ML20202H729
| ML20202H729 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 03/28/1996 |
| From: | Berlinger C NRC (Affiliation Not Assigned) |
| To: | Mckee P NRC (Affiliation Not Assigned) |
| Shared Package | |
| ML20202H700 | List: |
| References | |
| TAC-M93652, NUDOCS 9712100348 | |
| Download: ML20202H729 (1) | |
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A UNITED STATES Ij NUCLEAR REGULATORY COMMISSION
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WASMGTON, D.C. 30006 4001
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Mm:h 28,1996 MEMORANDUM T0:
Philip F. McKee, Project Director l
Project Directorate 11-3 Division of Reactor Projects - East FROM:
Carl H. Berlinger, Chiaf Containment Systems and Severe Accident Branch Division of Systems Safety and Analysis
SUBJECT:
MILLSTONE 2 SAFE 3Y EVALUATION - ENCLOSURE BUILDING FAILURE VULNERABILITIES (TAC M93652) i Millstone Unit 2 Inspection Report 50-336/95-25 identifics as an OPEN ITEM:
The determination as to whether the EBFS was originally required to meet single failure criteria remains unresolved pending MRC review of the LER supplea'ent iCRI 336/95-25-03).*
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By Work Request dated September 20, 1995, Guy Vissing requested an SCSB review. The Work Request statad:
Please review enclosed (LER 94-040-02 as it relates to the potential design deficiency in the Enc)losure Building Purge Systen wherein in the event of a single facility or component failure, a release path from the Enclosure Building would allow for a direct discharge to the atmosphere without charcoal filtration following a LOCA if Enclosure building Purging operations were being perfarned.
The licensee has presented its position and action.
Please review the licensee *s position and action for acceptability and provide an SE that supports your determination. This is an open issue in the inspection status and your determination will suppcrt the closure of this ins')ection issue.
Please note that the review does not include the issue related to the hyd ngen analyzer cabinet and sample hood exhaust fan that was found to take suction on the Enclosure building and discharge out the Unit 2 Main Exhaust Stack without charcoal flitration.
Bv memorandum dated February 12, 1996, we provided a Safety Evalur. tion which concluded that the remaining single failure deficiency should tm corrected.
We hava since reconsidered that recomendation in terms of backfit benefits It is cur revised position that the potential safety benefits do not warrant a design t N.
This reconsidcration is based on credit given for proper implementation of plant procedures to ensure manual termination of vent the low probability of multiple coincidental events in the acciden
-An evaluation is attached.
If you need further information, please contact 4
W. Long (415-3026).
i Docket No. 50-336
Attachment:
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