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#REDIRECT [[RS-17-119, Byron, Units 1 and 2 - Full Action Request Report AR 1284054, Legacy Issues with Main Steam Tunnel Pressurization Calculation, Redacted]]
{{Adams
| number = ML17255A831
| issue date = 10/31/2011
| title = Full Action Request Report AR 1284054, Legacy Issues with Main Steam Tunnel Pressurization Calculation, Redacted
| author name =
| author affiliation = Exelon Generation Co, LLC
| addressee name =
| addressee affiliation = NRC/NRR
| docket = 05000454, 05000455
| license number = NPF-037, NPF-066
| contact person =
| case reference number = RS-17-119
| document report number = AR 1284054
| package number = ML17255A838
| document type = Report, Technical
| page count = 6
}}
 
=Text=
{{#Wiki_filter:Go Back Print l New Search l Home AR Number: 01284054 Linked ARs Aff Fac:
Byron AR Type:
CR Status:
COMPLETE Aff Unit:
00 Owed To:
A8852CAP Due Date:
04/30/2012 Aff System:
Event Date:
10/31/2011 CR Level/Class:
4/D Disc Date:
10/31/2011 How Discovered:
H02 Orig Date:
10/31/2011 Action Request Details
 
==Subject:==
LEGACY ISSUES WITH MAIN STEAM TUNNEL PRESSURIZATION CALCULAT
 
==
Description:==
Originator:
Supv Contacted:
Condition
 
== Description:==
The issue documented in this IR was previously identified in IR 789344.
Calculation 3C8-0282-001 was found to contain errors and the original IR was generated. Actions to revise the calculation were tied to IR 653093 for AF tunnel cover design deficiencies. The purpose of this IR is to create stand alone actions to improve the calculation. A brief history of the issue is included below; During preparation of engineering changes to correct deficiencies with the AF tunnel covers, it was determined that the main steam tunnel pressurization calculation prepared by Sargent & Lundy (calculation 3C8-0282-001) contained errors. At the time, operability was addressed as part of Operability Evaluation EC 366685 which has since been closed after new AF tunnel covers were installed.
The main issue affecting the calculation results was the configuration of blowout panels in the main steam safety valve rooms. This issue was resolved through modifications (EC 375941 and 375942). Enhancements to the calculation were added to actions tied to IR 653093. That IR dealt with deficiencies in the design of the AF tunnel covers that have since been corrected. Actions to address the calculation weaknesses should have been stand alone.
Basis for operability Calculation 3C8-0282-001 determines the main steam tunnel pressurization under HELB conditions. The main issue with the calculation was that it assumed panels installed over dampers in the safety valve rooms would blow out under the HELB pressure. At the time of the original IR 789344, the panels were found to be welded in place. Since that time, the panels have been replaced with blowout panels. The other issues identified in IR 789344 dealt with strengthening assumptions in the calculation. It is expected that these assumptions are valid, but need better documentation to meet todays standards for technical rigor.
Immediate actions taken:
Research of open corrective actions to try to clarify what is needed to close them.
Page 1 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet
 
Recommended Actions:
: 1. Initiate a request for proposal to update calculation 3C8-0282-001.
Once the proposal is obtained create a new action to obtain the necessary funding.
: 2. Calculation 3C8-0282-001 takes input from main steam mass and energy release provided in EC 373119. It is also recommended to investigate issuance of a new mass and energy release calculation since an EC Evaluation does not replace a design basis calculation.
What activities, processes, or procedures were involved?
Review of aging CAs to determine actions left to complete them. This one didn't make sense since all of the actions from the original IR had been completed but a CA was still open.
Why did the condition happen?
Actions from several IRs were combined into one CA. The tie between the original issue and the corrective action was lost.
What are the consequences?
A aging CA could have been closed sooner.
Were any procedural requirements impacted?
None Were there any adverse physical conditions?
None List of knowledgeable individuals:
Repeat or similar condition?
None that I am aware of.
Operable Basis:
Reportable Basis:
Does not meet any Reportability criteria per the Exelon Reportability Manual.
SOC Reviewed by:
11/02/2011 09:37:20 CDT SOC Comments:
Follow up to shift for operability/reportability.
110111 SOC 110111 Send to Design Electrical Engineering for actions.
11/01/11 SOC 110211 Reviewed by:
11/02/2011 01:46:09 CDT Reviewer Comments:
"The purpose of this IR is to create stand alone actions to improve the calculation." This is an Admin action. There is no new issue in this IR.
Functionality not affected. Shift review for Operability and Reportability complete.
Department review performed by:
11/04/2011 08:01:32 CDT Evaluation Comments:
Actions Completed/Created:
The following assignment was created; Page 2 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet
 
Initiate requests for proposals to update calculation 3C8-0282-001 and to provide a revised mass and energy release calculation. Once the proposals are obtained create a new action to obtain the necessary funding.
Manager review performed by:
11/07/2011 17:09:28 CST Manager Comments:
I agree with the actions.
Page 3 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet
 
Assign #: 01 AR #: 01284054 Aff Fac:
Byron Assign Type:
TRKG Status:
COMPLETE Priority:
Assigned To:
Due Date:
11/11/2011 Schedule Ref:
Prim Grp:
ACAPALL Orig Due Date:
Unit Condition:
Sec Grp:
Assignment Details Subject/Description: LEGACY ISSUES WITH MAIN STEAM TUNNEL PRESSURIZATION CALCULAT Assignment Completion In Progress Notes:
Completion Notes:
Page 4 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet
 
Assign #: 02 AR #: 01284054 Aff Fac:
Byron Assign Type:
ACIT Status:
COMPLETE Priority:
Assigned To:
Due Date:
01/06/2012 Schedule Ref:
Prim Grp:
A8852NESDM Orig Due Date:
12/02/2011 Unit Condition:
Sec Grp:
Assignment Details Subject/Description: Initiate requests for proposals to update calculation 3C8 -0282-001 and to provide a revised mass and energy release calculation. Once the proposals are obtaine d create a new action to obtain the necessary fundi ng.
Assignment Completion In Progress Notes:
01.06.12 The scope of this ACIT has changed, with the concurrence of Jack Feimster, Design Engineering Manager. The revised scope it to initiate a requisition to revise the main steam tunnel mass and energy calculation.
The original scope requested initiation of a request for proposal. The goal of a RFP is to then be able to initiate a requisition. Thus, the change in scope is satisfactory, inconsequential, and expeditious.
Requisition 01284479 has been initiated. This task is complete and may be closed.
This calc revision is not yet funded. However, it is being lumped into a mass engineering pot for 2012 resolution of legacy issues. A new ATI will be cut to A8852NESDM to track approval of funding. This task will be an ACIT and will be set far enough in the future to avoid future extensions.
It will be task 03 of this AR.
Completion Notes:
Page 5 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet
 
Assign #: 03 AR #: 01284054 Aff Fac:
Byron Assign Type:
ACIT Status:
COMPLETE Priority:
Assigned To:
Due Date:
04/30/2012 Schedule Ref:
Prim Grp:
A8852NESDM Orig Due Date:
04/30/2012 Unit Condition:
Sec Grp:
Assignment Details Subject/Description: obtain funding for requisition 1284479, calculation 3C8-0282 Assignment Completion In Progress Notes:
Contract Requisition 1284479 was cancelled. The main steam tunnel pressurization issue is being addressed as part of the Design Issues Plan.
Reference contract 470441-292 Completion Notes:
see in prog notes Page 6 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet}}

Latest revision as of 11:03, 8 January 2025

Full Action Request Report AR 1284054, Legacy Issues with Main Steam Tunnel Pressurization Calculation, Redacted
ML17255A831
Person / Time
Site: Byron  Constellation icon.png
Issue date: 10/31/2011
From:
Exelon Generation Co
To:
Office of Nuclear Reactor Regulation
Shared Package
ML17255A838 List:
References
RS-17-119 AR 1284054
Download: ML17255A831 (6)
v • d • e


Text

Go Back Print l New Search l Home AR Number: 01284054 Linked ARs Aff Fac:

Byron AR Type:

CR Status:

COMPLETE Aff Unit:

00 Owed To:

A8852CAP Due Date:

04/30/2012 Aff System:

Event Date:

10/31/2011 CR Level/Class:

4/D Disc Date:

10/31/2011 How Discovered:

H02 Orig Date:

10/31/2011 Action Request Details

Subject:

LEGACY ISSUES WITH MAIN STEAM TUNNEL PRESSURIZATION CALCULAT

==

Description:==

Originator:

Supv Contacted:

Condition

Description:

The issue documented in this IR was previously identified in IR 789344.

Calculation 3C8-0282-001 was found to contain errors and the original IR was generated. Actions to revise the calculation were tied to IR 653093 for AF tunnel cover design deficiencies. The purpose of this IR is to create stand alone actions to improve the calculation. A brief history of the issue is included below; During preparation of engineering changes to correct deficiencies with the AF tunnel covers, it was determined that the main steam tunnel pressurization calculation prepared by Sargent & Lundy (calculation 3C8-0282-001) contained errors. At the time, operability was addressed as part of Operability Evaluation EC 366685 which has since been closed after new AF tunnel covers were installed.

The main issue affecting the calculation results was the configuration of blowout panels in the main steam safety valve rooms. This issue was resolved through modifications (EC 375941 and 375942). Enhancements to the calculation were added to actions tied to IR 653093. That IR dealt with deficiencies in the design of the AF tunnel covers that have since been corrected. Actions to address the calculation weaknesses should have been stand alone.

Basis for operability Calculation 3C8-0282-001 determines the main steam tunnel pressurization under HELB conditions. The main issue with the calculation was that it assumed panels installed over dampers in the safety valve rooms would blow out under the HELB pressure. At the time of the original IR 789344, the panels were found to be welded in place. Since that time, the panels have been replaced with blowout panels. The other issues identified in IR 789344 dealt with strengthening assumptions in the calculation. It is expected that these assumptions are valid, but need better documentation to meet todays standards for technical rigor.

Immediate actions taken:

Research of open corrective actions to try to clarify what is needed to close them.

Page 1 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet

Recommended Actions:

1. Initiate a request for proposal to update calculation 3C8-0282-001.

Once the proposal is obtained create a new action to obtain the necessary funding.

2. Calculation 3C8-0282-001 takes input from main steam mass and energy release provided in EC 373119. It is also recommended to investigate issuance of a new mass and energy release calculation since an EC Evaluation does not replace a design basis calculation.

What activities, processes, or procedures were involved?

Review of aging CAs to determine actions left to complete them. This one didn't make sense since all of the actions from the original IR had been completed but a CA was still open.

Why did the condition happen?

Actions from several IRs were combined into one CA. The tie between the original issue and the corrective action was lost.

What are the consequences?

A aging CA could have been closed sooner.

Were any procedural requirements impacted?

None Were there any adverse physical conditions?

None List of knowledgeable individuals:

Repeat or similar condition?

None that I am aware of.

Operable Basis:

Reportable Basis:

Does not meet any Reportability criteria per the Exelon Reportability Manual.

SOC Reviewed by:

11/02/2011 09:37:20 CDT SOC Comments:

Follow up to shift for operability/reportability.

110111 SOC 110111 Send to Design Electrical Engineering for actions.

11/01/11 SOC 110211 Reviewed by:

11/02/2011 01:46:09 CDT Reviewer Comments:

"The purpose of this IR is to create stand alone actions to improve the calculation." This is an Admin action. There is no new issue in this IR.

Functionality not affected. Shift review for Operability and Reportability complete.

Department review performed by:

11/04/2011 08:01:32 CDT Evaluation Comments:

Actions Completed/Created:

The following assignment was created; Page 2 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet

Initiate requests for proposals to update calculation 3C8-0282-001 and to provide a revised mass and energy release calculation. Once the proposals are obtained create a new action to obtain the necessary funding.

Manager review performed by:

11/07/2011 17:09:28 CST Manager Comments:

I agree with the actions.

Page 3 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet

Assign #: 01 AR #: 01284054 Aff Fac:

Byron Assign Type:

TRKG Status:

COMPLETE Priority:

Assigned To:

Due Date:

11/11/2011 Schedule Ref:

Prim Grp:

ACAPALL Orig Due Date:

Unit Condition:

Sec Grp:

Assignment Details Subject/Description: LEGACY ISSUES WITH MAIN STEAM TUNNEL PRESSURIZATION CALCULAT Assignment Completion In Progress Notes:

Completion Notes:

Page 4 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet

Assign #: 02 AR #: 01284054 Aff Fac:

Byron Assign Type:

ACIT Status:

COMPLETE Priority:

Assigned To:

Due Date:

01/06/2012 Schedule Ref:

Prim Grp:

A8852NESDM Orig Due Date:

12/02/2011 Unit Condition:

Sec Grp:

Assignment Details Subject/Description: Initiate requests for proposals to update calculation 3C8 -0282-001 and to provide a revised mass and energy release calculation. Once the proposals are obtaine d create a new action to obtain the necessary fundi ng.

Assignment Completion In Progress Notes:

01.06.12 The scope of this ACIT has changed, with the concurrence of Jack Feimster, Design Engineering Manager. The revised scope it to initiate a requisition to revise the main steam tunnel mass and energy calculation.

The original scope requested initiation of a request for proposal. The goal of a RFP is to then be able to initiate a requisition. Thus, the change in scope is satisfactory, inconsequential, and expeditious.

Requisition 01284479 has been initiated. This task is complete and may be closed.

This calc revision is not yet funded. However, it is being lumped into a mass engineering pot for 2012 resolution of legacy issues. A new ATI will be cut to A8852NESDM to track approval of funding. This task will be an ACIT and will be set far enough in the future to avoid future extensions.

It will be task 03 of this AR.

Completion Notes:

Page 5 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet

Assign #: 03 AR #: 01284054 Aff Fac:

Byron Assign Type:

ACIT Status:

COMPLETE Priority:

Assigned To:

Due Date:

04/30/2012 Schedule Ref:

Prim Grp:

A8852NESDM Orig Due Date:

04/30/2012 Unit Condition:

Sec Grp:

Assignment Details Subject/Description: obtain funding for requisition 1284479, calculation 3C8-0282 Assignment Completion In Progress Notes:

Contract Requisition 1284479 was cancelled. The main steam tunnel pressurization issue is being addressed as part of the Design Issues Plan.

Reference contract 470441-292 Completion Notes:

see in prog notes Page 6 of 6 Full Action Request Report 8/31/2017 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet

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