ML17139B817

Discusses Util Response to Condition 4 Associated W/Tmi Action Plan Item II.K.3.18 Re Automatic Depressurization Sys Timer Setting.Proposed Bypass Timer Setting of 480 Acceptable.Safety Evaluation Encl

ML17139B817
Person / Time
Site:	Susquehanna
Issue date:	09/20/1983
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
References
TASK-2.K.3.18, TASK-TM NUDOCS 8310050125
Download: ML17139B817 (4)

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SEP 2 0 f983 Docket No.:

50-387/388 Mr. Norman M. Curtis Ace Presf dent Engfneerfng and Construction - Nuclear Pennsylvania Power

& Light Company 2 North NfnghtStreet

Allenwn, Pennsylvania 18'IOl

0 DISTRIBUTION:

Document Control NRC PDR Local PDR NSIC PRC LBP2 File EHylton RPerch Region I

ELJordan, DEJA: IE

JMTaylor, DRP:IE

Cutchin, OELD ACRS (16)

Subject:

Susquehanna Automatic Depressurfzatfon System (ADS) Timer Setting In a letter from A. Schwencer to N, Curtis dated April 25, 1983, the NRC staff accepted the PP8L adoption of Option 4 of the BHR Owners Group Report on TMI Actfon Plan Item II.K.3.18 "Modification of Automatic Depressurfzatfon System (ADS) Logic - Feasibility for Increased Diversity for Some Event SequencesU The acceptability of Option 4 to the staff included the following condf tions:

(1)

Installation on Unit 1 must be completed prior to startup following the first refueling outage; Unit 2 installation must be completed prior to initial crftfcalfty, (2)

Technical Specifications must be provided for the bypass timer and manual inhibit switch, (3)

Use of the inhibit switch must be addressed in the plant emergency procedures, and (4)

A plant specific analysis must be provided to )ustify the ADS high drywell pressure permfssfve bypass timer setting In response to condition 4 above, PP8L provfded the proposed setting for the ADS high drywell pressure permissive bypass timer fn a letter dated July 7, 1983.

The NRC staff has reviewed the licensee's proposed bypass timer setting of 480 seconds and finds ft to be acceptable.

The NRC staff evaluation of the licensee's proposed bypass timer setting fs enclosed.

Sincerely,

~CTeaI CfgaeO by<

A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing

Enclosure:

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Susquehanna Mr. Norman W. Curtis Vice President Engineering and Construction Pennsylvania Power

& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 ccs:

Jay Silberg, Esquire Shaw, Pittman, Potts

& Trowbridge 1800 M Street, N.

W.

Washington, D. C. 20036 Edward M. Nagel, Esquire General Counsel and Secretary Pennsylvania Power

& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. William E. Barberich Nuclear Licensing Group Supervisor Pennsylvania Power

& Light Company

~ 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. G.

Rhodes Resident Inspector P. 0.

Box 52 Shickshinny, Pennsylvania 18655 Gerald R. Schultz, Esquire Susquehanna Environmental Advocates P. 0.

Box 1560 Wilkes-Barre, Pennsylvania 18703 Hs. Colleen Harsh P. 0.

Box 538A, RD g4 Mountain Top, Pennsylvania 18707 Hr. Thomas J. Halligan Correspondent The Citizens Against Nuclear Dangers P. 0. Box 5

Scranton, Pennsylvania 18501 Mr. J.

W. Hillard Project Manager Hail Code 395 General Electric Company 175 Curtner Avenue San Jose, California 95125 Robert W. Adler, Esquire Office of Attorney General 505 Executive House P. 0. Box 2357 Harri sburg, Pennsyl vania 17120 Mr. E. B. Poser Project Engineer Bechtel Power Corporation P. 0.

Box 3965 San Francisco, California 94119 Dr. Judith H. Johnsrud Co-Director Environmental Coalition on Nuclear Power 433 Orlando Avenue State College, Pennsylvania 16801 Mr. Thomas M. Gerusky, Director Bureau of Radiation Protection Resources Commonwealth of Pennsylvania P. 0.

Box 2063 Harrisburg, Pennsylvania 17120

SUSQUEHANNA STEAM ELECTRIC STATION UNITS 1

5 2 SAFETY EVALUATION REPORT In a letter dated July 7, 1983 from N. H. Curtis to the Director,

NRR, Pennsylvania Power 5 Light Company (the licensee) provided the results of analyses to determine the setting for the ADS high drywell pressure permissive bypass timer.

The timer setting was determined by consideration of loss-of-.

coolant accidents (LOCA), loss of inventory events, and ATWS events.

The analyses were initially performed using realistic models and inputs in order to establish a range of possible settings.

The licensee then selected a

480 second setting and performed LOCA and loss-of-inventory event calculations using approved Appendix K models.

The peak cladding temperature for the worst case event with a timer setting of 480 seconds was calculated to be 1500'F.

This is below the PCT limit of 2200'F.

The NRC staff has reviewed the licensee's proposed setting for the ADS bypass timer and the results of his supporting analysis.

The NRC staff concludes that the proposed timer setting of 480 seconds is acceptable.