ML20003E185
| ML20003E185 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos Nuclear Center |
| Issue date: | 03/04/1981 |
| From: | Gilliland D GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20003E166 | List: |
| References | |
| NUDOCS 8104020452 | |
| Download: ML20003E185 (3) | |
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O GENERAL ELECTRIC NUCLEAR TEST REACTOR ANNUAL REPORT NO. 21 License R-33 Docket 50-73 l
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GENERAL ELECTRIC NUCLEAR TEST REACTOR ANNUAL REPORT N0. 21 I.
INTRODUCTION This Report summarizes the operation changes, tests, and experiments at the Nuclear Test Reactor (NTR) authorized pursuant to License R-33 and 10CFR50, Section 50.59 for the period January 1 through December 31, 1980.
II. GENERAL A.
The reactor was operated at or above critical for 1029 hcurs. A total of 319 startups were made, while a total of 11 scrams and 3 unscheduled shutdowns occurred.
B.
The average radiation exposure to facility personnel was 1.238 Rem in 1980.
C.
There was one occurrence at the NTR which required a report to the NRC during 1980.
(See Item IV.B'. ).
D.
A revised program to maintain the proficiency of licensed reactor operators and licensed senior reactor operators ("Requalification Program sor General Electric Nuclear Test Reactor" NED0-12724, May 1979) as accepted by the Nuclear Regulatory Commissica (NRC) was implemented.
E.
The NRC issued Amendment No.14 to Facility License No. R-33.
This amendment revised the Technical Specifications to include limits on total excess reactivity, manual poison sheet restraints, and experimental worth limits.
F..The NRC issued a Notice of Consideration of Application for renewal of Amended Facility Operating License.
III. ORGANIZATION There were no changes to the organizational structure at the NTR during 1980.
IV. CHANGES, TESTS, AND EXPERIMENTS APPROVED BY THE MANAGER, REACTOR IRRADIATIONS A.
Changes Pursuant to 1"'~R 50.59 (a), the Manager, Reactor Irradiations authorized five changes during 1980. These _ changes are briefly described below.
[
1.
Magnet Power Supply EUscripticn This change authorized operation with a 60 volt power supply to reglace the 90 volt power srpply normally used to supply current to the safety rod magnets.
Safety Analysis Operation with lower voltage and current is in the safe direction and has no adverse effect on operation.
2.
NTR Safety Rod Magnets Description This change authorized modification of the safety rod magnet cores to accommodate existing replacement bobbins.
Safety Analysis No significant changes in oper: ting parameters are contemplated.
The assemblies will be tested functionally in order to ensure that operating conditions are acceptable prior to reactor startup.
3.
NTR Primary Flow Orifice Description This change provides the authorization to relocate the primary ficw orifice from the existing horizontal run to a vertical run. This change is planned to improve flow indication as a result of air entrainment in the sensing lines.
Safety Analysis The primary flow rate will not be affected by this change.
4.
Ventilation Filter Housing Modification-Description This change replaced a wedging locking system with a system using locking ' screws to provide uniform squeezing action on the sealing surfaces of the filters.
Safety Analysis-No nuclear or industrial hazards are introduced by implementing this change. 4
5.
Secondary Cooling System Repair Description The secondary cooling system developed a potable water leak at a point outside the reactor cell beneath a cement floor near the building foundation. Because cf the location, it was impractical to repair the leak. This chant ! authorized the installation of a new 2-inch Polyvinyl-chloride, 'C)line.
Safety Analysis PVC has been used since 1976 in the reactor cell for air sampler stations and overflow lines with no sign of deterioration.
Routing of the line is such that if a leak should occur it is unlikely that the graphite would be wetted. This installation is considered tem-porary at this time.
B.
Tests Pursuant to 10CFR50.59(a), the Manager, Reactor Irradiations authorized one (1) new test in 1980. This test is described briefly below:
A special test was performed to verify alignment and proper operation of all safety rod disconnect switches following failure of one switch resulting in a reportable incident.
C.
Experiments No types of experiments were performed which were different from those already described in Section 7.0 of the Summary Safeguards Report for the General Electric Nuclear Test Reactor, APED-4444A or as specified in annual reports issued since the submittal of APED-4444A. A total of i
495 individual experiments were reviewed, approved, and performed in 1980.
V.
CONCLUSION l
'The overall operating experience of the Nuclear Test Reactor reflects another year of safe, efficient operation. We anticipate the operation of the reactor will continue on this-basis.
GENERAL ELECTRIC COMPANY Irradiation Processing-Operation By D. L. GFililand, Wanager Reactor Irradiations l -
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