ML20024B459

Top Ten Issues Stemming from Tmi

ML20024B459
Person / Time
Site:	Crane
Issue date:	06/11/1979
From:	Taylor J BABCOCK & WILCOX CO.
To:
References
TASK-06, TASK-6, TASK-GB GPU-0260, GPU-260, NUDOCS 8307080782
Download: ML20024B459 (3)

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Top Ten Issues Ste.mine From TMI 'hy.' 'Jfu

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Communication' (If, h,[a, h,-

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'At the top of the list of mitigativ'e/ recovery actions is,;2 '.

d, 5-Improved communications. Action is needed immediately te

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develop recommendations based upon BT.h' experience during 4'?-

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the T)tI-2 incident..

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.Snen Break / Transient Analrse s,

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The spectrum must be fully evaluated Isr s11 expect.ed c bi-bi 2

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' nations of events ar.d operator actions.

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,'j ' '.f be darelopment of imp.;oved operatir.g proced.2res.

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OperatinF Procedures, especisily off-nertal procedares must have L.

a a clearly defined basts; definition of.assaptions, analytical W

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,mpport, etc.

These bases must be firm and "real)stic" vs 9

0 "conservatave". Interdisciplinary review is required to assure

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Operator Training Building upon the further definition of transient behavior under realistic conditions and development of'added 'or revised operating s

procedures, suppleoentary training is in order. " Additional

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. steps must-be tsken to assure transfer' of additionguseful in-

..d. formation from the system desig sr'and system analy'st t N.e

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This informstion must obviously be available and familisr to those persons instructing \\the operators.

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Assimilation of Infornation and Control by the Operator d

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e A review should'be performed to determine the,need for inprove,

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f.- ments in presenting information for more easily and accurately Z.,

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'. diagnosing cff normal situations and for controlling the

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nseessary equip. cat.

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• piereeney Ortani:ation and Responsibility p

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,A.s 3 result of the experie.~.ce gained with TMI ~ w shou 11 take D

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e specific ste,;s to structure an organization and def.ine respapri-J

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bilities for dealing with a similar occurtence in the future

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P' This should include specific designation of centact points within f

Ist and each utility organization, designation of an area for l,

centrali;Irt activity, and defieition of'hardline communication k

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Feedba_:1r of 0 wrntins Exper t ene;

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Caertting experience couains mu'ch useful information which I

i she,uid be e'v'Alvated for beth obvious and subtle safuty i:.pli-c,a ti on s. In g(ner.a1 any perturbation directly affecting the.s

-c primary or seccadary systein should be' evaluated with the objective 7

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In many instances the of. eliminating as many as possible.

review'of transients and system perturbations will have an i

,.a railability benefit.

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Redefinition of Safety Instrunentstion --- ~.

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Review is'nc6ded to identify upgrading of instrunentation.which, F-r-

prior ::o ntI-2, was not considered safety grade but which 7

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' played a vital role in tW4 long term ' post acc'ident stifety of.

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This involves.lecation review, water tightn. css, 9

9 cable ruati::g, po,ver supply., reduadancy, etc.

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fy' Heat Removal System Desten

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'Dicry best renovat sys.tems have bJ en dep,gned previotisly.~fe r low pressur. 'operitian< Small treaks f a tle primary or '-

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'secosdi'f 'sp1;.en' nAd e xcessive. tadio.ctivity were not conside.rr3 L

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'*in 1% des'ag.3 c: thes's syst' ens and 4 rc'viiw 'is in order.

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M4piiate-tren relating-to sit :h things as ICS design, NEh* system

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~Dii~need foriiPs cea..ttability Ir.proirenent ' program should. be. '

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