ML052840052

E-mail from Ngoc Le to David Dellario Draft RAIs for Nine Mile Point Amended License Renewal Application

ML052840052
Person / Time
Site:	Nine Mile Point
Issue date:	09/27/2005
From:	Le N NRC/NRR/DRIP/RLEP
To:	Dellario D Constellation Generation Group
Le N. B., NRR/DRIP/RLEP, 415-1458
Shared Package
ML052800393	List: ML052800399 ML052840052
References
TAC MC3272, TAC MC3273
Download: ML052840052 (6)

Text

Ngoc Le -Draft RAls for NMP Amended LRA - Batch 1 [9-27-2005]

} Page 1ii From:

Ngoc Le To:

David Dellario Date:

9/27/05 4:49PM

Subject:

Draft RAls for NMP Amended LRA - Batch 1 [9-27-20051 David:

Attached is the first set of the staff RAls for the NMP amended LRA review.

Please review and let me know when you would like to have a telecon to discuss the draft with the staff reviewer.

Then we will docket the RAls. Normally you will have 30 days to respond; however, the sooner you provide the responses, the better for the staff.

tommy CC:

Hansraj Ashar; Peter.Mazzaferro@Constellation.com; Samson Lee

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Draft RAIs for NMP Amended LRA - Batch 1 [9-27-2005]

9/27/05 4:49PM Ngoc Le NBL@nrc.gov Recipients owf4_po.OWFNDO SSL1 CC (Samson Lee)

Action Delivered Opened Date & Time 09/27/05 4:49 PM 09/28/05 6:51 AM Constellation.com David.Dellario (David Dellario)

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Delivered Opened 09/27/05 4:49 PM 09/29/05 8:48 AM Post Office owf4_po.OWFN_DO OWGWPO01.HQGWDO01 Delivered 09/27/05 4:49 PM Route Constellation.com nrc.gov 09/27/05 4:49 PM Files Size MESSAGE 837 ALRA_2.4RAI-SeptO5jHAshar.wpd Date & Time 09/27/05 04:49PM 13150 09/27/05 04:39PM Options Auto Delete:

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Draft RAIs for NMP Amended LRA - Batch 2 [9-29-2005]

9/29/05 6:01PM Ngoc Le NBL@nrc.gov Recipients OWGWPO01.HQGWDO01 JKB CC (Joseph Bums) owf4_po.OWFNDO SSL1 CC (Samson Lee)

Action Delivered Opened Delivered Opened Date & Time 09/29/05 6:01 PM 10/03/05 7:14 AM 09/29/05 6:01 PM 09/30/05 6:43 AM Constellation.com David.Dellario (David Dellario)

Peter.Mazzaferro CC (Peter.Mazzaferro@Cons Transferred 09/29/05 6:02 PM Post Office OWGWPO0I.HQGWDOOI owf4-po.OWFNDO Delivered 09/29/05 6:01 PM 09/29/05 6:01 PM Route Constellation.com Files Size MESSAGE 875 ALRAJBums_RAI_9_29_05.DOC Date & Time 09/29/05 06:01PM 25600 09/29/05 05:58PM Options Auto Delete:

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REQUEST FOR ADDITIONAL INFORMATION NINE MILE POINT NUCLEAR STATION. UNIT 1 AMENDED LICENSE RENEWAL APPLICATION (Section 2.4 of LRA)

RAI 2.4.A-1 The amended LRA (ALRA) section 2.4.A.1 incorporates the thrust of this RAI, except that it is not clear if the refueling seal between the refueling cavity and the drywell is within the scope or not. RAI 2.4.A-2 describes the concern.

RAI 2.4.A-2 Leakage through the refueling seals located at the top of the drywell potentially exposes the carbon steel drywell shell inner and outer surfaces to loss of material due to corrosion. This is a particular concern for the embedded portion of the drywell shell. Corrosion detected on the outer shell surface in the sand pocket region in a number of Mark I steel containments has been attributed to leakage past the drywell-to-reactor building refueling seal, coupled with clogging of the sand pocket drains. Leakage into the drywell, past the reactor vessel-to-drywell refueling seal, creates the potential for corrosion of the inaccessible portion of the inner surface of the drywell shell, embedded in the concrete floor.

From the information contained in Table 2.4.A.1-1 of the amended LRA, it is not clear to the staff (1) whether the refueling seals have been included in the license renewal scope, and (2) if included, how aging management is being addressed. Therefore, the applicant is requested to provide the following information:

1. Verification that the refueling seals are included in the license renewal scope, or a detailed explanation for their exclusion.

2. A detailed description of the plant-specific operating experience for the refueling seals, including incidences of degradation, method of detection, root cause, corrective actions, and current inspection procedures.

3. A detailed description of the scoping, screening, and aging management review for the refueling seals.

4. The aging management program(s) credited to manage aging of the refueling seals.

RAI 2.4.C.1-1 RAI 2.4.B -1 RAI 2.4.B -2 In Table 2.4.C-1 of the ALRA, the applicant includes ASME Class 1, 2, 3 and MC hangers and supports. The staff assumes that the drywell and torus external supports are included within the Class MC supports. The applicant is requested to confirm the staff's assumption.

Section 2.4.B.1 of the ALRA incorporates the thrust of this RAI.

Section 2.4.B.1 of the ALRA incorporates the thrust of this RAI.

NINE MILE POINT UNITS 1 AND 2 AMENDED LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION TAC NUMBERS MC3272 AND MC3273 (SRXB)

Reference:

SECTION 2.3 - NMP Amended LRA Batch 2-9/29/2005 RAI 2.3-1. For Nine Mile Point Unit 1 (NMP1), please indicate whether the liquid poison pressure nozzle is considered a reactor pressure vessel penetration requiring an Aging Management Review (AMR). (ALRA section 2.3)

RAI 2.3-2. For Nine Mile Point Unit 2 (NMP2), please indicate whether temperature equalizing columns should be identified as reactor pressure vessel instrumentation system components requiring an AMR. (ALRA section 2.3)

RAI 2.3-3. Not used RAI 2.3-4. For NMP1, the Liquid Poison System contains two elements that monitor the Liquid Poison Storage Tank temperature. One of these components is in-scope for License Renewal since it is a safety-related component. The other component is non-safety-related and has no License Renewal intended function. The in-scope temperature element itself is an active component and, therefore, not subject to AMR. However, the temperature sensor is housed in a thermowell that is subject to AMR. Please indicate which temperature element is the in scope element, is it TE 41-35 or TE 41-28? (ALRA section 2.3)

RAI 2.3-5. For NMP2, please indicate whether the diffuser seal ring and shroud support plate should be identified as a reactor pressure vessel internal component requiring an AMR. (ALRA section 2.3)

NINE MILE POINT UNITS 1 AND 2 AMENDED LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION TAC NUMBERS MC3272 AND MC3273 (SRXB)

Reference:

SECTION 2.3 - NMP Amended LRA Batch 2-9/29/2005 RAI 2.3-1. For Nine Mile Point Unit 1 (NMP1), please indicate whether the liquid poison pressure nozzle is considered a reactor pressure vessel penetration requiring an Aging Management Review (AMR). (ALRA section 2.3)

RAI 2.3-2. For Nine Mile Point Unit 2 (NMP2), please indicate whether temperature equalizing columns should be identified as reactor pressure vessel instrumentation system components requiring an AMR. (ALRA section 2.3)

RAI 2.3-3. Not used RAI 2.3-4. For NMP1, the Liquid Poison System contains two elements that monitor the Liquid Poison Storage Tank temperature. One of these components is in-scope for License Renewal since it is a safety-related component. The other component is non-safety-related and has no License Renewal intended function. The in-scope temperature element itself is an active component and, therefore, not subject to AMR. However, the temperature sensor is housed in a thermowell that is subject to AMR. Please indicate which temperature element is the in scope element, is it TE 41-35 or TE 41-28? (ALRA section 2.3)

RAI 2.3-5. For NMP2, please indicate whether the diffuser seal ring and shroud support plate should be identified as a reactor pressure vessel internal component requiring an AMR. (ALRA section 2.3)