ML19319C477
| ML19319C477 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/28/1975 |
| From: | Ferrel C Office of Nuclear Reactor Regulation |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002190927 | |
| Download: ML19319C477 (2) | |
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Central Files 50-346 007 e e g73 a / Reading File AAB/ Reading File Harold R. Denton, Assistant Director for Site Safety, TR THRU: Brian K. Grises, Chief, Accident Analysis Branch, TR ICETI!iO WITH BECHTEL PERSO NEL REGADING THE DAVIS-BF.SSE U'iIT 1 SFCT FI'2L TOOL CERGENCY VOTILATION SYSTC{
P2RSONS PRESENT: See Attached Sheet Representatives c,f Bechtel met with NRC staff members for the previously scheduled meeting at 9:15 on October 15, 1975 in B. Gri=es' office to discuss sodifications in the spent fuel pool ventilation system. The discussion centered around 3echtel drawing numbers M-410, M-020A, M-411 and M-029A showing the auxiliary building and the contain=ent and pene-tratien rooms (copies on file in AAB). The current ventilation system requires manual isolation of the spent fuel building and initiation of blowers for the charcoal filter system after the centrol room cperator hears an alara.
Various possible changes to the system to meet our position on autonatid actuation vere discussed (including changes to ductwork, changes in logic and addition of radiation detectors and da=pers), to introve the systen with respect to the fuel handling accident without significantly <' evading the ability of the systen to cope with a LOCA.
As a sid light of the meeting, the following problen was identified. It
.sppears frou drawing nunber M-410 that the radiation detector shova near the fuel handling air exhaust (HIPA) filter number 724 is too close to the air pressure activated isolation valves on both inlet and outlet to this filter to prevent the escape of contaminated air from a fuel handling accident.
- 3. Grices stated that radiation detectors (ionization chambers) would have to be located far enough upstream of the isolation dampors to ensure closure of these danpers before activity was released.
Charles Ferrell, Site Analyst Accident Analysis Branch Division of Technical Review cc:
B. Grimes OO P. Atherton 9
g A. Ungaro QQ A. Szukiewicz L. Engla O.D 9
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AtT0".'. TIC ISOD/CIO: OF 5?r FM. POOL "aU CaINC Persons Present P. Atherton TR E. J. Ray Bechtel Charles Ferrell AAB A. R. Ungaro APCSB T. R. Quay Bechtel B. Grimes TR/AAB
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