ML090090132
| ML090090132 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 11/17/2008 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| Download: ML090090132 (4) | |
Text
1 PrairieIslandNPEm Resource From:
Richard Plasse Sent:
Monday, November 17, 2008 5:09 PM To:
Eckholt, Gene F.
Subject:
draft 2.4 RAIs Attachments:
Doc2.doc 2.4 RAIs (draft)
Hearing Identifier:
Prairie_Island_NonPublic Email Number:
263 Mail Envelope Properties (Richard.Plasse@nrc.gov20081117170800)
Subject:
draft 2.4 RAIs Sent Date:
11/17/2008 5:08:47 PM Received Date:
11/17/2008 5:08:00 PM From:
Richard Plasse Created By:
Richard.Plasse@nrc.gov Recipients:
"Eckholt, Gene F." <Gene.Eckholt@xenuclear.com>
Tracking Status: None Post Office:
Files Size Date & Time MESSAGE 18 11/17/2008 5:08:00 PM Doc2.doc 29690 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
REQUEST FOR ADDITIONAL INFORMATION SECTION 2.4: SCOPING AND SCREENING RESULTS: CONTAINMENTS, STRUCTURES, AND COMPONENT SUPPORTS PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. MD8513 & MD8514 RAI 2.4.1-1 Due to lack of clarity in LRA Tables 2.4.1-1 and 3.5.2-1, please confirm/clarify if the Spent Fuel Pool (SFP) Divider Gates, the SFP leak-chase channels, and the fuel transfer canal upending frame are structural components in the scope of license renewal and subject to an AMR. If yes, include their scoping, screening and AMR results, as appropriate, or clarify the location in the LRA where these components are included. If not, please provide justification for exclusion.
RAI 2.4.3-1 In USAR Section 12.2.6, the applicant states that in order to assure the stability and prevent toppling and over-travelling of the Containment Polar Crane or its components, the features incorporated in its design include: (i) up-kick lugs fastened to each truck; (ii) overturning locks fastened to each truck; (iii) positive wheel stops. Also, in USAR Section 12.2.9, the applicant indicates that the Spent Fuel Pool Bridge Crane, Auxiliary Building Crane and the Turbine Building Crane are protected against tipping, derailments and uncontrolled movements by features that include: (i) crane bridge and trolley being equipped with fixed, fitted rail yokes; (ii) positive wheel stops and bumpers. From LRA Section 2.4.3, Table 2.4.3-1 and Table 3.5.2-3, it is not clear if the above noted structural components and fasteners of the cranes are included in-scope of license renewal and subject to AMR. Please confirm if these crane components have been screened in as items requiring an AMR. If yes, indicate where these items have been included in the LRA. If not, provide the technical bases for their exclusion.
RAI 2.4.7-1 In LRA Section 2.4.7, the System Function Listing under Code RCV-04 Reactor Containment Vessels and their internal structures provide shielding against high energy line breaks indicates the intended function under Criterion 2 of 10 CFR 54.4(a), which corresponds to all non-safety related systems, structures and components whose failure could prevent satisfactory accomplishment of any of the functions identified in paragraph (a)(1) of 10 CFR 54.4. The comment under this item on LRA page 2.4-38 states that: Reactor Containment Vessels and their internal structures are designed to withstand the effects of high energy line breaks without loss of function. Reinforced concrete walls and steel structures inside each Reactor Containment Vessel shield safety related equipment from the effects of a HELB. The NRC staff finds that the above stated structures and structural components are generally safety-related and serve a Criterion 1 intended function and not Criterion 2 intended function. Please address the inconsistency.
RAI 2.4.7-2 Because of lack of clarity in LRA Tables 2.4.2-1, 2.4.7-1, 3.5.2-2, 3.5.2-7 and the corresponding LRA sections, please indicate where in the LRA are the scoping, screening and AMR results of Structural Supports (vertical and lateral, as appropriate) for Steam Generators, Reactor Coolant Pumps and the Reactor Vessel included. If these structural components were inadvertently not included, please provide their scoping, screening and AMR results.
RAI 2.4.8-1 Please confirm if there are any ductbanks and manholes in the yard that are safety-related or important-to-safety or required for regulated events that may be within the scope of license renewal and subject to AMR. If there are, please provide their scoping, screening and AMR results.
RAI 2.4.11-1 Section 1.3.2 of the USAR states that the plant screenhouse houses the cooling water pumps, fire pumps, circulating water pumps, trash racks and traveling screens. Due to lack of clarity in LRA Tables 2.4.11-1 and 3.5.2-11, please confirm the inclusion or exclusion of the trash racks and traveling screens as structural components within the scope of license renewal and subject to AMR. If they were not included as an oversight, please provide a description of their scoping and aging management review. If they are included elsewhere in the LRA, please indicate the location. If they are excluded from the scope of license renewal and AMR, please provide the basis for their exclusion.