ML20077H620
| ML20077H620 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/08/1983 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.18, TASK-TM NUDOCS 8308110139 | |
| Download: ML20077H620 (3) | |
Text
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9 PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 1881 -1981 PHILADELPHIA. PA.19101 JOHN S. KEMPER
".'ll!!"'fl::.
AUG 081983 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.!S, " Modification o f Automatic Depressurization System Logic" Re ference :
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 of this modification has revealed that this change can be made on Unit I prior to fuel load with no change in our August, 1934 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 go8(4 8308110139 830908 PDR ADOCK 05000352 l [
A PDR m
e e
cc:. 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)
Inn P. Hodgdon, Esq.
(w/o enclosure)-
h 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)
Jacqueline 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)
David Wersan, 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) s
\\
(~i a.
Outage date 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.3.13 MODIFIC4".!ON OF ADS LOGIC - FEASIBILITY FOR INCREASED DIVERSITY FOR SOME EVENT SEQUENCES Position The automatic depressurization system (ADS) actuation logic should be modified to eliminate the need for manual actuation to assure adequate core cooling.
A feasibility and risk assessment study is 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 k
pressure core spray flow exists and a low pressure emergency core cooling (ECC) system is running.
This logic would complement, not replace, the existing ADS actuation logic, c
Response
g_
The BWR Owners Group has submitted a report in NEDO-24951 to the
)
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.
Tnis modification will be implemented during Mhe first refueling outage.
/
o[n 4 as W iieed in + he. 5W;L O wner.so &mp Cxneric Resen 4o M us-o 737 II.K.3. 21 RESTART OF CORE SPRAY AND LPCI SYSTEMS Item E K.S.tB w>ll bo in glemental priu-4o Position
. & I /4 J. s pec #.c.,/LHme,.d;f,who o e il be. nie. na a
r wficf The core spray and LPCI system flow may*SN# shohd by Yflh
$[;[77a pg operator.
These systems will not restart automatically on oss a wswe;nu/
of water level if an initiation signal is still present.
The lov wder reyef.
core spray and LPCI system logic should be modified so that theseani to add systems will restart if required to assure adequate core cooling.da ADS Because this design modification affects several core cooling man %l inhib;F modes under accident conditions, a preliminary design should be ew ac4, submitted for staff review and approval prior to making the
(.
actual modification.
l 1.13-66a Rev. 20, 05/83 l