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{{#Wiki_filter:2020 ANNUAL REPORT Docket Number 50-607 License Number R-130
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UCD/MNRC ANNUAL REPORT FOR 2020
: 1. Introduction The University of California, Davis, McClellan Nuclear Research Center (MNRC) consists of a research reactor, associated radiography and positioning equipment, and a wide variety of equipment to support broad-based research activities. This MNRC Annual Report is published each year in support of the license provided by the United States Nuclear Regulatory Commission (NRC).
The aforementioned license is for the operation of a steady-state TRIGA' reactor with pulsing and square wave capability.
It is the primary intent of this document to provide information relevant to the safe operation of the UCD/MNRC. A brief description of the MNRC facility and administration is followed by operational events and health physics information concerning this facility during CY 2020.
: 2. UCD/MNRC Facility Description The UCD/MNRC is located on the McClellan Industrial Park site; the reactor is housed in Building 258. The McClellan Industrial Park site is approximately 2600 acres, located eight miles northeast of Sacramento, California.
The UCD/MNRC facility is a three level 14,720 sq. ft. rectangular-shaped enclosure that surrounds a 2 MW research reactor. The UCD/MNRC provides four neutron beams to four bays for radiography and other research and commercial activities. All four bays are capable of using radiography film techniques.
Space, shielding and environmental controls are provided by the enclosure for neutron radiography operations performed on a variety of samples. Adequate room has been provided to handle the components in a safe manner.
In addition to the radiography bays, the UCD/MNRC reactor also has several in-core facilities ranging from a pneumatic tube system to a central irradiation facility.
For more detailed information on the UCD/MNRC project, the reader is referred to the UCD/MNRC Safety Analysis Report.
3.0  UCD/MNRC Administration UCD/MNRC Organization. The UCD/MNRC is licensed by the Nuclear Regulatory commission (NRC) to operate under the provisions of operating license R-130.
The University of California Regents have designated the Chancellor at UC Davis to be the license holder. The UCD Chancellor has in-turn delegated the Vice Chancellor for Research to be the licensee of record.
The UCD/MNRC is under the direction of the UCD/MNRC Director.
2
 
UCD/MNRC ANNUAL REPORT FOR 2020 4.0  Facility Modifications (Section 50.59 of 10CFR Part 50), and experiments.
: 1. K-4-53 (Sb source production in the Central Irradiation Facility (CIF)).
: 2. K-4-54 (P-32 source production in the CIF).
5.0  Approved Changes to Experiments None 6.0    Licensing and Regulatory Activities 6.1  NRC Items
: a. The Nuclear Regulatory Commission conducted a semi-annual inspection the week of 6 January 2020. No significant findings reported.
: b. The Nuclear Regulatory Commission conducted an inspection the week of 15 June 2020. No significant findings reported.
: c. One Senior Reactor Operator retired and his license was terminated.
: d. Licensing Renewal documentation was transmitted to the Nuclear Regulatory Commission on 10 July 2020 for 2 Senior Reactor Operators. They are currently in Timely Renewal.
6.2  Nuclear Safety Committee (UCD/NSC)
: a. The Nuclear Safety Committee held its semi-annual meetings on 6 March and 23 September 2020.
: b. The Nuclear Safety Committee performed an Operations audit for 2020 on 14 January 2021.
: c. The Nuclear Safety Committee performed an audit of the Radiation Safety Program on 9 November 2020.
: d. The Nuclear Safety Committee performed a Security audit on 23 October 2020.
7.0  OPERATIONS OPERATING HISTORY:
TOTAL OPERATING HOURS THIS YEAR:                                      1638.47 TOTAL OPERATING HOURS:                                              56186.73 TOTAL MEGAWATT HOURS THIS YEAR:                                      1549.28 TOTAL MEGAWATT HOURS:                                                70483.99 TOTAL NUMBER OF PULSES PERFORMED THIS YEAR:                                0 TOTAL NUMBER OF PULSES PERFORMED:                                        484 3
 
UCD/MNRC ANNUAL REPORT FOR 2020 7.1      UNSCHEDULED REACTOR SHUTDOWNS and NOTED PROBLEM AREAS:
In 2020, there was one (1) unscheduled reactor shutdown at the MNRC reactor facility. The following is a list of the unscheduled shutdowns:
2020 UNSCHEDULED REACTOR SHUTDOWNS Type of Failures                                                    Total Number CSC                                                                    0 Other                                                                  1 TOTAL NUMBER OF UNSCHEDULED SHUTDOWNS IN 2020                          1 Jan      Feb      Mar      Apr      May      Jun      Jul      Aug    Sep    Oct  Nov  Dec CSC          0        0        0      0          0        0        0      0        0    0    0    0 Other        0        0        0      0          0        0        1      0        0    0    0    0 Notes                                                              1 Notes:
1: Scram Database Timeout - Cleared on Rebooting the Control System Console (CSC) computer January
: 1. There were no unscheduled shutdowns in the month of January.
: 2. There were no callbacks to the facility in January.
February
: 1. There were no unscheduled shutdowns in the month of February.
: 2. There were no callbacks to the facility in February.
March
: 1. There were no unscheduled shutdowns in the month of March.
: 2. There was one callback to the facility in March.
: a. The Stack Continuous Air Monitor (CAM) experienced a momentary fault (Derivative Alarm) that cleared on acknowledgement.
April
: 1. There were no unscheduled shutdowns in the month of April.
: 2. There were no callbacks to the facility in the month of April.
May
: 1. There were no unscheduled shutdowns in the month of May.
: 2. There were no callbacks to the facility in the month of May.
June
: 1. There were no unscheduled shutdowns in the month of June.
: 2. There was one callback to the facility in the month of June.
: a. The Stack CAM was found to be in a fault, alert and alarm condition with all displayed indications normal. It appears that the Stack CAM rebooted itself.
4
 
UCD/MNRC ANNUAL REPORT FOR 2020 July
: 1. There was one unscheduled shutdown in July.
: a. Reactor Scram, caused by Database Timeout. Cleared on reboot.
: 2. There was one callback to the facility in the month of July.
: a. Callback due to loss of site power.
August
: 1. There were no unscheduled shutdowns in the month of August.
: 2. There no callbacks to the facility in the month of August.
September
: 1. There were no unscheduled shutdowns in the month of September.
: 2. There were two callbacks to the facility in the month of September.
: a. Callback due to a flock of birds flying through sensors.
: b. Callback due to momentary spike in Stack CAM indications October
: 1. There were no unscheduled shutdowns in the month of October.
: 2. There were no callbacks to the facility in the month of October.
November
: 1. There were no unscheduled shutdowns in the month of November.
: 2. There were two callbacks to the facility in the month of November.
: a. Fire Alarm caused by a failed smoke detector.
: b. Callback due to a Scram Database Timeout message. Cleared on reboot.
December
: 1. There were no unscheduled shutdowns in December.
: 2. There was one callback to the facility in the month of December.
: a. Scram Database Timeout. Cleared on reboot.
 
===7.2 ANOMALIES===
During 2020, there were no anomalies at the MNRC facility and no Radiological Incident Investigations.
5
 
UCD/MNRC ANNUAL REPORT FOR 2020 7.3        MAINTENANCE OTHER THAN PREVENTIVE:
January System #      Description                        Work Performed 5490      Helium Supply    Replace expended Helium Supply bottle March System #      Description                        Work Performed 1800    Reactor Ventilation  DOP test Reactor Room Exhaust HEPA filters 1803 Rad-Vac        DOP test Radiological Vacuum Cleaner 5490      Helium Supply    Replace expended Helium Supply bottle Stack CAM SCA      Replaced Stack CAM SCA card. Recalibrated the 1001 card        Argon Channel April System #      Description                        Work Performed 5490      Helium Supply    Replace expended Helium Supply bottle 5640            AC-9        Replaced AC-9 with new unit May System #      Description                        Work Performed 5490      Helium Supply    Replaced expended helium supply bottle NM-1000 Troubleshot and repaired NM-1000 Calibration Mode 5330    Calibration Mode 4 4 noise issue.
noise problem Reactor CAM fuse 1001                        Replaced failed Rx CAM fuse holder holder Fire System air    Replaced failed Fire system air compressor and the 5740 compressor      leaking inlet manifold to the fire suppression system June System #      Description                        Work Performed Demineralizer    Replaced 2 depleted Demineralizer System resin 5120 system resin bottles bottles 5490      Helium Supply    Replaced expended helium supply bottle 6
 
UCD/MNRC ANNUAL REPORT FOR 2020 July System #          Description                          Work Performed Pneumatic Transfer 5510                              Replaced failed EF-3 Blower motor System 5310      CSC Status Monitor    Replaced Failed CSC Status monitor 5490          Helium Supply      Replaced expended helium supply bottle August
: 1. MNRC completed the annual reactor maintenance shutdown during the month of August.
Technical Specification required periodic maintenance as well as general maintenance was performed.
: 2. Parametric values noted during testing are as follows:
Control Rod Worth:
Transient Rod: $1.84            Shim 1: $2.50          Shim 2: $2.36 Shim 3: $2.46                  Shim 4: $2.93          Regulating Rod: $2.69 Control Rod Scram Drop Times:
Transient Rod: 0.35 sec        Shim 1: 0.40 sec        Shim 2: 0.37 sec Shim 3: 0.42 sec                Shim 4: 0.39 sec        Regulating Rod: 0.41 sec Shutdown Margin: $6.38 The normal nuclear instrument calorimetric calibration was performed. Both the NPP channel and the NM-1000 channels of the Nuclear Instruments were satisfactory, and no adjustments were required.
At Power Scram values: NPP-1000: 107% indicated, NM-1000: 100% indicated.
September System #          Description                          Work Performed 5490          Helium Supply      Replaced expended helium supply bottle NM-1000          Replaced 2 IC sockets in the Cambelling Module.
5330 Cambelling Module      Retests Sat.
5330            NM-1000          Replaced leaking capacitor. Retest Sat.
7
 
UCD/MNRC ANNUAL REPORT FOR 2020 October System #    Description                    Work Performed CSC computer did not recover after UPS load test.
5330      CSC Computer Replaced CSC computer hard drive.
5490      Helium Supply  Replaced expended helium supply bottle November System #    Description                    Work Performed Reactor Room 5620                    Replaced failed EF-1 fan motor.
Ventilation December System #    Description                    Work Performed 5740    Smoke Detector  Replaced failed below deck smoke detector 5490      Helium Supply  Replaced expended helium supply bottle 7.4        Training January
: 1. Two Senior Reactor Operators completed training on Administrative Controls and Procedures.
: 2. Three Facility personnel received training on Emergency Drills and Basic Emergency Response.
: 3. Five Senior Reactor Operators participated in a Security Drill.
February
: 1. One Senior Reactor Operator completed training on Administrative Controls and Procedures March
: 1. One Senior Reactor Operator completed training on Administrative Controls and Procedures.
: 2. Five Senior Reactor Operators completed training on Facility Design and Operating Characteristics.
April
: 1. Facility personnel completed Annual ALARA and annual Safety/Security training.
: 2. One Senior Reactor Operator completed training on Administrative Controls and Procedures.
: 3. Four Senior Reactor Operators completed and passed the Biennial Requalification Exam.
8
 
UCD/MNRC ANNUAL REPORT FOR 2020 May
: 1. Facility personnel attended training for Document Changes.
June
: 1. Two Senior Reactor Operators completed their Biennial Medical exams.
: 2. One trainee received training on Building Cranes and rigging.
July
: 1. Facility personnel received training on changes to the Neutron Radiography training program.
August
: 1. All Senior Reactor Operators and one trainee completed Fuel and Fuel Handling training.
: 2. One trainee received training on Building Cranes and rigging.
September
: 1. No training was held in September.
October
: 1. All Senior Reactor Operators completed the Annual Operators Examination.
November
: 1. No training was held in November.
December
: 1. No training was held in December.
9
 
UCD/MNRC ANNUAL REPORT FOR 2020 Operating Hours 4500 4000 3500 3000 2500 2000 1500 1000 500 0
10
 
UCD/MNRC ANNUAL REPORT FOR 2020 Unscheduled Reactor Shutdowns 2020 5
0 Jan Feb  Mar    Apr  May    Jun        Jul Aug Sep Oct Nov Dec CSC        0  0    0      0    0      0          0  0  0  0  0  0 Other      0  0    0      0    0      0          1  0  0  0  0  0 2020 Total  0  0    0      0    0      0          1  1  1  1  1  1 2019 Total  0  1    1      1    1      1          1  1  2  2  2  2 Months 11
 
UCD/MNRC ANNUAL REPORT FOR 2020 Reactor Hours (2020)
Reactor Hours 2020 180 160 140 Monthly Operating and Megawatt Hours 120 100 80 60 40 20 0
Jan      Feb      Mar      Apr      May      Jun      Jul      Aug      Sep      Oct      Nov      Dec 2019 Op-Hrs  136.35  107.13  98.09    148.2    139.93  95.73    91.86    136.62  145.18  171.39  134.22  113.1 2019 Mw-Hrs  129.6    103.14  90.88    141.55    129.14  92.27    88.86    109.48  138.19  166.47  131.01  105.47 2020 Op-Hrs  141.13  139.59  143.91  162.94    126.65  164.58  134.47  126.58  145.45  156.43  123.64    73.1 2020 Mw-Hrs  137.89  128.17  138.42  158.99    122.86  150.92  131.01  105.7    135.8    149.36  120.04  70.12 12
 
UCD/MNRC ANNUAL REPORT FOR 2020 Reactor Tank Irradiation Facilities 2020 17 16 15 14 Number of Irradiations 13 12 11 10 9
8 7
6 5
4 3
2 1
0 Jan    Feb    Mar    Apr        May        Jun              Jul  Aug  Sep  Oct  Nov  Dec Pneumatic              0      1      0      0          0            0            0      0    0    0      1    0 Silicon Fixture        0      0      1      0          0            0            1      0    1    1      1    0 Central Facility        0      2      0      0          0            0            1      1    2    0      1    1 Argon                  0      0      1      0          1            0            0      0    0    0      0    0 Neutron Irradiator      0      3      4      0          1            16            0      0    0    5      1    3 Months 13
 
UCD/MNRC ANNUAL REPORT FOR 2020 Bay Utilization (Shutter Operations) 2020 500 450 400 Number of Irradiations 350 300 250 200 150 100 50 0
Jan  Feb    Mar  Apr  May  Jun      Jul        Aug  Sep  Oct  Nov  Dec Bay 1  306  318    337  437  301  349      379        256  278  364  277  277 Bay 2  403  340    285  429  246  286      306        155  207  342  220  95 Bay 3    0    0      1    0    1    0        7          5    2    0    0    1 Bay 4    0    0      0    62    59    55        51        39    35    23    32    1 Months 14
 
UCD/MNRC ANNUAL REPORT FOR 2020 Bay Irradiation Requests Completed 2020 200 175 150 Number of Irradiation Requests 125 100 75 50 25 0
Jan  Feb    Mar  Apr        May      Jun            Jul  Aug  Sep  Oct  Nov  Dec Bay 1  144  166    179  169        135      134              129  92    102  130  129  87 Bay 2  104  114    101  102        84      110              75    73    90    113  90    57 Bay 3  0    0      1      0          1        0              0      0    1    1      1    0 Bay 4  0    0      6    36          18        14              25    11    5    6      9    1 Months 15
 
UCD/MNRC ANNUAL REPORT FOR 2020 8.0    Radioactive Effluents A summary of the nature and amount of radioactive effluents released or discharged to the environment beyond the effective control of the MNRC, as measured at or prior to the point of such release or discharge, include the following:
8.1    Liquid Effluents No liquid effluents were released during 2020.
8.2    Airborne Effluents Airborne radioactivity discharged during 2020 is tabulated in Table 1 below.
TABLE 1 2020
 
==SUMMARY==
OF AIRBORNE EFFLUENTS MONTH      TOTAL    EST.MAX AVG. FRACTION OF    EST. DOSE (2)  FRACTION OF  TOT. EST. AVERAGE EST.      CONC. OF        APPLICABLE      FROM Ar-41      APPLICABLE  QUANTITY CONC. OF QUAN.        Ar-41 IN    10CFR20 Ar-41        FOR          10CFR20    OF ACT. PART. ACT.
Ar-41    UNRESTRICTED CONC. LIMIT FOR UNRESTRICTED            DOSE          IN    RELEASED RELEASED      AREA  (1)(3)  UNRESTRICTED        AREA (1)    CONSTRAINT      PART.      WITH AREA (1)                          FOR        FORM    HALF-LIFE UNRESTRICTED    WITH    > 8 DAYS AREA (1)(4) HALF-LIFE
                                                                                          >8 DAYS (Ci)        (uCi/ml)          (%)            (mrem)            (%)        (Ci)    (uCi/ml)
JAN        3.04    4.01E-07        1.8%            1.08E+00        10.75%          NONE      NONE FEB        3.02    4.27E-07        1.9%            1.14E+00        11.44%          NONE      NONE MAR        3.17    4.19E-07        1.8%            1.12E+00        11.23%          NONE      NONE APR        4.72    6.23E-07        2.7%            1.67E+00        16.69%          NONE      NONE MAY        2.14    2.83E-07        1.2%            7.58E-01        7.58%            NONE      NONE JUN        3.99    5.28E-07        2.3%            1.42E+00        14.15%          NONE      NONE JUL        3.24    4.30E-07        1.9%            1.15E+00        11.51%          NONE      NONE AUG        2.35    3.11E-07        1.4%            8.34E-01        8.34%            NONE      NONE SEP        3.30    4.38E-07        1.9%            1.17E+00        11.72%          NONE      NONE OCT        3.35    4.44E-07        2.0%            1.19E+00        11.89%          NONE      NONE NOV        2.36    3.12E-07        1.4%            8.37E-01        8.37%            NONE      NONE DEC        1.22    1.62E-07        0.7%            4.33E-01        4.33%            NONE      NONE TOT        35.91    4.78E-06                        12.80                            NONE      NONE AVG        2.99    3.98E-07        1.8%            1.07            10.67%
(1) This location is 240 meters downwind which is the point of maximum expected concentration based on the worst case atmospheric conditions (see MNRC SAR Chapter 11).
(2) Based on continuous occupancy and the calculation techniques used in Appendix A of the MNRC SAR (Ar-41 at 2.3E-10 uCi/ml continuous for one year equals 1.4 mrem).
(3) 10CFR20 Limit for concentration is 1E-8 (Appendix B, Table 2);
16
 
UCD/MNRC ANNUAL REPORT FOR 2020 (4) Constraint for dose is 10 mrem/year [10CFR20.1101(d)]
8.3    Solid Waste No solid radioactive waste was shipped this year.
9.0    Radiation Exposure Radiation exposure received by facility operations personnel, facility users, and visitors during 2020 is summarized in Table 2 below.
TABLE 2 2020
 
==SUMMARY==
OF PERSONNEL RADIATION EXPOSURES NUMBER OF    AVERAGE      GREATEST      AVERAGE        GREATEST INDIVIDUALS      TEDE      INDIVIDUAL    EXTREMITY      EXTREMITY PER        TEDE            (1)
INDIVIDUAL (mrem)      (mrem)                      (mrem)
(mrem)
FACILITY        11            23          105            420          807 PERSONNEL FACILITY        173          <1.0          1.0            *
* USERS VISITORS        395          <1.0          1.0            *            *
(1) Only 2 individuals received extremity exposure
* Extremity monitoring was not required.
17
 
UCD/MNRC ANNUAL REPORT FOR 2020 10.0  Radiation Levels and Levels of Contamination Radiation levels and levels of contamination observed during routine surveys performed at the MNRC during 2020 are summarized in Table 3 below.
TABLE 3 2020
 
==SUMMARY==
OF RADIATION LEVELS AND CONTAMINATION LEVELS DURING ROUTINE SURVEYS AVERAGE      HIGHEST    AVERAGE        HIGHEST (mrem/hr)    (mrem/hr) (dpm/100cm2)    (dpm/100cm2)
OFFICE SPACES                          <0.1        <0.1      <5000(1)        <5000(1)
REACTOR CONTROL RM                    <0.1        <0.1      <5000(1)        <5000(1)
RADIOGRAPHY CONTROL RM                <0.1        <0.1      <5000(1)        <5000(1)
COUNTING LAB                          <0.1        <0.1      <5000(1)        <5000(1)
STAGING AREA                          <0.1        <0.1      <5000(1)        <5000(1)
FACILITY (I/S Fence)                  <0.1        <0.1      <5000(1)        <5000(1)
EQUIPMENT RM                          0.75 (4)      98 (5)    <800(2)        <800(2)
DEMINERALIZER AREA                    16(4)        300(5)    <800(2)        <800(2)
REACTOR RM                            1.3(4)      710(5)    <800(2)        <800(2)
RADIOGRAPHY BAYS                      0.5(3)        270      <800(2)        <800(2)
(1) <5000 dpm/100 cm2 = Less than the lower limit of detection for a scanning survey.
(2) <800 dpm/100 cm2 = Less than the lower limit of detection for a swipe survey.
(3) Due to Bay 1 Storage Areas; all other areas and bays are significantly lower (typically <0.1 mrem/hr).
(4) General area dose rate.
(5) Maximum contact dose rate.
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UCD/MNRC ANNUAL REPORT FOR 2020 11.0 Environmental Surveys Environmental surveys performed outside of the MNRC during 2020 are summarized in Tables 4
    & 5 below. The environmental survey program is described in the MNRC Facility Safety Analysis Report.
TABLE 4 2020
 
==SUMMARY==
OF ENVIRONMENTAL TLD RESULTS (WITH NATURAL BACKGROUND(1) SUBTRACTED)
AVERAGE              HIGHEST (mrem)              (mrem)
ON BASE (OFF SITE 1-20 & 64)            3                  10 ON SITE (SITES 50 - 61 & 65-71)          15                  20 (1) Natural background assumed to be the off base (Sites 27-42) average of 42 mrem.
19
 
UCD/MNRC ANNUAL REPORT FOR 2020 TABLE 5 2020
 
==SUMMARY==
OF RADIOACTIVITY IN WELL WATER ALPHA    BETA      TRITIUM Cs-137 (pCi/l)  (pCi/l)    (pCi/l) (pCi/l)
AVERAGE      <MDA    1.37        <MDA      <MDA HIGHEST      <MDA    1.92        <MDA      <MDA MDA is the minimum detectable activity at the 95% confidence level.
The MDA range for the analyzed radionuclides (pCi/L).
MIN        MAX Alpha    2.94        3.2 Beta    1.7        1.92 Tritium    251        281 Cs-137    10.9        17.6 20}}

Revision as of 05:48, 8 September 2021

University of California, Davis, Mnrc 2020 Annual Report
ML21175A335
Person / Time
Site: University of California-Davis
Issue date: 12/31/2020
From:
McClellan Nuclear Research Center
To:
Office of Nuclear Reactor Regulation
Shared Package
ML21175A333 List:
References
Download: ML21175A335 (20)
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