ML19323D528
| ML19323D528 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/16/1980 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML19323D524 | List: |
| References | |
| NUDOCS 8005210642 | |
| Download: ML19323D528 (23) | |
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i MILLSTONE FEEDWATER SPARGERS I
UPGRADE PROGRAM.
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AGENDA INTRODUCTION (NUSCO)
SPARGER DESIGN FEATURES (GE)
ISSUES IDENTIFIED BY NRC (GE)
IMPLICATIONS OF NRC FINDINGS (GE)
BROAD OBJECTIVES OF UPGRADING (GE)
ADDITIONAL DESIGN TASKS (GE)
CONTROL OF WORK (GE)
HARDWARE INSPECTION AND REWORK (GE)
REMEDIAL ACTION - IF REQUIRED (GE)
SUMMARY
AND CONCLUSIONS (NUSCO)
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WILL DISCUSS,
- SPARGER DESIGN OBJECTIVES
- SPARGER DESIGN CRITERIA
- DESCRIPTION OF SPARGER CONFIGURATION NOMENCLATURE MATERIALS LOAD CARRYING WELDS STRESSES DUE TO PRESSURE DUE TO INSTALLATION O
DUE TO THERMAL CONCLUSIONS 1
kk4/80
DESIGN OBJECTIVES
- CAN BE INSTALLED AND REMOVED WITHOUT CUTTING FEEDWATER PIPING.
IE; REMOVABLE SPARGER.
- PROTECT N0ZZLE AGAINST HIGH FREQUENCY THERMAL CYCLES (N0 LEAK - TRIPLE THERMAL SLEEVE)
- IMMUNE FROM VIBRATION
- ELIMINATE LOW FLOW STRATIFICATION (TOP MOUNTED ELB0WS)
- ELIMINATE N0ZZLE FLOW SEPARATION (CONVERGING N0ZZLES)
- USE MATERIALS AND PROCESSES IMMUNE TO IGSCC
- SHT STAINLESS - 304
- NICRFE kk4/80
DESIGN CRITERIA SINCE:
j SPARGER IS NON-CODE GE GENERIC DESIGN CLASSIFICATION IS NOT ESSENTIAL TO SAFETY DESIGN USING ASME SUBSECTION NG AS A GUIDE-VERIFY THAT SPARGER MEETS NG 1122C REQUIREMENT (I.E., FAILURE WILL NOT AFFECT ANY ESSENTIAL COMPONENT)
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HEADER STRUCTURAL WELDS IDENTIFICATION t
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STRESSES PRESSURE HOOP STRESS = 164 PSI AXIAL TENSILE STRESS AT END PLATE WELD = 62 PSI ELOR N0ZZLE o BENDING = 132 PSI T = 33 PSI THUS:- PRESSURE AND FLOW STRESSES ARE NEGLIGIBLE l
REL
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4/14/80
STRESSES DUE'TO INSTALLATION
- COMPRESSIVE STRESS IN SECONDARY HOUSING
- BENDING STRESS AT
- INNER THERMAL SLEEVE TO TEE WELD NOTE:- THESE ARE DEFLECTION LIMITED SECONDARY STRESSES.
MAGNITUDE LESS THAN ALLOWED BY ASME NG.
REL 4/14/80
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- IMPORTANT TO FATIGUE
- USAGE FACTORS N0ZZLES =.32 T.SLV TO HEADER =.28 HEADER TO END PLATE =.88 NOTE:
ANALYSIS CONSERVATIVE CONCERN - WOUU) HAVE SOME CONCERN IF A WELD DEFECT WERE ON SURFACE.
A LONG PLANAR SURFACE CRACK,1/4 THROUGH WALL WOULD GROW SOME-THING LIKE.020" FOR SYSTEM OPERATION FOR 40 YEAR LIFE.
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CONCLUSION VISUAL AND LIQUID PENETRANT (LP) EXAMINATION ASSURE THAT SPARGER IS STRUCTURALLY ADEQUATE FOR SERVICE.
PRECISE FABRICATION CONTROLS (IE; SECTION IX WELDERS AND FULL SCALE MOCKUPS)
PLUS SURFACE LP EXAMINATION ASSURE STRUCTURAL ADEQUACY OF THE THERMAL SLEEVES.
REL 4/14/80
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ISSUES IDENTIFIED BY THE NRC e
SOME FABRICATION OCCURRED PRIOR TO MARCH 7, 1979 e
FABRICATION PER P.O. 205-AL709 NOT PROVEN GE INSPECTIONS QUESTIONED CHECKLIST NOT PROVIDED IN TIME e
NRC AUDIT OF MARVIN DEFICIENCIES IN IMPLEMENTING QA PROGRAM
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4 IMPLICATIONS OF NRC FINDINGS CONTROL OF WELD PROCEDURES l
IN-PROCESS INSPECTIONS WELD MATERIAL MATERIAL TRACEABILITY QUALIFICATION OF WELDERS f
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BROAD OBJECTIVES OF UPGRADING RECORDS REVIEW TOIDENTIFYARIASOFCONCERN TO IDENTIFY DEVIATIONS VENDOR BINDER MATERIAL P.O 'S VENDOR DETAIL RECORDS ADDITIONAL TESTS OR INSPECTIONS TO RESOLVE DISCREPANCIES IN RECORDS TO VERIFY TECHNICAL ACCEPTABILITY TO ESTABLISH NEW OR ADDITIONAL RECORDS QUALIFY MARVIN TO IMPLEMENT A SAFETY ESSENTIAL PROGRAM REWORK OR REPAIR REPLACE WHAT IS QUESTIONABLE RESTORE TO ACCEPTABLE CONDITION ALL WORK UNDER ANSI N45.2 PROGRAM WILL BE AELE TO STATE FW SPARGERS WERE SUPPLIED; OR REWORKED, UNDER A PROGRAM THAT MEETS THE INTENT, IF NOT THE LETTER, OR 10 CFR 50, APPENDIX B
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a ADDITIONAL DESIGN TASKS e
GE ENGINEERING USES ONE PROCEDURE SYSTEM DESIGN REVIEW DESIGN VERIFICATION DESIGN RECORDS e
SEISMIC CATEGORY I ANALYSIS REQUIRED e
ANSI N45.2 WILL BE APPLIED TO VENDOR FOR REWORK & INSPECTION s
NO DESIGN MODIFICATIONS REQUIRED (UNLESS DICTATED BY SEISMIC ANALYSIS) e o
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MILLSTONE FEEDWATER SPARGER PROGRAM CONTROL 0F WORK i
e ANSI N45.2 WILL BE IMPOSED FOR ALL VENDOR REWORK ACTIVITIES o
GE WILL SPECIFY INSPECTION CRITERIA e
GE ENGINEERING WILL DISPOSITION REPORTED RESULTS e
VENDOR WILL SUBMIT OVERALL PLAN ON TRAVELERS FOR APPROVAL e
GE ENGINEERING WILL IDENTIFY APPROPRIATE SPECIFICATIONS FOR REWORK e
VEND 0R WILL SUBMIT REPAIR PROCEDURE FOR APPROVAL BY GE e
INSPECTIONS, REPLACEMENT, REWORK AND REPAIRS WILL BE DOCUMENTED e
GE QA WILL PROVIDE INCREASED SURVEILLANCE OF THESE ACTIVITIES UNDER NUSCO APPROVED QA PLAN
HARDWARE INSPECTION AND REWORK THERMAL SLEEVES
- X-RAY ALL FIVE WELDS
- EVALUATE PER ENGINEERING REQUIREMENTS EXCEPT NO SURFACE CRACKS ALLOWED,
- PT ALL WELDS AND ADJACENT PARENT MATERIAL ACCESSIBLE SURFACES HEADERS
- X-RAY
- HEADER PIPE TO END CAPS
- HEADER PIPE TO FORGED TEE
- FORGED TEE TO EXTENSION SLEEVE
- EVALUATE PER ENGINEERING REQUIREMENTS EXCEPT NO SURFACE CRACKS ALLOWED
- PT ALL HEADER WELDS INCLUDING N0ZZLE WELDS REL 4/14/80
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s REMEDIAL ACTION - IF REQUIRED
- SURFACE DEFECTS WILL BE GROUND OUT, IF POSSIBLE.
- LOCAL WELD REPAIR, IN ACCORDANCE WITH APPROVED PROCEDURES, IF POSSIBLE.
- CUT APART, RE-WELD PREP, AND REWELD IF AB0VE REPAIRS NOT POSSIBLE.
ROIE:- IF ANY WELD REPAIR IS NECESSARY ON THE HEADERS SOLUTION HEAT TREATMENT IS NECESSARY.
SHT WILL BE FOLLOWED BY PICKLING AND A DIMENSIONAL CHECK.
ROIE:- IF CUT APART, HEADER WILL HAVE LESS ARC LENGTH.
ANALYSIS SHOWS THAT UP TO 1/2 INCH LOSS DOES NOT ADVERSELY AFFECT FLOW DISTRIBUTION, END BRACKETS CAN ALSO ACCOMMODATE LENGTH CHANGE.
1 REL 4/14/80
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REMEDIAL ACTION - CONTINUED MATERIAL MATERIAL THAT DOES NOT HAVE TRACEABILITY WILL BE RETESTED OR SCRAPPED AND REPLACED.
CONCLUSION X-RAY REJECTED THERMAL SLEEVES WILL RE0.UIRE COMPLETE REPLACEMENT SINCE ANY PELDING WILL RESULT IN LOSS OF CONCENTRICITY, ANY SUBSTANTIAL HEADER DEFECT CAN BE REPAIRED -
SUBSTANTIAL DEFECTS NOT EXPECTED.
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REL 4/14/80
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