ML19270F339
| ML19270F339 | |
| Person / Time | |
|---|---|
| Site: | 05000139 |
| Issue date: | 01/30/1979 |
| From: | WASHINGTON, UNIV. OF, SEATTLE, WA |
| To: | |
| Shared Package | |
| ML19270F336 | List: |
| References | |
| NUDOCS 7902060275 | |
| Download: ML19270F339 (3) | |
Text
..
4 Annual Report From the University of Washington Facility License R-73 A.
A Narrative Summary of Operating Experience for the Period January 1, 1978 - December 31, 1978 The University of Washington Nuclear Reactor was operated for 179 hours0.00207 days <br />0.0497 hours <br />2.959656e-4 weeks <br />6.81095e-5 months <br /> (baseline to shutdown) and generated 7372 KWH of energy.
The 117 ex-perimental runs consisted of sample irradiation for neutron activation analysis, isotope production, laboratory experiments, class demonstrations, anomaly detection experiments and calibrations.
B.
Unscheduled Shutdowns 1.
At power Date Power Level Cause March 8 12 KW Safety Amp. (b)
April 14 1W Safety Amp. (a)
July 7 95 KW Period scram when alarm reset.
Assumed relay noise feedthrough.
December 27 10 KW Safety Amp. (a)
(a) Trips result from photodiode isolation falling below operational level due to noise on 120 VAC line.
(b)
Set on wrong scale - better operator observation 2.
Not at power August 24 - September 10, 1978 Determined CIC on Log N noisy -
Replaced with identical model.
C.
Corrective and Preventive Maintenance Having Safety Significance 1.
Routine calibration and maintenance as scheduled 2.
Replaced CIC on Log N Channel with same model detector on September 8, 1978.
D.
Discussion of Changes Carried Out Pursuant to 10 CFR 50.59 1.
March 20, 1978 - Modification to Reactor Drain Line (see enclosure).
E.
Radioactive Releases to the Environs 1.
Emptied a retention tank (1440 gallons) to sanitary sewer with total activity of 0.03 microcuries on April 14, 1978.
2.
The Argon-41 released to the environments from the facility during 1978 was measured to be 9 curies.
790206 oa76-
F.
Environmental Surveys Outside the Facility Measurements performed by U of W Radiation Safety 1.
Measured with a Reuter Stokes pressurizei ion chamber.
(EPA unit on loan to state.)
Reactor at 90 kw Reactor shutdown Location Description micro R/hr micro R/hr 51 75 ft. SE of building 6.3 6.5 52 100 ft. NE of building 6.4 6.2 53 N side of building 10.2 6.0 54 40 ft. NW of building 9.4 7.8 55 20 ft. W of building 14.8 7.96 56 15 ft. S of building 9.3 8.25 Background measurements:
Nuclear Physics Lab 6.4 Physical Plant coal pile 5.9 2.
Film badge and TLD as reported by R.S. Landauer Jr. & Co. in millirem.
Location Starting Date Length of Exposure 30 days 60 days 90 days TLD FB TLD FB TLD FB 51 Dec. 15, 1977 M
M M
50 M
M
.12 M
M M
50 M
M 53 M
M M
50 M
M 54 M
M M
50 M
M 55 M
M M
30 M
M 56 30 M
M 50 M
M 51 Mar. 15, 1978 M
M M
M M
M 52 M
M M
M M
M 53 M
M M
M M
M 54 M
M M
M M
M 55 M
M M(C) M M
M 56 M
M M
M M
M (C) Reported beta dose of 110 mrem G.
There were no significant exposures for the year, i.e., above 500 mrem.
Film badges provided by R.S. Iandauer Jr. & Company.
20 March 1978 Letter to file (50.59)
Modification to Reactor Drain Line The 1-1/2 inch drain line, which provides a drain path from the graphite region between the fuel boxes to the process pit, is to be modifiel to provide access to Vertical liole No. 2 from the process pit.
A 1-1/4 inch hole is to be drilled through the 1 inch Aluminum support plate and the floor drain plate, both of which are directly under Vertical llole No. 2, and below the fuel boxes.
This modification does not change the drain path, and allows for single pass flow experiments in the reactor through Vertical llole No. 2.
This modification involves no changes in the technical speci-fications and does not involve an uareviewed safety question.
It has been reviewed by W.S. Chalk, C.C. Carrier, and W.P. Miller.
,