ML060740444

E-mail: AMR Questions (PD)

ML060740444
Person / Time
Site:	Oyster Creek
Issue date:	10/18/2005
From:	Ashley D NRC/NRR/DRIP/RLEP
To:	Hufnagel J Exelon Corp
References
%dam200606
Download: ML060740444 (2)

Text

I D. Ashley - AMR questions I D.Asle AM

. ., ston . ,,. . .I.. Page Pag 10 1l From: D. Ashley To: John Hufnagel Date: Tue, Oct 18, 2005 3:40 PM

Subject:

AMR questions John -

Greg Cranston asked that I forward these to you. Please note that these are for the upcoming AMR audit.

- Donnie Ashley AMR-1: The OGGS LRA contains 217 references to TLAAs in the AMR tables. All but a few cite cumulative fatigue damage as the aging effect requiring management. After review of the information contained in the LRA, Chapters 3 and 4, the project team has a number of questions related to TLAAs for cumulative fatigue damage:

(a) In following the AMR line item references for mechanical components back to the Table 1 entries, then to the further evaluations, and finally to LRA Section 4.3, it is not always clear whether a CLB fatigue analysis actually exists or whether the TLAA is addressed by the 7,000 assumed cycles in accordance with B31.1 or equivalent design methods. To clarify this, please identify the applicable disposition for each TLAA line item related to cumulative fatigue damage of mechanical components (piping, fittings, nozzles, valves, pumps, etc.) Also identify which subsecticin of LRA 4.3 applies.

(b) In the LRA Section 3.1, 3.2, 3.3 and 3.4 AMR tables, there are a number of references to TLAAs related to cumulative fatigue damage of bolted closures. The intended function is pressure boundary or leakage boundary. Normally a bolted closure in azpressure retaining boundary is designed such that there is no load cycling in the bolts, because they are very susceptible to fatigue failure, by nature of the as-designed stress raiser at the root of the threads. Load cycling is essentially eliminated by use of bolt preload. Please clarify and provide more detail related to these specific AMR table line items.

AMR-2: A large number of AMR line items in LRA Sections 3.1 through 3.6 reference further evaluations, which are provided in the LRA Sections 3.1.2.2 through 3.6.2.2, respectively. Please ensure that the technical basis document for each further evaluation in LRA Sections 3.1.2.2 through 3.6.2.2 is available for review by the project team during the on-site AMR audit, preferably in both hard-copy and electronic formats.

AMR-3: The OCGS LRA was developed based on the January 2005 draft version of the updated GALL. A final updated version of GALL, released in September 2005, may contain revisions that are applicable to the OCGS LRA. Please provide a documented reconciliation (identification of applicable differences and a technical assessment of significance) between the AMRs in the OCGS LRA and the recommendations in the September 2005 GALL final update.

II c:\temi)\GW)00001.TMP

.:tm\G IOO .TM Page  ;

Pag =1i.............

..'I ...

Mail Envelope Properties (43554F9F.BOC: 9:10848)

Subject:

AMR questions Creation Date: Tue, Oct 18, 2005 3:40 PM From: D. Ashley Created By: DJA1 @nrc.gov Recipients Action Date & Time exeloncorp.com Transferred 10/18 3:41 PM john.hufnagel (John Hufnagel)

Post Office Delivered Route exeloncorp.com Files Size Date & Time MESSAGE 3462 Tuesday, October 18, 2005 3:40 PM Options Auto Delete: No Expiration Date: None Notify Recipients: No Priority: Standard Reply Requested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened