ML13316B206
| ML13316B206 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 11/11/2013 |
| From: | Siva Lingam Plant Licensing Branch II |
| To: | Mackaman C Tennessee Valley Authority |
| References | |
| MF2852, MF2853 | |
| Download: ML13316B206 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Lingam, Siva Sent:
Monday, November 11, 2013 5:37 PM To:
'Mackaman, Clyde Douglas' Cc:
Quichocho, Jessie; Casto, Greg; Purciarello, Gerard; Hamm, Matthew
Subject:
RE: Sequoyah 1 and 2 UHS LAR (TS-SQN-13-01 and TS-SQN-13-02) Post Acceptance Review RAIs (TAC Nos. MF2852 and MF2853)
Please note the following official RAIs for the subject LAR, and provide your responses within 30 days:
- 1. Updated Final Safety Analysis Report (UFSAR) Section 3.1.1 in the paragraph labeled Period of Recovery identified Sequoyah as a hot standby plant. Also, UFSAR Section 9.2.2 states that the ERCW system design capability cannot adequately support a simultaneous shutdown and cool down of both units.
These statements did not exist in the original UFSAR.
The licensee is requested to provide the details and identify the approval process that made these changes to the UFSAR.
- 2. Section 3 of your October 2, 2013 submittal listed Regulatory Guide 1.27 guideline for the UHS and stated; The UHS should be capable of providing sufficient cooling for at least 30 days (a) to permit simultaneous safe shutdown and cooldown of all nuclear reactor units that it serves, and maintain them in a safe shutdown condition, and (b) in the event of an accident in one unit, to permit control of that accident safely and permit simultaneous safe shutdown and cooldown of the remaining units and maintain them in a safe shutdown condition. Procedures for assuring a continued capability after 30 days should be available.
Describe the calculations in place that show that the non-accident unit can be cooled down in a reasonable amount of time after the accident in the other unit? Describe the procedures in place that provide instructions for the operators to cool down the non-accident unit, if necessary.
- 3. The licensee used a Multiflow Model to predict ERCW flow through various components. The predicted flow was used to set UHS temperature limits to ensure the necessary amount of heat transfer takes place in the proposed Technical Specification change request. The NRC staff acknowledges that the licensee used a 5% flow reduction to add conservatism.
Describe flow measurement testing in the plant of the ERCW system that verifies the accuracy of the Multiflow Model for the various lineups proposed including the lineups of Table B 3/4.7-1 for both Units 1 and 2.
From: Lingam, Siva Sent: Monday, November 11, 2013 5:19 PM To: 'Mackaman, Clyde Douglas' Cc: Quichocho, Jessie; Casto, Greg; Elliott, Robert; Purciarello, Gerard; Hamm, Matthew
Subject:
Sequoyah 1 and 2 UHS LAR (TS-SQN-13-01 and TS-SQN-13-02) Acceptance Review (TAC Nos. MF2852 and MF2853)
By letter dated October 2, 2013 (ADAMS Accession No. ML13280A267), Tennessee Valley Authority submitted a license amendment request (LAR) for Sequoyah Nuclear Plant, Units 1 and 2. The LAR would revise the Technical Specifications (TSs) 3.7.5, Ultimate Heat Sink, to place additional limitations on the maximum average Essential Raw Cooling Water (ERCW) System supply header water temperature during operation with one ERCW pump per loop and operation with one ERCW supply strainer per loop. In addition, the one-time limitations on Unit 1 ultimate heat sink (UHS) temperature and the associated license condition
2 requirements used for the Unit 2 steam generator replacement project are proposed to be deleted. The proposed changes would place additional temperature limitations on the UHS TS Limiting Condition for Operation 3.7.5 with associated required actions, to support maintenance on plant component without requiring a dual unit shutdown. The purpose of this e-mail is to provide the results of the NRC staffs acceptance review of this LAR. The acceptance review was performed to determine if there is sufficient technical information in scope and depth to allow the NRC staff to complete its detailed technical review. The acceptance review is also intended to identify whether the application has any readily apparent information insufficiencies in its characterization of the regulatory requirements or the licensing basis of the plant.
The NRC staff has reviewed your application and concluded that it does provide technical information in sufficient detail to enable the NRC staff to complete its detailed technical review and make an independent assessment regarding the acceptability of the proposed LAR in terms of regulatory requirements and the protection of public health and safety and the environment. Given the lesser scope and depth of the acceptance review as compared to the detailed technical review, there may be instances in which issues that impact the NRC staffs ability to complete the detailed technical review are identified despite completion of an adequate acceptance review. If additional information is needed, you will be advised by separate correspondence.
If you have any questions, please contact me.
Siva P. Lingam U.S. Nuclear Regulatory Commission Project Manager (NRR/DORL/LPL2-2)
Sequoyah Nuclear Plant St. Lucie Plant Robinson Steam Electric Plant Location: O8-D5; Mail Stop: O8-G9a Telephone: 301-415-1564; Fax: 301-415-1222 E-mail address: siva.lingam@nrc.gov
Hearing Identifier:
NRR_PMDA Email Number:
914 Mail Envelope Properties (BE1CC4A72435624D84F8699734202B3E0128E12AE396)
Subject:
RE: Sequoyah 1 and 2 UHS LAR (TS-SQN-13-01 and TS-SQN-13-02) Post Acceptance Review RAIs (TAC Nos. MF2852 and MF2853)
Sent Date:
11/11/2013 5:37:03 PM Received Date:
11/11/2013 5:37:00 PM From:
Lingam, Siva Created By:
Siva.Lingam@nrc.gov Recipients:
"Quichocho, Jessie" <Jessie.Quichocho@nrc.gov>
Tracking Status: None "Casto, Greg" <Greg.Casto@nrc.gov>
Tracking Status: None "Purciarello, Gerard" <Gerard.Purciarello@nrc.gov>
Tracking Status: None "Hamm, Matthew" <Matthew.Hamm@nrc.gov>
Tracking Status: None
"'Mackaman, Clyde Douglas'" <cdmackaman@tva.gov>
Tracking Status: None Post Office:
HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 5086 11/11/2013 5:37:00 PM Options Priority:
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