ML20248D787

Correction for NRC Staff Response to Commission Questions.* Forwards Corrected Page 5 to NRC Response to Questions Filed on 890802,deleting Phrase by Nearly Factor 2.5 in Next to Last Line.W/Certificate of Svc

ML20248D787
Person / Time
Site:	Limerick
Issue date:	08/03/1989
From:	Hodgdon A NRC OFFICE OF THE GENERAL COUNSEL (OGC), PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
CON-#389-8992 OL-2, NUDOCS 8908110134
Download: ML20248D787 (4)

Text

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August 3,193g.,

4 usi.c UNITED STATES OF AMERICA NUCLEAR' REGULATORY COMMISSION 89 E -3 P4

13-BEFORE THE COMMISSION Or %

D OC M.T L..,

,r In the Matter of PHILADELPHIA ELECTRIC COMPANY Docket Nos. 50-352-OL-2 50-L3-OL-2 4(Limerick Generating Station Units 1 and 2)

(SevereAccidentMitigation DesignAlternatives)

CORRECTION FOR NRC STAFF RESPONSE TO COMMISSION QUESTIONS 0? **tgust 2, 1989, the NRC Staff filed its " Response to Commission

-Questions." The~ response as filed contains an error. On page five,

-the phrase "by nearly a factor 2.5" in the next to the last line should-not appear there. The Staff is substituting a new page 5 with these words deleted.

The Staff regrets any inconvenience to the Commission and the parties.

l Respectfully submitted, g

l vvvt on m Ann P. Hodgdon l-Counsel for NRC Staff k l

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8908110234 890003 7

PDR ADOCK 05000352 O

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of these alternatives is bounded by the estimates provided by the licensee for the six mitigation alternatives indicated in ALAB-819.

. Q.2.. Provide an evaluation of the incremental environmental effects from the risk of severe accidents of operation of Limerick with no SAMDAs in place for one fuel cycle.

Response

The Final Environmental Statement for Limerick provides estimates of societal risks from severe accidents initiated by internal events and externalevents(seismic, fire,andfloods). Estimated values for selected risk measures are reproduced in Table 1.

The risk estimates were based on core damage frequency estimates appropriate at that time.

Sincethestaffreview(1984),thelicenseehasmadenumerous modifications to plant hardware and procedures as described by the utility in a June 23, 1989 submittal and described in a July 27, 1989 meeting with the staff. Two of the modifications made by the licensee were in response to insights / recommendations identified in NUREG-1068. These involve improvedAutomaticDepressurizationSystem(ADS)initiationlogic following the potential loss of high pressure coolant sources, and improved design to achieve an alternate method of room cooling for High Pressure Injection systems during loss of offsite power events. The staff considers these improvements to be worth a factor of 2.5 reduction in core damage frequency for the most likely accident scenarios. As a result, the FES estimates of risk would be reduced. Table 2 presents these reduced values of risk.

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m.w UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION

'89 AUG ~3 P4 :13 BEFORE THE COMMISSION g,

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'F M IN A NCe In the Matter of PHILADELPHIA ELECTRIC COMPANY Docket Nos. 50-352-OL-2 50-353-OL-2 (Limerick Generating Station Units 1and2)

(SevereAccidentMitigation

)

DesignAlternatives)

CERTIFICATE OF SERVICE I hereby certify that copies of " CORRECTION FOR NRC STAFF RESPONSE TO COMMISSION QUESTIONS" in the above-captioned proceeding have been served on the following by deposit in the United States mail, first class, or as indicated by an asterisk through deposit in the Nuclear Regulatory Commission's internal mail system, or. as indicated by a double asterisk by use of express mail service, or as indicated by a triple asterisk by hand-delivery, this 3rd day of August, 1989:

Morton B. Margulies, Chairman

• Frederick J. Shon, Esq.*

Administrative Judge Administrative Judge

' Atomic Safety and Licensing Board Atomic Safety and Licensing Board U.S. Nuclear Regulatcry Commission U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Washington, D.C.

20555 Troy B. Conner, Jr., Esq.**

Thomas M. Gerusky Conner & Wetterhahn, P.C.

Bureau of Radiation Protection 1747 Pennsylvania Avenue, N.W.

Dept. of Environmental Resources Washington, D.C.

20006 Third and Locust Sts., 5th Flocr Harrisburg, PA 17120 Atomic Safety and Licensing Board Panel *(1)

Dr. Jerry Harbour

• U.S. Nuclear Regulatory Commission Administrative Judge Washington, D.C.

20555 Atomic Safety'and Licensing Board U.S. Nuclear Regulatory Comissicn Charles E. Rainey, Jr., Esq.

Washington, D.C.

20555 Chief Deputy City Solicitor City of Philadelphia Gregory Dunlap, Esq.

1 Reading Center, 5th Floor Deputy General Counsel Philadelphia, PA 19107 Office of General Counsel S33 Market Street, 17th Fir.

David Stone Harrisburg, PA 17120 Limerick Ecology Action, Inc.

P.O. Box 761 Pottstown, PA 19464

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David Wersan, Esq.

Atomic Safety and Licensing.

~ Assistant Consumer Advocate.

Appeal Board Panel (5)*

Office of Consumer Advocate U.S. Nuclear Regulatory Commission g

J 1425 Strawberry Square Washington, D.C.

20555.

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Harrisburg, PA 17120 Charles W. Elliott**

Edward G. Bauer, Jr., Esq.

Poswistilo, Elliott.& Elliott Vice President and General Counsel 1101 Northampton Street

-Philadelphia Electric Company 2301 Market Street J-Suite 201

.18042 Philadelphia, PA 19101 Easton, PA Office of the Secretary ***-

Adjudicatory-File

• U.S. Nuclear Regulatory Commission Atomic Safety'and Licensing Board Washington,'D.C.

20555 U.S. Nuclear Regulatory Commission Washington, D.C.

20555 W

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Ann P.- tiodgdon g

Counsel for NRC Staff l

-