ML17181A174

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Univ. of California-Davis/McClellan - Copy of Corrected 2015 Annual Report
ML17181A174
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Site: University of California-Davis
Issue date: 12/31/2015
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McClellan Nuclear Research Center
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Office of Nuclear Reactor Regulation
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2015 ANNUAL REPORT Docket Number 50-607 License Number R-130 UCD/MNRC ANNUAL REPORT FOR 2015 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 TRIGAŽ 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 2015. 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 commercia l activities

. All four bays are capable of using radiography film techniques

, but Bays l and 3 normally use electronic imaging devices.

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 UCO 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. UCD!MNRC Annual Report 2015 1 MNRC$ L'luCl.UW!

lf.,;.u.11 UCD/MNRC ANNUAL REPORT FOR 2015 4.0 Facility Modifications (Section 50.59 of lOCFR Part 50), and experiments.

1. Performed 50.59 review for Experiment K-4-46 to include Directional Destruct Charges for Neutron Radiography

. 2. Performed 50.59 review for Experiment K-4-52 to perform Neutron Irradiation of Special Nuclear Material.

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 audit the week of 09 February 2015. No significant findings reported.

b. The Nuclear Regulatory Commission conducted an audit the week of 6 July 2015. No significant findings reported.
c. The Nuclear Regulatory Commission conducted an audit the week of 19 October 2015. No significant findings reported. d. Nuclear Regulatory Commission Examiner granted one Reactor Operator License effective 28 January 2015. e. One Reactor Operator License terminated effective 26 May 2015. f_ On 3 June 2015 the Nuclear Regulatory Commission requested additional information concerning the LAR submitted 15 July 2011. 6.2 Nuclear Safety Committee (UCD/NSC)
a. The Nuclear Safety Committee held its semi-annual meetings on 26 February and 23 July 2015. b. The Nuclear Safety Committee performed an Operations audit on 28 October 2015. c. The Nuclear Safety Committee performed an audit of the Radiation Safety Program on 23 November 2015. d. The Nuclear Safety Committee performed a Security audit on 14 December 2015. 7.0 OPERATIONS OPERATING HISTORY: TOTAL OPERATING HOURS THIS YEAR: 1055.73 TOTAL OPERATING HOURS: 49472.06 TOTAL MEGAWATT HOURS THIS YEAR: 961.70 TOTAL MEGAWATT HOURS: 64217.14 TOTAL NUMBER OF PULSES PERFORMED THIS YEAR: 0 TOTAL NUMBER OF PULSES PERFORMED
484 UCD/MNRC Annual RtlPOrt.

20 7 5 2 UCD/MNRC ANNUAL REPORT FOR 2015 7.1 UNSCHEDULED REACTOR SHUTDOWNS and NOTED PROBLEM AREAS: In 2015, there were three(3) unscheduled shutdowns at the MNRC reactor facility. The following is a list of the unscheduled shutdowns

2015 UNSCHEDULED REACTOR SHUTDOWNS Type of Failures Total Number csc Other TOTAL NUMBER OF UNSCHEDULED SHUTDOWNS IN 2015 1 2 3 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec csc 0 0 0 0 0 0 Other 0 0 1 1 0 0 Notes 1 Notes: 1: Loss of off-site power due to weather (lightning strikes in the area) 2: Control Room Overheated due to loss of air conditioning January 0 0 0 1 0 0 0 0 2 1. There were no unscheduled shutdowns in the month of January. 2. There was one callback to the facility in January. 0 0 0 0 a. Rod Withdrawal Prohibit (RWP) alert, cleared on acknowledgement

. February March 1. There were no unscheduled shutdowns in the month of February.

2. There were no callbacks to the facility in February. 1. There was one unscheduled shutdown in the month of March. a. Loss of building power. (Off Site Power). 2. There were two callbacks to the facility in March. a. Both were Rod Withdrawal Prohibit (RWP)alerts that cleared on acknowledgement
1. There was one unscheduled shutdown in the month of April. a. Loss of Off Site Power due to lightning

. 2. There were no callbacks to the facility in the month of April. 1. There were no unscheduled shutdowns in the month of May. 2. There were no callbacks to the facility in the month of May. UCD/MNRC AnnuM R.,,ort 2015 3 l :vi MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015 June August 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. Stack CAM blower power failure. 1. There were no unscheduled shutdowns in July. 2. There were two callbacks to the facility in the month of July. a. Cooling Tower High Water Level due to switch failure. 1. There were no unscheduled shutdowns in the month of August. 2. There were two callbacks to the facility in the month of August. a. Rod Withdrawal Prohibit alert. Cleared on acknowledgement

. b. Stack CAM fault, cleared on acknowledgement.

September

1. There were no unscheduled shutdowns in the month of September:
2. There were no callbacks to the facility in the month of September

. October 1. There was one unscheduled shutdown in the month of October. a. Control Room Overheat, Anomaly -Loss of Rod control.

2. There were two callbacks to the facility in the month of October. a. CSC-DIS064 timeout. b. Rod Withdrawal Prohibit alert, cleared on acknowledgement

. 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. UPS fault. Cleared on acknowledgement
b. Loss of Site Power. December
1. There were no unscheduled shutdowns in December.
2. There was one callback to the facility in the month of December. a. Rod Withdrawal Prohibit alert, cleared on acknowledgement

. UCD/MNRC Annual Report 2015 4 UCD/MNRC ANNUAL REPORT FOR 201.5 7.2 ANOMALIES

During 2015, there was 1 reported anomaly at the MNRC facility and no Radiological Incident Investigations. The specifics are listed below: There was one anomaly reported in the month of October. The report is as follows:

Anomaly Report For: AC-10 Failure Time: Unknown 10/4/15 (Sunday)

Reactor conditions prior to the anomaly and what occurred during the anomaly:

Rx was shut down for the weekend. At 2151 on Sunday, 10/4, the console alarmed for "Scram CSC-DIS064 Timeout". SRO responded (see log entry 10/4/15 2300). Upon opening on Monday morning, the control room was 84°F instead of 72°F and the console was alarming; alarms would not acknowledge; rebooting the console did not fix the problem; placed the console in Utilities mode. It was noted at the Temperature Control Panel that AC-10, the unit that cools the Control Room, was not running. A portable fan was brought in to provide temporary cooling.

Inspection of AC-10 showed the unit on, the condenser fan was not running and fan and housing were very hot to the touch. The unit was shut off at its local disconnect

. After about 30 seconds, it was attempted to restart the unit, which it did not. The unit was left off. After discussion with the building

manager, it was suggested to try restarting after the unit had been off for 10 minutes.

At this time, the unit had been off approximately 20 minutes. Before restarting, the fan was spun manually to be sure it would move, which it did. The unit was restarted successfully.

The control room immediately began to cool off. When the temperature reached 76°F, the console was returned to normal. All unusual alarms cleared.

A Startup Checklist was performed successfully.

The reactor was started at 0922 to 1 MW for radiography

. At 1330, the contractor arrived to repair the AC unit. After determining that radiography required only about 15 minutes more, the AC unit was shut off for repairs.

At 1400, prior to hourly readings, the control rods were leveled successfully

. At 1430, the reactor was attempted to be shutdown normally.

At this time, the temperature in the control room was up to 79°F. The reactor mode was switched to Manual, and all six control rods Down buttons were pressed. Shim 2 began to drive in, but the other rods did not appear to move. The reactor was manually scrammed from the console, and the direct reading instruments showed the reactor was shut down. Visual inspection confirmed the magnets were indeed all down, but the indications on the console were frozen. UCD/MNRC Annulll RllpOrt 2015 5 UCD/MNRC ANNUAL REPORT FOR 2015 7.3 January February March At 1545, the repairs on AC-10 were competed, the unit restarted, and the control room was cooled down to normal. The console responded

normally, and once the key was used to energize the magnets, all indications returned to normal. A Prestart Check was performed successfully.

Actions to correct the Anomaly:

Contractor was sent to troubleshoot unit. Portable fan was used to cool the control room during repairs. Actions to prevent reoccurrence:

Contractor replaced units' condenser motor/starting capacitor and controller.

MAINTENANCE OTHER THAN PREVENTIVE:

System# Description Work Performed 5350 Electrical Power Repair/Replace Emergency lights in several places Distribution System# Description Work Performed 5490 Helium Supply Replaced expended He supply bottle System System# Description Work Performed 5120 Demineralizer Changed out Makeup Water Tank inlet resin System bottles.

5170 Auxiliary Makeup Changed out AMUWS system resin bottles Water System 5490 Helium Supply Replaced expended He supply bottle System 1803 Rad-Vac DOP test Radiological Vacuum Cleaner 1800 Reactor Ventilation DOP test Reactor Room Exhaust HEPA filters UCD/MNRC Annual R'l'Ort 2015 6 June August UCD/MNRC ANNUAL REPORT FOR 2015 System# Description Work Performed Replaced Stack CAM Photohelic, replaced 0-ring 1001 Stack CAM and tightened mechanical joints in airstream piping to resolve flow issue. 5750 Facility General Replaced faulty Reactor Room entry door lock mechanism.

System# Description Work Performed 1001 Stack CAM Replaced Stack CAM motor fuse holder 5750 Facility General Replaced broken light fixture on roof (stack) 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: $1.88 Shim 3: $2.87 Shim 1: $2.70 Shim 4: $2.98 Shim 2: $2.49 Regulating Rod: $2.80 Control Rod Scram Drop Times: Transient Rod: 0.37 sec Shim 1: 0.39 sec Shim 2: 0.37 sec Shim 3: 0.40 sec Shim 4: 0.39 sec Regulating Rod: 0.39 sec Shutdown Margin: $5.96 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: 104% indicated, NM-1000: 104% indicated.

System# Description Work Performed 5720 Security System Replaced broken threaded rod in latching mechanism on Reactor Room door. 5310 Control System Replaced CSC HiRes monitor Console (CSC) UCD/MNRC Annual R9PQrt 2015 7

L. MNRC$ UCD/MNRC ANNUAL REPORT FOR 201.5 7.4 September System# Description Work Performed 5490 Helium Supply Replace expended He supply bottle 5640 Building Ventilation Replaced the through wall fan between the Demin System Cage and the CAM room. October System# Description Work Performed 5640 Building Ventilation Troubleshot and repaired AC-10 (Control Room System unit) 5640 Building Ventilation Replaced HV-3 fan belt. System December System# Description Work Performed 5640 Building Ventilation Replaced EF-3 Prefilter System 5720 Security System Replaced failed Keypad at East gate 5490 Helium Supply Replaced expended He supply bottle 5120 Demineralizer Replaced depleted resin bottles System Training January 1. All licensed operators and trainees completed Administrative Controls, Procedures and Regulations training. February March 1. All licensed operators completed Facility Design and Operating Characteristics and Instrumentation and Control Training. 1. No scheduled training in March. 1. All facility personnel attended ALARA/Safety/Security training. 2. Hosted and conducted training for University of California Berkeley Nuclear Engineering classes. (Classroom and Practical Lab training) UCD/MNRC Annual Report 2015 8

"' UCD/MNRC ANNUAL REPORT FOR 20151 June August 1. No scheduled training for May. 1. Three Senior Reactor Operators completed Radiation Safety Training for Operators

1. All licensed and candidate operators successfully completed the Annual Operators Examination.
2. MNRC conducted summer school classes for the University COSMOS program. 3. One Senior Reactor Operator completed Radiation Safety Training for Operators. 4. All personnel completed Explosives Material Safety Training.
1. One Senior Reactor Operator completed Radiation Safety training for Operators. September
1. 3 licensed operators completed training on Technical Specifications. October 1. One Licensed Senior Reactor Operator completed training on Technical Specifications.

November

1. 3 Senior Reactor Operators completed training on Nuclear Theory 2. All Senior Reactor Operators participated in the 2015 Security drill. December
1. One Senior Reactor Operator completed training on Technical Specificat ions. 2. One Senior Reactor Operator completed training on Nuclear Theory. UCD/MNRC Annual Report 2015 9 MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015 Cl Operating Hours 4500 4000 3500 3000 --2500 ---f--2000 ------1500 ----------1000 1-1-1-1-f--f----f--1 f-------f--f----1-l-1-1-1-r I 500 -------------------------f--,..__ 0 I I UCD\AINRC Annual Report 2015 10 MNRC$ UCD/MNRC ANNUAL REPORT FOR 201SJ Unscheduled Reactor Shutdowns 2015 5 ------------0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ocsc 0 0 0 0 0 0 0 0 0 1 0 0 *Other 0 0 1 1 0 0 0 0 0 0 0 0 02015 Total 0 0 1 2 2 2 2 2 2 3 3 3 02014 Total 0 0 0 0 0 0 0 0 2 2 2 2 Months UCDIMNRC A,.,,,,.,

R_,r 2015 11 D UCD/MNRC ANNUAL REPORT FOR 2015 Reactor Hours (2015) Reactor Hours 2015 140 Vl L. 120 :J 0 I t: ro 100 ro O> QI ::E: "O c 80 ro O> c :;::; ro L. QI a. 60 0 .c ...., c 0 40 ::E: 20 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

  • 2015 Op-Hrs 84.98 77.8 84.94 69.25 61.7 102.2 99.51 88.52 90.5 121.85 80.53 93.95
  • 2015 Mw-Hrs 81.33 71.66 79.47 65.99 56.31 98.3 89.62 63.39 85.58 112.12 77.45 80.48
  • 2014 Op-Hrs 61.3 64.67 81.01 71.8 85.92 106.17 149.89 111.9 81.07 95.13 111.3 82.77
  • 2014 Mw-Hrs 66.46 63.92 80.64 63.89 75.2 99.86 143.34 104.96 77.15 87.37 106.09 63.98 UCOIMNRC Annul/I/

Report 2015 12 D YI MNRC* UCD/MNRC ANNUAL REPORT FOR 201.S Reactor Tank Irradiation Facilities 2015 13 12 11 10 9 8 7 6 5 4 3 2 I I I 1 11 II I I 11 1111 II 11 II II 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec a Pneumatic 3 3 0 0 0 4 1 3 1 1 0 4 *Silicon Fixture 0 0 2 2 1 0 0 1 0 2 0 1 o Central Facility 0 0 1 0 0 1 1 1 0 0 0 1 DArgon 1 0 0 0 0 0 0 0 0 0 0 0 *Neutron Irradlator 0 6 3 0 6 0 10 11 6 5 0 12 0 -UCDIMNRC Annual RtJpOtt 2015 13 UCD/MNRC ANNUAL REPORT FOR 2015 Bay Utilization (Shutter Operations) 2015 250 Ill 200 c 0 :w .!!! 'ti Ill 150 -... -... ... ---.. 0 ... u .0 100 E !:r I-:I z -': ** -:_,, 50 ---l I-.* I--*, ' r -L " B II " ,,, 0 -Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Bay 1 201 147 154 63 31 34 26 79 151 139 137 142 *Bay 2 88 100 45 57 117 159 132 42 69 119 56 92 DBay 3 0 0 0 2 1 2 1 0 0 0 0 0 DBay 4 0 0 0 0 0 4 1 0 0 0 0 0 Months Annual R_,r 2015 14 MNRC$ ! , E c 0 ., . 'ii s 'li j E , z 17S -150 r--125 I-100 r-7S --; so . 2S *:<* i 0 --DBay 1 *Bay 2 D8ay 3 D8ay 4 Jan 1S2 63 0 0 UCDWNRC Annual Report 2015 -; ' ,_.;. f Feb 107 42 0 0 UCD/MNRC ANNUAL REPORT FOR 2015 Bay Irradiation Requests Completed 2015 --; I **, -' ' L -L ; L :' " *' r *_.: ,--,:; Mu Apr May Jun Jul Aug Sep Oct Nov Dec 84 37 24 12 12 29 7S so 67 118 43 lS 66 64 64 28 48 90 34 Sl 0 2 1 1 0 0 0 0 0 0 2 0 0 1 0 0 1 0 0 0 -15 MNRC$ McCLELLAN NUCLEAR RESEARCH CENTER UCD/MNRC ANNUAL REPORT FOR 2015 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 2015. 8.2 Airborne Effluents Airborne radioactivity discharged during 2015 is tabulated in Table 1 below. TABLE 1 2015 SUMMARY OF AIRBORNE EFFLUENTS MONTH TOTAL EST.MAX AVG. FRACTION OF EST. DOSE 121 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 (l)(ll UNRESTRICTED AREA (ll CONSTRAINT PART. WITH AREA (ll FOR FORM HALF-LIFE UNRESTRICTED WITH > 8 DAYS AREA (l)(4l HALF-LIFE

>8 DAYS (Ci) (uCi/ml)

(%) (mrem) (%) (Ci) (uCi/ml)

JAN 2.18 1.23E-10 1.2% 7.48E-01 7.48% NONE NONE FEB 1.97 1.23E-10 1.2% 7.51 E-01 7.51% NONE NONE MAR 1.80 1.01E-10 1.0% 6.17E-01 6.17% NONE NONE APR 1.84 1.03E-10 1.0% 6.30E-01 6.30% NONE NONE MAY 1.11 6.17E-11 0.6% 3.76E-01 3.76% NONE NONE JUN 1.65 9.19E-11 0.9% 5.60E-01 5.60% NONE NONE JUL 1.92 1.07E-10 1.1% 6.53E-01 6.53% NONE NONE AUG 0.93 5.16E-11 0.5% 3.14E-01 3.14% NONE NONE SEP 1.20 6.67E-11 0.7% 4.06E-01 4.06% NONE NONE OCT 1.82 1.01E-10 1.0% 6.17E-01 6.17% NONE NONE NOV 1.02 5.69E-11 0.6% 3.46E-01 3.46% NONE NONE DEC 1.07 5.98E-11 0.6% 3.64E-01 3.64% NONE NONE TOT 18.50 NONE NONE AVG 1.54 8.75E-11 0.9% 0.53 5.32% (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 lE-8 (Appendix B, Table 2); (4) Constraint for dose is 10 mrem/year

[10CFR20.1101(d)]

UCOIMNRC Annu# Report 2015 16 McCLELLAN NUCLEAR RESEARCH CENTER 'f.I!co/MNRC ANNUAL REPORT FOR 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 2015 is summarized in Table 2 below. TABLE 2 2015 SUMMARY OF PERSONNEL RADIATION EXPOSURES NUMBER OF AVERAGE GREATEST AVERAGE GREATEST INDIVIDUALS TEDE INDIVIDUAL EXTREMITY EXTREMITY PER TEDE INDIVIDUAL (mrem) (mrem) (mrem) (mrem) FACILITY PERSONNEL<

1> 9 19 55 53 210 FACILITY 27 <1.0 1 *

  • USERS VISITORS 661 0.3 2 * * (1) Only 7 of the 9 facility radiation workers were employed at MNRC at the end of 2015.
  • Extremity monitoring was not required.

UCDWNRC Annual Report 2015 17 MNRC$ McCLELLAN NUCLEAR RESEARCH CENTER UCD/MNRC ANNUAL REPORT FOR 2015 10.0 Radiation Levels and Levels of Contamination Radiation levels and levels of contamination observed during routine surveys performed at the MNRC during 2015 are summarized in Table 3 below. TABLE 3 2015 SUMMARY OF RADIATION LEVELS AND CONTAMINATION LEVELS DURING ROUTINE SURVEYS AVERAGE HIGHEST AVERAGE HIGHEST (mrem/hr)

(mrem/hr)

(dpm/100cm

2) (dpm/100cm
2) 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> COMPOUND

<0.1 <0.1 <5000<1> <5000<1> EQUIPMENT RM 0.2<4> 50<5> <800<2> <800<2> DEMINERALIZER AREA 12.9<4> 320<5> <800<2> <800<2> REACTOR RM 2,7<4> 555<5> <800<2> <800<2> SILICON STORAGE SHED <0.1 <0.1 <5000<1> <5000<1> RADIOGRAPHY BAYS 0. 75<3> 480(&) <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. (6) 1 meter dose rate of beam port insert taken behind its shielding.

UCOIMNRC Annul/I/

Rt1port 2015 18 McCLELLAN NUCLEAR RESEARCH CENTER UCD/MNRC ANNUAL REPORT FOR 2015 11.0 Environmental Surveys Environmental surveys performed outside of the MNRC during 2015 are summarized in Tables 4 & 5 below. The environmental survey program is described in the MNRC Facility Safety Analysis Report. TABLE 4 2015 SUMMARY OF ENVIRONMENTAL TLD RESULTS {WITH NATURAL BACKGROUN0<

1> SUBTRACTED)

ON BASE (OFF SITE 1-20 & 64) ON SITE (SITES 50 -61 & 65-71) AVERAGE (mrem) 4 12 HIGHEST (mrem) 23 31 (1) Natural background assumed to be the off base (Sites 27-42) average of 29 mrem. UCD\MNRC Annual Report 2015 19 MNRC$ McCLELLAN NUCLEAR RESEARCH CENTER ANNUAL REPORT FOR 2015 TABLE 5 2015 SUMMARY OF RADIOACTIVITY IN WELL WATER AVERAGE HIGHEST ALPHA (pCi/I) <MDA <MDA BETA (pCi/I) 3.37 3.81 TRITIUM Cs-137 (pCi/I) (pCi/I) <MDA <MDA <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 1.35 2.19 Beta 1.75 2.00 Tritium 302 390 Cs-137 4.24 7 .69 UCD'rMNRC Annulll R.,,att 2015 20

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