ML083110181
| ML083110181 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 11/03/2008 |
| From: | Gallagher M AmerGen Energy Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML083110181 (6) | |
Text
Michael P. GallagheT, PE Telephone 610.765.5958 AmerGen SM An Exelon Company Vice President www.exeloncorp.com License Renewal Projects michaelp.gallagher@exeloncorp.com 10 CFR 50 Am erGen 10 CFR 51 200 Exelon Way 10 CFR 54 KSA/2-E Kennett Square, PA 19348 5928-08-20224 November 3, 2008 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Three Mile Island Nuclear Station, Unit 1.
Facility Operating License No. DPR-50 NRC Docket No.50-289
Subject:
Supplement to AmerGen Response to NRC Request for Additional Information related to Three Mile Island Nuclear Station, Unit 1, License Renewal Application.
Reference:
AmerGen response (Letter # 5928-08-20197 dated September 19th, 2008.) to "Request for additional information for Sections 2.2, 2.3, 2.4 and 2.5 of the Three Mile Island Nuclear Station, Unit 1, License Renewal Application", (TAC No.
MD7701)
In the referenced letter, AmerGen responded to NRC Requests for Additional Information (RAI) 2.4.10-1 and 2.4.12-1. During the NRC Staff review of this response, it was determined that a clarification to the responses was needed. The Enclosure to this letter provides that clarification.
The RAI questions along with the original responses is repeated. New information included in the response is displayed in bolded italic font for ease of identification.
This letter and its enclosure contain no commitments.
If you have any questions, please contact Fred Polaski, Manager License Renewal, at 610-765-5935.
I declare under penalty of perjury that the foregoing is true and correct.
Respectfully, Executed on //,1 - .2a3y Mic-hael P. Gallagher Vice President, License Renewal AmerGen Energy Company, LLC A2)
November 3, 2008 Page 2 of 2 5928-08-20196 Enclosure A: Clarification to RAI responses 2.4.10-1 and 2.4.12-1.
cc: Regional Administrator, USNRC Region I, w/Enclosure USNRC Project Manager, NRR - License Renewal, Safety, w/Enclosure USNRC Project Manager, NRR - License Renewal, Environmental, w/o Enclosure USNRC Project Manager, NRR - TMIGS, w/o Enclosure USNRC Senior Resident Inspector, TMIGS, w/o Enclosure File No. 08001
November 3, 2008 Page 1 of 3 5928-08-20196 Enclosure A Enclosure - A Clarification to RAI responses 2.4.10-1 and 2.4.12-1.
November 3, 2008 Page 2 of 3 5928-08-20196 Enclosure A RAI # 2.4.10-1 Section 2.4.10 of the LRA, Mechanical Draft Cooling Tower (MDCT) Structures, states that the intended function of the MDCT basin is to provide structural support and a flow path for the inlet and outlet river discharge piping. Within the current licensing basis, please justify the LRA statement that the failure of the building, adjoining TMI-2 structure, and sodium bisulfate tank foundation and dike does not affect the intended functions of the MDCT basin.
AmerGen Response The building, adjoining TMI-2 structure, and sodium bisulfate tank foundation are nonsafety-related structures per the current licensing basis. These structures are not credited with performing any intended functions for License Renewal. Failure of these structures will not affect any intended functions for safety-related Systems, Structures and Components (SSCs) and they are not relied on to demonstrate compliance with any of the 5 regulated events identified per 10 CFR 54.4 (a)(3).
The closest safety-related SSC is piping at the entrance and exit to the MDCT basin which is more than 6 feet below grade or contained within the MDCT basin. This piping performs a pressure boundary intended function for License Renewal that would not be affected by failure of these structures. The piping is protected either by the soil or by the very robust reinforced concrete of the in-scope MDCT basin which is constructed of 2'6" thick reinforced concrete exterior walls and base slab and a 2'0" thick reinforced concrete roof. The MDCT basin roof is also supported by 2'0" thick interior reinforced concrete walls.
For an SSC to be included in scope for License Renewal per 10 CFR 54.4(a)(2) the SSC must be nonsafety-related whose failure could impact an intended function of a safety-related SSC.
Since the soil above the pipe or the MDCT basin protects the associated safety-related piping, failure of the not in scope structures noted above cannot impact an intended function for a safety-related SSC. Also, there are no hypothetical failures for the MDCT Structures in the currentlicensing basis.Therefore, these structures were determined not to be in scope for License Renewal.
November 3, 2008 Page 3 of 3 5928-08-20196 Enclosure A RAI # 2.4.12-1 Section 2.4.12 of the LRA, Natural Draft Cooling Towers, states that the intended function of the reinforced concrete basin is to provide structural support and a flow path for the Circulating Water Pump House. Within the current licensing basis, please justify the LRA statement that the failure of the reinforced concrete hyperbolic towers, the wooden fill structure, and the canopy at the base of the towers does not affect the intended functions of the basin.
AmerGen Response The reinforced concrete hyperbolic towers, the wooden fill structure, and the canopy are nonsafety-related portions of the Natural Draft Cooling Towers (NDCTs) per the current licensing basis. They are not credited with performing any intended functions for License Renewal. Failure of these portions of the NDCTs could affect the intended functions for the nonsafety-related, in-scope (a)(2) basins. However, this does not require that these structures be included in scope for License Renewal per 10 CFR 54.4(a)(2).
For an SSC to be included in scope for License Renewal per 10 CFR 54.4(a)(2), the SSC must be nonsafety-related whose failure could impact an intended function for a safety-related SSC.
Since none of the above structures'or the in-scope basin are safety-related, a failure cannot impact a safety-related SSC intended function. Also, there are no hypothetical failures for the reinforcedconcrete hyperbolic towers, the wooden fill structureand the canopy at the base of the towers in the currentlicensing basis. Therefore, these structures were determined not to be in-scope for License Renewal.
NSRB TMI REGULATORY ASSURANCE CORRESPONDENCE DISTRIBUTION - INFORMATION SHEET Letter No. 5928 - 08 - 20224 Letter bate: 11/3/08 Engineer/Coordinator C. Wilson ETTS Assignee: -__- -DOC's (OPEN)
DOC'S (CLOSED)
Supplement to AmerGen Respoonse to NRC RAI re. TMI-1 LRA SUBJECT FILE:
DISTRIBUTION DATE: 11/3/08 Letter 5928-08-20197 dated 9/19/08 REF: sections 2.3.3 and 2.3.4.
TMi- 1 Senior Staff TMI-1 Plant Division TMI- 1Lic./*el.Assur.NB*.
W Nail, TMI VP OSF-2 R S Campbell, Supertindent OPS P B Cowan, Dir Licensing KSA-3E I L Hydrick, Mgr, Bus Ops NOB-2 J C Wend, Dir P/H & Safety OOB-1 D P Helker, Mgr TMI Lic KSA-3E V E Rapczynski, Mgr Comm KSA-3N C Baker - Mgr RAW & Chem OOB-1 P L Faletti, NSRB Coord KSA-3E J Heischman, Dir Maint Svc Bldg , Mgr OPS OOB-2 , Lic. Eng KSA-3E T J Dougherty, Plant Manager OOB-2 L Troiano OOB-2 A W Miller, Reg Assur Eng NOB-2 V J C Wend, Dir Trng Trg Ctr. S R Cogley, Environ Eng NOB-2 D Hockley S/A Coord NOB-2 V S P Queen, Dir Site Eng NOB-3 H Yeldell, Dir Work Mgt OSF-2 C A Moody, Mgr HR NOB-2 D Atherholt, Mgr Reg Assur NOB-2 TM- S1 Engineering Division OB-3 DD W. B Carsky, Dir Operations, OOB-2 IjW5S Wilkerson, Mqr Eng Resp NOB-3 D Deboer NSA Sr Mar. Pit Eno. NOB-3 C Warlow I/
L Weir, Mgr NOS OSF-2 ,Mgr NIS Process Camp NOB-1 l H Crawford, Mgr RX NSSS NOB-3 ITYc-* lsEC J Valent, Mgr, Elec/Sys Eng, NOB-3 D Mohre, Mgr Security PC , Mgr Programs NOB-3
_B Shumaker, Mgr Mec/BOP Sys NOB-3
, Sr Mgr Design Eng NOB-3 EDMS ~NOB-2 P C Ezzo, Sr. Mgr Design NOB-3 Routing/Licensing NOB-2 , Mgr Mech/Struc NOB-3 Records Management KSA-IN _________________
Commitment Coordinator (Eist)KSA-3E TM!- 1 Training Divisioni __________________
J M urray, Ops Trng Mgr Trg Ctr Others TM- Work Management ANI/Oliveira I AAAAA Wni~mnn T Geyer, Mgr, Planning OSF-2 It MI-2 INP Re~cords H L Wilson, Supv Maint Assess OSF-2 J J Byrne, Mgr Decomm SOB-1 Fr'nmntnmnp/Mp~rrirh FramtomeMercich --
J Wood Oak Harbor, OH PA DEP M O'Reilly, Legal Akron, OH N Clarkson/Oconee Ler/NOV V Cwietniewicz, EP Mgr KSA 3N R Saunders, CNO Akron, OH K Jury, VP Exe. Corp Cantera i
D Neff, EP NOB-2 EFMR Monitoring Group (TMI submittal to NRC covy)
E Epstein EDMS INDEX LICENSING TABLE LOC: (X)TMI-1 ( )TMI-2 ( ) TMI-C ( )INTERNAL TITLE:
DOC TYPE: 3002 TOCO: USNPC TOPERS:
FROMCO:
FROMPERS: