ML13129A132
| ML13129A132 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 05/28/2013 |
| From: | Wang A Plant Licensing Branch IV |
| To: | Entergy Operations |
| Wang A | |
| References | |
| TAC MF0012 | |
| Download: ML13129A132 (10) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May 28,2013 Vice President, Operations Entergy Operations, Inc.
Grand Gulf Nuclear Station P.O. Box 756 Port Gibson, MS 39150
SUBJECT:
GRAND GULF NUCLEAR STATION, UNIT 1 - SAFETY ASSESSMENT IN RESPONSE TO REQUEST FOR INFORMATION PURSUANT TO 10 CFR 50.54(f) - RECOMMENDATION 9.3 COMMUNICATIONS ASSESSMENT (TAC NO. MF0012)
Dear Sir or Madam By letter dated March 12,2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Section 50. 54 (f) to Title 10 of the Code of Federal Regulations (henceforth referred to as the 50.54(f) letter). The request was issued as a part of implementing lessons learned from the accident at the Fukushima Dai-ichi nuclear power plant. to the 50.54(f) letter contained specific requested information associated with the NRC's Near-Term Task Force Recommendation 9.3 for emergency preparedness communications. Specifically, the letter requested that licensees provide an assessment of the current communications systems and equipment used during an emergency event.
By letter dated October 31,2012, Entergy Operations, Inc. (the licensee), responded to this request for Grand Gulf Nuclear Station, Unit 1. In response to NRC staff questions, the licensee provided additional information by letter dated February 21, 2013.
The NRC staff has reviewed the communications assessment for Grand Gulf Nuclear Station, Unit 1, and, as documented in the enclosed safety assessment, determined that the assessment for communications is reasonable, and the interim measures, analyzed existing systems, and proposed enhancements will help to ensure that communications are maintained.
Further, in coordination with the Near-Term Task Force Recommendation 4.2 (mitigating strategies), the NRC staff plans to follow up with the licensee to confirm that upgrades to the site's communications systems have been completed.
- 2 If you have any questions, please contact me at 301-415-1445 or via e-mail at alan.wang@nrc.gov.
Sincerely, i 11A.'tt 0dCLf\\~___
'J Alan B. Wang, Project Manager Plant licensing Branch IV Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket No. 50-416
Enclosure:
As stated cc w/encl: Distribution via listserv
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 SAFETY ASSESSMENT BY THE OFFICE OF NUCLEAR REACTOR REGULATION REVIEW OF ASSESSMENT OF COMMUNICATIONS IN RESPONSE TO REQUEST FOR INFORMATION DATED MARCH 12,2012 ENTERGY OPERATIONS, INC.
GRAND GULF NUCLEAR STATION, UNIT 1 DOCKET NO. 50-416
1.0 INTRODUCTION
By letter dated March 12, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12053A340), the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Section 50.54(f) to Title 10 of the Code of Federal Regulations (10 CFR) (henceforth referred to as the 50.54(f) letter). The request was issued as a part of implementing lessons learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 5 to the 50.54(f) letter contained specific requested information associated with the NRC's Near-Term Task Force Recommendation 9.3 for emergency preparedness communications. Specifically, the letter requested that licensees provide an assessment of the current communications systems and equipment used during an emergency event.
By letter dated October 31, 2012 (ADAMS Accession No. ML12306A245), as supplemented by letter dated February 21, 2013 (ADAMS Accession No. ML13053A091), Entergy Operations, Inc. (Entergy), the licensee for Grand Gulf Nuclear Station, Unit 1 (GGNS), provided an assessment of its communications capabilities in response to the NRC's request for information.
Within the licensee response letter, an assessment of the current communications systems and equipment to be used during an emergency event was performed to identify any enhancements needed to ensure communications are maintained during and following a beyond design basis large-scale natural event. In this assessment, it was assumed that a large-scale natural event causes: (1) a loss of all alternating current (ac) power, and (2) extensive damage to normal and emergency communications systems both onsite and in the area surrounding the site (i.e.,
within 25 miles of the site, consistent with the guidance endorsed by the NRC's letter dated May 15, 2012 \\
Additionally, interim actions were identified by the licensee during the period of implementation of the planned improvements to the communications systems or procedures.
Skeen, D. L., U.S. Nuclear Regulatory Commission, letter to Susan Perkins-Grew, Nuclear Energy Institute, "U.S. Nuclear Regulatory Commission Review of NEI12-01, 'Guideline for Assessing Beyond Design Basis Accident Response Staffing and Communications Capabilities,' Revision 0," dated May 2012," dated May 15, 2012 (ADAMS Accession No. ML12131A043).
Enclosure
- 2
1.1 Background
On March 12, 2012, the NRC issued a letter entitled "Request for Information Pursuant to Title 10 of the Code of Federal Regulations SO.S4(f) regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident." In accordance with 10 CFR SO.S4(f), addressees were requested to submit a written response to the information requests within 90 days.
The SO.S4(f) letter stated that if an addressee cannot meet the requested response date, then the addressee must respond within 60 days of the date of the letter, and describe the alternative course of action that it proposes to take, including any estimated completion date. By letter dated May 9,2012 (ADAMS Accession No. ML12130A418), the licensee committed to submitting its completed communications assessment and implementation schedule by October 31,2012. By letter dated June 8,2012 (ADAMS Accession No. ML 12163AS48), the licensee also provided a description of any interim actions (discussed in further detail in Section 3.0) that have been taken or are planned to be taken to enhance existing communications systems power supplies until the communications assessment and the resulting actions are complete. The NRC staff found the proposed schedule acceptable by letter dated July 26,2012 (ADAMS Accession No. ML12200A106).
Enclosure S of the SO.S4(f) letter contained specific requested information associated with NRC's Near-Term Task Force Recommendation 9.3 for emergency preparedness communications. Specifically, the letter requested that licensees provide an assessment of the current communications systems and equipment used during an emergency event to identify any enhancements that may be needed to ensure communications are maintained during a large-scale natural event and subsequent loss of ac power. The licensee's assessment should:
identify any planned or potential improvements to existing on site communications systems and their required normal and/or backup power supplies; identify any planned or potential improvements to existing offsite communications systems and their required normal and/or backup power supplies; provide a description of any new communications system(s) or technologies that will be deployed based upon a large-scale natural event and extensive damage to normal and emergency communications systems both onsite and offsite; and provide a description of how the new and/or improved systems and power supplies will be able to provide for communications during a loss of all ac power.
The SO.S4(f) letter also requested the licensees to:
describe any interim actions that have been taken or are planned to be taken to enhance existing communications systems power supplies until the communications assessment and the resulting actions are complete; and provide an implementation schedule of the time needed to conduct and implement the results of the communications assessment.
- 3
2.0 REGULATORY EVALUATION
The NRC staff reviewed the licensee's responses to the 50.54(f) letter against the regulations and guidance described below.
2.1 Regulations Section 50.47, "Emergency plans," of 10 CFR Part 50, sets forth emergency plan requirements for nuclear power plant facilities.
Section 50.47(b) establishes the standards that the onsite and offsite emergency response plans must meet for NRC staff to make a positive finding that there is reasonable assurance that the licensee can and will take adequate protective measures in the event of a radiological emergency. Planning Standard (6) of this section requires that a licensee's emergency response plan contain provisions for communications among principal response organizations to emergency personnel and to the public. Planning Standard (8) requires that adequate emergency facilities and equipment to support emergency response are provided and maintained.
Section IV.D, "Notification Procedures," of Appendix E, "Emergency Planning and Preparedness for Production and Utilization Facilities," to 10 CFR Part 50, requires that a licensee have the capability to notify responsible State and local governmental agencies within 15 minutes after declaring an emergency. The design objective of the prompt public alert and notification system shall be to have the capability to complete the initial alerting and initiate notification of the public within the plume exposure pathway within about 15 minutes. This alerting and notification capability will include a backup method of public alerting and notification.
Section IV.E, "Emergency Facilities and Equipment," of Appendix E to 10 CFR Part 50, states that adequate provisions shall be made and described for emergency facilities including at least one onsite and one offsite communications system; and each system shall have a backup power source. These arrangements will include:
- a.
Provision for communications with contiguous State/local governments within the plume exposure pathway emergency planning zone.
- b.
Provision for communications with Federal emergency response organizations.
- c.
Provision for communications among the nuclear power reactor control room, the onsite technical support center, and the emergency operations facility; and among the nuclear facility, the principal State and local emergency operations centers, and the field assessment teams.
- d.
Provisions for communications by the licensee with NRC Headquarters and the appropriate NRC Regional Office Operations Center from the nuclear power reactor control room, the onsite technical support center, and the emergency operations facility.
-4 2.2 Guidance Nuclear Energy Institute (NEI) 12-01, Revision 0, "Guideline for Assessing Beyond Design Basis Accident Response Staffing and Communications Capabilities," dated May 2012, presents a methodology for licensees to analyze their ability to perform critical communications during and after a large-scale natural event. NRC staff has previously reviewed NEI 12-01 (ADAMS Accession No. ML12131A043), and determined that it was an acceptable method for licensees to use in responding to the 50.54(f) letter.
The NRC staff reviewed the licensee's analyses against the assumptions and guidance within NEI 12-01, Sections 2.2, 2.4, and 4. These sections provide a discussion on the assumptions and criteria to be used for a communications assessment.
In its October 31, 2012 letter, as supplemented by letter dated February 21,2013, the licensee submitted its assessment of communications assuming a large-scale natural event, which would lead to an extended loss of all ac power. This letter included a discussion of required communications links, primary and backup methods of communications, and any identified improvements.
3.0 TECHNICAL EVALUATION
In its October 31,2012 letter, as supplemented by letter dated February 21,2013, the licensee submitted its assessment of communications assuming a large-scale natural event, which would lead to an extended loss of all ac power. This letter included a discussion of required communications links, primary and backup methods of communications, and any identified improvements.
3.1 Communication Areas Reviewed 3.1.1 Communication Links GGNS currently has communications capabilities with offsite response organizations (OROs),
the NRC, between licensee emergency response facilities (ERFs), with field and offsite monitoring teams, and with in-plant and offsite licensee emergency response organization staff.
As part of its communications assessment, the licensee has determined that many of the communications equipment described in its emergency plan can be assumed to not be available. However, certain existing onsite communications system equipment, such as existing site radios would be available after implementation of planned enhancements, for communication links listed above given a seismic, high wind, or flooding event.
As an interim measure prior to the implementation of all planned enhancements, the licensee has distributed satellite phones to the ERFs including the emergency operations facility, technical support center/operations support center, control room, and joint information center.
Additionally, the licensee has purchased additional radios and spare batteries for the site. This purchased equipment will be used in conjunction with existing satellite phones and site radios until the final implementation of all planned enhancements. The radios are able to function without repeaters; however, the primary onsite repeater will have backup power. User aids will be stored with the satellite phones and there is an existing licensee staff familiarity with the
- 5 radios. The satellite phones and radios are stored in hardened/cushioned cases within the ERFs for protection.
As the planned enhancement, the licensee plans to ensure that a portable satellite telephone or radio communications are available for needed communication links outlined in Section 4 of NEI12-01.2 Enhancements to equipment protection, such as anchoring equipment to prevent impacts from a seismic event, will be made to help ensure that the equipment is available following a large-scale natural event. The licensee is implementing planned improvements for communications with OROs, by ensuring each organization has a portable satellite phone.3 The licensee will put these enhancements in place, with licensee-approved procedures by March 17, 2016.
The NRC staff has reviewed the licensee's expected communications links within its communications assessment. In reviewing the licensee's submittal, the NRC staff considered whether it is reasonable that each communication link can be maintained, after the implementation of all planned enhancements, in accordance with the NRC-endorsed NEI 12-01 guidance. The portable satellite telephones, as well as radio communications are expected to help maintain communications offsite and between emergency response facilities by their ability to function without infrastructure postulated to be damaged by a large-scale natural event, coupled with further enhancements to be made for equipment protection. The NRC staff concludes that since the licensee's assessment for the availability of communications systems is reasonable, and planned enhancements are to be made for communications areas to help ensure reliability, the licensee's interim measures and proposed enhancements will help to ensure that communications are maintained consistent with the assumptions in NRC-endorsed guidance of NEI 12-01.
3.1.2 Equipment Location Entergy has determined the survivability of its existing equipment for large-scale natural events by crediting equipment located in seismically analyzed buildings. The capacity of the equipment in its current configuration was evaluated in its ability to withstand the external hazards as identified in the NEI 12-01 guidance. These hazards include seismic, flooding, and high winds.
The licensee's evaluation was based on engineering judgment developed by a consensus of experienced engineers in structural design and construction using the guidance provided in Electric Power Research Institute (EPRI) NP-6041, "Nuclear Power Plant Seismic Margin." The 50.54(f) letter states in part, that EPRI NP-6041 provides acceptable guidance for seismic protection walk downs.
The NRC staff reviewed the licensee's submittal and verified that the licensee has considered the equipment location and protection contained within the NRC's endorsed guidance of NEI 12-01. The NRC staff also verified that all equipment discussed in Section 3.1.1 of this document has been analyzed to be available after a large-scale natural event; actions will be taken for its protection; or would be stored in a reasonably protected area from seismic, 2
This is discussed in the licensee's February 21, 2013, response to Technical Issue 2. The NRC staff will be verifying under Near-Term Task Force Recommendation 4.2 (mitigating strategies), that communications are available for each link.
3 Radio communications are also expected to be available at a few OROs,
- 6 flooding, and high-wind events as discussed in NEI12-01. The NRC staff also ensured that ancillary equipment, such as batteries would be protected from seismic, flooding, and high-wind events.
Based on this review, the NRC staff concludes that the licensee's analysis of communications assessment equipment survivability and proposed enhancements for equipment location is consistent with NRC-endorsed NEI 12-01 guidance. This determination of equipment protection, support the conclusion that these measures will help to ensure communications equipment availability for a large-scale natural event.
3.1.3 Equipment Power and Fuel Entergy has analyzed the availability of its communications system power supplies following the loss of all ac power. The licensee has proposed a combination of batteries and uninterrupted power supplies (UPSs) to power site communications equipment, including the satellite phones, radios, and extra batteries for this equipment. The site strategies will result in: (1) each satellite phone will be provided for a 24-hour power supply capability through batteries; (2) radios will be provided for a 24-hour power supply capability through batteries; and (3) UPSs will provide 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of back-up power for radio repeater systems.
The NRC staff has reviewed the licensee's communications assessment power supplies. In reviewing the submittal, the NRC staff concludes that it is reasonable that power for the existing equipment and proposed enhancement equipment, as listed in Section 3.1.1 of this document, would remain available for 24-hour duration, based on the availability of extra batteries.
Additionally, the licensee's interim measures and proposed enhancements are in accordance with NRC-endorsed guidance of NEI 12-01.
Based on this review, the NRC staff concludes that the licensee's analysis of equipment power and proposed enhancements for equipment power is consistent with NRC-endorsed NEI 12-01 guidance. This determination of available equipment power supports the conclusion that these measures will help to ensure communications equipment functionality for a large-scale natural event.
3.1.4 Proceduralization and Training Entergy has confirmed that there are sufficient reserves of equipment to minimize the need of multi-use equipment for different communication functions. The licensee plans to revise existing site procedures for inventory checks and testing of the new portable satellite phones and the radios. The licensee's staff will be trained on equipment location and use of this communications equipment by March 17,2016.
General employee training procedures will be updated to include direction regarding actions to be taken by plant employees following the observation of a large-scale natural event should the public address system be unavailable. The licensee has procedures in place for emergency response organization self-activation due to major disturbances in the power grid. These site capabilities will activate the offsite emergency response organization and notify the plant staff.
- 7 The NRC staff reviewed the licensee's commitments on the planned quality assurance and maintenance of the equipment and licensee staff training on the use of this equipment. The NRC staff determined that the licensee's submittal is in accordance with the NRC-endorsed guidance of NEI 12-01.
Based on this review, the NRC staff considers the licensee's planned proceduralization of equipment use and licensee staff training to be consistent with NRC-endorsed guidance of NEI 12-01. This determination of equipment availability and functionality, support the conclusion that these measures will help to ensure communications equipment functionality for a large-scale natural event.
3.2 Regulatory Commitments In response to 50.54(f) letter, the licensee made the following regulatory commitment in its letter dated October 31, 2012, which is applicable to this assessment and will be implemented prior to startup from Refueling Outage (RFO) Spring 2016):
Enhancements identified within the assessment (GNRO-2012/00131. ) will be further developed as implementation progresses. Alternate approaches will be utilized if prudent (e.g., alternate/new technology, improved capability, cost savings, etc.). These enhancement commitments are subject to change as a result of Diverse and Flexible Coping Strategies (FLEX) developments, advances in technology, and progress in the manner of addressing the need for these enhancements.
The NRC staff concludes that reasonable controls for the implementation and for the subsequent evaluation of the proposed changes pertaining to the above regulatory commitment is best provided by the licensee's administrative processes, including its commitment management program. The regulatory commitment above does not warrant the creation of regulatory requirements (items requiring prior NRC approval of subsequent changes).
4.0 CONCLUSION
The NRC staff has reviewed the licensee's communications assessment for communications with or among: OROs, the NRC, licensee emergency response facilities. field and offsite monitoring teams, and on-site and in-plant response teams. In reviewing the licensee's submittal. the NRC staff considered the factors outlined above, and determined that its assessment of existing equipment, proposed enhancements and interim actions was in accordance with the NRC-endorsed guidance of NEI 12-01. The NRC staff concludes that the licensee's assessment for communications is reasonable, and the licensee's interim measures, analyzed existing systems, and proposed enhancements will help to ensure that communications are maintained. Further, in coordination with the Near-Term Task Force Recommendation 4.2 (mitigating strategies), NRC staff is planning on following up with the licensee to confirm that upgrades to the site's communications systems have been completed.
Principal Contributor: R. Chang, NSIR/NRLB Date: May 28. 2013
- 2 If you have any questions, please contact me at 301-415-1445 or via e-mail at alan,wang@nrc.gov.
Sincerely, IRAJ Alan B. Wang. Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-416
Enclosure:
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