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{{#Wiki_filter:Oconee SLRA: Breakout Questions SLRA Section B2.1.3 Reactor Head Closure Stud Bolting TRP 3 Question SLRA     SLRA           Background / Issue               Discussion Question /
{{#Wiki_filter:Oconee SLRA: Breakout Questions SLRA Section B2.1.3 Reactor Head Closure Stud Bolting TRP 3 Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)
Number  Section    Page          (As applicable/needed)                     Request 1     B2.1.3     B - 35 One of the degradation mechanisms     Discuss the results of the addressed by this AMP is stress       ASME Code Section XI IWB corrosion cracking (SCC) within the   volumetric examinations for reactor head closure studs (Item No. the 60 reactor closure head B6.20) and the threads in the         studs (B6.20) and the 60 reactor vessel flange (Item B6.40). threads-in-flange (B6.40) of The ASME Code Section XI             each Oconee Nuclear Station volumetric examinations for the       (ONS) unit from the last reactor head closure studs (RHCSs)   required examinations.
Discussion Question /
and the threads in the reactor vessel flange are the most effective examinations to detect SCC.
Request 1
2     B2.1.3     B - 40 Operating experience #1 (April       a) Put Dominion Engineering 2011) in the SLRA for the AMP is     Calc R-3181-003 in the discussed in AR 01806638. This       ePortal and discuss the AR discusses studs that had gouges   engineering evaluation, that and missing threads in lower         determined that the damaged threads and scratch across six       studs were acceptable for threads near top. An engineering     continued use.
B2.1.3 B - 35 One of the degradation mechanisms addressed by this AMP is stress corrosion cracking (SCC) within the reactor head closure studs (Item No.
evaluation per guidance in Dominion Engineering Calc R-3181-003 was       b) Discuss potential causes of performed to determine acceptability  the damage in the studs.
B6.20) and the threads in the reactor vessel flange (Item B6.40).
of these studs for continued use.
The ASME Code Section XI volumetric examinations for the reactor head closure studs (RHCSs) and the threads in the reactor vessel flange are the most effective examinations to detect SCC.
3     B2.1.3     B - 36 Details of measured ultimate         a) Clarify that the 60 installed to    strengths of the ONS reactor closure RHCSs and 12 spare RHCSs B - 37  studs from CMTR data are in SLR-     of ONS Unit 1 are made from ONS-AMPR-XI.M3.                       heat 6780366, and the data shown on page 13 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.
Discuss the results of the ASME Code Section XI IWB volumetric examinations for the 60 reactor closure head studs (B6.20) and the 60 threads-in-flange (B6.40) of each Oconee Nuclear Station (ONS) unit from the last required examinations.
b) Similarly, clarify that the 60 installed RHCSs of ONS Unit 2 are made from heat Oconee SLRA: Breakout Questions Question SLRA   SLRA             Background / Issue             Discussion Question /
2 B2.1.3 B - 40 Operating experience #1 (April 2011) in the SLRA for the AMP is discussed in AR 01806638. This AR discusses studs that had gouges and missing threads in lower threads and scratch across six threads near top. An engineering evaluation per guidance in Dominion Engineering Calc R-3181-003 was performed to determine acceptability of these studs for continued use.
Number  Section Page          (As applicable/needed)                     Request 6880366, and the data shown on page 14 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.
a) Put Dominion Engineering Calc R-3181-003 in the ePortal and discuss the engineering evaluation, that determined that the damaged studs were acceptable for continued use.
b) Discuss potential causes of the damage in the studs.
3 B2.1.3 B - 36 to B - 37 Details of measured ultimate strengths of the ONS reactor closure studs from CMTR data are in SLR-ONS-AMPR-XI.M3.
a) Clarify that the 60 installed RHCSs and 12 spare RHCSs of ONS Unit 1 are made from heat 6780366, and the data shown on page 13 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.
b) Similarly, clarify that the 60 installed RHCSs of ONS Unit 2 are made from heat  
 
Oconee SLRA: Breakout Questions Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)
Discussion Question /
Request 6880366, and the data shown on page 14 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.
c) Similarly, clarify that the 60 installed RHCSs and 3 spare RHCSs of ONS Unit 3 are made from heat 159628, and the data shown on page 14 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.
c) Similarly, clarify that the 60 installed RHCSs and 3 spare RHCSs of ONS Unit 3 are made from heat 159628, and the data shown on page 14 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.
4     B2.1.3 B - 42 Operating experience #3 (December   a) Discuss whether a request to    2013) in the SLRA for the AMP is     for alternative through the 10 B - 43  discussed in PIP O-13-15069. This   CFR 50.55a(z) process (10 AR discusses and summarizes          CFR 50.55a(g)(5) back in differences between EPRI            2013) was ever submitted performance demonstration initiative and approved for the EPRI (PDI) used to volumetrically        PDI program and if not, why examine the ONS RHCSs and the        not. Will an alternative volumetric examination methods in    request be submitted for ASME Code, Section XI, Appendix      future required volumetric VIII, Supplement 8.                  examinations? Or, alternatively, clarify whether the EPRI PDI program was ever compliant with Appendix VIII Supp 8 (i.e., provide the historical context of the EPRI PDI program as it relates to the requirements of Appendix VIII; it could be that the program was compliant or it was developed to be compliant with App VIII Supp 8, then the Dec 2013 alert came out that identified a discrepancy).
4 B2.1.3 B - 42 to B - 43 Operating experience #3 (December 2013) in the SLRA for the AMP is discussed in PIP O-13-15069. This AR discusses and summarizes differences between EPRI performance demonstration initiative (PDI) used to volumetrically examine the ONS RHCSs and the volumetric examination methods in ASME Code, Section XI, Appendix VIII, Supplement 8.
Oconee SLRA: Breakout Questions Question SLRA   SLRA         Background / Issue       Discussion Question /
a) Discuss whether a request for alternative through the 10 CFR 50.55a(z) process (10 CFR 50.55a(g)(5) back in 2013) was ever submitted and approved for the EPRI PDI program and if not, why not. Will an alternative request be submitted for future required volumetric examinations? Or, alternatively, clarify whether the EPRI PDI program was ever compliant with Appendix VIII Supp 8 (i.e., provide the historical context of the EPRI PDI program as it relates to the requirements of Appendix VIII; it could be that the program was compliant or it was developed to be compliant with App VIII Supp 8, then the Dec 2013 alert came out that identified a discrepancy).  
Number  Section Page      (As applicable/needed)             Request b) The discussion of operating experience #3 states that the volumetric exams for the ONS RHCSs were reperformed. Were they reperformed with volumetric examination methods that closed the gaps identified in the Dec 2013 alert and therefore compliant with ASME Code, Section XI, Appendix VIII, Supplement 8?
 
c) Have the PDI examination procedures been updated to close the gaps identified in the Dec 2013 alert, and therefore, all future examinations for the ONS RHCSs will be compliant with ASME Code, Section XI, Appendix VIII, Supplement 8?
Oconee SLRA: Breakout Questions Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)
                      }}
Discussion Question /
Request b) The discussion of operating experience #3 states that the volumetric exams for the ONS RHCSs were reperformed. Were they reperformed with volumetric examination methods that closed the gaps identified in the Dec 2013 alert and therefore compliant with ASME Code, Section XI, Appendix VIII, Supplement 8?
c) Have the PDI examination procedures been updated to close the gaps identified in the Dec 2013 alert, and therefore, all future examinations for the ONS RHCSs will be compliant with ASME Code, Section XI, Appendix VIII, Supplement 8?}}

Latest revision as of 18:51, 27 November 2024

Breakout Questions - Trp 3 - RPV Closure Head Studs
ML22024A009
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 01/20/2022
From: Angela Wu
NRC/NRR/DNRL/NLRP
To:
Wu A, 301-415-2995
Shared Package
ML22024A002 List:
References
Download: ML22024A009 (3)
v • d • e


Text

Oconee SLRA: Breakout Questions SLRA Section B2.1.3 Reactor Head Closure Stud Bolting TRP 3 Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)

Discussion Question /

Request 1

B2.1.3 B - 35 One of the degradation mechanisms addressed by this AMP is stress corrosion cracking (SCC) within the reactor head closure studs (Item No.

B6.20) and the threads in the reactor vessel flange (Item B6.40).

The ASME Code Section XI volumetric examinations for the reactor head closure studs (RHCSs) and the threads in the reactor vessel flange are the most effective examinations to detect SCC.

Discuss the results of the ASME Code Section XI IWB volumetric examinations for the 60 reactor closure head studs (B6.20) and the 60 threads-in-flange (B6.40) of each Oconee Nuclear Station (ONS) unit from the last required examinations.

2 B2.1.3 B - 40 Operating experience #1 (April 2011) in the SLRA for the AMP is discussed in AR 01806638. This AR discusses studs that had gouges and missing threads in lower threads and scratch across six threads near top. An engineering evaluation per guidance in Dominion Engineering Calc R-3181-003 was performed to determine acceptability of these studs for continued use.

a) Put Dominion Engineering Calc R-3181-003 in the ePortal and discuss the engineering evaluation, that determined that the damaged studs were acceptable for continued use.

b) Discuss potential causes of the damage in the studs.

3 B2.1.3 B - 36 to B - 37 Details of measured ultimate strengths of the ONS reactor closure studs from CMTR data are in SLR-ONS-AMPR-XI.M3.

a) Clarify that the 60 installed RHCSs and 12 spare RHCSs of ONS Unit 1 are made from heat 6780366, and the data shown on page 13 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.

b) Similarly, clarify that the 60 installed RHCSs of ONS Unit 2 are made from heat

Oconee SLRA: Breakout Questions Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)

Discussion Question /

Request 6880366, and the data shown on page 14 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.

c) Similarly, clarify that the 60 installed RHCSs and 3 spare RHCSs of ONS Unit 3 are made from heat 159628, and the data shown on page 14 of SLR-ONS-AMPR-XI.M3 are the only data on this heat.

4 B2.1.3 B - 42 to B - 43 Operating experience #3 (December 2013) in the SLRA for the AMP is discussed in PIP O-13-15069. This AR discusses and summarizes differences between EPRI performance demonstration initiative (PDI) used to volumetrically examine the ONS RHCSs and the volumetric examination methods in ASME Code,Section XI, Appendix VIII, Supplement 8.

a) Discuss whether a request for alternative through the 10 CFR 50.55a(z) process (10 CFR 50.55a(g)(5) back in 2013) was ever submitted and approved for the EPRI PDI program and if not, why not. Will an alternative request be submitted for future required volumetric examinations? Or, alternatively, clarify whether the EPRI PDI program was ever compliant with Appendix VIII Supp 8 (i.e., provide the historical context of the EPRI PDI program as it relates to the requirements of Appendix VIII; it could be that the program was compliant or it was developed to be compliant with App VIII Supp 8, then the Dec 2013 alert came out that identified a discrepancy).

Oconee SLRA: Breakout Questions Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)

Discussion Question /

Request b) The discussion of operating experience #3 states that the volumetric exams for the ONS RHCSs were reperformed. Were they reperformed with volumetric examination methods that closed the gaps identified in the Dec 2013 alert and therefore compliant with ASME Code,Section XI, Appendix VIII, Supplement 8?

c) Have the PDI examination procedures been updated to close the gaps identified in the Dec 2013 alert, and therefore, all future examinations for the ONS RHCSs will be compliant with ASME Code,Section XI, Appendix VIII, Supplement 8?

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