ML20037A605
| ML20037A605 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 09/15/1977 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Crooks J NRC OFFICE OF MANAGEMENT AND PROGRAM ANALYSIS (MPA) |
| Shared Package | |
| ML20037A606 | List: |
| References | |
| NUDOCS 8003160311 | |
| Download: ML20037A605 (2) | |
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MEMORKiD:I4 FOR:
J. L.LCrooks, Chief, Perfomance Evaluation Oranch,
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Operations Evaluation Divisi.on, OMPIC,.
FROM:
6.~ G. Eisenhut. Assistant ~ Director for Operaticnall
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Technology, Divis~ ion 'of Operating Reactors, ONRR-
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SUBJECT:
PROPOSED ABNOPJiAI. OCCURRENCE - BOROH DILUTION INCIDENT AT CRYSTAL RIVER UNIT NO. 3 Ycur July 12, 1977 ccmorandun requested our assesscent as to whether or not tne suoject event involved 'a 'cidfop' reduction in the protection 2-of the public boalth or safety.'
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A cocy of our technical evaluaticn of this event is anciosed. As '.;e nave dhcussed c:ith you previously, Sjded,cn 't!.a results of this etaluation we have deten::hed t.N.a.t.:..
a.
Durine tha subject event, only a limited accunt of Inch was iniecwi in:c tne primry ccolant syster: and the rn cter re-ained subcMtical by a larde 6.argin.
b.
In order for nn event of this tyra of result in an accidtr. tai recctor criticality, a series of very conservative assumotions
' including the assuntion that'ho operator action vculd be taken in sufficient time to toiminate the event) would have.
to be nde in conjunction.with a postulated sir:gle failure of the isolation valve for the M60H tank. 'We have detemined that the assumption that opera' tor action would not be taken.
in sufficient tire to teminat'e the ~ event prior to reactor
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criticality is overly conservative ~due 'to the alarms and indication available to the oriepatdi'and%e to the Llength' of, time available. for operatorfa.cff.6n'.'T % '
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-HRR to send. letters to PWR 11cdsesas'ifncj'them to investigate the potential!for!a similar boren ~difuticd'incidedt at their facilities. J v
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