ML25216A093
| ML25216A093 | |
| Person / Time | |
|---|---|
| Site: | Rhode Island Atomic Energy Commission |
| Issue date: | 08/04/2025 |
| From: | Goodwin C State of RI, Atomic Energy Comm |
| To: | Stamler B Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| Download: ML25216A093 (1) | |
Text
August 4, 2025 STATE OF RHODE ISLAND Rhode Island Atomic Energy Commission 16 Reactor Road Nanagansett, RI 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. Bradley Stamler, Project Manager
Dear Mr. Stamler:
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 401-87 4-2600.
Dr. Cameron Goodwin Director, RI NSC Enclosures (5)
Copy to:
Mr. Craig Bassett, USNRC Dr. John J. Breen, Chairman, NRSC Dr. Clinton Chichester, Chairman, RIAEC Dr. Nancy Breen, RIAEC Dr. Michael Oumano, RIAEC Dr. Yana K. Reshetnyak, RIAEC Dr. Benjamin Young, RIAEC Reactor Operating Statistics Technical Specification Section 6.7.1.1 Month Year Operating MWHof Hours Operation July 2024 33.95 34.93 August 2024 27.53 27.22 September 2024 31.40 21.71 October 2024 34.02 22.77 November 2024 28.87 29.21 December 2024 60.18 33.63 January 2025 39.92 29.01 February 2025 53.47 49.99 March 2025 41.12 38.40 April 2025 50.05 46.11 May 2025 34.00 31.39 June 2025 32.03 23.93 Total FY2025 466.53 388.30 MWH or 16.18MWD Total Energy Output Since Initial Criticality 69,701.11 MWH or 2904.21 MWD
ENCLOSURE 2 UNSCHEDULED SHUTDOWNS OR SCRAMS Technical Specification Section 6.7.1.2 Page 1 of 2 The following is a list of the unscheduled shutdowns or scrams that occurred during the 2024-2025 reporting period:
Note: False/spurious scrams were more frequent during this reporting period due to an issue with the Neutron Flux Monitor discriminator/bandpass filter circuit. It has since been repaired and has mitigated the frequency of these scrams.
Log book 68 Run # 9993 - Watchdog timer scram Run # 9993 - Spurious scram/Instrument Noise (x3)
Run # 9996 - Spurious scram/Instrument Noise Run # 9997 - Operator Error while selecting WR range Run # 9997 - Spurious scram/Instrument Noise Run# 10000 - Spurious scram/Instrument Noise Run # 10005 - Spurious scram/Instrument Noise Run# 10009 - Spurious scram/Instrument Noise (x3)
Run # 10011 - Spurious scram/Instrument Noise Run # 10012 - Spurious scram/Instrument Noise (x3)
Run # 10012 - Watchdog timer scram Run # 10017 - Spurious scram/Instrument Noise (x2)
Run # 10019 - Spurious scram/Instrument Noise (x7)
Run # 10019 - Short Period/Instrument Noise Run # 10022 - Spurious scram/Instrument Noise Run # 10024 - Spurious scram/Instrument Noise Run # 10026 - Watchdog timer scram (x2)
Run # 10027 - Operator Error (Scram button)
Run # 10027 - Short Period/Instrument Noise Run # 10029 - Spurious scram/Instrument Noise (x2)
Run # 10033 - NFM Overpower/Instrument Noise Run # 10034 - NFM Overpower/Instrument Noise (x2)
Run # 10034 - Short Period/Instrument Noise (x3)
Run # 10035 - Short Period/WOT/Instrument Noise Run # 10036 - Short Period/Instrument Noise (x2)
Run # 10038 - WR 1 Inst. Trouble/Instrument Noise Run # 10038 - NFM Overpower/Instrument Noise (x4)
Run# 10039 - NFM Overpower/Instrument Noise Run # 10039 - Short Period/Instrument Noise (x2)
Run # 10041 - NFM Overpower/Instrument Noise
Page 2 of 2 Run # 10041 - Operator Error (Power Level Sw)
Run # 10041 - Short Period/Instrument Noise (x2)
Run # 10042 - NFM Overpower/Instrument Noise (x2)
Run # 10044 - NFM Overpower/Instrument Noise (x3)
Run # 10044 - Short Period/Instrument Noise Run # 10045 - NFM Overpower/Instrument Noise Run # 1004 7 - Short Period/Instrument Noise Run # 10048 - NFM Overpower/Instrument Noise Run # 10048 - Short Period/Instrument Noise Run # 10049 - Short Period/Instrument Noise (x2)
Run # 10050 - Short Period/Instrument Noise Run # 10055 - Short Period/Instrument Noise Run # 10062 - Watchdog timer scram Run# 10071 - Instrument Noise Run # 10072 - Instrument Noise Run# 10074 -WR1 Inst. Trouble Run # 10077 - Watchdog timer scram Log book 69 Run# 10084 - WR1 Inst. Trouble Run # 10089 - Instrument Noise Run # 10098 - SS#4 COM fault Run# 10105-WR1 Inst. Trouble Run # 10114 - WR 1 Inst. Trouble (x2)
Run # 10115 - Instrument Noise Run# 10116 -WR1 Inst. Trouble Run # 10116 - Short Period/Instrument Noise Run# 10121 -Watchdog timer scram
ENCLOSURE 3 MAINTENANCE OPERATIONS Technical Specification 6.7.1.3 requires a listing of the major maintenance operations performed in the 2024-2025 reporting period including their impact upon the safe operation of the reactor and the reasons for the corrective maintenance.
No major or corrective maintenance performed.
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 2024-2025 reporting period.
A 10 CFR 50.59 evaluation was performed on the following facility changes:
Upgraded Reactor Scram Logic Annunciator Panel Replacement.
24 Volt DC Power Supply Replacement Note 50.59 reviews were approved by the Safety Committee.
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 deep doses in units of mrem are shown in the table below.
The second quarter of year 2025 reports are not available yet due to the vendor's reports were not ready.
LOCATION 2nd QTR 3rd QTR 4th QTR 1st QTR 2nd QTR 2024 2024 2024 2025 2025 Northeast Wall 29 0
5 12 No data Demineralizer Door 38 28 0
0 No data Heat Exchanger Door 23 31 39 35 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 deep 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 1.65 mrem. The dose received at the Heat Exchanger Door would be 3.2 mrem. The annual dose received at the Northeast wall would be 1.15 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 Three facility member exposures were greater than 500 mrems of extremity shallow dose due to handling of experiment samples. No member exposures were greater than 500 mrems deep dose. One non-staff member was above 100 mrem due to his research in the reactor facility.
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 10CFR20.3 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 3.33E-5 µCi/cc and 0.0333 of the limit.
The total Argon-41 release during the reporting period was 95.57 curies. The calculated effective dose equivalent for this release is 1.9 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-52). 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 3.062E+ 7 ml. The isotopes and their relative activities discharged are given below.
Radioisotope Total Activity Discharged (microcuries)
H-3 179724.60 C-14 744.51 Sb-124 345.35 Sb-122 799.50 1-124 0.69 Pb-214 72.34 Bi-214 82.35 K-40 176.58 Na-22 470.23 3 Technical Specifications, Section 3.7.2.1
COMPLY:V1.7.7/30/20251:08
40CFRPart61 NationalEmissionStandards forHazardousAirPollutants
REPORTONCOMPLIANCEWITH
THECLEANAIRACTLIMITSFORRADIONUCLIDEEMISSIONS
FROMTHECOMPLYCODEV1.7.
Preparedby:
RIAtomicEnergyCommission RINuclearScienceCenter 16ReactorRoad,Narragansett,RI02882
SanghoNam 4018749439
Preparedfor:
U.S.EnvironmentalProtectionAgency OfficeofRadiationandIndoorAir Washington,DC20460
COMPLY:V1.7.7/30/20251:08
2025Ar41Release
SCREENINGLEVEL4
DATAENTERED:
ReleaseRate Nuclide(curies/YEAR)
AR419.557E+01
Releaseheight35meters.
Buildingheight18meters.
Thesourceandreceptorarenotonthesamebuilding.
Buildingwidth18meters.
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
COMPLY:V1.7.7/30/20251:08
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 VEGETABLESis100meters.
DistancefromtheSOURCEtotheFARMproducing MILKis100meters.
DistancefromtheSOURCEtotheFARMproducing MEATis100meters.
NOTES:
Thereceptorexposedtothehighestconcentrationislocated 100.metersfromthesourceintheNEsector.
HegetshisVEGETABLESfromafarmlocated 100.metersfromthesourceintheNEsector.
HegetshisMEATfromafarmlocated 100.metersfromthesourceintheNEsector.
HegetshisMILKfromafarmlocated 100.metersfromthesourceintheNEsector.
Inputparametersoutsidethe"normal"range:
COMPLY:V1.7.7/30/20251:08
WindrosewindfrequencyisunusuallyLOW.
RESULTS:
Effectivedoseequivalent:1.9mrem/yr.
- Complyatlevel4.
ThisfacilityisinCOMPLIANCE.
ItmayormaynotbeEXEMPTfromreportingtotheEPA.
YoumaycontactyourregionalEPAofficeformoreinformation.
- ENDOFCOMPLIANCEREPORT**********