ML13310B144
| ML13310B144 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/09/1984 |
| From: | Medford M Southern California Edison Co |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8401180254 | |
| Download: ML13310B144 (3) | |
Text
Southern California Edison Company P. 0.
BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD.
CALIFORNIA 91770 M.O. MEDFORD TELEPHONE MANAGER. NUCLEAR LICENSING January 9, 1984 (213) 572-1749 Director, Office of Nuclear Reactor Regulation Attention: Mr. D. G. Eisenhut, Director Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
Subject:
Docket Nos. 50-206, 50-361 and 50-362 Emergency Operations Facility (EOF) Ventilation System San Onofre Nuclear Generating Station Units 1, 2 and 3
References:
Ventilation System, Docket Nos. 50-206, 50-361 and 50-362, July 22, 1983
- 2. Letter, K. P. Baskin, SCE, to D. M. Crutchfield, NRC, Docket 50-206, Emergency Response Facilities, December 7, 1982 Reference 1 reported the results of our review of the EOF ventilation system design in response to inquiries by members of the NRC staff. Based on the review, we determined that modifications to the EOF ventilation system were necessary to assure the required isolation function.
We stated that the modifications would be completed by December 31, 1983 and that we had identified a potential problem with air leakage from EOF equipment rooms such as the diesel generator room. This letter provides you with the current status of the EOF ventilation system modifications and provides the actions necessary to address the in-leakage.
As indicated in the referenced letter, the modifications which were completed prior to December 31, 1983, involved the installation of isolation dampers on the HVAC penetrations into the EOF. This included dampers on the penetrations for the EOF HVAC, on the exhaust duct work for the EOF HVAC, and on the exhaust ductwork for the EOF chemistry laboratory. We also gasketed the EOF isolation envelope doorways. After the completion of these modifications, operational testing was performed to determine the in-leakage into the EOF isolation envelope. The results of this test indicate that under the following conditions the in-leakage is negligible (i.e. for calculation purposes leakage is zero): (1) the newly installed isolation dampers are closed, (2) the fresh air makeup.fans are shutdown, (3) the internal recirculation fans are shutdown, and (4) all doors into the EOF isolation envelope are closed. We can maintain isolation of the EOF for a period of 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />, based upon the current emergency response staff occupancy of approximately 100 persons.
8401180254 840109 PDR ADOCK 05000206\\
F PDR
Mr. 0.
January 9, 1984 Based on calculations assuming the above described mode of EOF HVAC operation, the EOF protection factor for the Emergency Support & Organization personnel is approximately six in the chemistry laboratory area and greater than six in the coordination center area. The protection factor of six exceeds that which is required by NUREG-0737, Supplement 1. The protection factor is lower than the value reported to you in Reference 2 due to the affect of the outside air volume taken into the EOF HVAC chiller room, which is in the corner of the building, directly over the chemistry laboratory.
Currently, the EOF HVAC is set up by its control logic to isolate with the new isolation dampers and shutdown the fresh air makeup fans, but the internal recirculation fans continue to run because under normal circumstances that would be the desirable configuration. However, since these fans cause a negative pressure in the EOF HVAC equipment room, they will be manually shutdown when the EOF is isolated. We will modify the control logic to meet items 1, 2 and 3 above with a single control, by the February 29, 1984 annual emergency exercise. Procedures to implement the above discussed mode of operation are being prepared and will also be implemented prior to the annual emergency exercise scheduled for February 29., 1984.
In order to aid in your understanding of the configuration of the EOF at San Onofre Nuclear Generating Station, provided as Enclosure 1 is a plan view of the San Onofre Nuclear Generating Station Training and Education Center. This structure houses the EOF, which is indicated by the shaded area of Enclosure 1. The equipment rooms that are discussed above are on a second floor doghouse over the chemistry laboratory and security office area.
The doghouse is entered by the stairs shown next to the security office.
If you have any questions regarding the above discussed information, please let me know.
Very truly yours, Enclosure cc: D. M. Crutchfield, Chief, Operating Reactors Branch No. 5 G. W. Knighton, Chief, Licensing Branch No. 3 H. Rood, NRC Project Manager, San Onofre Units 2 and 3 A. E. Chaffee, San Onofre Resident Inspector
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