ML17158A450

Forwards Facsimile Sent by Util Concerning ATWS Events Resulting in Venting Containment to Be Placed in Docket File & PDR

ML17158A450
Person / Time
Site:	Susquehanna
Issue date:	08/31/1994
From:	Poslunsky C NRC
To:	NRC
References
NUDOCS 9409060038
Download: ML17158A450 (10)

Text

August 31, 1994 Docket Number:

50-387 8 50-388

Susquehanna Units 1

and 2

Pennsylvania Power and Light Company (PPKL)

NOTE TO:

Docket File Attached is a facsimile sent to me from PP&L concerning ATWS events resulting in the venting of containment.

Please place it in the docket file and PDR.

No additional internal distribution is necessary.

C4 Chet Poslus y

PM> Susquehanna cc J.

Chung L. Phillips 9'409060038 9408317 PDR ADQCK 05000387 P

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PPL NUC LICENSING PAGE

.82 hTPVS Eveats That Result fn Ventlni the Containment.

There is much discussion concerning the BWROG HPG contingency 5 and the PPN, implementation ofthis contmgency.

PP&L has taken deviations to this generic guidance.

These deviations, the rationale that lead to their development and the justNcation fortheir implementation are discussed in the PP&L report NH-92-001 and the safety evaluations NL-~16, -017, -020, -021. Sased upon the calculations described in these docLunenta, PP&L has demonstrated that in aH case iranhel but one, the PP&L strategy results in greater margin for core cooling, lower suppression pool temperature, lower containment pressure, and lower utmrtainty concerning the outcome ofthe event. The only case where this is not true is an MSIVclosure with fhBure of

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either RPS and ARIor both Scram Discharge Volumes,

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both SLCS pumps to inlect,

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two CRD pumps to operate fortwo hours, and success ofthe containment vent system. Ifin addition to the failures identified above, the containment vent is also unavailable, the BWROG strategy ofFers no additional protection.

Therefore the strategy implemented by PP&L represents the best approach for dealing with ATWS at Susquelenna.

The combination oflures and success identified above requires that the failures be independent, since these systems share common support systems; electric power and instrunlnt air. Failure ofthe AC busses that energize the SLCS and CRD systems are required forvent operation, Failure ofinstrument air, which is required for manual rod insertion, alsoIthe vent systems.

Thus this particular accident sequence requires success ofthe common support systems and independent fhilure ofthe f'ront-line equipment, Tierefore this sequence is vanishingly small. This is conclusion is varied by the foHowing probability calcLdation.

SYMBOL VALUE MSIVIsolation Frequency F

%ithout Scam Electrical Partition P~,

Mechanical Partition P~

AMFails Both SLCS Pumps Fail P~

Manual Rod Insertion FaHs P~

Both SDVs Pail Psnv 0.3/year

$.0 x 10~

2/3 1/3 4.0 x 1%

1.2x 10 1.0 x 1W 0.01

88/31/1994 14:15 PPL NUC LICENSING PAGE 83 P

PxP~~ P xP~ P i8 z 10

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MEMORANDUM TO:

W. Ru~ll F. Hi~lia A. Thadani R.

Zimmerman D. Crutchfield W. Travers F. Gillespie S.

Varga ADRI/DRPE G. Lainas J.

Roe August 23; 1994 J. Zwolinski E.

Adensam B. Grimes B. Sheron B. D. Liaw G. Holahan H. Vlrgilio R. Spessard B. Boger C.

Thomas D/DRSS

'ef,

ROS, EDO Caldwell Operations Center R. Cooper, RGI E. Herschoff, RGII E.

Greenman, RGIII A. Bill Beach, RGIV K. Perkins,

RGIV, WCFO THRU:

FROM'UBJECT:

Mohan C. Thadani, Acting Director Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Chester Poslusny, Jr.,

Sr. Project Manager Project Directorate I-2 Division of Reactor Projects I/II Office -of Nuclear Reactor Regulation DAILY HIGHLIGHT FORTHCOMING HEfTING WITH PENNSYLVANIA POWER AND LIGHT COMPANY SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1

AND 2 DATE & TIME:

Tuesday, August 30, 1994 8:30 a.m.

4:00 p.m.

LOCATION:

PURPOSE:

Pennsylvania Power

& Light Co.

Two North Ninth Street Allentown, Pennsylvania 18101-1179 To discuss the electri.cal isolation for Class lE/non-1E circuits at the Susquehanna units.

PARTICIPANTS*:

NRC NRR Office of Nuclear Reactor Re ulation C. Poslusny, NRR J. Stewart, NRR F.

Gee, NRR 1

Docket Nos.

50-387/388 cc:

See next page PP&L J.

Kenny N. Coddington G. Hiller B. Garner P.

Brady J.

Akus D. Woods et al.

CONTACT:

C. Poslusny

'408260149 9408>

504 1402 pDR ADOCK 05000387I

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p PDR~

• Meetings between NRC technical staff and applicants or licensees are open for interested members of the public, petitioners, intervenors, or other parties to attend as observers, pursuant to "Open'eeting Statement of NRC Staff Polic," 43 Federal

'Re ister 28058, 6

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CPoslnsn:tlc 4 nisi I" adani QP3 OFFICIAL RECORD COPY i FILENAME: R: iMTGHI

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MEMORANDUM THRU:

FROM:

SUBJECT:

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 23, 1994 J. Zwolinski E.

Adensam B. Grimes B. Sheron B.

D. Liaw G. Holahan M. Virgilio R. Spessard B., Boger C.

Thomas D/DRSS Mohan C. Thadani, Acting Director Project Directorate I-2 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation C Chester Poslusny, Jr., Sr. Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation TO:

W. Russell F. Miraglia A. Thadani R.

Zimmerman D. Crutchfield W. Travers F. Gillespie S. Varga',

ADRI/DRPE G. Lainas J.

Roe

Chief, ROS, EDO J. Caldwell Operations Center R.'ooper, RGI E. Merschoff, RGII E.

Greenman, RGIII A. Bill Beach, RGIV K. Perkins,

RGIV, WCFO DAILY HIGHLIGHT FORTHCOMING MEETING WITH PENNSYLVANIA POWER AND LIGHT COMPANY SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1

AND 2 DATE & TIME:

Tuesday, August 30, 1994 8:30 a.m.

4:00 p.m.

LOCATION:

PURPOSE:

Pennsylvania Power Im Light Co.

Two North Ninth Street Allentown, Pennsylvania 18101-1179 To discuss the electrical isolation for Class lE/non-lE circuits at the Susquehanna units.

PARTICIPANTS*:

NRC NRR Office of-Nuclear Reactor Re ulation C. Poslusny, NRR J. Stewart, NRR F.

Gee, NRR Docket Nos.

50-387/388 cc:

See next page CONTACT:

C. Poslusny 504-1402 PPKL J.

Kenny N. Coddington G. Miller B. Garner P.

Brady J.

Akus D. Woods et al.

• Meetings between NRC technical staff and applicants or licensees are open for interested members of the public, petitioners, intervenors, or other parties to attend as observers pursuant to "Open Meeting Statement of NRC Staff Policy," 43 Federal Receister 28058, 6/28/78.

A bf

Pennsylvania Power

& Light Company Susquehanna Steam Electric Station, Units 1

& 2 CC:

Jay Silberg, Esq.

Shaw, Pittman, Potts

& Trowbridge 2300 N Street N.W.

Washington, D.C.

20037 Bryan A. Snapp, Esq.

Assistant Corporate Counsel Pennsylvania Power

& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. J.

M. Kenny Licensing Group Supervisor Pennsylvania Power

& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. Scott Barber Senior Resident Inspector U. S. Nuclear Regulatory Commission P.O, Box 35 Berwick, Pennsylvania 18603-0035 Mr. William P. Dornsife, Director Bureau of Radiation Protection Pennsylvania Department of Environmental Resources P. 0, Box 8469 Harrisburg, Pennsylvania 17105-8469 Mr. Jesse C. Tilton, III Allegheny Elec. Cooperative, Inc.

212 Locust Street P.O.

Box 1266 Harrisburg, Pennsylvania 17108-1266 Regional Administrator, Region I

U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Mr. Harold G. Stanley Superintendent of Plant Susquehanna Steam Electric Station Pennsylvania Power and Light Company Box 467 Berwick, Pennsylvania 18603 Mr. Herbert D. Woodeshick Special Office of the President Pennsylvania Power and Light Company Rural Route 1,

Box 1797 Berwick, Pennsylvania 18603 George T; Jones Manager-Engineering Pennsylvania Power and Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. Robert G.

Byram Senior Vice President-Nuclear Pennsylvania Power

& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101

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4 DISTRIBUTION Meetin Notice Hi hli ht

+Docket File~

NRC 8 Local PDRs PDI-2 Reading HThadani CPoslusny HO'Brien A. Chaffee, OEAB OGC E. Jordon, 0/AEOD J.

Steward F.

Gee ACRS (10)

II OPA NRR Mailroom, PMAS, 12/G/18 T. Gody, ILPB W. Dean, EDO [Region I Plants] '017G21 E. Wenzinger, RI J. White, RI K. Abraham/D. Screnci, RI cc:

Licensee 5 Service List

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