ML20043A603
| ML20043A603 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 05/09/1990 |
| From: | Keuter D SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Larkins J NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20043A604 | List: |
| References | |
| AGM-NUC-90-103, NUDOCS 9005220299 | |
| Download: ML20043A603 (2) | |
Text
y, f'
(*T Q*
,e f~Q J
)SMUD:.
'"b SACRAMENTO MUNICIPAL UTluTY DISTRICT C 6201 S Street, P.o. Box 15830, Sacramento CA 95852-1830 (916) 452 3211' AN ELECTRIC SYSTEM SEF'VING THE HEART OF CALIFORNIAi y
1
'AGM/NUC 90-103
- May 09, 1990 K
U. S. Nucleat' Regulatory Commission
. Attn:: - Document Control Desk
~Hashington, DC 20555 l Docket No. 50-312 Rancho,Seco. Nuclear Generating ~ Station License No. DPR-54.
ENVIRONMENTAL QUALIFICATION' UPDATE Attention: -John Larkins j
- The-purpose of this letter is to provide you with an update on the current
= status ofithe-Environmental-Qualification -(EQ) program at Rancho Seco Nuclear j
w
- i: ~
- Generating Station.
t
' Pursuant to.the provisions of 10 CFR 50.49(a), the~ District established a 1
. comprehensive program for qualifying electrical equipment immrtant to 1
safety.
The program is described in Rancho Seco Administrative Procedure si RSAP-0313; Equipment covered by-the program. includes both safety related and non-safety related equipment that is relied upon to remain functional during
-the design basis events to ensure:
The integrity of the Reactor Coolant System,.
J, The. capability to shut down the reactor and maintain it in a safe shutdown condition,-and
- L Th; capability to prevent or mitigate the consequences of accidents that~.could-result in potential offsite exposures comparable to the 10 CFR 100 guidelines.
As: recognized by the NRC in its letter of January 18, 1990, from Dr. Thomas E.
1 Hurley to Mr.. David A. Boggs:
1.-
Rancho Seco is' defueled with all fuel in the spent fuel pool building.
2.-
The District does not intend to resume power operations at Rancho
.Seco.
4
'I I +,
900522O299 900509
\\
\\V
.PDR ADOCK 05000312-i P.:
. PDC
.8
'li.g RANCHO SECC NUCLEAR GENERATING STATION D 14,440 Twin Cities Road. Herald, CA 95638 97L9; (209) 333-2935 e
m lcr
- . c p
John Larkins AGM/NUC 90-103
-3.
Design basis accidents for a nuclear facility in a defueled condition are~all associated with loss of fuel pool. water inventory or with fuel. handling.
As a result, with the exception of the Auxiliary Steam System (used for heating and radwaste processing) plant energy sources capable of producing harsh environments have been de-energized.
In addition, our evaluation has concluded that a line break in the Auxiliary Steam System cannot cdversly affect our ability to maintain Spent Fuel Pool cooling water level and temperature.
Further analyses have concluded that in our present mode, no postulated event can result in offsite exposures comparable to 10 CFR 100 guidelines.
Based on the above, the District has modified its EQ program to suit present plant conditions.. He have issued a new implementing procedure (which included a 10 CFR 50.59 determination), Technical Services Administrative Procedure TSAP-4400 (attached).
In general, TSAP-4400 allows the deferral of EQ related preventive maintenance tasks, and the use of non-EQ parts in what were previously deemed to be EQ application.
-Specific elements included in TSAP-4400 include:
Recognition that the program described in RSAP-0313 has been inactivated, Technical justification for the inactivation of RSAP-0313, The process by which EQ-related preventive maintanance tasks can be deferred, documented, and tracked, and The process by which EQ parts can be replaced by non-EQ parts, a
documented, and tracked.
He consider these actions to be prudent. Our EQ program has merely been modified to suit plant conditions.
Plant configuration is being maintained and no irreversible action has been or will be taken until such time es the NRC grants. specific relief or authorized decommissioning.
Members of your staff with questions requiring additional information or clarification may contact Jerry Delezenski at (209) 333-2935, extension 4914.
~
Sincerely, Dan R. Keuter Assistant General Manager Nuclear Attachment cc w/atch:
J. B. Hartin, NRC, Halnut Creek A. D' Angelo, NRC, Rancho Seco
,