ML13189A131

Us NRC Fukushima Near-Term Task Force Report, Palo Verde Nuclear Generating Station (Pvngs), Units 1, 2, &3, Implementation of Multi-Unit/Multi-Source Dose Assessment Capability

ML13189A131
Person / Time
Site:	Palo Verde
Issue date:	06/28/2013
From:	Mins D APS
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-06709-DCM/RKR/CJS
Download: ML13189A131 (8)

Text

taps DWIGHT C. MIMS Senior Vice President, Nuclear Regulatory & Oversight Palo Verde Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7605 Tel 623 393 5403 102-06709-DCM/RKR/CJS June 28, 2013 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

References:

1. US NRC Fukushima Near-Term Task Force Report, Recommendations for EnhancingReactor Safety in the 2 1 st Century, dated July 12, 2011 [Agencywide Documents Access and Management System (ADAMS) Accession number ML112510271)

2. Nuclear Energy Institute (NEI) letter to NRC, Industry Implementation of Multi-Unit Dose Assessment Capability,dated January 28, 2013 (ADAMS Accession number ML13028A200)

3. NRC letter to NEI requesting additional details on multi-unit dose assessment capability dated February 27, 2013 (ADAMS Accession number ML13029A632)

4. NEI letter to NRC, Commitment for Implementation of Multi-Unit Dose Assessment Capability,dated March 14, 2013 (ADAMS Accession number ML13073A522)

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528, 50-529, and 50-530 Implementation of Multi-Unit/Multi-Source Dose Assessment Capability Consistent with References 1, 2, 3 and 4, Arizona Public Service Company (APS) is providing a description of the current multi-unit/multi-source dose assessment capability and the plans for enhancing this capability for PVNGS.

Enclosure 1 to this letter contains the dose assessment information for PVNGS.

A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

• Comanche Peak

• Diablo Canyon

• Palo Verde

• San Onofre

• South Texas

• Wolf Creek

AT'TN: Document Control Desk U.S. Nuclear Regulatory Commission Implementation of Multi-Unit/Multi-Source Dose Assessment Capability Page 2 This letter contains one commitment listed in Enclosure 2.

Should you need further information regarding this submittal, please contact Robert K. Roehler, Licensing Section Leader, at (623) 393-5241.

Sincerely, DCM/RKR/CJS - PVNGS Implementation of Multi-Unit/Multi-Source Dose Assessment Capability - APS Commitment cc: A.T. Howell III NRC Region IV Regional Administrator J. K. Rankin NRC NRR Project Manager for PVNGS (electronic)

M. A. Brown NRC Senior Resident Inspector for PVNGS J. A. Kratchman NRC NRR/JLD/PMB D. H. Jaffe NRC NRR/JLD

Enclosure 1 PVNGS Implementation of Multi-Unit/Multi-Source Dose Assessment Capability

PVNGS Implementation of Multi-Unit/Multi-Source Dose Assessment Capability Introduction Consistent with References 1, 2, 3 and 4, Arizona Public Service Company (APS) is providing a description of the current multi-unit/multi-source dose assessment capability and the plans for enhancing this capability for PVNGS. The specific information itemized in Reference 4 is stated, followed by the APS response.

• A summary of the current capability to perform multi-unit/multi-source dose assessment APS ResDonse A. Current Multi-Source Capability APS currently uses Raddose-V Dose Assessment Software developed by AECOM for PVNGS. The software currently has multi-source dose assessment capability. The software can sum up to five different radioactive releases from a single unit and provide an integrated report showing downwind projected doses based on this sum.

The software operating instructions provide direction to the user on how to add additional radioactive releases and produce reports from the software. The training for the Emergency Response Organization (ERO) personnel that perform dose assessment has been reviewed and determined to be adequate for multi-source dose assessment.

B. Current Multi-Unit Capability Raddose-V Dose Assessment Software currently can run concurrently on three PVNGS units from a single computer. The dose assessments from the multiple units can be manually summed to produce a multi-unit dose assessment. APS evaluated the current software operating instructions contained in the Dose Assessment Users Manual and ERO training for producing multi-unit dose assessment capability. It was determined that the current procedural guidance and ERO training for performing dose assessments do not contain sufficient detail to ensure consistent performance during multi-unit events.

For those that do not have this capability, the anticipated schedule to establish it on an interim and/or permanent basis. It is expected that interim measures will be available to perform this function prior to implementation of a permanent solution. Holders of a Combined License (COL) will address the implementation of a multi-unit/multi-source dose assessment capability consistent with their licensing, construction and startup schedules.

APS ResDonse As an operating facility, the elements of the request dealing with COL holders are not applicable to PVNGS.

A. Interim Solution APS will revise the PVNGS Dose Assessment Users Manual and ERO training to provide additional detail on multi-unit/multi-source dose assessment as an interim measure until implementation of a permanent solution. The revision to the Dose I

PVNGS Implementation of Multi-Unit/Multi-Source Dose Assessment Capability Assessment Users Manual and ERO training for the interim measures are under development and are scheduled to be implemented by November 30, 2013.

B. Permanent Solution In order to reduce the potential for manual summation errors and to increase overall dose assessment efficiency, APS intends to implement updated software. This software revision will have the capability to automatically sum selected assessment results using a revised computer methodology.

APS commits to having multi-unit/multi-source dose assessment capability no later than December 31, 2014, as described in Reference 4 and in Enclosure 2 of this submittal.

• Due dates associated with each key schedule action or milestone APS Response Milestone Schedule Milestone Due Date Revise the Dose Assessment Users Manual to November 30, 2013 add detailed instructions on how to perform a multi-unit/multi-source dose assessment.

[Action Tracking number (ACT) 4420205]

Train the appropriate Emergency Response November 30, 2013 Organization personnel on the revision to the Dose Assessment Users Manual for multi-unit/multi-source dose assessment.

(ACT 4420207)

Implement the revised dose assessment December 31, 2014 software with multi-unit/multi-source dose assessment capability. [Regulatory Commitment Tracking System Action Item number (RCTSAI) 4420179]

2

PVNGS Implementation of Multi-Unit/Multi-Source Dose Assessment Capability A description of how the implementation schedule will be tracked and the associated tracking identifiers (e.g., a commitment tracking or corrective action system number).

APS Response PVNGS is tracking completion of the above implementation actions in the PVNGS work management and regulatory commitment tracking system as ACT 4420205, ACT 4420207 and RCTSAI 4420179 as indicated in the aforementioned table.

References

1. US NRC Fukushima Near-Term Task Force Report, Recommendations for Enhancing Reactor Safety in the 2 1 st Century, dated July 12, 2011 [Agencywide Documents Access and Management System (ADAMS) Accession number ML112510271)

2. Nuclear Energy Institute (NEI) letter to NRC, Industry Implementation of Multi-Unit Dose Assessment Capability, dated January 28, 2013 (ADAMS Accession number ML13028A200)

3. NRC letter to NEI requesting additional details on multi-unit dose assessment capability dated February 27, 2013 (ADAMS Accession number ML13029A632)

4. NEI letter to NRC, Commitment for Implementation of Multi-Unit Dose Assessment Capability,dated March 14, 2013 (ADAMS Accession number ML13073A522) 3

Enclosure 2 APS Commitment

APS Commitment APS makes the following commitment with regard to plans for enhancing the multi-unit/multi-source dose assessment capability for PVNGS:

APS Commitment Completion Date 1 Implement the revised dose assessment software December 31, 2014 with multi-unit/multi-source dose assessment capability. (RCTSAI 4420179)

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