ML20128Q367

Summary of 850619 Meeting W/Utils,Bechtel & GE Re Containment Suppression Pool Swell Through Encroached Areas. List of Attendees,Slides & Handouts Encl

ML20128Q367
Person / Time
Site:	Grand Gulf
Issue date:	07/11/1985
From:	Hopkins J Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8507260662
Download: ML20128Q367 (30)

Text

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'n UNITED STATES NUCLEAR REGULATORY COMMISSION g

• } WASHING TON, D. C. 20555

/ July 11,1985 Docket No. 50-416 LICENSEE: Mississippi Power and Light Company FACILITY: Grand Gulf Unit 1

SUMMARY

OF JUNE 19, 1985 MEETING REGARDING CONTAINMENT SUPPRESSION POOL SWELL THROUGH ENCROACHED AREAS The purpose of the meeting was to discuss resolution of concerns regarding containment suppression pool swell through encroached areas. Enclosure 1 is a list of attendees. Enclosure 2 is a copy of slides and/or handouts prepared by an NRC consultant used in the meeting. Enclosure 3 is a copy of slides prepared by General Electric (GE) used in the meeting.

An NRC consultant presented a preliminary evaluation of encroached pool swell, which is not the NRC position at this time. This preliminary evaluation identified the existence of a water ligament near the containment wall where impact velocities can be greater than 50 ft./sec.

A GE representative made a presentation for the licensee regarding encroachment tests with blocked vents. These tests showed that blocking vents is a possible resolution to concerns regarding pool swell through encroached areas.

MP&L and the NRC staff agreed to have another meeting on this subject after further review of test data and the preliminary evaluation.

M' I)ESIGy oO ,,,',__

n B. Hopkin Project Manager Certiflod W j Licensing Branch No. 4 Division of Licensing

Enclosures:

As stated 8507260662 850711 PDR ADOCK 05000416 P PDR

~.

Enclos're 1 List of Attendees r I

6/19/85 -

NRC MP&L f J. Hopkins G. Smith I J. Kudrick W. Mashburn F. Eltawila .

B. Siegel  !

A.Sonin-consultant (MIT/8NL) I C.Economos-consultant (BNL) P Bechtel .GE R. Pernisi J. Torbeck E. Fotopoulos S. Sen Illinois Power Co. Gulf States Util.

J. Peterson L. England Cleveland Electric Ill. Co.

R. Pender I

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i ENCLOSURE 2 j

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TABLE 1: P0OL SWELL IN 1/10-$CALE SIMULATION 0F UNENCR0 ACHED P0OL (FROM FIGS. 1-5) ,

Frame No. time (sec), t Z,+ AZ, at V 1/10-scale full scale (ft) full scale (ft) (sec) (ft/sec) full scale full scale ,

5 0.103 0.326 6.4 8.0 3.1 0.116 27 10 0.140 0.442 9.5 11.8 4.5 0.121 37 i l

16 0.178 0.563 14.0 15.9 3.7 0.0758 49 20 0.202 0.638 17.2 24 0.227 0.717 > 22

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(psi) (psi) (psi)

Peak local from (full scale) ceiling pressure 0.9 containment ft.(a) wall. 4.5 7.8 11.1 3

28 Peak local ceiling pressure anywhere u_ on ceiling.(b) 7.2 . 12.5 17.9 Mo.

Peak average ceiling pressure (integrated pressure divided by area).(C) 2.8 4.8 6.9 8

NUREG-0978 specification of peak average 530 ceiling pressure. 8.8 19.4

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ENCLOSURE 3 e

GRAND GULF PLANT UNIQUE ENCROACHMENT TESTS WITH BLOCKED VENTS J.E. TORBECK 6/19/85

GRAND GULF ENCROACHMENT TESTS WITH BLOCKED VENTS SUMhARY DESCRIPTION o SAME HARDWARE AS GGNS PLANT UNIQUE TESTS 1/10 SCALE RECTANGULAR TEST TANK GGNS TIP PLATFORM BLOCKED TOP VENT (S) UNDER ENCROACHMENT o TWO CONFIGURATIONS TESTED ONE VENT BLOCKED TWO VENTS BLOCKED o TEST MATRIX

- THREE REPEAT TESTS WITH EACH CONFIGURATION SAME BLOWDOWN CONDITIONS AS GGNS BASE TESTS L

JET 6/19/85

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a =o. 28 6S0-1276 tuci.sAR ENERCY GENER ALO d ELECTRIC cav A of 42 BullNESS OPERATIONS FIGURE 1-1. TEST TANK AND SIMULATED GRAND GULF ENCROACHMENT f

TESTS VENTS BLOCKED ES, E6, E7 #1

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- GRAND GULF ENCROACHMENT TESTS WITH BLOCKED VENTS CONCLUSIONS l:

o ONE VENT BLOCKED (EQUIVALENT TO TWO IN PLANT)

I FROTH-LIKE IMPACT AT HCU FLOOR IN VICINITY OF

. ENCROACHMENT l

l NO EFFECT ON PDW CLEAN P0OL RESPONSE UNCHANGED o TWO VENTS BLOCKED (EQUlVALENT TO FOUR IN PLANT)

NEGLIGIBLE IMPACT AT HCU FLOOR IN VICINITY OF ENCR0ACHMENT SMALL EFFECT ON P DW l

l -

CLEAN POOL RESPONSE UNCHANGED l

l JET 6/19/85

EFFECT OF BLOCKED VENTS ON OTHER CONTAINMENT LOCA LOADS DRYWELL PRESSURE o MINIMAL INCREASE IN PEAK DW GAGE PRESSURE FOR DBA APPR0XIMATELY 1% WITH FOUR VENTS BLOCKED APPROXIMATELY 0.5% WITH TWO VENTS BLOCKED ANALYTICAL PREDICTIONS CONSISTENT WITH 1/10 SCALE TEST DATA P0OL SWELL o N0 INCREASE BECAUSE DW PRESSURE DOES NOT CHANGE o ASYMMETRIC LOAD BOUNDED BY 180* ASYMMETRIC POOL SWELL LOAD SPECIFIED IN MARK Ill CLR CONDENSATION OSCILLATION AND CHUGGING o N0 INCREASE IN LOADS AT UNBLOCKED VENTS SLIGHT INCREASE IN VENT MASS FLUX SLIGHT INCREASE IN LOCAL POOL TEMP o ASYhMETRIC LOAD B0UNDED BY POOL SWELL ASYMMETRIC LOAD JET 6/19/85

. s "- ,

'W MEETING

SUMMARY

DISTRIBUTION

, ,,y-,;-w:gry- ,,

i( W SD(s): 96416 :4 NRC PDR 4I local PDR NSIC PRC System LB #4 r/f Attorney, OELD >

E. Adensam Project Manager J. Hookins Licensing Assistant M. Duncan -

NRC PARTICIPANTS J. Hopkins J. Kudrick F. Eltawila

8. Siegel bec: Applicant & Service l ht

-- _-____ --__-_ - _ - -- - "