ML20028C423
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14 DEC 1977; Oocket No. 50-245
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-. 7 Northeast Nuclear Energy Compairy 3.
ATTEt. Mr.' D. C.. Switzer President i
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P O. Box 270 Hari.74, Counscticut 06101 D
Gentlemmar
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This refers to the trimphone conversation between Mr. E. McCabe and Mr.
~4 A. Davis of this effice and Mr E. Ferland of your staff on December 14, i
Igni regarding the detonaticas of combustible gases in the Millstone Point Statico, Unit 1, Offges System and. Stack n====gt on n=e==d=r 13,
. i, 19U With regard to the matters-disdussed, we understand that you have under-
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taken or_ will undertake the foi, lowing actions:
Revise the say=are of events; determine safety significance and a
define specific measures ta prevent mcurrence;
-b Consider the need for additional instrumentation to detect com-1,j bestible orexplosive gaseous mixtures in enclosed spaces, and for plant equipment to remove or diluta such mixtures; I
l c.
Review the adequacy of p. Mal and management contmis for prirvesting and responding to events of this nature, including but 4
not liettad to the actions taken in this case to review the initial explosino and to assure proper pertiornmoca of w...i.ive actions j
such as refilling loop sealsj t
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Identify and correct insthematation, equipment, piping, and structural damage resulting fitas the explosions; and,
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e Report, in writing, to this office, the results of your evaluations I
and the completion of corrective actionr necessary to minimize the l
potential for disrt.ptive explosicos.
c Further, we understand that you will limit Unit l's operation to less
.,y them.or equal to 4 percent rated power until your cormctive actions have been reviewed and accepted by this office. If our understanding of 8301100100 021207 ll./h[
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14 DEC 1977 liertheast Nuclear Energy Company 2
your planned actions as described above is no't in accordance with the actual plant and actions being implemented, please contact this office insediately Sfncorely.
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Boyce H. Grier
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E J. Forland, Plant Superintendent D. G Diedrick. Manager of Quality Assurance A. I. Raisman., Counsel for Citizens Coomdttee i
for the Protection of the Environment t
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bec's:
IE Mail & FiTes (For Appropriate Distribution)
Central Files Public Document Room (PDR) local Public Document Room (LPDR)
Nuclear Safety Infonnation Center (NSIC)
Technical Information Center (TIC)
REG:.L Reading Room State of Connecticut G. L. Snyder
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Lana Cobb, IE:HQ
.t W. P. Ellis, IE:HQ l
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DAftte Desm NRC 318 (7.75) NRCM 0240 o u e. eevennuaw, ene.m=e screes. tre me.ee
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