ML21195A096
| ML21195A096 | |
| Person / Time | |
|---|---|
| Site: | Rhode Island Atomic Energy Commission |
| Issue date: | 07/14/2021 |
| From: | Godwin C State of RI and Providence Plantations, Atomic Energy Commission |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML21195A096 (12) | |
Text
July 14, 2021 STATE OF RHODE ISLAND Rhode Island Atomic Energy Commission 16 Reactor Road Narragansett,Rl 02882-1165 Telephone# 401-874-2600 Docket No. 50-193 Document Control Desk U.S. Nuclear Regulatory Commission (NRC) 11555 Rockville Pike Rockville, Maryland 20852 Attn: Mr. Patrick Boyle, Project Manager
Dear Mr. Boyle:
This letter and the enclosures constitute the annual report required by the RINSC Technical Specifications (Section 6. 7.1). Enclosure 1 provides reactor operating statistics. Enclosure 2 provides information pertaining to unscheduled reactor shutdowns or scrams. Enclosure 3 discusses maintenance operations performed during the reporting period. Enclosure 4 describes changes to the facility carried out under the conditions of Section 50.59 of Chapter 10 of the Code of Federal Regulations. Lastly, Enclosure 5 summarizes the radiological controls information. If there are any questions regarding this information, please call me at 401-874-9437.
~~
Dr. Cameron Goodwin Director, RINSC Enclosures (5)
Copy to:
Mr. Craig Bassett, USNRC Dr. John J. Breen, Chairman, NRSC Dr. Clinton Chichester, Chairman, RIAEC Dr. Nancy Breen, RIAEC Mr. Howard Chun, RIAEC Dr. Yana K. Reshetnyak, RIAEC Reactor Operating Statistics Technical Specification Section 6.7.1.1 Month Year Operating MWH of Hours Operation July 2020 11.02 13.30 August 2020 8.05 3.80 September 2020 21.35 14.44 October 2020 23.22 21.80 November 2020 3.98 0.74 December 2020 0.0 0.0 January 2021 15.40 11.12 February 2021 40.12 53.17 March 2021 17.22 14.38 April 2021 26.75 30.09 May 2021 17.20 13.16 June 2021 16.62 18.12 Total FY2021 200.93 194.12 MWH or 8.09 MWD Total Energy Output Since Initial Criticality 68,303.68 MWH or 2845.99 MWD
ENCLOSURE 2 UNSCHEDULED SHUTDOWNS OR SCRAMS Technical Specification Section 6.7.1.2 Page 1 of 1 The following is a list of the unscheduled shutdowns or scrams that occurred during the 2020-2021 reporting period:
Date Run Log Page Cause Description No.
book 8/7/20 9627 65 134 Power Level Power level selector switch was not fully Selector Switch engaged at 2 MW. Reactor scrammed during start-up at 100 kW.
8/20/20 9628 65 135 WR CH2 Range Momentary loss of range selector for WR Selector channel2 2/16/21 9657 66 15 Short period Short period scram due to noise while scram raising SS#2. Reactor was not yet critical.
6/30/21 9688 66 48 Instrument Noise Momentary instrument noise caused scram during start-up.
ENCLOSURE 3 MAINTENANCE OPERATIONS Technical Specification 6.7.1.3 requires a listing of the major maintenance operations performed in the 2020-2021 reporting period including their impact upon the safe operation of the reactor and the reasons for the corrective maintenance.
During a start-up on October 23, 2020, it was noticed that CIC #1 could no longer be compensated properly. After several days of troubleshooting, the detector was removed from the pool and tested. The CIC was internally shorted and needed to be replaced. The CIC detector was replaced along with all of the wiring between the detector and drawer. A 50.59 evaluation was conducted and the reactor was restarted on January 13, 2021.
ENCLOSURE 4 FACILITY CHANGES -10CFR50.59 REVIEW Technical Specification 6.7.1.4 requires that we provide a listing and description of any 10 CFR 50.59 evaluations conducted during the 2020-2021 reporting period.
One 10 CFR 50.59 evaluation was performed in this reporting period. The evaluation addressed the failure and subsequent replacement of the CIC #1 which had internally shorted. The evaluation was reviewed by the Nuclear Reactor Safety Committee prior to resumption of operation.
ENCLOSURE 5 RADIOLOGICAL CONTROLS
- 1.
Environmental Surveys outside the Facility-Technical Specification 6.7.1.6 Quarterly TLD1 badges are deployed outside the reactor building in three separate locations. The quarterly doses in units of mrem are shown in the table below. The second quarter of year 2021 reports are not available yet due to the vendor's reports delay affected by COVID-19.
LOCATION 2nd QTR 3rd QTR 4th QTR 1st QTR 2nd QTR 2020 2020 2020 2021 2021 Northeast Wall 11 13 7
18 No data Demineralizer Door 28 17 12 58 No data Heat Exchanger Door 36 5
11 42 No data The general public does not frequent these locations and therefore occupancy factors may be used to approximate annual dose. The allowable annual external dose for whole body must be below 100 mrem per year. Assuming that the maximum time that a member of the general public would be present in one of these locations is 10 minutes per day, an occupancy factor of 0.025 can be used to obtain the annual dose that would be received by a member of the general public, in any of these areas.
The annual dose at the Northeast Wall, Demineralizer and Heat Exchanger Doors is dependent on the operations schedule of the reactor. Ignoring the fact that the dose rate is not present 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per day, and applying the occupancy factor of 0.0252, the annual dose that would be receive by an individual in the demineralizer room would be 2.875 mrem. The dose received at the Heat Exchanger Door would be 2.351 mrem.
The annual dose received at the Northeast wall would be 1.225 mrem. The variations from quarter to quarter and from previous reports are also due in part to movements of items within the reactor building during the fiscal year and varying use of the different irradiation facilities.
- 2.
Annual Exposures Exceeding 500 mrem for facility members, 100 mrem for non-staff members or 10 mrem for members of the general public - Technical Specification 6.7.1.7 Two facility member exposures were greater than 500 mrems of extremity shallow dose due to the handling of experiment samples.
1Thermoluminescent Dosimeter; Mirian Technology reads the dosimeters at minimum of 1 mrem.
2 Occupancy factor of 0.025 was used, from NCRP 147 for Outdoors, unattended parking lots, attics, stairways, unattended elevators, janitor's closets.
- 3.
Radioactive Effluents - Technical Specification 6.7.1.5 A. Individual gaseous effluent concentrations for each reactor operation are recorded on the Monthly Information Sheets (Form NSC-78). The concentration of radioactive materials in the effluent released from the facility exhaust stacks shall not exceed 1 E+05 times concentrations specified in 1 0CFR20, Appendix B, Table 2, when averaged over time periods permitted by 1 0CFR20. 3 Gamma spectroscopy of stack gas samples has shown that the principal gaseous effluent is Argon-41. The maximum concentration for this principle contaminant permitted under Technical Specifications is 1 E-8 µCi/cc x1 E+5 = 1 E-3 µCi/cc.
Average concentrations released during the year were 3.75E-5 µCi/cc and 0.0375 of the limit.
The total Argon-41 release during the reporting period was 52.52 curies. The calculated effective dose equivalent for this release is 2.2 mrem/year (COMPLY Code). The Comply Code report is attached.
B. Liquid effluent concentrations released to the environment are documented on the Sewer Discharge Report (NSC-09). Each release was approved prior to discharge with its pH being within the acceptable range and with the sum of the fractions of the respective radioisotopes per month being below the discharge limit of 1. For the reporting period, the total volume of discharge was 6.237E6 ml. The isotopes and their relative activities discharged are given below.
Radioisotope Total Activity Discharged (microcuries)
H-3 11388.762 C-14 58.94 Pb-214 10.56 Bi-214 15.555 K-40 2.21 3 Technical Specifications, Section 3.7.2.1
2021Ar41release
COMPLY:V1.7.7/12/20213:12
40CFRPart61 NationalEmissionStandards forHazardousAirPollutants
REPORTONCOMPLIANCEWITH
THECLEANAIRACTLIMITSFORRADIONUCLIDEEMISSIONS
FROMTHECOMPLYCODEV1.7.
Preparedby:
RIAtomicEnergyCommission RINuclearScienceCenter 16ReactorRoad,Narragansett,RI02882
SanghoNam 4018749439
Preparedfor:
U.S.EnvironmentalProtectionAgency OfficeofRadiationandIndoorAir Washington,DC20460 Page1
2021Ar41release
COMPLY:V1.7.7/12/20213:12
2021Ar41releasereport
SCREENINGLEVEL3
DATAENTERED:
ReleaseRate Nuclide(curies/YEAR)
AR415.252E+01
Releaseheight35meters.
Buildingheight18meters.
Thesourceandreceptorarenotonthesamebuilding.
Distancefromthesourcetothereceptoris100meters.
Buildingwidth18meters.
Defaultmeanwindspeedused(2.0m/sec).
DistancefromtheSOURCEtotheFARMproducing VEGETABLESis155meters.
DistancefromtheSOURCEtotheFARMproducing MILKandMEATis100meters.
NOTES:
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2021Ar41release Inputparametersoutsidethe"normal"range:
None.
RESULTS:
Effectivedoseequivalent:2.2mrem/yr.
- Complyatlevel3.
COMPLY:V1.7.7/12/20213:12
2021Ar41releasereport
SCREENINGLEVEL4
DATAENTERED:
Buildinglength20meters.
STACKDISTANCES,FILE:stackdata100.dat
Distance DIR(meters)
N100.0 NNE100.0 NE100.0 ENE100.0 E100.0 ESE100.0 SE100.0 SSE100.0 S100.0 SSW100.0 SW100.0 WSW100.0 W100.0 WNW100.0 NW100.0 NNW100.0 Page3
2021Ar41release
COMPLY:V1.7.7/12/20213:12
WINDROSEDATA,FILE:2016windrosedata2m.dat
Sourceofwindrosedata:2016Windrosedata Datesofcoverage:19541994 Windroselocation:Narragansett,RI Distancetofacility:155m
Percentcalm:0.05
WindSpeed FROMFrequency(meters/s)
N0.0622.00 NNE0.0582.00 NE0.0442.00 ENE0.0132.00 E0.0122.00 ESE0.0132.00 SE0.0582.00 SSE0.0492.00 S0.0582.00 SSW0.0842.00 SW0.1052.00 WSW0.0642.00 W0.0682.00 WNW0.0952.00 NW0.1042.00 NNW0.0682.00
DistancefromtheSOURCEtotheFARMproducing MILKis100meters.
DistancefromtheSOURCEtotheFARMproducing MEATis100meters.
NOTES:
Thereceptorexposedtothehighestconcentrationislocated 100.metersfromthesourceintheNEsector.
HegetshisVEGETABLESfromafarmlocated Page4
2021Ar41release 155.metersfromthesourceintheNEsector.
HegetshisMEATfromafarmlocated 100.metersfromthesourceintheNEsector.
HegetshisMILKfromafarmlocated 100.metersfromthesourceintheNEsector.
Inputparametersoutsidethe"normal"range:
WindrosewindfrequencyisunusuallyLOW.
COMPLY:V1.7.7/12/20213:12
RESULTS:
Effectivedoseequivalent:1.1mrem/yr.
- Complyatlevel4.
ThisfacilityisinCOMPLIANCE.
ItmayormaynotbeEXEMPTfromreportingtotheEPA.
YoumaycontactyourregionalEPAofficeformoreinformation.
- ENDOFCOMPLIANCEREPORT**********
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