ML15260B188

Request for Exemption from 10 CFR 140.11 (a)(11)

ML15260B188
Person / Time
Site:	San Onofre
Issue date:	09/16/2015
From:	Thomas J. Palmisano Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
TAC M87052
Download: ML15260B188 (15)

Text

IEDISON

• !SOUTHERN CALIFORNIA iePeietDeomsinn Thomas I.Palmisano CiefNclea V OffsiertDcmisinn An EDISON INTERNATIONAL company September 16, 2015 10 CFR 140.8 10 CFR 140.11I U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555

Subject:

Docket NO. 50-206, 50-361, and 50-362 Request for Exemption from 10 CFR 140.11 (a)(11)

San Onofre Nuclear Generating Station Units 1, 2, and 3

References:

1. Letter from U.S. Nuclear Regulatory Commission to Southern California Edison, "Exemption from the Requirements of 10 CFR 140.11 (a)(4) for the San Onofre Nuclear Generating Station, Unit 1 (TAC NO. M87052)," dated May 4, 1994.

2. Letter from W. C. Marsh, SCE, to U. S. Nuclear Regulatory Commission, dated March 8, 1993,

Subject:

Certification of Permanently Defueled Status, SONGS Unit 1

3. Letter from W. C. Marsh, SCE, to U. S. Nuclear Regulatory Commission, dated March 10, 1993,

Subject:

Corrected Copy of Letter Certifying Permanently Defueled Status, SONGS Unit 1

4. Letter from P. T. Dietrich (SCE) to the U. S. Nuclear Regulatory Commission (NRC,) dated June 12, 2013;

Subject:

Certification of Permanent Cessation of Power Operations, San Onofre Nuclear Generating Station, Units 2 and 3

5. Letter from P. T. Dietrich (SCE) to the U. S. Nuclear Regulatory Commission (NRC,) dated June 28, 2013;

Subject:

Permanent Removal of Fuel from the Reactor Vessel, San Onofre Nuclear Generating Station Unit 3

6. Letter from P. T. Dietrich (SCE) to the U. S. Nuclear Regulatory Commission (NRC), dated July 22, 2013;

Subject:

Permanent Removal of Fuel from the Reactor Vessel, San Onofre Nuclear Generating Station Unit 2 P.O. Box 128Ceet,1, .,* l San CeeeCA 92674 x_

Fax: (949) 368-6183 *I tom.palmisano@sce.com

Document Control Desk --

Spebr1,21 September 16, 2015

Dear Sir or Madam:

Pursuant to 10 CFR 140.8, Southern California Edison (SCE) requests a permanent exemption from 10 CFR 140.11l(a) (4) for San Onofre Nuclear Generating Station (SONGS) Units 1, 2 and

3. 10 CFR 140.11 requires licensees to have and maintain two levels of financial protection against off-site liability for each nuclear reactor which is licensed to operate, designed for the production of electrical energy, and has a rated capacity of 100,000 kilowatts electric (kWe) or more. The two levels of financial protection are as follows:

• Primary insurance coverage of $375,000,000 from private sources; and

• Secondary financial protection in the form of private liability insurance available under an industry retrospective rating plan.

SCE is requesting an exemption to 10 CFR 140.1 1(a)(4) for SONGS that would reduce the required level of offsite primary insurance coverage to $100,000,000 and eliminate the requirement for SONGS to carry secondary financial protection. The request to eliminate the requirement to carry secondary financial protection is for SONGS Units 2 and 3 only. The NRC has previously granted an exemption for SONGS Unit 1 from the requirements of 10 CFR 140.1 1(a)(4) which permitted SCE's withdrawal from participation in the industry retrospective rating plan (secondary financial protection) (Reference 1).

The underlying purpose of 10 CFR 140.1 1(a)(4) is to require sufficient liability insurance to ensure adequate funding of any claims resulting from a potential nuclear incident or precautionary evacuation associated with an individual power reactor. However, the regulation does not take into consideration the reduced potential for, and consequences of, such nuclear incidents at permanently shutdown facilities. The SONGS facility is permanently shut down and defueled (References 2, 3, 4, 5 and 6). The proposed exemption would allow a reduction in the level of financial protection against off-site liability at SONGS to a level that is commensurate with the permanently defueled status of the facility and the underlying purpose of the rule.

The proposed exemption request reflects the reduced risk associated with SONGS in the permanently defueled condition. It would allow a commensurate reduction in financial protection.

Operations of SONGS in accordance with this exemption request will continue to provide adequate financial protection for the appropriate stakeholders. contains our evaluation of the proposed exemption request.

SCE respectfully requests that this exemption be granted as soon as reasonably possible to relieve this potential financial obligation.

There are no new regulatory commitments made within this submittal.

If there are any questions, please call Mr. Jim Kay, Manager, Nuclear Regulatory Affairs, at (949) 368-7418.

Document Control Desk -- September Spebr1,21 16, 2015 I declare under penalty of perjury that the foregoing is true and correct.

Executed on ,.Ž ,z ,/*2015.

Sincerely, Request for Exemption from 10 CFR 140.1 1(a)(4)

CC: M. Dapas, Regional Administrator, NRC Region IV M. Vaaler, NRC Project Manager, SONGS Unit 1 Thomas J. Wengert, NRC Project Manager, SONGS Units 2 and 3 R. L. Kellar, Region IV, Branch Chief, Repository and Spent Fuel Safety

Attachment 1 Request for Exemption from 10 CFR 140.1 1(a)(4)

San Onofre Nuclear Generating Station Units 1, 2 and 3

1 San Onofre Nuclear Generating Station Units 1, 2, and 3 Request for Exemption from 10 CFR 140.11 I. DESCRIPTION OF REQUESTED EXEMPTION Pursuant to 10 CER 140.8, "Specific exemptions," Southern California Edison (SCE) requests a permanent exemption from 10 CFR 140.11 (a)(4) for San Onofre Nuclear Generating Station (SONGS). 10 CFR 140.11(a)(4) requires licensees to have and maintain two levels of financial protection against off-site liability for each nuclear reactor which is licensed to operate, designed for the production of electrical energy, and has a rated capacity of 100,000 kilowatts electric (kWe) or more. The two levels of financial protection are as follows:

• Primary insurance coverage of $375,000,000 from private sources; and,

• Secondary financial protection in the form of private liability insurance available under an industry retrospective rating plan.

The proposed exemption would reduce the required level of offsite primary insurance coverage to $100,000,000 and eliminate the requirement for SCE to carry secondary financial protection.

The request to eliminate the requirement to carry secondary financial protection is for SONGS Units 2 and 3 only. The NRC has previously granted an exemption for SONGS Unit 1 from the requirements of 10 CFR 140.1 1(a)(4) which permitted SCE's withdrawal from participation in the industry retrospective rating plan (secondary financial protection) (Reference 1).

10 CFR 140.11 (a)(4) reads as follows:

10 CFR 140.11, "Amounts of financial protection for certain reactors" (a) Each licensee is required to have and maintain financialprotection:

(4) In an amount equal to the sum of $375,000,000 and the amount available as secondary financialprotection (in the form of private liability insurance available under an industry retrospective rating plan providing for deferredpremium charges equal to the pro rata share of the aggregate public liability claims and costs, excluding costs payment of which is not authorized by section 170o.(1) (D) of the Act, in excess of that covered by primary financial protection) for each nuclearreactor which is licensed to operate and which is designed for the production of electrical energy and has a rated capacity of 100,000 electrical kilowatts or more: Provided, however, that under such a plan for deferred premium charges for each nuclear reactor which is licensed to operate, no more than $121,255,000 with respect to any nuclear incident (plus any surchargeassessed under subsection 1700. (1)(E) of the Act) and no more than $18,963,000 per incident within one calendaryear shall be charged. Except that, where a person is authorized to operate a combination of 2 or more nuclear reactors located at a single site, each of which has a rated capacity of 100,000 or more electrical kilowatts but not more than 300,000 electrical kilowatts with a combined rated capacity of not more than 1,300,000 electricalkilowatts, each such combination of reactors shall be

2 considered to be a single nuclear reactorfor the sole purpose of assessing the applicable financial protection required under this section.

II. BACKGROUND SONGS Unit 1 commercially generated power from January 1, 1968 until November 30, 1992.

SONGS Unit 1 was permanently defueled on March 6, 1993 (References 2 and 3) and was maintained in SAFSTOR until June 1999, when decommissioning was initiated. Spent fuel has been removed from SONGS Unit 1 and is stored in the SONGS Independent Spent Fuel Storage Installation at SONGS and in the GE-Hitachi Morris facility in Illinois. All SONGS Unit 1 above ground structures have been removed. On May 4, 1994, the NRC granted an exemption for Unit 1 from the requirements of 10 CFR 140.11 (a)(4) (Reference 1) which permitted SCE's withdrawal from participation in the industry retrospective rating plan (secondary level financial protection).

SONGS Units 2 and 3 commercially generated power until they permanently ceased operation and were defueled. By letter dated June 12, 2013 (Reference 4), Southern California Edison (SCE) submitted a certification to the NRC indicating its intention to permanently cease power operations at SONGS Units 2 and 3, pursuant to 10 CFR 50.82(a)(1 )(i). On June 28, 2013, SCE submitted a certification of permanent removal of fuel from the reactor vessel for SONGS Unit 3 (Reference 5) pursuant to 10 CER 50.82(a)(1)(ii). On July 22, 2013, SCE submitted a certification of permanent removal of fuel from the reactor vessel for SONGS Unit 2 (Reference 6) pursuant to 10 CFR 50.82(a)(1 )(ii). Upon docketing of these certifications, the 10 CFR Part 50 licenses for SONGS Units 2 and 3 no longer authorize operation of the reactor or emplacement or retention of fuel into the reactor vessel, as specified in 10 CFR 50.82(a)(2).

SONGS Units 2 and 3 have been shut down since January 2012. At the time of this submittal, it will have been over three years since the most recent irradiation of spent fuel currently stored in the Units 2 and 3 spent fuel pools. It is expected that SONGS Units 2 and 3 will remain in a wet fuel storage configuration for approximately three to five years. SONGS poses significantly lower risk to the public health and safety in this defueled condition.

Ill. DISCUSSION The underlying purpose of 10 CFR 140.11 is to require sufficient liability insurance to ensure adequate funding of any claims resulting from a potential nuclear incident or precautionary evacuation associated with an individual power reactor. The financial protection limits of 10 CFR 140.11 were established to require that licensees maintain sufficient insurance to cover the costs of a nuclear incident at an operating reactor. However, the regulation does not take into consideration the reduced potential for and consequences of nuclear incidents at permanently shutdown and defueled facilities like SONGS.

Although the likelihood of an accident at an operating reactor is small, the consequences can be large, in part due to the high temperatures and pressures of the reactor coolant system as well as the inventory of radionuclides. For a permanently shutdown and defueled reactor, nuclear accidents involving the reactor and its associated systems, structures and components are no longer possible. Furthermore, the probability and consequences of non-operating reactor nuclear incidents are substantially reduced because; 1) the decay heat from the spent fuel

3 decreases over time, which reduces the amount of cooling required to prevent the spent fuel from heating up to a temperature that could compromise the ability of the fuel cladding to retain fission products; and 2) the decay of the relatively short-lived radionuclides contained in the spent fuel reduces the inventory of radioactive materials available for release, particularly volatile components like iodine and noble gasses.

Although the potential for, and consequences of, nuclear accidents decline substantially after a plant permanently defuels its reactor, they are not completely eliminated. There are potential onsite and offsite radiological consequences that could be associated with the onsite storage of the spent fuel in the spent fuel pool (SFP). In addition, a site with a permanently shutdown and defueled reactor may contain an inventory of radioactive liquids, activated reactor components, and contaminated materials. For purposes of modifying the amount of offsite liability insurance coverage maintained by a permanently shutdown and defueled reactor licensee, the potential radiological consequences of these non-operating reactor nuclear incidents are appropriate to consider, despite their very low probability of occurrence.

This request is consistent with Staff rulemaking and policy proposals contained in Staff letters SECY-00-0145, "Integrated Rulemaking Plan for Nuclear Power Plant Decommissioning" (Reference 7) and SECY-01-0100, "Policy Issues Related to Safeguards, Insurance, and Emergency Preparedness Regulations at Decommissioning Nuclear Power Plants Storing Fuel in Spent Fuel Pools." (Reference 8). Both Staff letters recommended reductions in offsite primary insurance coverage and withdrawal from participation in the industry retrospective rating plan for decommissioning plants.

The proposed reduction in the level of offsite primary insurance coverage from $375 million to

$100 million and elimination of the requirement to continue participation in the industry retrospective rating plan would continue to serve the underlying purpose of the rule. These requested changes would maintain a conservative level of financial protection considered commensurate with the significant reduction in the probability and consequences of potential nuclear incidents at SONGS Units 1, 2 and 3. Consistent with the NRC's conclusions documented in SECY-00-0145, this reduced financial protection insurance coverage would continue to conservatively ensure adequate funding to address potential claims resulting from the reduced offsite consequences of a permanently defueled facility by members of the public.

A. Reduced Scope and Severity of Radiological Accidents at SONGS SONGS Unit I ceased operations on November 30, 1992. SONGS Unit 1 was permanently defueled and was maintained in SAFSTOR until June 1999, when decommissioning was initiated. All spent fuel has been removed from SONGS Unit 1 and is stored in the Independent Spent Fuel Storage Installation (ISFSI) at SONGS and in the GE-Hitachi Morris facility in Illinois.

All SONGS Unit 1 above ground structures have been removed.

SONGS Units 2 and 3 permanently ceased operation in June, 2013. All nuclear fuel has been removed from their reactor vessels. The irradiated fuel will be stored in the spent fuel pool (SEP) and in the ISFSI until it is shipped offsite. In this condition, the number of credible accidents/transients is significantly smaller than for a plant authorized to operate the reactor or emplace or retain fuel in the reactor vessel.

As indicated in SCE's request for Exemption from Emergency Planning requirements (Reference 9), the SONGS Units 2 and 3 Updated Safety Analysis Report has been updated to revise the Chapter 15 Safety Analysis section for conformance with the defueled status of the

4 reactors. Reference 10 submitted a revision of Chapter 15 to the NRC to aid in the various ongoing reviews. These updates demonstrate that the offsite consequences of the remaining design basis accidents would be considerably less than during reactor operations. The NRC has reviewed these results as part of the approval of the Exemption from Emergency Planning requirements (Reference 11 ).

B. Plant-Specific Analyses of Beyond Design Basis Events SONGS Units 2 and 3 Loss of Cooling Water Inventory with No Air Cooling SCE's request for Exemption from Emergency Planning requirements (Reference 9) as supplemented by Response to Requests for Additional Information Regarding Emergency Planning Exemption Request (Reference 12, 13, and 14) also summarize the results of evaluations of a beyond design basis scenario involving a completely drained spent fuel pool and blocked air flow passages. With no water cooling or convective air cooling (adiabatic analysis case), the maximum zirconium temperature is expected to remain below 900°C, the temperature at which uncontrolled oxidation could occur, for sufficient time for SCE to take mitigative actions. Based on the summarized analysis the time for the cladding on the hottest fuel assembly to heat up to 900°C would be over 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br />. The time to heat up to the lowest temperature where clad swelling and incipient cladding failure might occur (565°C) would be over 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

The evaluated and demonstrated time to deploy mitigation strategy equipment using minimum Post Defueled Emergency Planning staffing levels is under 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Direct and scattered radiological dose rates were calculated for this fully drained configuration of the spent fuel pool. At the site Exclusion Area Boundary the dose rates were shown to be a small fraction of the established threshold for emergency protective actions for the public (EPA Protective Action Guidelines).

SONGS Units 2 and 3 Loss of Cooling Water Inventory with Air Cooling An evaluation has also been done for a beyond design basis scenario involving a completely drained spent fuel pool without blocked air passages. The calculations determined that under the bounding conservative modeling scenario August 31, 2014 is the date by which spent fuel has decayed such that its internal heat generation rate is low enough to preclude the zirconium cladding from reaching 565°C, well below the 900°C threshold for uncontrolled zirconium oxidation.

Fuel Handling Building temperatures were modeled based on normal ventilation supply and exhaust system subsystem operation as described in UFSAR Section 9.4.3.1 using the GOTHIC computer program. Local variations in solar heat loads were calculated using the UHSSIM computer program. The maximum steady-state temperature of the zirconium cladding was calculated using the COBRA program with a conservative set of heat transfer assumptions for natural air circulation in the spent fuel racks.

The analysis used a realistic estimate for the total spent fuel heat generation rate calculated using the methodology described in NUREG-0800, Rev.2, Branch Technical Position (BTP)

ASB 9-2, "Residual Decay Energy for Light-Water Reactors for Long-Term Cooling" and benchmarked against measurements performed in 2011. All other inputs are based on the

5 current plant configuration; no planned design changes were considered. The bounding assembly heat generation rate is taken from the ORIGEN model.

The analysis shows that the surface temperature of the cladding in the spent fuel pools will not exceed 56500 following a hypothetical total loss of water from the spent fuel pool on or after August 31, 2014. Adequate cooling is maintained due to heat rejection to the surrounding fuel assemblies and from the spent fuel pool to the outside, primarily via the fuel handling building ventilation system.

C. NRC Proposed Rulemaking The NRC staff has generically evaluated the legal, technical, and policy issues regarding the financial protection requirements for large nuclear power plants that have been permanently shut down. The results of these evaluations were summarized in SECY-96-256 (Reference 15) and the NRC staff recommended course of action was approved by the Commission in a Staff Requirements Memo (SRM) (Reference 16). These documents established the basis for the NRC exercising its discretionary authority to specify an appropriate level of financial protection from offsite liability for permanently shutdown nuclear power reactors.

In SECY-97-186 (Reference 17), the NRC staff proposed rulemaking for Commission approval that was consistent with SECY-96-256, Option 2. In SECY-97-1 86, the NRC staff proposed changes to 10 CER 140.11 that would establish appropriate levels of offsite liability coverage for plants that are permanently shutdown and defueled and that meet specified facility configurations during permanent shutdown.

On October 30, 1997, the NRC published a proposed rulemaking to amend regulations governing liability coverage for permanently shutdown nuclear plants. The proposed rulemaking established four different configurations for permanently shutdown plants that encompassed anticipated spent fuel characteristics and storage modes during the period between permanent shutdown and termination of the license. The rulemaking proposed financial protection requirements for each of the four specified plant configurations, including a configuration where the plant is permanently shutdown, the reactor defueled, and the spent fuel stored in the spent fuel pool is not susceptible to a zircaloy cladding failure or gap release caused by an incipient fuel cladding failure if the pool is accidentally drained.

However, the NRC staff rulemaking efforts were suspended prior to issuing the final rule when it was realized that an NRC staff-approved technical basis did not exist for generic decay times after which the zirconium cladding failure concern could be eliminated. The proposed changes to regulations governing offsite liability coverage were subsequently included in a risk-informed, integrated rulemaking initiative for decommissioning nuclear power plants, which has yet to be acted on. This rulemaking initiative, documented in SECY-00-145 (Reference 7), included offsite financial protection requirements based on the proposed decommissioning insurance rulemaking issued on October 30, 1997, as modified to address the public comments received in response to that proposed rulemaking. The modified rulemaking, as incorporated into SECY-00-145, would have allowed the minimum offsite primary insurance coverage requirement to be reduced to $100 million and not require secondary financial protection once the spent fuel in the spent fuel pool is no longer thermal-hydraulically capable of sustaining a zirconium fire, based on a plant specific analysis.

6 As discussed in the staff response to a question in SECY-00-145 (see Attachment 2, page 6, response to Question 3)

".....the staff believes that full insurance coverage must be maintainedfor 5 years or until a licensee can show by analysis that its spent fuel pool is no longer vulnerable to such [a zirconium] fire."

In addition, as discussed in the staff response to a question in SECY-00-145 (see Attachment 2, page 6, response to Question 4):

"Since the zirconium fire scenario would be possible for up to several years following shutdown, and since the consequences of such a fire could be severe in terms of offsite health consequences, property damage, and land contamination, the staff position is that full offsite liability coverage (both primary and secondary levels) must be retainedfor five years or until analysis has indicated that a zirconium fire is no longer possible. At that point, primary coverage would be reduced from $200 million to $100 million and participationin the secondary retrospective rating pool would no longer be required."

In a memorandum dated August 16, 2002 (Reference 8), the NRC Executive Director for Operations provided the NRC Commissioners a status of the regulatory exemptions for plants in decommissioning. This memorandum stated that, "In the absence of any anticipatednuclearpower plant decommissionings in the near term, the staff believes that there is no immediate need for moving forward with a majority of the decommissioning regulatory improvement work that is currently planned. Specifically, broad scope regulatoryimprovements for decommissioning nuclear power plants do not appear to be of sufficient priority given a lack of future licensees that would benefit at this time. Due to higher priorities, resourcesare being deferred for decommissioning rulemakings that are not currently in progress or not related to security.... If any plants do unexpectedly shutdown permanently, decommissioning regulatoryissues would continue to be addressed through the exemption process in a manner similarto current practice."

Thus, the proposed rulemaking process changes for decommissioning plants discussed above were stopped in deference to the exemption process that had been used for previous licensees.

D. Precedents The SONGS exemption request from 10 CFR 104.11 is consistent with changes to financial protection approved by the NRC for several other decommissioning plants including Zion Units 1 and 2 (Reference 18), Millstone 1 (Reference 19) and more recently Kewaunee Power Station (Reference 20) and Crystal River Unit 3 (Reference 21). In all cases the NRC approved a reduction in offsite primary insurance coverage and withdrawal from participation in the industry retrospective rating plan based upon similar evaluations of reduced offsite hazards at permanently defueled facilities.

IV. JUSTIFICATION FOR EXEMPTION AND SPECIAL CIRCUMSTANCES The specific requirements for granting exemptions from Part 140 regulations are set forth in 10 CFR 140.8. The Commission is authorized to grant an exemption upon a determination that

7 the exemption (a) is authorized by law, and (b) is otherwise in the public interest. The following supports a finding by the NRC staff that an exemption should be authorized:

A. The Exemption is Authorized by Law The requested exemption is authorized by law and similar exemptions have been granted by the Commission. Other permanently shutdown plants that have been granted similar exemptions are discussed above. In addition, the requested exemption is consistent with the guidelines presented by the NRC staff in SECY-96-256 and the NRC proposed rulemaking for 10 CFR Part 140.11 noticed in the Federal Register on October 30, 1997. The proposed exemption is consistent with the requirements of the Atomic Energy Act of 1954 as amended (Price-Anderson Act), which requires that power reactor licensees maintain some level of public liability financial protection.

B. The Exemption is Otherwise in the Public Interest Approval of the exemption request would result in more efficient use of funds in the SONGS decommissioning trust fund. The reduction in offsite primary insurance coverage from $375 million to $100 million and elimination of the requirement to participate in the industry retrospective rating plan for SONGS Units 2 and 3 would continue to require a level of financial protection commensurate with the underlying purpose of the rule while eliminating an unnecessary financial burden. Therefore, the proposed exemption is otherwise in the public interest.

V. ENVIRONMENTAL CONSIDERATION The proposed exemption meets the eligibility criterion for categorical exclusion set forth in 10 CFR 51 .22(c)(25), because the proposed exemption involves: (i) no significant hazards consideration; (ii) no significant change in the types or significant increase in the amounts of any effluent that may be released offsite; (iii) no significant increase in individual or cumulative occupational radiation exposure; (iv) no significant construction impact; (v) no significant increase in the potential for consequences from radiological accidents; and (vi) the requirements from which the exemption is sought involve: (H) Surety, insurance or indemnity requirements.

Therefore, pursuant to 10 CER 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed exemption.

(i) No significant hazards consideration Pursuant to 10 CFR 140.8, "Specific Exemptions," Southern California Edison (SCE) requests a permanent exemption from 10 CFR 140.1 1(a)(4) for San Onofre Nuclear Generating Station (SONGS). The proposed exemption would reduce offsite primary insurance coverage to $100 million and eliminate the requirement for SONGS Units 2 and 3 to participate in the industry retrospective rating plan. In addition to evaluating the criteria of 10 CER 140.8, SCE has evaluated the proposed exemption to determine whether or not a significant hazards consideration is involved by focusing on the three standards set forth in 10 CFR 50.92 as discussed below:

8

1. Does the proposed exemption involve a significant increase in the probability or consequences of an accident previously evaluated?

The proposed exemption has no effect on plant systems, structures and components (SS0s) and no effect on the capability of any plant SSC to perform its design function. The proposed exemption would not increase the likelihood of the malfunction of any plant SSC.

The proposed exemption would have no effect on the probability or consequences of any of the previously evaluated accidents in the Defueled Safety Analysis Report (SONGS Unit 1),

or the Updated Final Safety Analysis Report (SONGS Units 2 and 3).

Therefore, the proposed exemption does not involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does the proposed exemption create the possibility of a new or different kind of accident from any accident previously evaluated?

The proposed exemption does not involve a physical alteration of the plant. No new or different type of equipment will be installed and there are no physical modifications to existing equipment associated with the proposed exemption. Similarly, the proposed exemption would not physically change any structures, systems, or components involved in the mitigation of any accidents. Thus, no new initiators or precursors of a new or different kind of accident are created. Furthermore, the proposed exemption does not create the possibility of a new accident as a result of new failure modes associated with any equipment or personnel failures. No changes are being made to parameters within which the plant is normally operated, or in the setpoints which initiate protective or mitigative actions, and no new failure modes are being introduced.

Therefore, the proposed exemption does not create the possibility of a new or different kind of accident from any previously evaluated.

3. Does the proposed exemption involve a significant reduction in a margin of safety?

The proposed exemption does not alter the design basis or any safety limits for the plant.

The proposed exemption does not impact station operation or any plant SSC that is relied upon for accident mitigation.

Therefore, the proposed exemption does not involve a significant reduction in a margin of safety.

Based on the above, SCE concludes that the proposed exemption presents no significant hazards consideration, and, accordingly, a finding of "no significant hazards consideration" is justified.

(ii) There is no significant change in the types or significant increase in the amounts of any effluent that may be released offsite.

There are no expected changes in the types, characteristics, or quantities of effluents discharged to the environment associated with the proposed exemption. There are no materials or chemicals introduced into the plant that could affect the characteristics or types

9 of effluents released offsite. In addition, the method of operation of waste processing systems will not be affected by the exemption. The proposed exemption will not result in changes to the design basis requirements of SSCs that function to limit or monitor the release of effluents. All the SSCs associated with limiting the release of effluents will continue to be able to perform their functions. Therefore, the proposed exemption will result in no significant change to the types or significant increase in the amounts of any effluents that may be released offsite.

(iii) There is no significant increase in individual or cumulative occupational radiation exposure.

The exemption would result in no expected increases in individual or cumulative occupational radiation exposure on either the workforce or the public. There are no expected increases in normal occupational doses.

(iv) There is no significant construction impact.

There are no construction activities associated with the proposed exemption.

(v) There is no significant increase in the potential for consequences from radiological accidents.

See the no significant hazards considerations discussion in item 1 above.

(vi) The requirements from which exemption is sought involve surety, insurance or indemnity requirements.

The requirements from which the exemption is sought involve financial protection and for the indemnification and limitation of liability of licensees pursuant to Section 170 of the Atomic Energy Act of 1954, as amended.

VI. CONCLUSION In conclusion, based on the considerations discussed above, (1) the health and safety of the public will not be endangered by the proposed exemption, (2) operation of SONGS will continue to be conducted in compliance with the Commission's regulations (as exempted), and (3) the approval of the exemptions will not be inimical to the common defense and security or to the health and safety of the public.

Pursuant to the provisions of 10 CFR 140.8, "Specific exemptions," SCE is requesting an exemption from 10 CFR 140.11 (a)(4) for SONGS Units 1, 2, and 3 . The requested exemption is authorized by law and otherwise in the public interest.

10 REFERENCES

1. Letter from U.S. Nuclear Regulatory Commission to Southern California Edison, "Exemption from the Requirements of 10 CFR 140.1 1(a)(4) for the San Onofre Nuclear Generating Station, Unit 1 (TAC NO. M87052)," dated May 4, 1994.

2. Letter from W. C. Marsh, SCE, to U. S. Nuclear Regulatory Commission, dated March 8, 1993,

Subject:

Certification of Permanently Defueled Status, SONGS Unit 1

3. Letter from W. C. Marsh, SCE, to U. S. Nuclear Regulatory Commission, dated March 10, 1993,

Subject:

Corrected Copy of Letter Certifying Permanently Defueled Status, SONGS Unit 1

4. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Certification of Permanent Cessation of Power Operations, San Onofre Nuclear Generating Station, Units 2 and 3," dated June 12, 2013.

5. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Permanent Removal of Fuel from the Reactor Vessel, San Onofre Nuclear Generating Station Unit 3,"

dated June 28, 2013.

6. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Permanent Removal of Fuel from the Reactor Vessel, San Onofre Nuclear Generating Station Unit 2,"

dated July 22, 2013.

7. SECY-00-145, "Integrated Rulemaking Plan for Nuclear Power Plant Decommissioning,"

dated June 28, 2000

8. SECY-01-0100, "Policy Issues Related to Safeguards, Insurance, and Emergency Preparedness Regulations at Decommissioning Nuclear Power Plants Storing Fuel in Spend Fuel Pools (WITS 200000126)," dated June 4, 2001.

9. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Emergency Planning Exemption Request, San Onofre Nuclear Generating Station, Units 1, 2, and 3 and Independent Spent Fuel Storage Installation," dated March 31, 2014.

10. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Updated Final Safety Analysis Report chapter 15, San Onofre Nuclear Generating Station, Units 2 and 3," dated September 17, 2014.

11. Letter from U.S. Nuclear Regulatory Commission to Southern California Edison, San Onofre Nuclear generating Station, Units 1, 2 and 3 and Independent Spent Fuel Storage Installation - exemptions from Certain Emergency Planning requirements and Related Safety Evaluation (TAC NOS. MF3835, MF3836, and MF3837), dated June 4, 2015

12. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Response to Request for Additional Information Regarding Emergency Planning Exemption Request San Onofre Nuclear Generating Station, Units 1, 2, 3 and ISFSI," dated September 9, 2014.

13. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Response to Request for Additional Information Proposed Exemptions from Certain Portions of 10 CFR 50.47 and Appendix E," October 6, 2014. Redacted Version dated December 15, 2014. 78)

14. Letter from Southern California Edison to U.S. Nuclear Regulatory Commission, "Response to Requests for Clarification of October 6, 2014 RAI Responses Concerning Emergency

1l Planning Exemption Request San Onofre Nuclear Generating Station, Units 1, 2, 3 and ISFSI," dated October 27, 2014.

15. SECY-96-256, "Changes to the Financial Protection Requirements for Permanently Shutdown Nuclear Power Reactors, 10 CFR 50.54(w) and 10 CFR 140.11," dated December 17, 1996.

16. Staff Requirements Memo, "Re: SECY-96-256, Changes to Financial Protection Requirements for Permanently Shutdown Nuclear Power Reactors," dated January 28, 1997.

17. SECY-97-1 86, "Changes to the Financial Protection Requirements for Permanently Shutdown Nuclear Power Reactors, 10 CER 50.54(w) and 10 CFR 140.11 ," dated August 13, 1997.

18. Letter from U.S. Nuclear Regulatory Commission to Commonwealth Edison Company, "Zion Nuclear Power Station, Units 1 and 2 - Exemption from Requirements of 10 CFR 50.54(w) and 10 CFR 140.11 (TAC NOS. MA6936 and MA6937)," dated December 21, 1999

19. Letter from U.S. Nuclear Regulatory Commission to Dominion Nuclear Connecticut, Inc.,

"Millstone Power Station, Unit I - Exemption from Certain Requirements of 10 CFR Part 140 (TAC NO. MA6658)," date March 30, 2004

20. Letter from U.S. Nuclear Regulatory Commission to Dominion Energy Kewaunee, Inc.,

"Kewaunee Power Station - Exemption from the Requirements of Title 10 of the Code of Federal Regulations, Part 140, Section 140.1 1(a)(4) Concerning Primary and Secondary Liability Insurance (TAC NO. MF3916)," date March 16, 2015

21. Letter from U.S. Nuclear Regulatory Commission to Crystal River Nuclear Plant "Crystal River Unit 3 Nuclear Generating Plant - Exemption from the Requirements of Title 10 of the Code of Federal Regulations, Part 140, Section 140.11 (a)(4) Concerning Primary and Secondary Liability Insurance (TAC NO. MF3588)," date April 27, 2015