ML16187A264
| ML16187A264 | |
| Person / Time | |
|---|---|
| Site: | University of California-Davis |
| Issue date: | 06/29/2016 |
| From: | Steingass W McClellan Nucleaer Research Center, McClellan Nuclear Research Center |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML16187A264 (21) | |
Text
5335 PRICE AVENUE, BUILDING 258 McCLELLAN, CA 95652 PHONE: (916) 614-6200 FAX: (916) 614-6250 UC DAVIS WEB: http://mnrc.ucdavis.edu MNRC McCLELLAN NUCLEAR RESEARCH CENTER SACRAMENTO, CA 95652 PHONE: (916) 614-6200 FAX: (916) 614-6250 29 June, 2016 United States Nuclear Regulatory Commission Attn: Document Control Desk US Nuclear Regulatory Commission Washington, D.C. 20555-001 Re: 2015 Annual Report for University of California Davis/ McClellan Nuclear Research Center, Docket No. 50-607, License No. R-130 To Document Control Desk:
Attached is the 2015 annual report for the McClellan Nuclear Research Center, submitted in accordance with the reporting requirements of the Technical Specifications document MNRC-0004-DOC-13 paragraph 6.7.1.
Thanks and Regards, y Steingass te Director for Operations, McClellan Nuclear Research Center
2015 ANNUAL REPORT Docket Number 50-607 License Number R-130
, :vis MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015
- 1. Introducti on The University of California, Davis , McClellan Nuclear Research Center (MNRC) consists o f a research reactor , associated radiography and positioning equipment , and a wi de variety of equipment to support broad- based research activities. This MNRC Annual Report is published each year in support of the li cense provided by the United States Nuclear Regulatory Commission (NRC) .
Th e aforementioned license is for the operation of a steady- state TRIGA' re actor 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 fa cil ity and administration is followed by ope rational 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 commercial acti v ities . All four bays are capable of using radiography film techniques, but Bays 1 and 3 normally use electronic imaging devices. Space, shielding and environmental controls are provided by the enclosure for neutron radi ogr aphy operat i ons performed o n 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 inf o rmati o n on the UCD/MNRC project, the reader is referred to the UCD/MNRC Safety Analysis Report.
3.0 UCD/MNRC Admini stration UCD/MNRC Organizat i on . The UCD/MNRC is li censed 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 dir ecti on of the UCD/MNRC Director.
IJCDIMNRC Annual R_,r 2015 1
UCD/MNRC ANNUAL REPORT FOR 2015 4.0 Facility Modifications (Section 50 . 59 of 10CFR Part 50), and experiments.
- 1. Performed 50 . 59 review f or Experiment K 46 to include Bi -
Directional Destruct Charges for Neutron Radiography .
- 2. Performed 50 . 59 review for Experiment K 52 to perform Neut r on Irradiati on of Special Nuclear Materia l.
5.0 Approved Changes to Experiments None 6.0 Licensing and Regulatory Activities 6.1 NRC Items a . The Nuclear Regulat ory Commission conduct ed a semi -a nnu al audit the week of 09 February 2015 . No significant findings repo rted.
b . The Nuclear Regulatory Commission conducted an audit the week o f 6 July 20 15. No significant findings reported.
c . The Nuclear Regulatory Commission conducted an audit the week of 19 Octobe r 20 15. No significant findings reported.
d . Nuclear Regulatory Commission Examine r granted one Reactor Operator License effective 28 Janua ry 20 1 5 .
e . On e Reactor Operator Li cense terminated effecti ve 26 May 20 1 5 .
- f. On 3 June 2015 the Nuclear Regulato ry Commissi o n requested additional information conce rning the LAR submitted 15 Jul y 20 11.
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 Operati ons audit on 28 Oc t obe r 20 1 5 .
- c. The Nuclear Safe t y Committee performed an audit of the Radiation Safety Program on 23 November 2015 .
- d. The Nuclear Sa f e t y Committee per f ormed a Security audit on 14 December 2015 .
7.0 OPERATIONS OPERATING HISTORY:
TOTAL OPERATING HOURS THIS YEAR : 1055.73 TOTAL OP ERATING HOURS : 494 72 . 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 UCO!MNRC Annual R-ft 2015 2
MNRC$ 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 UNSCH EDULED REACTOR SHUTDOWNS Type of Failures Total Number csc Other 2 TOTAL NUMBER OF UNSCHEDULED SHUTDOWNS IN 2015 3 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec csc 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 Notes 1 2 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 1 . There were no unscheduled shutdowns in the month o f January.
2 . There was one callback to the facility in January .
- a. Rod Withdrawal Prohibit (RWP ) alert, cleared on acknowl edgement .
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 was one unscheduled shutdown in the month o f March.
- a. Lo ss of bui l d ing power . (Off Site Power) .
2 . There were two callbacks to the fa cility in March .
- a. Both were Rod Withdrawal Prohibit (RWP)alerts that clea r ed on acknowledgement 1 . There was one unscheduled shutdown in th e month of April .
a . Los s of Off Site Power due to lightning.
2 . There we r e no callbacks to the facility in the month o f April.
1 . There we r e no unsch e duled shutdowns in the month o f May.
2 . There were no callbacks to the facility in the mo nth of May .
UCDIMNRC Annual Report 2015 3
MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015 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 . 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 .
August 1 . There were no unscheduled shutdowns in the month of August.
2 . There were two ca llbacks to the faci l ity i n the month of Augu s t .
- a. Rod Withdrawal Prohibit alert . Cleared on acknowledgement .
b . Stack CAM fault , c l eared on acknowledgement .
September 1 . There were no unscheduled shutdowns in the month of September :
2 . There were no cal lbacks 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 i n the month of Octobe r .
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 .
UCDIMNRC Annual R_,i 2015 4
MNRC~ UCD/MNRC ANNUAL REPORT FOR 2015
7.2 ANOMALIES
During 2015 , there was 1 report ed anomaly at the MNRC f acility and no Radiological Incident I nvestigations . The specifics ar e listed be l ow :
There was one anomaly repo rted i n the month of October . Th e r epo rt i s as fol l ows :
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 Report 2015 5
UCD/MNRC ANNUAL REPORT FOR 2015 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 Presta rt Check was performed successfu Ily.
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.
7.3 MAINTENANCE OTHER THAN PREVENTIVE:
January System# Description Work Performed Electrical Power 5350 Repair/Replace Emergency lights in several places Distribution February System# Description Work Performed Helium Supply 5490 Replaced expended He supply bottle System March System# Description Work Performed Demineralizer Changed out Makeup Water Tank inlet resin 5120 System bottles.
Auxiliary Makeup 5170 Changed out AMUWS system resin bottles Water System Helium Supply 5490 Replaced expended He supply bottle System 1803 Rad-Vac DOP test Radiological Vacuum Cleaner 1800 React or Ventilation DOP test Reactor Room Exhaust HEPA filters UCD/MNRC Annual R-11 2015 6
MNRC$ UCD/MNRC ANNUAL REPORT FOR 201.5 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.
Replaced faulty Reactor Room entry door lock 5750 Facility General mechanism.
June System# Description Work Performed 1001 Stack CAM Replaced Stack CAM motor fuse holder 5750 Facility General Replaced broken light fixture on roof (stack)
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: $1.88 Shim 1: $2.70 Shim 2: $2.49 Shim 3: $2.87 Shim 4: $2.98 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: $5.96 The normal nuclear instrument calorimetric calibration was performed. Both the NPP channel and the NM-1000 channels of the Nuclear Instruments were satisfactory, and no adjustments were required.
At Power Scram values: NPP-1000: 104% indicated, NM-1000: 104% indicated.
System# Description Work Performed Replaced broken threaded rod in latching 5720 Security System mechanism on Reactor Room door.
Control System 5310 Replaced CSC HiRes monitor Console (CSC)
UCD/MNRC Annullll Report 2015 7
MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015 September System# Description Work Performed 5490 Helium Supply Replace expended He supply bottle Building Ventilation Replaced the through wall fan between the Demin 5640 System Cage and the CAM room.
October System# Description Work Performed Building Ventilation Troubleshot and repaired AC-10 (Control Room 5640 System unit)
Building Ventilation 5640 Replaced HV-3 fan belt.
System December System# Description Work Performed Building Ventilation 5640 Replaced EF-3 Prefilter System 5720 Security System Replaced failed Keypad at East gate 5490 Helium Supply Replaced expended He supply bottle Demineralizer 5120 Replaced depleted resin bottles System 7.4 Training January
- 1. All licensed operators and trainees completed Administrative Co ntrols, Procedures and Regulations training.
February 1 . All licensed operators completed Facility Design and Operating Characteristics and Instrumentation and Control Training .
March
- 1. No scheduled training in March.
- 1. All facility personnel attended ALARA/Safety/Security training .
2 . Hosted and c o nducted training for University of California Berkeley Nuclear Engineering classes. (Classro om and Practical Lab training)
UCDIMNRC Annual Report 2015 8
UCD/MNRC ANNUAL REPORT FOR 2015
- 1. No scheduled training for May.
June 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.
August
- 1. One Senior Reactor Operator completed Radiation Safety train i ng f or 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 Ope r ators completed training on Nuclear Theory 2 . All Senior Reactor Operators participated in the 2015 Securi ty drill.
December 1 . One Senior Reactor Operator completed training on Technical Specifications .
- 2. One Senior Reactor Operator completed training on Nuclear Theory.
UCDIMNRC AntHJ-
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UCDIMNRC Annulll Report 2015 10
MNRC$
L1'a.ULNI lf.~B.~ lft5l.\1 "::"- ll' UCD/MNRC ANNUAL REPORT FOR 2015 Unscheduled Reactor Shutdowns 2015 5
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MNRC~ UCD/MNRC ANNUAL REPORT FOR 2015 Reactor Hours (2015)
Reactor Hours 2015 140
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- 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 UCDIMNRCAnnual Repott 20 15 12
MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015 Reactor Tank Irradiation Facilities 2015 13 12 11 I 10 9
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- 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 D Argon 1 0 0 0 0 0 0 0 0 0 0 0
- Neutron lrradlator 0 6 3 0 6 0 10 11 6 5 0 12 0
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IJCDIMNRC Annu#I R_, 2015 13
MNRC$ UCD/MNRC ANNUAL REPORT FOR 2015 Bay Utilization (Shutter Operations) 2015
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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 14
MNRC$
- 1'a.ULIJI If.~>>-~ ll'c!5l.A":l<~~ 1 1.l'! UCD/MNRC ANNUAL REPORT FOR 2015 Bay Irradiation Requests Completed 201.5 175 ~---------------------------------------------------------------------,
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UCDIMNRC Annual R_,i 2 015 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 <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 3 AREA CllC l UNRESTRICTED CONSTRAINT PART. WITH AREA Cll AREA Cll FOR FORM HALF-LIFE UNRESTRICTED WITH > 8 DAYS AREA CllC 4 l HALF-LIFE
>8 DAYS (Ci) (uCi/ml) (%) (mrem) (O/o) (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 1.01 E-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)]
UCDIMNRC AnfH.111Report2015 16
MNRC$
McCLELLAN NUCLEAR RESEARCH CENTER UCD/MNRC ANNUAL REPORT FOR 2015 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 9 19 55 53 210 PERSONNELC 1 >
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.
UCD\MNRC Annu# Repolt 2015 17
MNRC$
McCLELLAN NUCLEAR RESEARCH CENTER UCD/MNRC ANNUAL~EPORT 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) 60< 5 > <800< 2 > <800< 2 >
DEMINERALIZER AREA 12.9<4> 320< 5 > <800< 2 > <800< 2 >
REACTOR RM 2. 7< 4> 665( 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 cm 2 = 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.
UCD'MNRC Annulll R-rt 2015 18
MARC$
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)
AVERAGE HIGHEST (mrem) - - - -(mrem)
ON BASE (OFF SITE 1-20 & 64) 4 23 ON SITE (SITES 50 - 61 & 65-71) 12 31 (1) Natural background assumed to be the off base (Sites 27-42) average of 29 mrem.
UCDIMNRC Annual R-rt 2015 19