ML20198G567
| ML20198G567 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 07/29/1976 |
| From: | Benaroya V Office of Nuclear Reactor Regulation |
| To: | Long C Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1128 NUDOCS 8605290670 | |
| Download: ML20198G567 (2) | |
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APCSB Reading ilote to Charles Long. Technical Assistant for Plant Systers, USS i
REVIE'l 0F TECil.'!ICAL ASSISTA"CE RE0tlEST - REVIEU POST-CP PROPcSEP NAS!!I:1GTC;l PC'OLIC P0"ER SUPPLY SYSTEH, U: LITS 1 S 4 (UPPSS 1 & 4) "00IFICATIO,13 l
TO DESIGi (TAR-3916)
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In accordance with Technical Assistance Request 3916 the auxiliary and Tower Conversion Systers Branch has revicued the post-CP modifications to j
the design for the l'ashincton Public Fa':cr Supply System, finits 1 a 4 (UPPSS 1 f. 41. Enclosed are our carents, positions and requests for additional infomation to he addrnssed when tha 9plicant submits the desicn r.cdification in ar fnendrent.
I' lease incorporate our coments with those of other Plcnt Systens branches.
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The rofifications to design described in the Attachnents to t*1e '.*PSS lettar to 'fr. John Stolz, dated Anril 23, 1976, that arc within our scope t
of review are:
(1) Attachment A:_ Seismic Desten and Safety Classificatic.n of the Ccenonant_
_Cuoline Water Systen (cr!.r.)_
i The Applicant has pronosed to separate the CCi'S into a safety related seisr.ic Category I, Quality Grcun C subsystan an.1 a non-safety related, non-scistic Category I, quality Group D subsysten, "revir>usly the entire CCUS was designed to seismic Catoqcry I, quality Croup C requi rocents. 'le concur with the Applicant proposal to split the CC'!
syste i; however, we will require the Applicsnt to mcet ti.e positicns set forth in the enclosure regarding cooling water to the reactor coolant pumps.
(2) Attachnent F2: Piae Drnak Desien Criteria The Applicant has propcsed to design for pipe br9aks cutside contain:ent in accordance with Branch Technical Positions APCSS 3-1 and FCC 3-1.
Previously they used the Giebusso criteria and the C' Leary uitoria to the extent practicable. Ne concur with the Applicant's arpreacht however, i
we 9111 require the AF'd systen to be classified as high encroy if it operates during startup, shutdo"m or het standby.
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2-(3) ettnch:mnt 0: "oisric Decicn of Crar.o,s, l
The applicant had previously specified that the containcant polar crane, cask handling crane, and new fuel htndling crane uould be desir:ned to prevent en uncontrolled lowering of their inad in the event of a safe shutdovm carthquake. The Applicant has perforred an i
analysis to show that the drop of any cisne supported Icad will not frpair the safe shutdown capability of the plant and keep the.
potential doses to a snall fraction of 10 CFP.100 licits. On this basis, they have proposed the crancs need not be designed to prevent the uncontrolled lowerin'g of their loads in the event of a safe shutt'orm egrthquake (SSE). The cranes will be designed to rerain structurally intact and to generate no nissiles during an SSE. He need additional infomatico regarding the crent fuel cask travel path to comlete our evaluation. The Mechanical Engincerino 3 ranch is reviewine taa analysis of the reactor vessel head drop ont'o the reactor vnsscl.
'lso, ST.9 has recuested additional infonr,sticn for this analysis.
i Victor Concroyao Chief Auxillcry end Po<cr i
Conversion Systems 3 ranch Division of Systers Tafety i
Enclosure:
As Stated cc:
P. lfatthews O. Fischer J. Glynn
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