ML20136C355
| ML20136C355 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Crane  |
| Issue date: | 10/05/1977 |
| From: | Lauer J BABCOCK & WILCOX CO. |
| To: | Domeck C TOLEDO EDISON CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 7909190476 | |
| Download: ML20136C355 (117) | |
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TELEC0PY Power cenernum crean
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ECOX biTD P.O. Dox : sD. Lyn:hNrr., Vc, as;,
Wem:= A E5m October 5, 1977 Bili-1578 File:
T1.2/12B J. D. Len@on
'llr, C. C. Domech cc:
nacicar Project Encineer J. C. Leg g ix ToledoEdisonComsnv Po.eer Engineering r.n'd Construction D.J.Demro E. C. Ilovah/2 330 Madison Avenue Toledo, Ohio 43552 Toledo Edison Company 24, 1977 DEPRE55UR12ATION EVE li 0F SEPTEMBER
Subject:
Davis-Besse Unit 1 B&W Reference USS-14 i
Dear Mr. Domeck:
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DMI is reviewing the available data regarding the transient on the even 2300 psig September 24 in which the reactor coolant pressuredropped from to about 950 psig in 7.5 ninutes.
period im.ediately thereaf ter c there was apparently some steam form d the reactor reactor coolant system, one steam generator second if. / -
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h ure This transient does not appear to have caused any excessive stress diose boundary of the reactor coolant or secondary system becaus l
We conditions to confirm that stress levels are within ASME to the design transients.
upon the determine whether this transient has any effe:: diate con:crn.
calculated fatigue life of the components, but this would be of no ime
,...,q-are also evaluating to
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d cavitation The reactor coolant pu.ps were exposed 'to condi None be operated
' of these things appear to have happened and we feel that the pu-ps may We suggest a series of with only minor risk of additional damage to the pumps.
h isk of pryr;isjve start-unel;s under close observation in order to minimiz This is not considered to be a safety concern.
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furthering cny latent damages.
has Based upon our evaluation of the transient conditionsT we do not fe L~ teu m:
s
- However, been any viciation of fuel integrity which would preclude safe startup.
we have made no evaluation regarding effect upon fuel life.
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In sumary, BM! considers that there has been no degradation of s As an economic con:crn,we urge progressive and it may be operated as designed.
startup of the RC pumps under close observation.
Please advise if you need further advice.
Very truly yours A. H. Lazar,denior Project Manager t Q c L[] p/
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