ML103000402
| ML103000402 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 09/21/2010 |
| From: | Public Service Enterprise Group |
| To: | Office of Information Services |
| References | |
| FOIA/PA-2010-0334, 20462034 | |
| Download: ML103000402 (8) | |
Text
Notification Overview Run Date: 09/21/2010 Run Time: 08:11:36 Nucear LLC Page: 1 of 2 ul LNotification 20462034 Notification 20462034 Notification type N1 Description Basis AFW Discharge Line Design Pressure Nuc. Maint. Request Reporter CRA WFORD2 754 10:49:34 Notification date 05/05/2010 Start date 06/17/2010 End date 07/01/2010 Start time 11:27:49 End time 11:27:49 Priority 5 C-Routine Sig. Level 5 Main WorkCtr. S-EDMO0 Funct. location SCAF AUXILIARY FEEDWA TER (SALEM)Equipment Assembly Order 70110267 PM planner grp 099 Nuclear Default**************Long Text Object Identification**************
Notification 000020462034 Long text**** ***** ***** *05/05/2010 10:49:34 NUCLEARNOT (NUCLEARNOT)
Notification submitted by: Michael Crawford 856-339-2754 ENTNBU\NUMEC:
CONDITION DESCRIPTION/LOCATION (THE INAPPROPRIATE ACTION AND ITS NEGATIVE EFFECT/INCLUDE A -DETAILED LOCATION DESCRIPTION):##
corrosion resulting in piping having legs than minimum wall thickness based on the design pressure for the piping. The Pipe Specification S-C-MPOO-MGS-0001, SPS54E lists the design pressure as 1950 psi and the maximum normal operating pressure as 1195 psi. An evaluation determined that the maximum credible operating pressure for this piping was approximately 1300 psi. This raised the question as to the design basis for the 1950 psi design pressure and whether it is higher than necessary.
A search has not found a definitive basis for the 1950 psi number. Several possibilities exist, although the best estimate is the turbine driven AFW pump operating at shutoff head at 4000 rpm, but this event has not been fully investigated to determine if it is credible.
Notification is to provide the design basis for the 1950 psi design pressure for the AFW common discharge piping.ACTIVITIES, PROCESSES, PROCEDURES INVOLVED: Substantiation of the Design Basis for the AFW piping design pressure.WHY DID CONDITION HAPPEN?The need to substantiate AFW common discharge pipe minimumr wall thickness resulted in challenging the design pressure as higher than necessary because basis for 1950 psi could not be definitively established.
CONSEQUENCES:
Corroded pipe in Unit 1 was replaced.
Establishment of the design basis essential for configuration control.SAtihi6i-nfhyei *i-is n-t o-cons eq cjge-i i'gifr-alto nfd it 6 ar49 50 sirem-ai ns the design pressure.REQUIREMENTS IMPACTED: None.ADVERSE PHYSICAL CONDITIONS:
None.WHO WAS NOTIFIED: Design Engineering Director, Manager and Mechanical Branch Manager.KNOWLEDGEABLE INDIVIDUALS:
Pat Ayers, Michael Crawford, Kevin King, Mohammad Ahmed -- Design Engineering REPEAT OR SIMILAR CONDITION:
0 PSE G Nuclear LLC Notification Overview Run Date: 09/21/2010 Run Time: 08:11:36 Page: 2 of 2 Notification 20462034 Not a repeat condition.
Similar condition exists at Unit 2 with same design pressure for AFW common discharge pipe having design pressure of 1950 psi.IMMEDIATE ACTIONS AND RECOMMENDED ACTIONS: No immediate actions necessary.
Recommended action as follows: Assign to Design Engineering:
establish the design basis for 1950 psi design pressure.4 STEVEN B MILLER NFF Not Applicable Not a Functional Failure TSCO TSCO End of report Work Order Shop Papers 09/21/2010 O PSEG Nuclear LLC 70110267 Order: Order Type Status Notification Unit Functional Location 70110267 NUCR 20462034 Basis AFW Discharge Line Design Pressure SC SCAF AUXILIARY FEEDWATER (SALEM) .Equipment Assembly Location Room System Priority Main Work Center AF 5 S-EDMOO C-Routine HENNESSY, PHIL (Mech/Structural Mgr)Status Basic Dates: Start: 09/08/2010 Finish: 09/08/2010 Overdue: Sfty RItd/QA Reqd Sfty Class Mrule Code SEISMIC EQ Permission to Begin Work NFF-Date: Time: 00:00:00 Description of Work Basis AFW Discharge Line Design Pressure**************Long Text Object Identification**************
Notification 000020462034 Long text 05/05/2010 10:49:34 NUCLEARNOT (NUCLEARNOT)
Notification submitted by: Michael Crawford 856-339-2754 ENTNBU\NUMEC:
CONDITION DESCRIPTION/LOCATION (THE INAPPROPRIATE ACTION AND ITS NEGATIVE EFFECT/INCLUDE A DETAILED LOCATION DESCRIPTION):##
-I --SAFETY: The Only C. H.0.1. C. E.Commitment Help Oversight Involvement Pr!,i 1 Nf 9 Work Order Shop Papers 0 PSEG 09/21/2010 Nuclear LLC During the Unit 1 1R20 Outage the buried AFW discharge piping was found to have heavy external corrosion resulting in piping having less than minimum wall thickness based on the design pressure for the piping. The Pipe Specification S-C-MPOO-MGS-0001, SPS54E lists the design pressure as 1950 psi and the maximum normal operating pressure as 1195 psi. An evaluation determined that the maximum credible operating pressure for this piping was approximately 1300 psi. This raised the question as to the design basis for the 1950 psi design pressure and whether it is higher than necessary.
A search has not found a definitive basis for the 1950 psi number. Several possibilities exist, although the best estimate is the turbine driven AFW pump operating at shutoff head at 4000 rpm, but this event has not been fully investigated to determine if it is credible.
Notification is to provide the design basis for the 1950 psi design pressure for the AFW common discharge piping.ACTIVITIES, PROCESSES, PROCEDURES INVOLVED: Substantiation of the Design Basis for the AFW piping design pressure.WHY DID CONDITION HAPPEN?The need to substantiate AFW common discharge pipe minimum wall thickness resulted in challenging the design pressure as higher than necessary because basis for 1950 psi could not be definitively established.
CONSEQUENCES:
Corroded pipe in Unit 1 was replaced.
Establishment of the design basis essential for configuration control. At this point their is not consequence as AFW system restored to original condition and 1950 psi remains the design pressure.REQUIREMENTS IMPACTED: None.ADVERSE PHYSICAL CONDITIONS:
None.Design Engineering Director, Manager and Mechanical Branch Manager.KNOWLEDGEABLE INDIVIDUALS:
Pat Ayers, Michael Crawford, Kevin King, Mohammad Ahmed -- Design Engineering REPEAT OR SIMILAR CONDITION:
Not a repeat condition.
Similar condition exists at Unit 2 with same design pressure for AFW common discharge pipe having design pressure of 1950 psi.IMMEDIATE ACTIONS AND RECOMMENDED ACTIONS: No immediate actions necessary.
Recommended action as follows: Assign to Design Engineering:
establish the design basis for 1950 psi design pressure.SAFETY: The Only C.H.O.I.C.E.
Commitment Help Oversight Involvement
--I -
Operation List Sur 09/21/2010 nmary O 'SEG ANuclear LLC 70110267 OP Sub Work Description Start Date Work No Durtn Op. Center i_ _ _ _ _ _ _ _ I _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _0001 0010 0020 S-EP03 S-EDMi 1 S-EP02 Downgraded op 10 SL4 to SL5 7/29/10 per determine basis 1950 design afw press ENTER TREND CODING 08/02/20 10 09/08/20110 09/08/20110 0.0 1.0 1.0 0 0.0 1.0 1.0 SAF:ETY: The Only C.H.O.I.C"E.
Commitment Help Oversight Involvement Communication Empowerment
-T Page 1 of 1 Operation Key Info 09/21/2010 70110267 O PSEG NuVclear LLC Order: 70110267 Operation:
0001 per Work center: S-EP03 Status: Number of People: 0 Scheduled Dates: Start: 08/02/2010.
Planned Hours: 0.0 Actual Dates: Start: 08/02/2010 Actual Hours: 0.000 Completion Confirmation Number: Basis AFW Discharge Line Design Pressure Downgraded op 10 SL4 to SL5 7/29/10 NNUC Finish: 08/02/2010 Finish:08/02/2010 Personnel Number: 8423188..C fiDw griaded Tex t o :- 7/29/10..
..... ..... .....Downgraded op 10 SL4 to SL5 7/29/10 per Downgraded op 10 SL4 to SL5 7/29/10. per MRC.Signature:
Description of Work: MICHELE L LANDIS Downgraded op 10 SL4 to SL5 7/29/10 per MRC.**************Long Text Object Identification**************
Order 000070110267 Operation 0001 Long text SAFETY: The Only C.H.O.I.C.E.
Commitment Help Oversight Involvement Communication Empowerment M 4- .1 -L 1)
Operation Key Info 09/21/2010 0 PSEG Nuclear LLC Order: 70110267 Operation:
0010 Work center: S-EDM11 Status: Number of People: 1 Scheduled Dates: Start: 09/08 Planned Hours: 1.0 Actual Dates: Start: 07/12/Actual Hours: Completion Confirmation Number: Basis AFW Discharge Line Design Pressure determine basis 1950 design afw press NNUC Finish: 09/08/2010 Finish:07/12/2010 Personnel Number: 8252755/2010 2010 0.000 Confirmation Text: Extension~Extensio n" This task is to determine the basis for the AFW design pressure.
There is no impact on safety, reliability or system function.
Extension to 10/27/10 is lAW LS-AA-125, and has the approval of the Design Engineering Mechanical/Structural Branch Manager.Signature:
Description of Work: KEVIN C KING SAFETY: The Only C.H.O.I.C.E.
Commitment Help Oversight Involvement Communication Empowerment Operation Key Info 09/21/2010 O PSEG Nuclear LLC Order: 70110267 Operation:
0020 Work center: S-EP02 Status: Number of People: 1 Scheduled Dates: Start: 09/0 Planned Hours: 1.0 Actual Dates: Start: Actual Hours: Completion Confirmation Number Confirmation Text: Basis AFW Discharge Line Design Pressure ENTER TREND CODING NNUC Finish: 09/08/2010 8/2010 Finish: 0.000 Personnel Number: 8252756 Signature:
Description of Work: SAFETY: The Only C.H.O.I.C.E.
Commitment Help Oversight Involvement Communication Empowerment