ML20148C226
| ML20148C226 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 01/22/1980 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Ahearne J, Gilinsky V, Kennedy R NRC COMMISSION (OCM) |
| Shared Package | |
| ML20148C221 | List: |
| References | |
| NUDOCS 8001310288 | |
| Download: ML20148C226 (4) | |
Text
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MEMORANDUM TOR: Chairman thearne
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il 0 lik Co'rnissioner Gilinsty Comissioner Kennedy Comissioner Hendrie Comissioner Bradford THRU:
E).ecutive Director for Operations FROM:
Harold R. Denton, Dire'c' tor, NRR
$U3 JECT:
DETERMINATION WHETHER PM DESIGNED PLMils PRESENTLY UNDER CONSTRUCTION EE ALLOKED TO CONTINUE In a memorandum of October 25, 1979, 1 inforced the Comission of in intentien to request holders of construction permits with B&W designs under construction for information tc allow us to detemine whether it is necessary to halt con-struction of these B&W plents pending conpletion of our reliability study of EM plants. Based on preliminary infomation on the status of plant construction and design changes already made, we had decided that construction of these plants should be pemitted to continue pending evaluetion of plant-specific infomation, q
Letters were sent to: Washington Public Pomr Supply System (WNP-1 and WP-4h Tennessee Valley Authority (BNP-1 and DNP-2); Constrsers Power Company (Midland Plant, Units I and ?); and Virginia Electric Poer Company (North Anna 3 and 4).
We have received responses from all of these utilities, kner, Virginia Electric powr Cogeny (North Anna 3 and 4) informed us that they would not be responding to the detailed requests of our letter.since engineering'and construction activities on the site have been stopped. They are undertaling a fessibility study for utilizing the existing, equiptient in the design and construction of coal units.
A summery of equipment installation status and dates of syster completfon, together with pertinent renarts are shown in the encloture. The systen and ccaponents shom mate up the salient features of the nuclear sten s'gply system external to the reactor vessel. As indicated by the entlosure, the equipment installation for both units of the Bellefonte f acility and both units of the Midland facility are essentially complete. For both of these f acilities, the large piping systems are installed or well underway with installation of small-diameter piping valves and supports sorenet behini, i
Some aspe;ts of electrical and instrumentation installation have not yet been ccepleted, and control systens installation varies from ID", to 7%
compl et e.
Howver, components of these systems are readily accessible af ter installation to changes and additions without major configuration modifications. Therefore, we conclude that halting construction of the 8001310 N
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5 Bellefonte and Midland units wou1 not provide sigreificantly greater fley.ibility to implerent later design changes, if reauired, to cocponents and systems than if construction were to proceed to completion. he h ruption to construction activities, loss of continuity, and loss of stilled work force wpuld inpose severe additional penalties to the cost of such design changes (hfiich would be about the same whether changes were made non or af ter completion of the plant).
for WNP-1 and 4, while design, procurement, and shop f abrication of all t
eo,uignent is ccnplete, only a few of the items are installed end for l
most, the system installation has not yet begun or has barely started.
j for WNP-4, installation of these items will not be initiated until June, 1980 at the earliest. Consecuently, continuing construction and installation, of the systems for WNP 4 has no ef fect on the flexibility to irplement changes until at least kne,1980.
For WNP-1, er. cept f or the control system and core flood tani., some of the equipent has already been installed but systen installation (piping, valves, hangars, supports, instroentation, and electrical) has only begun and none will be completed until July 1931.
The reactor coolara control system will not be started until Septenber 1981, and the core flood tants until February,19fD at the earliest. Major eccess openings will be raintained for et least another 10 ronths.
Thus, the status of all these plents is such that only for WNP-1 would cor,tirmed construction significantly affect the cost of inplementing. changes in ca.ict items of equip:ent now or after system installation. Heer, rejer access openings for WNP-1 will not be closed until September 1960 at the earliest, af ter which time significantly increased costs to replace such cajor co ponents will accrue. Therefore, halting construction of KlP-1 at this time depends on the Linds of design thanges.litely to be required, All of thne plants already interporate or will incorporate design changes to reduce the sensitivity aspect of B&W designs, such as the eddition of anticipatory trips from abnormal' conditions in either the feedkater or steam flow paths of the steam generator; iaprovenents in control system hardware; additional safety-grade Class lE auxiliary feed water control system; initiation of auxiliary feedwater by Class IE system; and aedition of feed only good generator (FOGG) system.
To date we have not identified a recuirenent for changes in large components that would require removal and replacement. It oppms unlikely that such changes will be required. tbwever, it is likely that further changes nay be required ir sone aspects of control systems, instrunentation set-p 5nts, s
level indicators, valve and actuator configurations and line-up, changes in (or additional) small dia eter piping and instreent, elettritet, end tir lines, and other such changes not reouiring major co ponent replace:ent.
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.~Jh Cors.issioners JM 2 21939 I
Ke have discussed,hese plants with the ACRS and are sr.heduling further i
discussions with the ACRS in March,1980.
Presently, we are pursuing both the rist assessrent study by our Office of Research as indicated by our D:teber 25, 1979 letter and our own evaluation of the onte-through-steam generator in conjunction with recomendations fro a %t ACRS. We are projecting our analyses and evaluations to be concluded by April, 1980. For those plants where installation is essentiaHy tts-plete, halting construction. achieves no appreciable benefit and for those plants wbtre installation has not begun or barely started, our assessrent will be concluded prict to appreciable change fn installation str.tus, i
The nature of the changes likely to be required are such that additional construction will not rLal.e these foreseeable changes infeasible nor prejudice any health and safety decisions. With respect to KNP-1, k'ashington Public Pomr Supply System has initieted at our recuest, a rist assessment study since our preliminary Crystal River indications are that these analyses-are highly cependent on balance-of-plant dt signs, %e apNicibi F@2%
that these analyses will tale approxit.ately six renths. We will nonitor the progress of this study and the applicant has corraitted to submit the results prior to the closure of any r:ajor component access to the containment. We conclude that construction of KNP-1 should also be permitted to continue since we can identify no compelling need for raajor changes and continued construction would not f oreclose the feasi-oility of chenge which might ultimately be instituted.
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Harold R. Denton, Director Office of Nutlear Reactor Regela ion i
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Enclosure:
As stated 4
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