ML20024B454
| ML20024B454 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/16/1978 |
| From: | Dunn B, Nirodh Shah BABCOCK & WILCOX CO. |
| To: | Taylor J BABCOCK & WILCOX CO. |
| References | |
| TASK-06, TASK-6, TASK-GB GPU-2527, NUDOCS 8307080777 | |
| Download: ML20024B454 (2) | |
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,l (pg gq J. H. TAYLOR, lit ACER, LICENSING IfC3
- 3. M. DUN:;, tiV:ACER, ICCS N;ALYSIS UNIT N. H. S}'.AH, ICCS ANALYSIS ses 443.s t
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File No.
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Date POTINTIAL SAFErf CONCERN NOVEMBER 16, 1978 8
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Af ter discussing a question of the Potential Safety Concern filed against
.y 205 plants in regard to the secondary side auxiliary feedvater control level, we have reached the conclusion that the concern should be now rescinded.
i The change to a positive six-foot level control was cade in the i
I su=er of 1977. ECCS was consulted and gave tentative approval, pending analysis confirmation, as se that time, we believed it was probably acceptable".
The results of the confir:ation were that ECCS was wrong about the accepta-i bility of the six-foot control. At present, we are engaged in studies to decide whether to return to a forty-foot level control or to upgrade an alter-nate system to compensate for the six-foot level.
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NPC-1707-01 defines a significant deficiency ass, f
"DEFINITICN OF SICNIFICM T DETICIENCT
. Deficiencies to be reported in accordance with this procedure are 8
those deficiencies found in the design, canufacture, fabrication, f
installation, construction, testing and inspection which, were they.
to have re=sined uncorrected, could have adversely affected the i
safe operation of the plant at any ti=e throughout the expected I
life-ti=e of the plant.
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'In addition to the above, the deficiency must also be the result of one or more of the following:
i a.
A significant breakdown in any portion of the quality r
asrurance program; b.
A significant deficiency in final designs approved and released for construction; A sigaificant deficiency in the construction of,# or signi-c.
ficant da= age to, a structure, system or cec:ponent requiring corrective action involving extensive effort; d.
A significant deviation from performance specifications requiring corrective action involving. extensive effort."
Tor this problem, Item b applies. ECCS now considers that the design could not have been " fins 1" as we had recognized check work to perform. Therefore, even though e.sny steps tovsrd a six-foot. level control had been tsken, at least one, our forms 1 and finsi spprovs1 remained.
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. FC I!TIIAL SAFErl CONCE.tl - PACE 2 - NOVE::m ER 16, 1978 In considerstion of this lack of finslity of design, the fact that we have followed a logiesi and timely path toward finsi design, and that the iden-tifiestion of the probles with six-foot control vss not inadvertent, but part of a pisnned ef fort, we request that the Potential Safety Concern of Aptil 4, 1978 be withdrawn.
BC/dw ll!/lf77 cc:
E. A. L'or.ack Signature:
Datet
- 1. C. Jones N. H. Shah E. R. King Y h /. / p M ate:
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e s Ro o Cartin Signature:
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Bert M. D0nn, ::anager, ECCS Analysis Unit d
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