ML20077H963

Informs That Detailed Review of Mod of Automatic Depressurization Sys Logic Has Allowed Applicant to Commit to Mod for Unit 1 Prior to Fuel Load W/No Change in Aug 1984 Fuel Load Date

ML20077H963
Person / Time
Site:	Limerick
Issue date:	08/10/1983
From:	Wetterhahn M CONNER & WETTERHAHN, PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Brenner L, Cole R, Morris P Atomic Safety and Licensing Board Panel
References
NUDOCS 8308120124
Download: ML20077H963 (2)

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! 1.AW FFICES C0CMETED CONNER Sc WETTERHAHN. P.G. UNC 1747 PENNSYLVANIA AVENUE. N. W.

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j Judge Lawrence Brenner Judge Richard F. Cole Atomic Safety and Atomic Safety and Licensing Board Licensing Board

U.S. Nuclear Regulatory U.S. Nuclear Regulatory Commission Commission Washington, D.C. 20555 Washington, D.C. 20555 Judge Peter A. Morris Atomic Safety and

- Licensing Board j U.S. Nuclear Regulatory j Commission Washington, D.C. 20555 In the Matter of

Philadelphia Electric Company (Limerick Generating Station, Units 1 and 2)

Docket Nos. 50-352 and 50-353 Gentlemen:

l The Licensing Board's Second Special Prehearing Conference Order (LBP-83-39) admitted Limerick Ecology Action's Contention I-33M relating to the schedule for modification of the automatic depressurization system (ADS) logic to eliminate the need for manual actuation to assure adequate core cooling. The Applicant had originally planned

to make the required modification for Unit 1 at the first

refueling outage.

i As detailed in the attached letter from Mr. John S.

!' Kemper to Mr. A. Schwencer, a detailed review of this

modification has allowed the Applicant to commit to make this change on Unit 1 prior to fuel load with no change in the August 1984 fuel load date. A draft page change to the 8308120124 830810 PDR ADOCK 05000352 9 PDR

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Judga Lawrenca Brennor Judge Richard F. Cole Judge Peter A. Morris August 10, 1983 i

Page 2 FSAR which is scheduled for submission in September 1983 is

! attached to the letter.

Sincerely, 4M Mark J. tterhahn Counsel for Philadelphia -

Electric Company i

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MJW/dlf Enclosure i

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JOHN S. KEMPEn

,,u...,=='-' AUG 08i19834 ENG4M4& feING ANO RCSE ARCM Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Limerick Generating Station, Units l&2 ,

NUREG-0737, Item II.K.3.IS, " Modification of Automatic Depressurization Sys tem Logic"

Reference:

J. S. Kemper to A. Schwencer letter dated June 20, 1983 File: GOVT l-1 (NRC)

Dear Mr. Schwencer:

In the reference letter we described our proposed resolution to TMI Item II.K.3.18 in which we committed to implement option 4 of the BWR Owners' Group Generic Response to NUREG-0737 with implementation to be completed by the first refueling outage after fuel load. However, a more recent and detailed review o f this modification has revealed that this change can be made on Unit I prior to fuel load with no change in our August, 1984 fuel load date.

The attached revised draft FSAR page change to TMI Item II.K.3.18 will be incorporated into the FSAR, exactly as it appears on the attachment, in the revision scheduled for September, 1983.

Sincerely, RJS/gra/68 Copy to: See Attached Service List ekANY

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c c ', Judge Lawrence Brenner (w/o enclosure)

Judge Richard F. Cole (w/o enclosure)

Judge Peter A. Morris (w/o enclosure)

Troy B. Conner, Jr., Esq. (w/o enclosure)

Ann P. Hodgdon, Esq. (w/o enciasure)

Mr. Frank R. Romano (w/o enclosure)

Mr. Robert L. Anthony (w/o enclosure)

Mr. Marvin I. Lewis (w/o enclosure)

Judith A. Dorsey, Esq. (w/o enclosure)

Charles W. Elliott, Esq. (w/o enclosure)

Jacque11re I. Ruttenberg (w/o enclosure)

Thomas Y. Au, Esq. (w/o enclosure)

Mr. Thomas Gerusky (w/o enclosure)

Director, Pennsylvania Emergency Management Agency (w/o enclosure)

Mr. Steven P. Hershey (w/o enclosure)

Angus Love, Esq. (w/o enclosure)

Mr. Joseph H. White, III (w/o enclosure) 1 David Warsan, Esq. (w/o enclosure)  ;

Robert J. Sugarman, Esq. (w/o enclosure)

Martha W. Bush, Esq. (w/o enclosure)

Spence W. Perry, Esq. (w/o enclosure)

Atomic Safety and Licensing Appeal Board (w/o enclosure)

Atomic Safety and Licensing Board Panel (w/o enclosure)

Docket and Service Section (w/o enclosure) i e

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.. LGS FSAR Outage date

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b. Duration of outage

c. Cause of outage

d. Emergency core cooling system or component involved

e. Corrective action taken The above information will be assembled into a report, which will also include a discussion of any changes, proposed or implemented, deemed appropriate, to improve the availability of the emergency core cooling equipment. ._- -

• II.K.3.10 MODIFICATION OF ADS LOGIC - FEASIBILITY FOR INCREASED DIVERSITY FOR SOME EVENT SEQUENCES .

Position The automatic depressurization system (ADS) actuation logic should be modified to eliminateAthe need forand feasibility manual actuation to assure risk assessment study is adequate core cooling.

required to determine the optimum approach. One possible scheme that should be considered is ADS . actuation on low reactor-vessel water level provided no high pressure coolant injection or high

( pressure core spray flow exists andThis a low pressure logic would emergency complement, core not cooling (ECC) system is running.

replace, the existing ADS actuation logic. ,

-/ Response --

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, , . . S The BWR Owners Group has submitted a report in NEDO-24951 to the I NRC in which they propose five options to address this concern.

Limerick will take steps to make the required modifications to the ADS logic when the NRC rules on the acceptability of the proposed options. This modification will be implemented during J

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refueling outage.

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% K.d. 8 S w; e I I .,K . 3 . 21 RESTART OF CORE SPRAY AND LPCI SYSTEMS Irem bs on Pems.ted perse Position b l /.J. Jpedh/(,!.nu<>..d.

to sr<il a f= = f.s se w ,, , s n.fl M r eJs The core spray and LPCI system flow may"be# sEoNed$ Ifie 98#,;@v D af operator. These systems will not restart automatically on loss The 1- v -d<-

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of water level if an initiation signal is still present. N core spray and LPCI system logic should be modified so that thesecki systems will restart if required to assure adequate core cooling.* * ***APs / .no Because'this design modification affects several core cooling s~/eca, modes under accident conditions, a preliminary design should be submitted for staff review and approval prior to making the actual modification.

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1.13-66a Rev. 20, 05/83 t