Text

Annual Radioactive Effluent Release Report for the Period of January 1 Through December 31, 2015
	ML16089A293
Person / Time
Site:	Rancho Seco
Issue date:	03/10/2016
From:	Tallman D; Sacramento Municipal Utility District (SMUD)
To:	Jack Parrott; Office of Nuclear Material Safety and Safeguards
References
	DPG 16-053
	Download: ML16089A293 (21)
	v • d • e

i Powering forward. Together.

March 10, 2016 DPG 16-053 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2015 Attention: Jack Parrott In accordahce with 10 CFR 50.36a(a)(2) and Rancho Seco Quality Manual (RSLBD-010), Appendix A, Section 1.5.3, we are submitting the Rancho Seco 2015 Annual Radioactive Effluent Release .Report for the period of January 1 through-December.31, 2015.

If you or members of your staff have questions requiring additional information or clarification, please.contact me at (916) 732-4893.

Sincerely, Dan A. Tallman Manager, Rancho Seco Assets Enclosures (

Attachment:

Rancho Seco Annual Radioactive Effluent Release Report for 2015)

Cc: NRC, Region IV w/Attachment DPG Chron w/ Attachment RIC 1F.099 & 1L.320 (Report only)

Ranc:ho Sec:o Nuc:lear Generating Station I 14440 Twin Cities Road I Herald, CA 95638-9799 I 1.209.333.2935 I smud.org

RANCHO SECO NUCLEAR GENERATING STATION LICENSE NUMBERS DPR-54 and SNM-2510 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE OF CONTENTS INTRODUCTION ........................................................................................................................................... 1 I. SUPPLEMENTAL INFORMATION .................................................................................................. 2 A. Regulatory Limits & Guidelines for Effluent Releases ......................................................... 2 B. Maximum Effluent Concentrations ...................................................................................... 3 C. Measurement Methods for Total Radioactivity .................................................................... 3 D. Batch Releases (via monitored pathways) ......................................................................... .4 E. Unplanned Releases ........................................................................................................... 5 F. Radioactive Effluent Monitoring Instrumentation Inoperable for Greater Than 30 Days ....................................................................................................................................5 II. ESTIMATION OF ERROR ............................................................................................................... 6 Ill. GASEOUS EFFLUENTS .................................................................................................................. 7 TABLE Ill-A: GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES .................................. 8 TABLE 111-B: GASEOUS EFFLUENTS- GROUND LEVEL RELEASES ......................................... 9 TABLE 111-C: GASEOUS EFFLUENTS -TYPICAL LOWER LIMITS OF DETECTION ................. 10 TABLE 111-D: RADIOLOGICAL IMPACT ON MAN DUE TO GASEOUS EFFLUENT RELEASES ........................................................................................................................ 11 IV. LIQUID EFFLUENTS ...................................................................................................................... 12 TABLE IV-A: LIQUID EFFLUENTS-SUMMATION OF ALL RELEASES ..................................... 13 TABLE IV-B: LIQUID EFFLUENTS ................................................................................................ 14 TABLE IV-C: LIQUID EFFLUENTS-TYPICAL LOWER LIMITS OF DETECTION ....................... 15 TABLE IV-D: RADIOLOGICAL IMPACT ON MAN DUE TO LIQUID EFFLUENT RELEASES ........................................................................................................................ 16 V. SOLID WASTE ............................................................................................................................... 17 ATTACHMENTS None

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY- DECEMBER 2015 INTRODUCTION Rancho Seco Nuclear Generating Station (RSNGS) Unit No. 1 is located in Sacramento County, California approximately 25 miles southeast of Sacramento and 26 miles north-northeast of Stockton.

Rancho Seco Unit No. 1 began commercial operation on April 17, 1975. The single unit on the Rancho Seco site was a pressurized water reactor supplied by Babcock and Wilcox. The rated capacity was 913 megawatts electrical. Because of a public vote on June 6, 1989, Sacramento Municipal Utility District (SMUD) shutdown the Rancho Seco Nuclear Generating Station and completed defueling operations on December 8, 1989. Transfer of the spent fuel rod assemblies from the Spent Fuel Pool into dry storage at the Independent Spent Fuel Storage Installation (ISFSI) was completed on August 21, 2002.

Radiological dismantlement of the nuclear facility was completed in December 2008 and the release of the Rancho Seco property, except for the area associated with the Interim Onsite Storage Installation (IOSB), from NRC license DPR-54 was approved on September 25, 2009. With the completion of Phase I of decommissioning, the facility is in a SAFSTOR-type condition awaiting a suitable disposal option for the low-level radioactive waste in storage in the IOSB.

This Annual Radioactive Effluent Release Report (ARERR) provides a summary of gaseous and liquid effluent releases made from Rancho Seco during the period of January 1 through December 31, 2015.

This report also provides a summary of solid radioactive waste shipments during the reporting period.

In the current condition, there are no radioactive liquids or liquid systems at the facility, and all solid

material is stored in containers designed for shipping the material. Therefore, there is no projected:;need to process or otherwise handle the material in storage at the Rancho Seco facility and therefore little.

probability that any material would be released from the facility in liquid or gaseous effluents.

Accordingly, there were no radioactive liquid or gaseous effluent releases made from Rancho Seco during the reporting period. In addition, no shipments of solid radioactive Waste were made during the reporting period.

This report has been prepared by SMUD to meet the requirements of Rancho Seco Quality Manual (RSQM), Appendix A, Section 1.5.3 and Offsite Dose Calculation Manual (ODCM) Revision 23, Step 6.12. It is presented in accordance with the format of USNRC Regulatory Guide 1.21. Radiation doses associated with radioactive effluents in liquids and gasses would be calculated for a hypothetical __

individual who receives the maximum possible exposure at or beyond the applicable Site Boundary; had any releases occurred.

Since there were no releases of radioactivity in gaseous and liquid effluents during this report period, the limits of 10 CFR 20 were not exceeded, nor were the numerical guidelines of 10 CFR 50, Appendix I exceeded. A 40 CFR 190 dose evaluation is not required because radioactive effluent releases did not exceed twice the numerical guidelines of 10 CFR 50, Appendix I.

1

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY- DECEMBER 2015 I. SUPPLEMENTAL INFORMATION A. Regulatory Limits & Guidelines for Effluent Releases

1. Gaseous Effluents

a. Dose rate limit at or beyond the Site Boundary for Gaseous Effluents for Tritium and radioactive material in particulate form with half-lives greater than 8 days (ODCM Technical Requirement 6.9.3):

1500 mrem/year to any organ

b. Dose commitment to a member of the public at or beyond the Site Boundary for Gaseous Effluents from Tritium and radioactive material in particulate form with half-lives greater than 8 days (ODCM Technical Requirement 6.9.4, numerical guidelines of 10 CFR 50, Appendix I):

7.5 mrem per calendar quarter to any organ 15 mrem per calendar year to any organ

2. Liquid Effluents

a. The concentration of radioactive material in liquid effluents released beyond the Site Boundary for Liquid Effluents shall not exceed the limits of 10 CFR 20, Appendix B, Table 2, Column 2.

b. Dose commitment to a member of the public at or beyond the Site Boundary for Liquid Effluents from radioactive materials in liquid effluents shall be limited to (numerical guidelines of 10 CFR 50, Appendix I):

1.5 mrem per calendar quarter to the total body 5 mrem per calendar quarter to any organ 3 mrem per calendar year to the total body 10 mrem per calendar year to any organ NOTE: The noble gas source term was removed when spent fuel transfer to the ISFSI was completed in August 2002. Refer~nce to noble gases was completely removed from the ODCM.

2

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY- DECEMBER 2015

8. Maximum Effluent Concentrations

1. Gaseous Effluents The concentrations listed in 10 CFR 20, Appendix B, Table 2, Column 1 (air) are not directly used in calculations for determining permissible gaseous effluent release rates.

The annual dose limits of 10 CFR 20 for unrestricted areas are the doses associated with the concentrations of 10 CFR 20, Appendix B, Table 2, Column 1. ODCM Technical Requirement dose rate limits (mrem/yr) for gaseous effluents are provided to ensure that the dose rate from gaseous effluents at any time at the Site Boundary for Gaseous Effluents will be within the annual dose limits of 10 CFR 20 for unrestricted areas. These dose rate limits (listed above in part A) are used for determining permissible gaseous effluent release rates.

2. Liquid Effluents The concentration values listed in 10 CFR 20, Appendix B, Table 2, Column 2 are used in calculations to determine permissible liquid discharge flow rates. The most conservative Maximum Effluent Concentration (MEG) value for each radionuclide detected in the liquid effluent sample is used in the calculations.

C. Measurement Methods for Total Radioactivity The methods listed below are examples should radioactive effluents be discharged.

1. Gaseous Effluents Liquid Scintillation (H-3)

Gamma Spectroscopy (HPGe)

Beta Proportional (Sr-90, gross beta)

Alpha Proportional (gross alpha)

2. Liquid Effluents Gamma Spectroscopy (HPGe)

Liquid Scintillation (H-3)

Beta Proportional (Sr-90, gross beta)

Alpha Proportional (gross alpha)

NOTE: HPGe refers to Hyper-Pure Germanium 3

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY-DECEMBER 2015 D. Batch Releases (via monitored pathways)

Quarter 1 Quarter 2 Quarter 3 Quarter 4

1. Liquid Discharges

a. Number of batch releases 0 0 0 0

b. Total time period for batch releases (hours) N/A N/A N/A N/A

c. Maximum time period for a batch release (hours) N/A NIA N/A N/A

d. Average time period for a batch release (hours) N/A N/A N/A N/A

e. Minimum time period for a batch release (hours) N/A N/A N/A N/A

f. Average Plant Effluent Flow (cfs) N/A N/A N/A N/A 4

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 E. Unplanned Releases This section describes unplanned releases of radioactivity in liquid and gaseous effluent.

Gaseous None None F. Radioactive Effluent Monitoring Instrumentation Inoperable for Greater Than 30 Days None 5

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY-DECEMBER2015 II. ESTIMATION OF ERROR The methods for establishing error estimates included review of applicable station procedures, inspection of sampling equipment, engineering estimates, statistical applications, review of calibration setpoint data, and communication with plant personnel. The various sources of error (s) in reported values of gaseous effluents, liquid effluents, and solid waste are assumed to be independent, and thus the total error is calculated according to the formula:

Total Error = ~ cr 12 + a} + a/ ... + a/

where: cri = relative error associated with component i Sources of error for gaseous effluents include fan error (flow), grab sampling, collection, filter efficiency, counting, and calibration.

Sources of error for liquid effluents include collection container volume, dilution water flow rate, grab sampling, counting, and calibration.

Sources of error for solid waste include offsite lab smear analysis, dose rate meter calibration, dose rate meter reading, computer program dose-to-curie calculation, sample volume measurement, gamma spec counting, gamma spec calibration, and waste volume determination.

6

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 Ill. GASEOUS EFFLUENTS Table Ill-A, Gaseous Effluents - Summation of All Releases, provides a detailed summary of gaseous effluent releases per quarter. This table summarizes releases of tritium and particulates with half-lives greater than 8 days. The methodology used to calculate the Percent of ODCM Technical Requirement limit is as follows:

L[(Fi){Avg Rel Rate){X I Q){Dose Factor)]

% Tech Req Limit = --=-------------- x 100%

{Dose Rate Limit) where:

Fi = The fraction of the total number of Curies of nuclide i out of the total curies in that category for that quarter (unitless).

NOTE: Fi always equals 1.0 for H-3 because it is the only nuclide in the category.

(Total Cunes. {1E+06µCi) per category per quarter\ Ci Avg Rel Rate=-----..,....----------,.""-----~

(#seconds in the quarter)

X/Q = A default dispersion factor determined to be conservative when compared to the use of actual data (sec/m3). -

Dose Factor = The values derived for each nuclide i from NRC Regulatory Guide 1.109 (Ki, Li+1.1 Mi, or Raij). [Units in (mrem/yr)/(µCi/m3)]

Dose Rate Limit = The Technical Requirement (i.e., Regulatory) limits for dose rate listed in Section I of this report (mrem/yr).

NOTE: Particulates with half-lives less than 8 days are not included in this calculation.

The methodology used to calculate the Estimated Total Error(%) in Table Ill-A is presented in Section II of this report.

Table 111-B, Gaseous Effluents - Ground Level Releases, provides a complete quarterly summary of the amount of radioactivity (Ci) released per radionuclide in each quarter. Data from continuous and batch releases are provided for particulates and tritium. Data reported for batch releases results only from unplanned releases.

Table 111-C, Gaseous Effluents - Typical Lower Limits of Detection, provides a listing of the typical lower limit of detection (LLD) concentrations in µCi/cc for various radionuclides.

Table 111-D, Radiological Impact on Man Due to Gaseous Effluent Releases, provides a summary of calculated radiation doses delivered to a maximum exposed hypothetical individual at the Site Boundary for Gaseous Effluents (actual doses will be assessed in the 2015 Annual REMP Report). The maximum calculated organ dose is listed for each quarter along with an annual total. The direct radiation dose results, based on monitoring badge dosimetry, are also listed. Presented in this table for each category is a comparison versus ODCM Technical Requirement dose limits with the exception of direct radiation measurements.

7

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE 111-A: GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Est. Total Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Error.%

A. Particulates

1. Particulates with half-lives>S days Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO N/A

2. Average Release Rate for period µCi/sec O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO

3. Percent of Tech Req limit % N/A N/A N/A N/A

4. Gross Alpha radioactivity Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO B. Tritium

1. Total Release Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO N/A

2. Average Release Rate for period µCi/sec O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO

3. Percent of Tech Req limit % N/A N/A N/A N/A 8

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE 111-B: GASEOUS EFFLUENTS -GROUND LEVEL RELEASES Nuclides Released

1. Particulates None

2. Tritium None 9

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE 111-C: GASEOUS EFFLUENTS - TYPICAL LOWER LIMITS OF DETECTION RADIONUCLIDES LLD (µCi/cc)

1. Tritium (H-3) 2.27 E-10

2. Particulates:

Manganese-54 2.08 E-12 Cobalt-58 2.29 E-12 lron-59 5.89 E-12 Cobalt-60 3.11E-12 Strontium-89 2.00 E-15 Strontium-90 5.00 E-15 Cesium-134 1.52 E-12 Cesium-137 1.88 E-12 Barium-140 3.06 E-12 Cerium-141 1.15 E-12 Cerium-144 3.69 E-12 10

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE 111-D: RADIOLOGICAL IMPACT ON MAN DUE TO GASEOUS EFFLUENT RELEASES CALCULATED RADIATION DOSES AT THE SITE BOUNDARY FOR GASEOUS EFFLUENTS:

2015 Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Annual A. Tritium, Particulate

1. Maximum Organ Dose mrem 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO

2. Percent Tech Req limit % N/A N/A N/A N/A N/A B. Direct Radiation

1. Dose (Monitoring Badges)1 mrem 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO

2. Percent of Tech Req limit % N/A N/A N/A N/A N/A NOTE: No releases of gaseous radioactive effluent were made from Rancho Seco Nuclear Generating Station in 2015.

1 None of the Indicator stations indicate significant radiation attributable to facility operations.

11

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY- DECEMBER 2015 IV. LIQUID EFFLUENTS Table IV-A, Liquid Effluents - Summation of All Releases, provides a detailed summary of liquid effluent releases per quarter. This table summarizes releases of fission and activation products, tritium, dissolved and entrained gases, and gross alpha radioactivity. Also listed is the volume of waste released prior to dilution and the volume of dilution water used during each quarter.

The following methodology is used to calculate the Average Diluted Concentration and the Percent of ODCM Technical Requirement Limit in Table IV-A:

% Tech Req Limit = +/-[

i Ci ]

MECi where: n =The total number of radionuclides identified Ci = The average diluted concentration of radionuclide i

= (Total Release per Category per Quarter in µCi)

(Total Release Volume(part Fin Table IV -A)in ml)

MECi = 1 The MEC of the i h radionuclide, from 10 CFR 20, Appendix B, Table 2, Column 2 The methodology used to calculate the estimated total error in Table IV-A is presented in Section II of this report.

Table IV-B, Liquid Effluents, provides a complete quarterly summary of the amount of radioactivity (Ci) released per radionuclide in each quarter. Data is provided for fission and activation products, and for dissolved and entrained gases. Tritium and gross alpha are not included in this table (they are listed in Table IV-A). Since no continuous releases of liquid radioactive effluent are made from RSNGS, data is provided only for batch releases.

Table IV-C, Liquid Effluents - Typical Lower Limits of Detection, provides a listing of the typical lower limit of detection (LLD) concentrations in µCi/ml for various radionuclides.

Table IV-D, Radiological Impact on Man Due To Liquid Effluent Releases, provides a summary of calculated radiation doses delivered to a maximum exposed hypothetical individual at the Site Boundary for Liquid Effluents (actual doses will be assessed in the 2015 Annual REMP Report). The maximum calculated total body dose and organ dose are fisted for each quarter along with an annual total. A comparison versus ODCM Technical Requirement dose limits is also presented.

12

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE IV-A: LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Est. Total Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Error.%

A. Fission & Activation Products

1. Total Release (not including tritium, gases, alpha) Ci 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO NIA

2. Average diluted concentration during period µCi/ml 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO

3. Percent of Tech Req limit % NIA N/A N/A N/A B. Tritium

1. Total Release Ci 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO NIA

2. Average diluted concentration during period µCi/ml 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO

3. Percent of Tech Req limit % NIA NIA NIA NIA

c. Dissolved and Entrained Gases

1. Total Release Ci 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO NIA

2. Average diluted concentration during period µCi/ml 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO D. Gross Alpha radioactivity

1. Total Release Ci 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO N/A E. Volume of Waste Released (prior to dilution) Liters 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO NIA F. Volume of dilution water used during period Liters NIA NIA NIA NIA NIA 13

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE IV-8: LIQUID EFFLUENTS Nuclides Released

1. Fission and activation products (excluding tritium. gross alpha)

None

2. Dissolved and entrained gases None NOTE: No releases of liquid radioactive effluent were made from Rancho Seco Nuclear Generating Station in 2015.

14

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE IV-C: LIQUID EFFLUENTS - TYPICAL LOWER LIMITS OF DETECTION RADIONUCLIDES BATCH MODE: LLD (µCi/ml)

1. Tritium (H-3) 2.60 E-06

2. Particulates:

Manganese-54 2.11 E-09 lron-59 3.71 E-09 Cobalt-57 2.12 E-09 Cobalt-58 1.93 E-09 Cobalt-60 1.98 E-09 Zinc-65 4.34 E-09 Strontium-90 5.00 E-10 Ruthenium-106 1.79 E-08 Silver-110m 1.94 E-09 Antimony-125 5.78 E-09 Cesium-134 1.93 E-09 Cesium-136 2.23 E-09 Cesium-137 2.30 E-09 Barium-140 7.75 E-09 Cerium-141 3.60 E-09 Cerium-144 1.59 E-08 15

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE IV-D: RADIOLOGICAL IMPACT ON MAN DUE TO LIQUID EFFLUENT RELEASES CALCULATED RADIATION DOSE COMMITMENTS FOR LIQUID EFFLUENTS:

2015 Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Annual A Maximum Total Body Dose mrem 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO Percent Tech Req limit % N/A N/A N/A N/A N/A B. Maximum Organ Dose mrem 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO 0.00 E+OO Percent Tech Req limit % N/A N/A N/A N/A N/A 16

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 V. SOLID WASTE A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not irradiated fuel)

1. Type of Waste:

Volume Total Est. Total (m3) Activity Error(%)

(Curies)

A. Spent Resins, filter sludges, 0.00 E+OO 0.00 E+OO N/A evaporator bottoms, etc.

B. Dry compressible waste, 0.00 E+OO 0.00 E+OO N/A contaminated equipment, etc C. Irradiated components, 0.00 E+OO 0.00 E+OO N/A control rods, etc.

D. Other (primary metals, 0.00 E+OO 0.00 E+OO N/A valves, piping)

2. Estimate of major nuclide composition Category A and Category B waste Category A Category B Activity Percentage Activity Percentage Radionuclide (Ci) (%) (Ci) (%)

None

3. Estimate of major nuclide composition Category C and Category D waste Category C Category D Activity Percentage Activity Percentage Radionuclide (Ci) (%) (Ci) (%)

None 17

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY- DECEMBER 2015

4. Solid Waste Disposition Mode of Number of Shipments Transportation Destination None N/A N/A

5. Type of Container

a. Not applicable

6. Solidification Agent

a. Not applicable B. IRRADIATED FUEL SHIPMENTS (Disposition)

Number of Shipments None 18

i Powering forward. Together.

March 10, 2016 DPG 16-053 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2015 Attention: Jack Parrott In accordahce with 10 CFR 50.36a(a)(2) and Rancho Seco Quality Manual (RSLBD-010), Appendix A, Section 1.5.3, we are submitting the Rancho Seco 2015 Annual Radioactive Effluent Release .Report for the period of January 1 through-December.31, 2015.

If you or members of your staff have questions requiring additional information or clarification, please.contact me at (916) 732-4893.

Sincerely, Dan A. Tallman Manager, Rancho Seco Assets Enclosures (

Attachment:

Rancho Seco Annual Radioactive Effluent Release Report for 2015)

Cc: NRC, Region IV w/Attachment DPG Chron w/ Attachment RIC 1F.099 & 1L.320 (Report only)

Ranc:ho Sec:o Nuc:lear Generating Station I 14440 Twin Cities Road I Herald, CA 95638-9799 I 1.209.333.2935 I smud.org

RANCHO SECO NUCLEAR GENERATING STATION LICENSE NUMBERS DPR-54 and SNM-2510 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY - DECEMBER 2015 TABLE OF CONTENTS INTRODUCTION ........................................................................................................................................... 1 I. SUPPLEMENTAL INFORMATION .................................................................................................. 2 A. Regulatory Limits & Guidelines for Effluent Releases ......................................................... 2 B. Maximum Effluent Concentrations ...................................................................................... 3 C. Measurement Methods for Total Radioactivity .................................................................... 3 D. Batch Releases (via monitored pathways) ......................................................................... .4 E. Unplanned Releases ........................................................................................................... 5 F. Radioactive Effluent Monitoring Instrumentation Inoperable for Greater Than 30 Days ....................................................................................................................................5 II. ESTIMATION OF ERROR ............................................................................................................... 6 Ill. GASEOUS EFFLUENTS .................................................................................................................. 7 TABLE Ill-A: GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES .................................. 8 TABLE 111-B: GASEOUS EFFLUENTS- GROUND LEVEL RELEASES ......................................... 9 TABLE 111-C: GASEOUS EFFLUENTS -TYPICAL LOWER LIMITS OF DETECTION ................. 10 TABLE 111-D: RADIOLOGICAL IMPACT ON MAN DUE TO GASEOUS EFFLUENT RELEASES ........................................................................................................................ 11 IV. LIQUID EFFLUENTS ...................................................................................................................... 12 TABLE IV-A: LIQUID EFFLUENTS-SUMMATION OF ALL RELEASES ..................................... 13 TABLE IV-B: LIQUID EFFLUENTS ................................................................................................ 14 TABLE IV-C: LIQUID EFFLUENTS-TYPICAL LOWER LIMITS OF DETECTION ....................... 15 TABLE IV-D: RADIOLOGICAL IMPACT ON MAN DUE TO LIQUID EFFLUENT RELEASES ........................................................................................................................ 16 V. SOLID WASTE ............................................................................................................................... 17 ATTACHMENTS None

RSNGS ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT JANUARY- DECEMBER 2015 INTRODUCTION Rancho Seco Nuclear Generating Station (RSNGS) Unit No. 1 is located in Sacramento County, California approximately 25 miles southeast of Sacramento and 26 miles north-northeast of Stockton.

Rancho Seco Unit No. 1 began commercial operation on April 17, 1975. The single unit on the Rancho Seco site was a pressurized water reactor supplied by Babcock and Wilcox. The rated capacity was 913 megawatts electrical. Because of a public vote on June 6, 1989, Sacramento Municipal Utility District (SMUD) shutdown the Rancho Seco Nuclear Generating Station and completed defueling operations on December 8, 1989. Transfer of the spent fuel rod assemblies from the Spent Fuel Pool into dry storage at the Independent Spent Fuel Storage Installation (ISFSI) was completed on August 21, 2002.

Radiological dismantlement of the nuclear facility was completed in December 2008 and the release of the Rancho Seco property, except for the area associated with the Interim Onsite Storage Installation (IOSB), from NRC license DPR-54 was approved on September 25, 2009. With the completion of Phase I of decommissioning, the facility is in a SAFSTOR-type condition awaiting a suitable disposal option for the low-level radioactive waste in storage in the IOSB.

This Annual Radioactive Effluent Release Report (ARERR) provides a summary of gaseous and liquid effluent releases made from Rancho Seco during the period of January 1 through December 31, 2015.

This report also provides a summary of solid radioactive waste shipments during the reporting period.

In the current condition, there are no radioactive liquids or liquid systems at the facility, and all solid

material is stored in containers designed for shipping the material. Therefore, there is no projected:;need to process or otherwise handle the material in storage at the Rancho Seco facility and therefore little.