ML20209E268

Forwards Allegations 1505 & 1506 Per 850305 Request. Allegations Assigned Applicability Code E

ML20209E268
Person / Time
Site:	Diablo Canyon
Issue date:	04/04/1985
From:	Cleary D Office of Nuclear Reactor Regulation
To:	Knighton G Office of Nuclear Reactor Regulation
Shared Package
ML17083B484	List: ML20209C687 ML20209C692 ML20209C725 ML20209C729 ML20209C734 ML20209C742 ML20209C774 ML20209C779 ML20209C786 ML20209C810 ML20209C853 ML20209C869 ML20209D170 ML20209D204 ML20209D416 ML20209D421 ML20209D450 ML20209D560 ML20209D649 ML20209D703 ML20209D864 ML20209D903 ML20209E021 ML20209E030 ML20209E037 ML20209E052 ML20209E145 ML20209E211 ML20209E268 ML20209E506 ML20209F952 ML20209G177 ML20210E664 ML20210E745 ML20210E799 ML20210E811 ML20210E916
References
FOIA-86-197 NUDOCS 8504180045
Download: ML20209E268 (2)

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Docket Nos: 50-275 '

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MEMORANDUM FOR: George W. Knighton, Chief '

Licensing Branch No. 3 Division of Licensing FROM: Donald P. Cleary, Acting Chief Site Analysis Brarich Division of Engineering

SUBJECT:

DIABLO CANYON ALLEGATIONS 1E0E and 1506 Attached, as requested by your memorandum of March 5, 198S, is the completed form (Enclosure 3.) For Allegations 1505 and 1506, we have assigned applicability Code "E" to both of these allegations.

Donald P. Cleary, Acting Chief r Site Analysis Branch Division of Engineering

Enclosures:

As stated cc: WVJohnston l

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/ DIABLO CANYON ALLEGATIONS Task: 1505 + 1506 CODE "E"

,t' ATS No: RV 84A114 BN No: NONE Characterization Allegations 1505 and 1506 are concerned with the safety of 8 one ton cylinders of chlorine stored on-site. The safety concerns are with respect to sabotage and storm driven wave damage. The allegations are stated to be threats to Raactor Safety as well as to residents living downwind of the Diablo Canyon facility.

Implied Significance to Plant Design, Construction, or Operation The Diablo Canyon Reactor Control Room Habitability System is designed to detect chlorine gas and isolate the ventilation ~ system. Detection and iso-lation provides interim protection so that the control room operators can don emergency breathing apparatus. Hence, the control room operators are suffi-ciently protected for conducting a safe shutdown of the facility. Other employees on-site would need to evacuate, as has been done at other reactor facilities as well as chemical plants when chlorine is accidentally released.

Assessment of Safety Significance The Diablo Canyon control room is designed to protect the operators in event of chlorine leakage. Hence, the presence and potential release of the on-site chlorine is not a significant hazard with respect to the safety of the plant.

SAB, will, however need to evaluate the consequences of the postulated chlorine spill on residents who live downwind of the site.

Staff Position .

The Staff considers that the Diablo Canyon Control Room Cperators are protected adequately against the effects of a release of the on-site chlorine. With respect to off-site residents, the staff believes that the chlorine hazard is not significant. However, the basis for this assessment has not been formally documented. The Staff intends to evaluate the off-site concentrations of a chlorine spill at resident locations downwind.

Action Required SAB will estimate the extent of a chlorine release with respect to the off-site residents. Another division will need to address the question of sabotage.

EHEB will provide an assessment of the consequences of a potential chlorine release on the off-site residents.

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