ML20044F260
| ML20044F260 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 05/18/1993 |
| From: | Masnik M Office of Nuclear Reactor Regulation |
| To: | Cross J PORTLAND GENERAL ELECTRIC CO. |
| References | |
| TAC-M85979, TAC-M85980, NUDOCS 9305270261 | |
| Download: ML20044F260 (5) | |
Text
WC h
pac %
Eip. 3 y [
. g g _W )/t{
NUCLEAR REGULATORY COMMISSION UNITED STATES j ih c'
2 WASH!NGToN, D.C. 20555-0301
- g p
May 18, 1993 Docket No. 50-344 Mr. James E. Cross Vice President, Nuclear Portland General Electric Company 121 S.W. Salmon Street Portland, Oregon 97204
Dear Mr. Cross:
SUBJECT:
REQUEST FOR EXEMPTIONS FROM REQUIREMENTS FOR EMERGENCY PLANNING AND APPROVAL 0F THE PERMANENTLY DEFUELED EMERGENCY PLAN (TAC NOS. 85980 AND 85979)
In a letter dated March 9,1993, Portland General Electric (PGE or the licensee) requested an exemption from 10 CFR 50.47 " Emergency Plans" and 10 CFR Part 50, Appendix E, Paragraph IV, " Content of Emergency Plans". This request, if granted, would allow for the discontinuance of the need for offsite emergency planning and reduce the onsite planning to a level described in the Trojan Permanently Defueled Emergency Plan. The Permanently Defueled Emergency Plan for Trojan Nuclear Plant was forwarded to the NRC for review and approval by a separate letter from PGE, also dated h ech 9,1993.
The staff has determined that the most significant potential accident associated with a permanently defueled and shutdown reactor involves the spent f;el stored on site. The postulated accident sequence involves the complete or partial loss of water from a spent fuel pool containing recently offloaded fuel. This beyond design basis accident sequence could result in a zirconium fuel cladding fire that could propagate through the spent fuel storage pool and result in significant offsite consequences. Although such an accident is beyond the design bases, it may be considered within the spectrum of accidents that could require continuance of the offsite emergency plan. Description of the accident sequence and estimates of impact are contained in NUREG-1353, and behavior of the fuel during heatup is described in NUREG/CR-0649. Considera-tion of this accident scenario is limited to the period of time that the spent fuel is thermodynamically capable of a cladding fire. This time period of concern has been estimated to be about one to three years depending on the fuel burnup and the spent fuel storage configuration.
Before the staff can begin its detailed review of your request to discontinue the need for offsite-emergency planning and the approval of your permanently defueled emergency plan the staff requires the following:
1.
An estimate of the date that the Trojan Nuclear Plant spent fuel is no longer thermodynamically capable of generating enough heat to result in a cladding fire in the absence of water. This estimate should consider both the perfect and imperfect ventilation scenarios
}
m e sy qyn rT
- ?' u a u'" w
~
ggpqggugi88g*gp t
y
.Hr. James E. Cross !
3 as described in Section 4 of NUREG/CR-0649. A detailed explanation of how this date was determined is to be included.
j 2.
Information that will demonstrate that due to site-specific i
considerations, and supporting analyses, the possibility of a cladding fire in the spent fuel pool is sufficiently Leyond a design basis accident to not warrant requiring any continuing offsite emergency. preparedness.
3.
An evaluation of those offsite preparedness measures which may not be required even if a cladding fire is postulated because of the time available after water loss in the pool and before a fire could be initiated.
l
}
Until the staff acts on both the request for an exemption to the regulations and the request for approval of the permanently defueled emergency plan, PGE must continue to meet regulatory requirements in 10 CFR 50.54 (q) regarding emergency preparedness. Due to the complexity of-this review it is_ possible that the staff will be unable to complete the review by the date you have requested.
However, I can assure you that all available staff resources _ are l
being utilized to resolve this issue in a timely manner. The staff under-stands that some of the contracts for offsite emergency response services'will expire during the month of June 1993.
PGE should make arrangements to extend these contracts should the review of the relief requests extend past the current expiration date of the contracts.
The reporting and/or recordkeeping requirements contained.in this letter affect fewer than 10 respondents, therefore, OMB clearance is not required under P.L.96-511.
Sincerely, Ne
/
Michael T. Masnik, Senior Project Manager Non-Power Reactors and Decommissioning i
Project Directorate Division of Operating Reactor. Support.
Office of Nuclear Reactor Regulation cc: See next page t
)
i 1
l
l Mr. James E. Cross Trojan Nuclear Plant Portland General Electric Company
. Docket No. 50-344 i
CC.
Senior Resident Inspector.
'I U.S. Nuclear Regulatory Commission l
Trojan Nuclear Plant.
j P. O. Box 250 i
Rainier, Oregon 97048 Mr. Michael J. Sykes, Chairman l
Board of County Commissioners Columbia County St. Helens, Oregon 97501 i
Mr. David Stewart-Smith Oregon Department of-Energy I
Salem, Oregon 97310 Regional Administrator, Region V
-i U.S. Nuclear Regulatory Commission j
1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Tom Walt 1
General Manager, Technical Functions Trojan Nuclear _ Plant 71760 Columbia River Highway Rainier, Oregon 97048 Mr. Lloyd K. Marbet 19142 S.E. Bakers Ferry Road l
Boring, Oregon' 97009 Mr. Jerry Wilson i
Do It Yourself Committee 570 N.E. 53rd Hillsboro, Oregon _ 97124
'l Mr. Eugene Rosolie
._ Northwest Environmental Advocates
.j 302 Haseltine Building' 133 S.W. 2nd Avenue Portland, Oregon 97204 l
5 b
{
t l
l a:
Mr. James E. Cross May 18,1993 i
as described in Section 4 of NUREG/CR-0649. A detailed explanation of how this date was determined is to be included.
' i 2.
Information that will demonstrate that due to site-specific considerations, and supporting analyses, the possibility of a cladding fire in the spent fuel pool is sufficiently ' eyond a design o
basis accident to not warrant requiring any continuing offsite emergency preparedness.
3.
An evaluation of those offsite preparedness measures which may not be required even if a cladding fire is postulated because of the time available after water loss in the pool and before a fire could be initiated.
Until the staff acts on both the request for an exemption to the regulations l
and the request for approval of the permanently defueled emergency plan, PGE must continue to meet regulatory requirements in 10 CFR 50.54 (q) regarding emergency preparedness.
Due to the complexity of this review it is possible that the staff will be unable to complete the review by the date you have requested. However, I can assure you that all available staff resources -are being utilized to resolve this issue in a timely manner.
The staff under-stands that some of the contracts for offsite emergency response services will expire during the month of June 1993.
PGE should make arrangements to extend these contracts should the review of the relief requests extend past the current expiration date of the contracts.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than 10 respondents, therefore,-OMB clearance is not required under P.L.96-511.
Sincerely, s
Original signed by:
Michael T. Masnik, Senior Project Manager Non-Power Reactors and Decommissioning Project Directorate Division of Operating Reactor Support
.I Office of Nuclear Reactor Regulation cc: See next page f
Db' ONDD:PMM ON OGC DRSS:D M otm f FJCongel V i
li on MMasnik:mkm RDudley SWe[iss 05///93 05/f/93
.05/f/93 05/
93 05/ /93 05/p/93 90 :D Ng 1
D
$K rimes 05/(,/93 DOCUMENT NAME: B:\\TROEPLET
'l l
i j
A Mr. James E. Cross '
DISTRIBUTION:
Docket File 50-344 PDR r
JPartlow BKGrimes SWeiss JKopeck, OPA RWood EHylton MMasnik OGC DHagan GHill (2)
HSmith WJones CGrimes
.}
ACRS (10)
OPA OC/LFDCB WLamb, ILPB Region V IDinitz, ILPB DORS R/F ONDD R/F RDudley DNash, ILPB LBell k
l s