTA BARBARA. CALIFORNIA 93106 ROBERT A. IiUTTENBACK Chancellor at Santa Barbara February 3, 1986 Facility Licensing Branch U.S. Nuclear Regulatory Commission Washington, DC 20555 Re: Docket 50-433, License R-124
Dear Sir:
Enclosed are twenty-one copies of the Annual Report of Operations of the L-77 training reactor at the University of California, Santa Barbara, for the calendar year 1985.
Sincerely, Robert J. Kroes Vice Chanec11or Administrative Services State of California 1 On this 4 day of d g 4 % , 1986, County of Santa Barbaraf ss before me, the undersigned Notary PuBlic, personally appeared $ @ e gt h. K po es ,
proved to me on the oath of $9gpg A .KAces to be the person whose name subscribed to the within instrument and acknowledged that h e, __ executed the same for the purposes therein contained.
.IN WITNESS Wi!EREOF, I hereunto set my hand and
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oppt% M> i official seal.
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