ML20086K710
| ML20086K710 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/09/1991 |
| From: | Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-20, NYN-91191, NUDOCS 9112130258 | |
| Download: ML20086K710 (2) | |
Text
.3 4
New Hampshire Ted C. Feigenbaum h
Presdent and Chief Executive Olhcer NYN-91191 December 9, 1991 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Document Control Desk
References:
(a)
Pacility Operating License No. NPF-86, Docket No.30-443 (b)
USNRC Generic Letter 88-20, Supplement 4 dated June 28, 1991,
" Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities" (c)
NHY Letter NYN-89136 dated November 1,1989, " Response to Generic Letter 8S 20", T. C. Feigenboum to USNRC (d)
NHY Letter NYN-91034 dated March 1,1991, " Supplementary Response to Generic Letter 88-20", B. L. Drawbridge to USNRC (c)
PSNH Letter S B N-617 dated January 30, 1984, "Scabrook Station Probabilistic Assessment Main Report and Summary R e p o r t",
J. DeVincentis to USNRC S ubject:
Response to Generic Letter 88-20, Supplement 4 Gentlemen:
This letter provides information pertaining to the New Hampshire Yankee (NHY) program for performing the external events portion of the Individual Plant Examination for Severe Accident Vulnerabilities (IPE) for Seabrook Station.
NHY previously stated that it had fulfilled the int::nt of Generic Letter 88 20 to perform a systematic examination to identify plant-specific vulnerabilities to severe accidents (Reference (c)]. New Hampshire Yankee fulfilled this intent by completing the Seabrook Station Probabilistic Safety Assessment (SSPS A) and establishing an ongoing risk management process. The SSPSA is a full-scope, level three probabilistic safety assessment which includes full consideration of external events and internal transients as initiating events which could potentially cause a severe accident. The SSPSA was completed in 1983 and submitted to the NRC for review in 1984 [ Reference (c)].
Comprehensive updates of the SSPSA were completed in 1986 and 1989.
NHY forwarded the IPE Report on March 1,1991 [ Reference (d)l, which summarived the updated SSPSA and arranged the findings and results of the updated SSPSA in a format consistent with that of the IPE submittal guidance. External hazard events were included in the results and conclusions of the iPE report.
9112130258 911203 PDR ADOCK 0"~,000443 P
PDR New Hampshire Yankee Division of Public Service Company of New Hampshi.e
_vv P.O. Box 300 = Seabrook, NH 03874 = Telephone (603) 474-9521
,6 ip
e t
,a
._ t U'nited States Nuclear Regulatory Commission December 9,1991 Attention:
Document Control Desk Page two New llampshire Yankee will update the external events portion of the previously submitted. SSPSA to account for current plant design and procedures. This update will incorporate currently available data and apply current methodology for fire hazard analysis.
It will also include an updated scismic fragility study. The updated seismic and fire hatards analyses will be performed using probabilistic risk methods, Other hazards will be evaluated
.. using a screening approach based on the 1975 Standard Review Plan (NUREG-75/087). Plant walkdowns will be performed as needed to confirm analysis assumptions, New Hampshire Yankee will submit a report on the Individual Plant Examination of External Events (IPEEE) by October 2,1992.
The IPEEE Report will-summarize the i
updated cxternal events portion of the previously submitted SSPSA and arrange the findings and results of this update in a format consistent with that of the IPE submittal guidance in NUREG 1407.
Should you have any questions regarding the IPEEE Report, please contact Mr.
. Kenneth L. Kiper at (603) 474 9521, extension 4049.
- Very truly yours,
[',hyp ~-
Ted C. Fei nbaum TCF:GKiss cc:
Mr; Thamas T. Martin Regicaal Administrator U. S. Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406 Mr. Gordon E. Edison,- Sr.-
Project Manager i
Project Directorate 1-3 Division of Reactor Projects U.S. Nuclear Regulatory Commission l
Washington, DC 20555 Mr. Noc! Dudley NRC Senior Resident Inspector P.O. Box 1149 Seabrook, Nil 03874 l
l' Mr. John Butler Nuclear Management & Resources 1776 Eye Street, N. W., Suite 300 Washington, D. C.
20006-2496 i
I