ML20205E710: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot insert)
 
(StriderTol Bot change)
 
Line 17: Line 17:


=Text=
=Text=
{{#Wiki_filter:}}
{{#Wiki_filter:,
October 9, 1985 Docket No. 50-278 LICENSEE: Philadelphia Electric Company FACILITY: Peach Bottom Atomic Power Station, Unit No. 3
 
==SUBJECT:==
MEETING
 
==SUMMARY==
- 316 L STAINLESS STEEL RECIRCULATION OUTLET SAFE END CRACKING A meeting was held on October 1,1985 in Bethesda, Maryland between representatives of Philadelphia Electric and the NRC staff to discuss the cracking identified in the Recirculation System outlet safe ends. A list of the attendees is enclosed (Enclosure 1). A copy of the presentation which was made on the licensee's behalf by its contractor, General Electric (GE) Company, is also enclosed (Enclosure 2). Enclosure 2 is claimed to be proprietary information by GE.
The licensee's representative provided: a summary of the examinations performed at Peach Bottom Units 2 and 3, the UT examination results for the recirculation system outlet safe ends, a discussion of the cracking identified on low carbon stainless steels to date, and an examination of the Peach Bottom Unit 3 safe ends which included material verification, fabrication controls, fabrication history and crack growth evaluation. The licensee's representative stated the infonnation presented represented a status of work completed to date.
The following were sumarized by the licensce's representative:
: 1. L grade stainless steel weldments are highly resistant to intergranular stress corrosion cracking (IGSCC) but cracking can initiate in normally stressed creviced and/or severely cold worked regions.
: 2. Crack growth can occur in non-sensitized stainless steel but the growth rate would be lower than in sensitized stainless steel.
: 3. The extent and mechanism of cracking in the Peach Bottom Unit 3 outlet safe ends is not fully understood. A plug sample will be removed and analjzed to provide further information.
: 4. UT qualification requirements of IE Bulletin 83-02 were utilized and found suitable for flaw detection and sizing.
: 5. The evaluation of the Peach Bottom Unit 3 inlet safe ends renains conservative for 18 months of plant operation.
: 6. Controls have been instituted to limit cold work in piping replacement work.
: 7. Leak before break analyses are still valid.
8510170417 051009 PDR    ADOCK 05000278 Y                  PDR
: 8. Outlet safe ends will be overlayed with a full structural overlay.
: 9. Peach Bottom Unit 3 can be operated safely for 18 months.
The licensee has conmitted to provide the plan for, and the results of, analyses of the plug sample to the staff. It is expected it will take about 1 month to complete the analysis.
Original signed by/
Robert A. Hermann, Project Manager Operating Reactors Branch #2 Division of Licensing
 
==Enclosures:==
 
As stated cc w/ Enclosure 1:
See next page DISTRIBUTION *
*w/ Enclosures 1 and 2 Docket File
* NRC PDR Local PDR ORB #2 Reading ORB #2 Mtg Summ File DVassallo RHermann*
GGears*
OELD ELJordan*
BGrimes ACRS (10)
NRC Participants WSHazelton*
ATaboada*
AW0romerick*
VBenaroya*
SReynolds*
DL 4PB          DL-    #      DL:0RB#2 RHe'7Enn:aj s  G.r            DVassallo 10/O/85 r          16J/5          10/7/85}}

Latest revision as of 00:01, 30 December 2020

Summary of 851001 Meeting W/Util & GE in Bethesda,Md Re Cracking Identified in 316 L Grade Stainless Steel Recirculation Outlet Safe Ends.Proprietary Viewgraphs Encl. Viewgraphs Withheld (Ref 10CFR2.790)
ML20205E710
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 10/09/1985
From: Hermann R
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
Shared Package
ML19273A655 List:
References
NUDOCS 8510170417
Download: ML20205E710 (2)


Text

,

October 9, 1985 Docket No. 50-278 LICENSEE: Philadelphia Electric Company FACILITY: Peach Bottom Atomic Power Station, Unit No. 3

SUBJECT:

MEETING

SUMMARY

- 316 L STAINLESS STEEL RECIRCULATION OUTLET SAFE END CRACKING A meeting was held on October 1,1985 in Bethesda, Maryland between representatives of Philadelphia Electric and the NRC staff to discuss the cracking identified in the Recirculation System outlet safe ends. A list of the attendees is enclosed (Enclosure 1). A copy of the presentation which was made on the licensee's behalf by its contractor, General Electric (GE) Company, is also enclosed (Enclosure 2). Enclosure 2 is claimed to be proprietary information by GE.

The licensee's representative provided: a summary of the examinations performed at Peach Bottom Units 2 and 3, the UT examination results for the recirculation system outlet safe ends, a discussion of the cracking identified on low carbon stainless steels to date, and an examination of the Peach Bottom Unit 3 safe ends which included material verification, fabrication controls, fabrication history and crack growth evaluation. The licensee's representative stated the infonnation presented represented a status of work completed to date.

The following were sumarized by the licensce's representative:

1. L grade stainless steel weldments are highly resistant to intergranular stress corrosion cracking (IGSCC) but cracking can initiate in normally stressed creviced and/or severely cold worked regions.
2. Crack growth can occur in non-sensitized stainless steel but the growth rate would be lower than in sensitized stainless steel.
3. The extent and mechanism of cracking in the Peach Bottom Unit 3 outlet safe ends is not fully understood. A plug sample will be removed and analjzed to provide further information.
4. UT qualification requirements of IE Bulletin 83-02 were utilized and found suitable for flaw detection and sizing.
5. The evaluation of the Peach Bottom Unit 3 inlet safe ends renains conservative for 18 months of plant operation.
6. Controls have been instituted to limit cold work in piping replacement work.
7. Leak before break analyses are still valid.

8510170417 051009 PDR ADOCK 05000278 Y PDR

8. Outlet safe ends will be overlayed with a full structural overlay.
9. Peach Bottom Unit 3 can be operated safely for 18 months.

The licensee has conmitted to provide the plan for, and the results of, analyses of the plug sample to the staff. It is expected it will take about 1 month to complete the analysis.

Original signed by/

Robert A. Hermann, Project Manager Operating Reactors Branch #2 Division of Licensing

Enclosures:

As stated cc w/ Enclosure 1:

See next page DISTRIBUTION *

  • w/ Enclosures 1 and 2 Docket File
  • NRC PDR Local PDR ORB #2 Reading ORB #2 Mtg Summ File DVassallo RHermann*

GGears*

OELD ELJordan*

BGrimes ACRS (10)

NRC Participants WSHazelton*

ATaboada*

AW0romerick*

VBenaroya*

SReynolds*

DL 4PB DL- # DL:0RB#2 RHe'7Enn:aj s G.r DVassallo 10/O/85 r 16J/5 10/7/85