ML19309F932

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Summary of 800401 Meeting W/Jcp&L Representatives Re Proposed Repair of Cracked Core Spray Sparger
ML19309F932
Person / Time
Site: Oyster Creek
Issue date: 04/17/1980
From: Nowicki S
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 8005020023
Download: ML19309F932 (28)
v • d • e


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UNITED STATES E

NUCLEAR REGULATORY COMMISSION o

WAbHINGTON, D. C. 20655 p

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April 17, 1980 Docket No. 50-219 LICENSEE: Jersey Central Power & Light Company FACILITY: Oyster Creek Nuclear Generating Station

SUBJECT:

SUMMARY

OF APRIL 1,1980 MEETING TO DISCUSS PROPOSED REPAIR OF THE CRACKED CORE SPRAY SPARGER AT THE OYSTER CREEK NUCLEAR GENERATING STATION On April 1,1980, representatives of Jersey Central Power & Light Company (JCP&L) met with the NRC staff to describe details of the indication of cracks found in the spargers of the Core Spray System and the proposed repair.

This meeting was held at the request of JCP&L to view video tapes of the sparger inspection and discuss repair and operation of the sparger until it could be replaced at the next or following refueling outage. is a copy of the information presented by JCP&L at the meeting. is a list of the attendees.

Significant items of discussion at the meeting are sumarized below:

1.

JCP&L has defined 5 indications on System I and 24 indications on System II as cracks. The criteria for defining an indication as a crack consisted of a visual identification or a combination of UT and visual indications or a combination of indications using different UT exam methods.

2.

No UT indications were found on System I.

Most cracks were approximately 0.001 inch wide. The one crack found during the 1978 inspection is approximately 0.030 inches wide.

3.

The air bubble test indicated that none of the cracks were through-wall cracks (except the 1978 crack).

4.

JCP&L proposes to install 2 clamps on System I and 7 new clamps on System II as an interim repair until the core spargers are replaced.

JCP&L proposes to develop and install an improved system or sparger in the next cycle or two.

s

' Only a short section of the video tape was displayed during the meetir.g.

JCP&L determined that the resolation of the NRC video monitor was too poor to properly display cracks recorded on the tape.

JCP&L stated that the highest resolution was obtained from the on-line monitor used during the inspection and the JCP&L off-line monitor also had high enough resolution to witness the cracks.

The staff is in the process of reviewing'JCP&L's proposed repair to the sparger.

cr 5

e Stanley J.

wicki, Project Manager Operating Reactors Branch #2 Division of Operating Reactors

Enclosures:

As stated cc w/ enclosures:

See next page 0

y

. cc w/ enclosures:

G. F. Trowbridge, Esquire Gene Fisher Shaw, Pittman, Potts and Tr owbridge Bureau Chief 1800 M Street, N. W.

Bureau of Radiation Protection Washington, D. C.

20036 380 Scotts Road Trenton, New Jersey 08628 GPU Service Corporation ATTN:

Mr. E. G. Wallace Mark L. First Licensing Manager Deputy Attorney General 260 Cherry Hill Road State of New Jersey Parsippany, New Jersey 07054 Department of Law and Public Safety Environmental Protection Section Anthony Z. Roisman 36 West State Street Natural Resources Defense Council Trenton, New Jersey 08625 917 15th Street, N. W.

Washington, D. C.

20006 Joseph T. Carroll, Jr.

Plant Superintendent Oyster Creek Nuclear Generating Steven P. Russo, Esquire Station 248 Uashington Street P. O. Box 388 P. O. Box 1060 Forked River, New Jersey 08731 Toms River, New Jersey 08753 Jo eph W. Ferraro, Jr., Esquire Director, Technical Assessment Deputy Attorney General Division State of New Jersey

  • 0ffice of Radiation Programs Departcent of Law and Public Safety (AW 459) 1100 Raymond Boulevard U. S. Envi ronmental Protection Newark, New Jersey 07012

. Agency Crystal Mall #2 Ocean County Library Arlington, Virginia 20460

)

Brick Township Branch 401 Chembers Bridge R'oad H. S. Environmental Protection Brick Town, New Jersey 08723 Agency Region II Office Mayor ATTN:

EIS C0ORDINATOR Lacey Township 26 Federal Plaza P. O. Box 475 New' York, New York 10007 Forked River, New Jersey 08731 Mr. I. R. Finfrock, Jr.

Coctr.i ssioner Vice President - Generation Department of Public Utilities Jersey Central Power & Light Company State of New Jersey Madison Avenue at Punch Bowl Road 101 Connerce Street Morristown, New Jersey 07960 Newark, New Jersey 07102

-v,

ENCLOSURE 1 NUCLEAR REGULATORY COMMISSION - JERSEY CENTRAL POWER & LIGHT COMPANY MEETING AGENDA - APRIL 1, 1980 OYSTER CREEK NUCLEAR GENERATING STATION CORE SPRAY SYSTEM SPARGERS 1.

INTRODUCTION T. M. CRIMMINS II.

DESCRIPTION OF CRACKS T. M. CRIMMINS III.

EVALUATION OF CRACKS AND W. R. SCHMIDT STRUCTURAL INTEGRITY IV.

HYDRAULIC AND FLOW DISTRIBUTION J. S. CHARDOS ADEQUACY V.

CORRECTIVE ACTIONS W. R. SCHMIDT VI.

SUMMARY

AND CONCLUSIONS T. M. CRIMMINS 4%

t i

II.

DESCRIPTION'0F CRACKS A.

INSPECTION TECHNIQUES AND TESTS 1.

VISUAL TV

- METHOD AND LIMITATIONS

- QUALITY

- RESULTS 2.

AIR TEST

- METHOD AND LIMITATIONS

- QUALITY

- RESULTS 3.

UT INSPECTION

- METHOD AND LIMITATIONS

- QUALITY

- RESULTS B.

EVALUATION OF INDICATIONS 1.

CRITERIA 2.

RESutTS C.

KNOWN CRACK CHARACTERISTICS 1.

VISUAL COMPARISON MEASUREMENT 2.

AIR TEST M0CK-UP D.

SIGNIFICANT UNDETECTED CRACKS UNLIKELY 1.

COMPREHENSIVE AND SENSITIVE INSPECTIONS 2.

AIR TEST

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III.-

EVALUATION OF CRACKS A.

HOW INITIATED - SCC B.

HOW PROPAGATED - INITIAL RESIDUAL LOADS C.

EFFECT OF CRACKS (EXISTING, UNDETECTED, OR NEW) ON SYSTEM INTEGRITY

- INSTALLATION AND FABRICATION LOADS ARE SELF-RELIEVING AND LIMIT CRACK GRWOTH

- THERE ARE NO SIGNIFICANT OPERATING LOADS IN SERVICE (THERMAL, VIBRATION, DEAD WEIGHT, SEISMIC)

- THE ONLY LOADS WHICH ARE SIGNIFICANT ARE THOSE

)

ASSOCIATED WITH AN INJECTION

  • HYDRAULIC AP
  • THERMAL MISMATCH

- INJECTION LOADS ARE LOW AND DO NOT IMPAIR SPARGER INTEGRITY, EVEN IN PRESENCE OF CRACKS

- CRACK OPENING DUE TO INJECTION TRANSIENT IS BOUNDED-

- EXPERIENCE INDICATES RATE OF CRACK INITIATION AND GROWTH SHOULD NOT INCREASE SIGNIFICANTLY IN THE FUTURE

=

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IV.

HYDRAULIC AND" FLOW ~ DISTRIBUTION ?.LE00ACY A.

CRACK SIZE ASSUMPTIONS 1.

NUMBER AND LOCATION OF CRACKS 2.

CRACK WIDTH

- VISUAL COMPARISONS

- MOCK-UP AIR TESTS 3.

CRACK OPENING DURING INITIATION B.

ANALYSIS METHOD AND CRITERIA 1.

CRACKS MODELED AS NEW OR LARGE N0ZZLES 2.

INDIVIDUAL N0ZZLE FLOWS 3.

CRITERI A FOR HYDRAULICS - 1968 TEST

- ADEQUATE DISTRIBUTION FOR SYSTEM FLOWS BETWEEN 3100 AND 4500 GPM C.

RESULTS 1.

SYSTEM I AND 11 CAPABLE OF DELIVERING FLOW TO 0FFSET CRACK FLOW D.

SIGNIFICANT CRACK FLOW INTERFERENCE WITH SPRAY PATTERN IS PREVENTED 1.

CLAMP INSTALLATION DIVERTS CRACK FLOW BACK TOWARD THE SHROUD 2.

NONCLAMPED CRACKS ARE TOO SMALL TO OFFSET DISTRIBUTION m

V.

CORRECTIVE ACTIONS A.

INSTALLATION OF REPAIR CLAMP ASSEMBLIES B.

CRITERIA FOR SELECTION OF AREAS TO BE CLAMPED:

- AREAS HAVING POTENTIAL CRACKS ON FRONT AND BACK SIDES OF SPARGER

- INLET JUNCTION BOX AREAS C.

FUNCTIONS OF CLAMP ASSEMBLIES

- STRENGTHEN SPARGER IN AREA 0F CRACKS

- PREVdNT LO']SE PARTS

- DIVERT CRACK SPRAY FLOW D.

DESIGN BASIS FOR CLAMP

- NORMAL LOADS (THERMAL, FLOW, VIBRATION, WEIGHT)

- SEISMIC LOADS

- INJECTION LOADS

- POSITIVE ENGAGEMENT WITH PIPE e

- SOLUTION ANNEALED MATERIAL l

E.

EXPERIENCE WITH 1978 CLAMP VERIFIES ACCEPTABILITY

VI.

SUMMARY

AND CONCLUSIONS 1.

NUMEROUS INDICATIONS HAVE BEEN DETECTED TO DATE ON BOTH SYST SPARGERS.

TWENTY-NINE OF THESE INDICATIONS HAVE BEEN CLASSI-FIEDASCRACKS.(TWENTY-FOURONSYSTEMIIhNDFIVEONSYSTEM I.)

2.

IT IS VERY UNLIKELY THAT ANY SIGNIFICAllT INDICATIONS HAVE BEEN MISSED.

3.

EXTENSIVE ADDITIONAL CRACKING IS NOT LIKELY IN THE NEXT CYCLE OF OPERATION.

1 4.

EXISTING CRACKS AND NEW CRACKS, SHOULD THERE BE ANY, ARE NOT LIKELY TO PROPAGATE OR OPEN VERY MUCH DURING NORMAL PLANT OPERAT!rg, 5.

THE OtlLY SIGNIFICANT OPERATIONAL LOADS THAT CAN BE POSTULATED ARE THOSE ASSOCIATED WITH INITIATION OF THE CORE S, PRAY SYSTEM.

EVENUNDERTHESELdADS,SIGNIFICAllTCRACKINITIATI,0NORGROWT IS NOT EXPECTED.

G.

FOR REASONABLE ASSUMPTIONS ON CRACK SIZE AND PROPAGATION, AN-ALYSES DEMONSTRATE THAT THE DESIGN NOMINAL FLC'il A!1D DISTRIBU, TION CHARACTERISTICS OF THE CORE SPRAY SYSTEM Call BE MAINTA llITHIN ACCEPTABLE LIMITS.

MARGIN REMAINS FOR NEW CRACKS.

~;- n.._::2x: --

VI.

SUMMAPY AND CONCLUSIONS (CONTINUED) 7.

THE CLAMP ASSEMBLIES AT ALL SIGNIFICANT CRACK LOCATIONS PROVIDE ADDITIONAL STRUCTURAL CAPABILITY TO THE SPARGER AND MINIMIZE THE CHANCES FOR GE0 METRY CHANGES SIGNIFICANT TO THE HYDRAULIC PERFORMANCE.

8.

CRACK FLOW IS UNLIKELY TO SIGNIFICANTLY AFFECT THE SPRAY DIS-TRIBUTION.

1 9.

ALTdOUGHTHEREPAIRDOESNOTRESTORETHECORESPRAYSPARGERSTO TI.'EIR ORIGINAL DESIGN CONDITION, THERE IS REASONABLE ASSURANCE THAT IN THE UNLIKELY EVENT THAT THE CORE SPRAY SYSTEM WOULD BE CALLED UPON TO FUNCTION DURING OPERATION, THE SYSTEM, INCLUDING THESPARGERS,WOULDPERFORMITSJNTENDEDFUNCTIONINACCORDANCE WITH THE ORIGINAL DESIGN CRITERIA.~

10.

THE NEXT CYCLE OR TWO WILL BE 'JSED TO DEVELOP AND INSTALL AN IMPROVED SYSTEM OR SPARGER TO PROVIDE EVEN GREATER LONG-TERM ASSURANCE OF OPERABILITY, l

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Page 1 of 3

SUMMARY

OF VISUAL & ULTRASONIC EXAMINATION RESULTS TABLE 1 CORE SPRAY SYSTEM II TED BY DETECTED BY DETECTED BY CRITERIA fl

.N h

N~

IIELICAL (VISUAL 'C' RACKS)

~

AZIMUTH LONGITUDINAL L

5 *.

NO NO NO.

YES YES

~

13/14*

NO NO NO YES NO 22/23' NO NO YES YES NO 102/103*

NO NO YES 30 NO 112*

NO NO.

NO NO YES 146' NO NO NO NO YES 148' NO NO YES NO YES 152*-

YES YES NO NO YES 155' NO NO NO NO YES 165*

YES NO YES NO YES 183&l85*

YES NO YES NO YES 189*

NO NO YES NO NO-192&l95*

NO NO YES YES YES 220 NO NO YES NO NO

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261/269 NO NO YES YES YES 305/307*

NO.

NO YES YES NO 322' NO NO

. YES NO NO 328*

NO NO NO NO YES

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TABLE 2 CRITERIA FOR CLASSIFYING INDICATIONS AS CRACKS 1.

POSITIVE VISUAL

  • PLUS ANY POSSIBLE VISUAL
  • RECORD IF A) WITHIN 120* ON FRONT OR AT TOP OR BOTTOM B) UT WAS ACTIVE AT THAT POINT 2.

ANY HELICAL UT INDICATION RECORD IF A) COINCIDENTAL WITH ANY VISUAL AT TOP OR BOTT,0M B) COINCIDENTAL WITH 120* UT OR ANY VISUAL WITHIN 120* FRONT FACE 3.

A 120 UT (FRONT UT) OR LONGITUDINAL UT INDICATION PLUS ANY VISUAL INDICATION i

{

  • POSITIVE VISUAL VISUAL EXAMINER'S STATEMENT THAT "THIS IS A CRACK" OR " POSITIVE CRACK" OR " IDENTIFIED CRACK" POSSIBLE VISUAL

" FAINT", "POSSIBLE", "LINE", "MAYBE" CRACKS OR INDICATIONS l

I

1 CRITERIA #1:

FOSITIVE VISUAL PLUS ANY POSSIBLE VISUAL Visual Front Indication Azimuth Visual _

Location UT Active UT Results i

System II 5'

yes top front & helical yes, helical see Criteria 2 112' no top helical none 146*

yes top helical none 148' yes top front yes, front see Criteria 3 152*

yes top front none 155' yes bottom front none 165*

yes bottom front & helical yes, front see Criteria 3 183*

no top front & helical yes, front see Criteria 3 185*

no top front & helical yes, front see Criteria 3 192*

no bottom front & helical yes, front &

helical see Criteria 2

&3 195*

yes top front & helical yes, front &

helical see Criteria 2

&3 265/269 yes top front & helical helical see Criteria 2

&3 328 yes top front none 331 yes top helical none

CRITERIA #1:

POSITIVE VISUAL PLUS ANY POSSIBLE VISUAL Visual Front Indication Azimuth Visual Location UT Active UT Results Ststem I 148' yes top front none 151' yes top front none 156' yes top

dront none l

251-255' yes none front & helical none 328' yes top front none 0

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CRITERIA #2:

ANY HEL1 AL INDICATIONS System II Front UT Indication i

Helical UT Coincident Visual Indication or Front Visual Indication Azimuth (Top or Bottom)

Indication 000*(360*)

Visual on fror.t face 1

at center 5*

5*

(Visual at top) 13/14*

Nothing Visual 22/23*

Nothing Visual UT 120* indication 192/195 192/195* (Visual near top &

192/195 (UT 120*

toward center [192]; Visual indication and front bottom [195])

visual [192]; top visual [195])

264/269" 264/269* (Visual near top &

264/269* (UT 120 toward center) indication and front visual) 305/307* (Visual near top) 305/307* (UT 120 305/307 indication) 335/338e 335/338* (Visual near top) 335/338* (UT 120

  • indication)

System I none a

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CRITERIA #3:

FRONT UT INDICATION COINCIDENT W/ANY VISUAL INDICATION System II Azimuth Visual Indication Location 102/103*

bottom & center I

148*

top & center 165*

top & center 183*

top' 185*

top 189*

center 192*

bottom & center 195*

top 220/225*

bottom & center 264/269*

top & center 305/307*

top 322*

center 335/338*-

top Longitudinal Coincident W/Any Visual Indication 152*

top & center (See Criteria #1) 165*

top & center (See Above) 183/185 top (See Above)

System I none

e ENCLOSURE 2 LIST OF ATTENDEES APRIL 1, 1980 Jersey Central Power & Light Company T. Crimmins J. Chardos T. Tipton J. Knubel S. Chan General Electric R. Legate N. Hughes J. Oates G. Pelson MPR Associates W. Schmidt Boston Edison J. Fulton NRC R. Klecker i

W. Hazelton V. Benaroya R. Hermann H. Walker J. Fair J. Tsao F. Witt H. Conrad G. Georgiev B. Elliot J. Grant F. Litton M. Mendonca B. Mills S. Nowicki i

s a

w

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