ML20237E027

Summary of 980625 Meeting W/Entergy Operations,Inc to Discuss Bulletin 96-003 Re Installation of ECCS Suction Strainer in Ninth Refueling Outage for Plant.List of Attendees & Licensee Handout

ML20237E027
Person / Time
Site:	Grand Gulf
Issue date:	08/25/1998
From:	Donohew J NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
IEB-96-003, IEB-96-3, TAC-M96147, NUDOCS 9808280184
Download: ML20237E027 (35)

Text

,

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' @ Eft f34/4 g 1 UNITED STATES

'  :=

j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. ta=== aaat k***** August 25, 1998 l I l

~ LICENSEE: Entergy Operations, Inc.

I FACILITY: Grand Gulf Nuclear Station, Unit 1 (GGNS) l

SUBJECT:

MEETING

SUMMARY

OF JUNE 25,1998, TO DISCUSS BULLETIN 96-03, INSTALLATION OF ECCS SUCTION STRAINER IN NINTH REFUELING OUTAGE FOR GRAND GULF NUCLEAR STATION,

UNIT 1 (TAC NO. M96147) l l l

{,

A meeting was conducted on Thursday, June 25,1998, between the Nuclear Regulatory Commission (NRC) staff and the licensee for the Grand Gulf Nuclear Station, Unit 1 (GGNS).

The meeting was held at the request of the licensee to brief NRC on the licensee's installation of the emergency core cooling system (ECCS) suction strainer in the suppression pool during

. the recently completed ninth refueling outage (RFO 9) for GGNS. The stainer was installed in l

response to the NRC Bulletin 96-03, " Potential Plugging of Emergency Core Cooling Suction )

Strainers by Debris in Boiling Water Reactors," that was issued May 6,1996. The outage l began on April 11,1998, and ended 40 days later on May 21,1998. The notice for the meeting was issued on June 9,1998.

Attachment 1 is the list of attendees, and Attachment 2 is the handout provided by the licensee at the meeting. Each page of Attachment 2 consists of two slide pages from the presentation, except for the 5 figures which are all together and follow slide page 12. The figures in Attachment 2 are Figures 6 through 9, and an unnumbered and untitled figure that is another view of Figure 9. The staff did not provide any handout at the meeting.

The agenda and objectives for the meeting are provided in slide pages 2 and 3 of Attachment 2.

The licensee stated that it was providing the 30-day response, requested by Bulletin 96-03, to ,

report the completion all actions requested by the bulletin, including the installation of the ,

' strainer in the suppression pool during RFO9 for GGNS. The licensee stated that the strainer l was installed in the suppression pool in RFO9. The licensee's 180-day response to the bulletin i was provided in its letter of November 1,1996. j l

A summary of RF00 was presented by the licensee. The summary is in slide pages 4 through 7 of Attachment 2. The objectives of the strainer and the strainer design are provided in slide -

pages 8 through 11. The licensee showed 5 figures showing the strainer. This figures follow l slide page 12. The effects of change on the original design basis for GGNS are provided in slide pages 13 through 25. The design aspects to preclude failure of the strainer are presented on slide pages 26 through 29, and the potential failures, and the consequences of the failures, are shown on slide pages 30 through 32. The design loads for the strainer are presented in the load tables on slide pages 33 through 43. The summary of the licensee's 10 CFR 50.59 evaluation for the strainer design is on slide page 44. g

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E M U2 QRiiEDCCPY 9908290184 990825 m PDR ADOCK 05000416 e PDR i

- - - - . _ - - _ _ _ _ _ - _ _ _ - _ _ _ _ . - _ . . . _ . . . ~ _ - -

r 2 l

A summary of the licensee's inspection of the strainer before installation and of the installation l during the refueling outage is presented in slide pages 45 through 49. l l The licensee completed its presentation and the meeting was closed.

l I

)Ja h.

N. Donohew, Senior hroject Manager Project Directorate IV-1 j Division of Reactor Projects !!!/IV Office of Nuc' ear Reactor Regulation Docket No. 50-416 Attachments: 1. List of Meeting Attendees

2. Licensee's Handout cc w/atts: See next page

i, g l

2 A summary of the licensee's inspection of the strainer before installation and of the installation during the refueling outage is presented in slide pages 45 through 49.

The licensee completed its presentation and the meeting was closed.

ORIGINAL SIGNED BY:

Jack N. Donohew, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation Docket No. 50-416 Attachments: 1. List of Meeting Attendees

2. Licensee's Handout ec w/atts: See next page DISTRIBUTION HARD COEY 6 '

PUBLIC PD4-1 r/f OGC ACRS TGwynn, RIV E-MAIL SCollins/FMiraglia (SJC1/FJM)

BBoger (BAB2)

EAdensam (EGA1)

CHawes (CMH2)

TMartin (SLM3)

JDonohew (JND)

! JHannon (JNH)

JKudrick (JAK1)  ;

l AD'Angelo (TXD)

Document Name: GG96147.MTS l

OFC PM/PQf6 LA/PD4-1 P @ 4-1 i NAME JDorhvw CHawes Nb DATE 2 /k /98 9 /14 /98 [/Y/98 7

COPY YES/NO YES/NO YES/NO OFFICIAL RECORD COPY l  ;

l j

1 Entergy Operations, Inc. Grand Gulf Nuclear Station j

)

i cc:

1 Executive Vice President General Manager, GGNS

& Chief Operating Officer Entergy Operations, Inc.

Entergy Operations, Inc. P. O. Box 756 P. O. Box 31995 Port Gibson, MS 39150 Jackson, MS 39286-1995 Attomey General Wise, Carter, Child & Caraway Department of Justice P. O. Box 651 State of Louisiana l Jackson, MS 39205 P. O. Box 94005 Baton Rouge, LA 70804-9005 I Winston & Strawn 1400 L Street, N.W. - 12th Floor State Health Officer Washington, DC 20005-3502 State Board of Health P. O. Box 1700 Director Jackson, MS 39205 q

, Division of Solid Waste Management

! Mississippi Department of Natural Office of the Govemor Resources State of Mississippi P. O. Box 10385 Jackson, MS 39201 Jackson, MS 39209-Attomey General President, Asst. Attorney General Claibome County Board of Supervisors State of Mississippi  ;

P. O. Box 339 P. O. Box 22947 Port Gibson, MS 39150 Jackson, MS 39225 l~ . Regional Adminteator, Regd IV Vice President, Operations Support l U.S. Nuclear Regulatory Commission Entergy Operations, Inc.

611 Ryan Plaza Drive, Suite 1000 P.O. Box 31995

- Arlington, TX 76011 Jackson, MS 39286-1995 Senior Resident inspector Director, Nuclear Safety U. S. Nuclear Regulatory Commission and Regulatory Affairs P. O. Box 399 Entergy Operations, Inc.

l-Port Gibson, MS 39150 P.O. Box 756 l Port Gibson, MS 39150 Mr. Joseph J. Hagan Vice President, Operations GGNS

Entergy Operations, Inc.

I P. O. Box 756 Port Gibson, MS 39150

4 LIST OF ATTENDEES AT MEETING OF JUNE 25.1998 faBAND GULF BULLETIN 96-03 ECCS SUCTION STRAINER NAME AFFILIATION J.Donohew NRC/NRR/PDIV-1 J. Kudrick NRC/NRR/SCSB A. D'Angelo NRC/NRR/PIPB W. Hughey EOl- Grand Gulf M. Locke EOl - Grand Gulf R. Ingram EOl - Grand Gulf D. Smith EOl- Grand Gulf D. Barfield EOl- Grand Gulf T. Hilston CEI- Perry Nuclear Power Plant G. Rhoads CEI- Perry Nuclear Power Plant J. Grabner CEI- Perry Nuclear Power Plant R. Bryan ENERCON A. Patel ENERCON J. Kaczmarek lilinois Povier 4

where: CEI = Cleveland Electric illuminating Company  ;

EOl = Entergy Operations, Inc.

NRC = Nuclear Regulatory Commission  ;

NRR = Office of Nuclear Reactor Regulation PIPB = Inspection Program Branch j PDIV-1 = Project Directorate IV-1 ,

SCSB = Containment Systems and Severe Accident Branch j i

ATTACHMENT 1

( I

9

r.

"To be the best operating BWR in this country

• GRAND GULF NUCLEAR STATION ECCS SUCTION STRAINER JUNE 25,1998

)

1 l l

m

)

"To be the best operating BWR in this country" INTRODUCTION

+ MEETING OBJECTIVES

+ RFO9

SUMMARY

l

+ ECCS SUCTION STRAINER

> STRAINER DESIGN OBJECTIVES

> DESIGN OVERVIEW i

> DESIGN EVALUATION I l + ECCS SUCTION STRAINER INSTALLATION

+

SUMMARY

1 2

l ATTACHMENT 2 1

'To be the best oper. ting BWR in this country

• MEETING OBJECTIVES

+ PROVIDE OVERVIEW OF RFO9

• EMPHASIS ON ECCS SUCTION STRAINER INSTALLATION

> DISCUSSION TO FOCUS ON DIFFERENCES BETWEEN GGNS AND PNPP

+ MEETING WILL SATISFY NRC BULLETIN 96-03 30-DAY RESPONSE

> FINAL DOCKETED RESPONSE FOLLOWING COMPLETION OF OPEN ITEMS 3

4

+

RFO9 OUTAGE GOALS W

-ro b tne b.si on.r. tina BWR in this country

• TARGET / ACTUAL

+ DURATION <32 Days / 40 Days (Shortest to Date)

+ COST <$21 Mil / $21.8 Mil

+ PUST OUTAGE RUN >60 Days /1 Day

+ NUCLEAR SAFETY <2 LERs /1 LER

+ SAFETY <12 / 7 OSHA Recordable

+ DOSE <245 REM / 238 REM (Lowest to Date)

+ NO LOSS OF SHUTDOWN COOLING / NONE (Three Consecutive Outages with NO Events) 4 i

I

l M

• To be the best operating BWR in this country

• RFO9 CHALLENGES

+ DOSE

+ PROPER USE OF DOSITEC

+ SECURITY DOORS 5

"To be the best operating BWR in this country

• RFO9 COMPARISONS

+ TOTAL OUTAGE DOSE

> RFO7 - 296.628 REM

> RFO8 - 271.420 REM

> RFO9 - 237.486 REM

+ TURNSTILE EVENTS

• ONLY ONE OCCURRENCE

+ DOSITEC ISSUES

>NO HIGH RAD ENTRIES WITHOUT DOSITECS 6

l t

e ,

s "To be the best oper ting BWR in this cnuntry*

RFO9 COMPARISONS

+ INSECURE DOOR EVENTS

>RFO7-45

>RFO8-22

>RFO9-11

+ QUARTERLY LOGGABLE EVENTS

>2nd Otr. '95 (RFO7)- 86

>4th Qtr. '96 (RFO8)- 78

>2nd Qtr. '98 (RFO9) - 29 (through 6/21/98) 7 r=

STRAINER DESIGN N

To b the b..t over ting BWR in this country

• OBJECTIVES

+ FULLY RESPOND TO BULLETIN 96-03

+ FOLLOW GUIDANCE OF RG 1.82, REV. 2

+ DEVELOP STRAINER DESIGN TO SATISFY BULLETIN 99-03

• EVALUATED OPTIONS

> SELECTED BEST CONCEPTUAL STRAINER DESIGN OPTION

>LARGE PASSIVE STRAINER DESIGN

• f

• DEVELOPED CONCEPTUAL DESIGN

• CONDUCTED TESTING TO PROVE CONCEPT 8

s "To be the best operating BWR in this country" DESIGN OVERVIEW

+ APPROACH VELOCITY MAXIMUM OF 0.020 FPS ,

DESIRED

+ MAINTAIN ECCS FUNCTIONAL GROUP SEPARATION AND INDEPENDENCE

+ INSULATION AND OTHER DEBRIS

>PlPE BREAK ZONE OF INFLUENCE BASED ON BWROG URG METHOD

• 100%. TRANSPORT FROM DRYWELL ASSUMED FOR FIBER AND MISCELLANEOUS DEBRIS

)

1 9

,e.

'To be the best operating )

DESIGN OVERVIEW (continued)BWRin this country' j i

+ SEISMIC AND HYDRODYNAMIC LOADS

+ ECCS PUMP NPSH EVALUATED AT 185* F

+ NO CREDIT TAKEN FOR CONTAINMENT PRESSURIZATION I

10 I .

4 .

i

• To be the best operating PASSIVE STRAINER DESIGN BWRinthis country *

+ LARGE TOROIDAL STRAINER WITH INTERNAL DIVIDERS FOR ECCS FUNCTIONAL GROUP SEPARATION

• LOW PROFILE STRAINER TO MINIMlZE EFFECTS OF HYDRODYNAMIC LOADS

+ LARGE SURFACE AREA WITH APPROACH VELOCITY ON THE ORDER OF 0,020 FPS'

+ MODULAR CONSTRUCTION TO FACILITATE '

INSTALLATION 11

'To be the best operating l

BWR in this country

• ADD 3-D PICTURES 1 l

I 12

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. FIGURE 6. Grand Gulf Nuclear Station Conceptual Strainer Design l 1

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4 FIGURE 8. Grand Gulf Nuclear Station Suction Strainer (3-section) 270' IJ -

HPCS PUMP SUCT10N RHR PUMP SUCTION

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RHR PUMP "C " , d SUCTION

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FIGURE 9. Typical Strainer Design 1

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l l . _u l EFFECTS OF CHANGE M

To b. in. d..i on.r ting ON ORIGINAL DESIGN BASIS 8*"'"th """v"

+ ECCS/RCIC NPSH REQUIREMENTS AND NPSH AVAILABLE

>RG 1.1 REQUIREMENTS MET

>RG 1.82, REV. 2 INVOKES RG 1.1 l

13 EFFECTS OF CHANGE N

ro b. in. d..t op.r. ting ON ORIGINAL DESIGN BASIS BWRinthis country"

+ ECCS FUNCTIONAL GROUP SEPARATION

> REDUNDANT INTERNAL DIVIDER PLATES AT EACH DIVISION INTERFACE TO PRECLUDE SINGLE FAILURE AFFECTING MORE THAN ONE DIVISION

+ RCIC SEPARATED FROM HPCS

> REDUNDANT DIVIDER PLATES IN OUTER CHANNEL AT DIV. 2/3 INTERFACE

• lNNER/ OUTER CHANNEL SEPARATION i

14 1

i

f i

i EFFECTS OF CHANGE N

no d. tn. e..t op.r.tino ON ORlulNAL DESIGN BASIS BWRinthis country'

+ EFFECT ON POOL MIXING AND POOL STRATIFICATION EFFECTS CONSIDERED

• EXISTING STRAINERS HAVE SINGLE POINT l SUCTION

>NEW STRAINER DESIGNED FOR 360*

I SUCTION SOURCE

-NO SHORT CIRCUlTING AND ADEQUATE MIXING

• 1/d-S ALE TESTING SHOWED GOOD MIXING OFPOOL 15

=

EFFECTS OF CHANGE no d. in. e..t op.r. tina ON ORIGINAL DESIGN BASIS BWRinthiscountry"

+ EFFECT ON POOL MIXING AND POOL STRATIFICATION EFFECTS CONSIDERED (cont.)

> SUCTION POINT LOWER IN POOL WITH NEW STRAINER

> CONSIDERED IN THE 50.59 AND FOUND TO BE ACCEPTABLE

>lNITIAL HEAT REMOVAL RATE LESS BUT STILL BOUNDED BY ORIGINAL ANALYSIS I

16 l

EFFECTS OF CHANGE To b. in e.1 op.r. tin, ON ORIGINAL DESIGN BASIS BWRinthis country *

+ STRAINER SUSCEPTIBILITY TO AIR INGESTION OR ENTRAPMENT

> STRAINER ENCROACHES INTO SRV EXCLUSION ZONE (GE SPEC)

> SATISFACTORY CFD AND BUBBLE ANALYSIS PERFORMED 17 e

EFFECTS OF CHANGE To n. tn. e..i on.r tina ON ORIGINAL DESIGN BASIS BWRinthis country *

+ DESIGN NOT CONDUCIVE TO AIR INGESTION OR ENTRAPMENT

>lNTERNAL RIBS MINIMlZE AIR TRANSPORT TO SUCTION TEE

{

>LOWAPPROACH VELOCITY NOT {

SUPPORTIVE OF AIR FLOW TO STRAINER j

> AIR WOULD BE RELEASED QUICKLY DUE TO l LOW APPROACH VELOCITY AND LOW FLOW VELOCITY l

18

k'w EFFECTS OF CHANGE no d. in. e..t op.r tin.

ON ORIGINAL DESIGN BASIS BWRinthis country"

+ HPCS AND RCIC SUCTION FROM OUTER CHANNELS, FURTHER FROM SRV ZONE

+ LOW PRESSURE ECCS OPERATION AT RUNOUT FLOW NOT COINCIDENT WITH SRV ACTUATION OR LOCA VENT CLEARING 19 i

EFFECTS OF CHANGE no 8. in. e.. op.r. tin.

ON ORIGINAL DESIGN BASIS BWRinthiscountry"

+ EFFECT ON CONTAINMENT LOADS AND LOADS DEFINITIONS

> STRAINER LOCATED AT POOL BOTTOM

> LOCATED BELOWVOLUME AFFECTED BY LOCA BUBBLENENT CLEARING / POOL SWELL l

-NOT A FLOW OBSTRUCTION TO BOTTOM ROW OF VENTS

> CONDENSATION OSCILLATION AND CHUGGING OCCUR AT TOP ROW OF VENTS 20 l

l

EFFECTS OF CHANGE -ro b.in. o.. op.r. tin.

O ON ORIGINAL DESIGN BASIS 8*"ia"* unt'r

+ EFFECT ON CONTAINMENT LOADS AND LOADS DEFINITIONS (cont.)

• LOCATED AT BOTTOM OF SRV QUENCHER EXCLUSION ZONE

• CONFIRMATORY (SIMPLIFIED) CFD ANALYSIS DONE 21

+

EFFECTS OF CHANGE To d. tn. e.1 op.r.tino ON ORIGINAL DESIGN BASIS BWRinthis country *

+ ECCS FUNCTIONAL GROUPS

> MECHANICAL SEPARATION ACHIEVED FOR THREE FUNCTIONAL GROUPS

>LPCS AND ONE LPCI(DMSION 1)

• TWO LPCI (DMSION 11)

>HPCS (DMSION lil)

>LONG-TERM, IN ADDITION TO THE INITIATING EVENT, THE ECCS IS ABLE TO SUSTAIN A SINGLE FAILURE (PASSIVE OR ACTIVE), AND STILL HAVE AT LEAST ONE LOW-PRESSURE l ECCS PUMP OPERATING WITH A HEAT EXCHANGER.

i

)

i v.

EFFECTS OF CHANGE ro d. tn. .t op.r. tina ON ORIGINAL DESIGN BASIS BWRMthi. country *

+ ECCS FUNCTIONAL GROUPS (CONTINUED)

> SEPARATION BARRIERS (PERFORATED PLATES) CONSTRUCTED BETWEEN STRAINER SECTIONS FOR ECCS .

FUNCTIONAL GROUPS TO ENSURE FAILURE OF ONE STRAINER SECTION WILL NOT AFFECT THE REMAINING FUNCTIONAL GROUP (S)

>RCIC AND HPCS SEPARATED - DO NOT COMMUNICATE WITH SAME STRAINER GROUP 23 EFFECTS OF CHANGE To d. tn. d..i on . tina ON ORIGINAL DESIGN BASIS BWRinthis country"

+ ECCS PUMP NPSH .

> FOLLOW RG 1.1

>USE MAXIMUM EXPECTED TEMPERATURE OF ECCS PUMPED FLUID

• NO CREDIT TAKEN FOR CONTAINMENT PRESSURIZATION

> PREVIOUS CALCULATIONS CONSERVATIVELY USED 212' F FOR ECCS NPSH (GE DESIGN SPEC) 24 4

EFFECTS OF CHANGE N

1. b. in. .t o,.,.iin.

ON ORIGINAL- DESIGN BASIS **"'ath'* uav'

+ ECCS PUMP NPSH (Cont.)

• CONTAINMENT DESIGN TEMPERATURE IS 185* F. MAXIMUM CALCULATED SUPPRESSION POOLTEMPERATURE POST-LOCA IS LESS THAN 185* F. THEREFORE, 185* F USED FOR NPSH CALCULATIONS (DEBRIS LADEN)

>212' F USED FOR NPSH CALCULATIONS (WITHOUT DEBRIS)

>NPSH 3ADEQUATE FOR ALL ANALYZED SCENARIOS 25 DESIGN ASPECTS TO PRECLUDE k'

To e. in o.. op.,. tin, BWR in this country" FAILURE OF STRAINER

+ STRAINER DESIGNED TO ASME CODE REQUIREMENTS (BUT NOT AN ASME COMPONENT)

> MATERIALS ASME ll

• WELDING ASME IX

>NDE ASME V

+ MATERIALS SELECTED AND PROCESSES SPECIFIED TO PRECLUDE CORROSION

>304/316 STAINLESS STEEL 1

26 i

e DESIGN ASPECTS TO PRECLUDE Q

To d.in. e..iop.r.tino BWR in this country

• FAILURE OF STRAINER

+ DEBRIS QUANTITIES USED FOR SIZING ARE CONSERVATIVE

~50% FIBER INSULATION IN DRYWELL

> SLUDGE AND CORROSION PRODUCTS GREATER THAN BWROG URG

>OTHER DEBRIS PER BWROG URG

+ VERY LOW APPROACH VELOCITY - <0.020 FPS 27 s

DESIGN ASPECTS TO PRECLUDE To d.in. e. 1op r.tino BWR in this country' FAILURE OF STRAINER

+ STRAINER DESIGNED FOR POSTULATED LOADINGS

> SEISMIC SSE/OBE

> HYDRODYNAMIC (SRV AND LOCA)

• COMBINATIONS OF LOADS (GESSAR ll) 28 l

9 DESIGN ASPECTS TO PRECLUDE Q

To de th e.. op.r. tin, BWR in this country" FAILURE OF STRAINER

+ MISSILE PROTECTION (RG 1.82, REV. 2)

• NO CREDIBLE MISSILE IN SUPPRESSION POOL

• EQUIPMENT ABOVE POOL SEISMICALLY SUPPORTED

>LARGE EQUIPMENT IN POOL SWELL AREA QUALIFIED / PROTECTED 29 POTENTIAL FAILURES AND g'

1o d tn. e.. op.,. tin, FAILURE CONSEQUENCES BWRinthis country *

+ FUNCTIONAL FAILURE OF STRAINER SECTION CONSIDERED

• ECCS SEPARATION PROVIDED TO PRECLUDE LOSS OF MORE THAN ONE DIVISION / GROUP

> LOSS OF SINGLE ECCS FUNCTIONAL GROUP ANALYZED IN GGNS SAFETY ANALYSIS REPORT l

l 30 u___ _ _ - _ _ _ _ _ _ - _ . _ _ _ _

6 POTENTIAL FAILURES AND k'

ro e, in. . .,,,,1in, FAILURE CONSEQUENCES BWR in this country *

+ COMPLETE CLOGGING AND LOSS OF NPSH

> STRAINER SIZED FOR 50% DRYWELL FIBER DEBRIS LOAD AND CONSERVATIVE AMOUNTS OF OTHER DEBRIS

> TESTS CONFIRM STRAINER CAPABILITY WITH MAXIMUM DEBRIS POSTULATED

>NO CREDITIS TAKEN FOR STRAINER CLEANING BY OPERATION IN POOL COOLING M6De l

31 POTENTIAL FAILURES AND 1o 3. in, e.1 oy ,,1in, FAILURE CONSEQUENCES BWR in this country *

+ COMPLETE CLOGGING AND LOSS OF NPSH (Cont.)

> TESTS CONFIRM SATISFACTORY PERFORMANCE WITH ELEVATED pH AND NO APPARENT LONG TERM HEAD LOSS EFFECTS WITH MAXIMUM DEBRIS LOADING

> DEBRIS SETTLING IS CREDITED, BASED ON EMPIRICAL RESULTS FROM 1/4-SCALE .

l TESTING l

1 l

32 1

l

( _ .________________________a

o **

O

• To be the best operating BWR in this country

• LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY Seismic, LOCA and GESSAR 11 GESSAR11 SRV inertia Loads Seismic Slosh GESSAR11 GESSAR11 Loading SonicWave Loadhg GESSAR ll GESSAR11 (Negligible - not (Negligible - not calculated) calculated)

Compressive Wave GESSAR ll GESSAR 11 Loading (Negligible - not (Negligible - not calogted) calculated) l I

I ta glGg i

• To be the best operating BWR in thinountry*

LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY SRV Quencher Structures located ECCS straineris Water Jet Loading outside a sphere located outside the circumscribed around sphere ofinfluence. j the quencher arms i

, do not experience l

! significant loads and I this loading is ignored.

34 1

I

,, so

+

.~

"To be the best operating BWR in this country

• LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY ,

4 SRV Quencher Submerged structure GESSAR 11 Method Bubble Pressure loads based on ofImages, Potential Loading Supplement 1 of Flow Methodology NUREG-0487. This conservative method produces loads that bound the loads based on GESSAR 11 i 35

g. - .;

"To be the best operating BWR in this country

• LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY LOCA Vent Water Based on GE Topical ECCS Suction Clearing Load Report NEDE-21472 Straineris located outside the zone of influence specified in GESSAR 11. Loads outside the zone of influence are bounded by the LOCA Bubble ressure Loads.

36 ,

l l

I L _ _ ___ _____ _

p ..

i l l

l I

1

(

"To be the best operating swa in this country-LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER i

SOURCE METHODOLOGY LOADS METHODOLOGY LOCA Bubble Pool Boundary Pool Boundary Pressure Loading Pressure x Projected Pressure x Projected Area of Structure. Area of Structure.

Pool Swell Drag GESSAR 11(Not GESSAR 11(Not Forces Applicable) Applicable) 37 E.

"To be the best operating BWR in this country

• LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY ,

Pool Fallback Drag GESSAR!! GESSAR11 Forces Condensation Pool Boundary GESSAR 11 Method l Oscillation Loads Pressure x Projected ofImages Potential Area of Structure. Flow Methodology ,

38 j

i l

l I

-t "To be the best operating BWR in this country

• LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY LOCA Chugging Pool Boundary Senetec Acoustic Loads Pressure x Projected Wave Methodology Area of Structure.

Deadweight 1g Acceleration 1g Acceleration 39 s v.

"To be the best operating BWR in this country

• LOAD TABLE 4

DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY Buoyancy Not Explictitly Upward Load Equal Addressed. to the Weight of Displaced Water.

Thermal Expansion 40' F to 212' F (per 60' F to 212' F Specification 9645- considered in design M-187.0) of strainer. No l temperature gradient ,

across strainer j sMure Gop to 40 bottom) considered

m "To be the best operating BWR in this country

• LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY Differential Building Not Applicable to (Negligible) Bellows Movement existing strainer isolates penetration which is attached to a connection from single structure. strainer. Movements determined for eveluation of bellows.

Differential Pressure 1 ft H2O (per P x A- based on specification 9645-M- maximum expected 187.0) dP.

l

?

'To be the best operating l BWR in this country" LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER l SOURCE METHODOLOGY LOADS METHODOLOGY l Lift due to Vent Not Explicitly (Negligible - not Clearing Water Jet Addressed calculated) ,

Confirmed by CFD l analysis of MK lil Suppression Poolto

, be no significant uplift I on stralner, RHR HX Relief Valve Bounded by SRV Bounded by SRV Discharge Load quenchergads quencherloads i

1 l

I

"To be the best operating BWR in this country" LOAD TABLE DESIGN LOAD GGNS UFSAR ECCS STRAINER SOURCE METHODOLOGY LOADS METHODOLOGY RCIC Turbine Bounded by SRV Bounded by SRV Exhaust Discharge quencherloads quencherloads SPMU Dump Flow Not Explicitly Bounded by pool Load Addressed swellfallback loads

. . l 43 '

?

10CFR50.59 To b.in. o.. op.r ting BWR in this country" EVALUATION

+ GOAL OF CHANGE TO ENSURE ECCS MEET 10CFR50.46

{

+ THE CHANGE DOES NOT CAUSE A GREATER RELIANCE TO BE PLACED ON ANY SPECIFIC SYSTEM, STRUCTURE, OR COMPONENT TO <

PERFORM A SAFETY FUNCTION

+ THE STRAINER IMPROVES THE AVAILABILITY OF THE ECCS AND RCIC SYSTEMS

+ THE STRAINER DOES NOT CAUSE THE ECCS AND RCIC SYSTEMS TO BE OPERATED OUTSIDE OF THEIR DESIGN BASIS LIMITS I 44 l

I 1

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STRAINER INSTALLATION To b. in. b..t op.r. tina BWR in Wuountry" j ISSUES

+ CLEANLINESS  !

• WELD SLAG / WELD SPATTER ,

• MACHINE SHAVINGS

+ WELD CONFIGURATION ,

• NOT PER DESIGN DRAWINGS I

• MISSING / UNDERSIZE WELDS I q

+ NON-CONFORMANCES DOCUMENTED IN CORRECTIVE ACTION PROGRAM 45 I

i M

• To be the best operating i BWR in this country

• STRAINER RECOVERY l

+ RATIONALE j

• NO MATERIAL QUALITY ISSUES I

• BREAKDOWN IN VENDOR QA LOCALIZED TO WELD INSPECTION AREA

> STRAINERS RECOVERABLE ,

>BY GG CLEANING j >BY GG QAINSPECTION l *BY GG WELDER REWORK

>BY ENGINEERING REANALYSIS 1

46 l

3'n

• To be the best operating BWR in this country" STRAINER RECOVERY

+ RECOVERY PLAN SET

> RECOVERY ORGANIZATION ESTABLISHED

> SCHEDULE ESTABLISHED

> OUTAGE RESOURCES REDIRECTED TO SUPPORT INSTALLATION IN RFO9

+ REVIEWED AND APPROVED BY PSRC

+ MANAGEMENT OVERSIGHT ESTABLISHED

+ CHECKLIST DEVELOPED TO TRACK 47

-u "To be the '>est operating STRAINER INSTALLATION 8*" 'a 2" ' """v"

+ START DELAYED BY RECOVERY

+ WORKED TO ORIGINAL INSTALLATION PLAN WITH EXCEPTION TO SYSTEM CONNECTIONS

+ RETESTED WITH ORIGINAL RETEST PLANS

+ NO SURPRISES l 48 I

.. , e l

i

.?a fdST

'To be the best operating BWR in this country" STRAINER INSTALLATION

+ STRAINER RING COMPLETED IN 9 DAYS

+ SYSTEM CONNECTIONS COMPLETED IN 7 DAYS .

+ DOSE

• DIVING - 1.324 REM q

> SUPPORT - 3.365 REM i

e e 49 i

[

t I