ML19322C391
| ML19322C391 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 06/09/1978 |
| From: | Streeter J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Woodruff R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160927 | |
| Download: ML19322C391 (2) | |
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NUCLEAR REGULATORY COMMISSION
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CLC*e C LLvas. ILLINCIS 63137
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R. *w'. Woodruff, Acting Assistan: Direc::: f: Technical programs, Divisics of Reac:c: Cperations inspectica, II
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iDavis-3 esse Unit.1_=sy no cenply with this CDC 17 recuirenen during a 1:ss
< :o"h*F2 f or review.
this design =atter be forwarded; of lead condi-icn, and (2);:oT. recc.=end tha:
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T he Davis-3 esse FSAR contains the f cileving sta:ecents rela:ed to the au:c-a ic fas: ::ansf er of sta:icn auxiliary pcVer f c the nain genera::: :o cf fsi:e sources folleving less of no:-.al (nain genera c ) pcver:
(a) Appendix 3D, page 3D-15, las: paragraph "...In the event -he =ain genera:c uni: is lost, s:ation auxiliaries will be ::ansf erred aute=atically by fast hus ::ansfer sche =es to :he offsi:e pover..."
(b)
Sectica 8. 3.1.1, page 3-6, second pa:agraph "...Tae systen vill have a fas: transf er to the reserve pcVer source icile.ing a turbine
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.w Tnese FSAR state =ents appea: to 1:dicate tha: :he fas: bus ::a.sfer at:ica is e..<-,-s--
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M In addition, the f olleving TSAR s:atenent indicates :ha: the a=ergency diesel genera ces will not be called upen to supply the auxiliary pcuer unless bcth the =ain generator and off si:e power are les :
Appendix 3D, page 3D-15, second paragraph "...Upen icss of :he nor:al and reserve (of f site) power sources, the two 4160 vel: essential buses
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s are energized f:c: their respective e:e:gency diesel-generaters.
af[In the. event !:he plan: experiences a less of lead (an:icipated operational occurrence as described in FSAR See:ica 15.2.7) due :o :he :ain genera:::
345 K7 ru:put breakers cpening, the plan: is designed :c run back :o if 7.
pcue and =aintain sta: ion auxiliary 1: ads en :he sain genera:::.
RIII has deter ined that if a LOCA cecurs when the plant is in this c:nditien the a:ergency diesel generators veuld be i==ediately called upen :: supp,
auxiliary p ver vi:hou: the fas: ::ansfer circuit atte=p ing te ch:ain auxili-2:y pcVer f c: :he preferred (cffsite) scurce.
This is due :c the design cf
- he f as: ::ansf er circuit which requires :he 345 K7 breakers :: have been closed t=:ediately pric: :: he less cf the :ain genera:::.
This is the area where the plan: =ay ne: ::: ply with the CDC require:en:.
The licensee's pesi:icn and basis of fas: ::ansfer design is that any even c:her :han generator f aul:s which vculd cause cpening cf :he genera::: cu:pu:
3reakers vould also resul: in less of all ef fsi:e power sources; therefere, having aut natic ::ansfe
- o :his unavailable s:ur:e veuld no: =ake any sense.
Unde: gen era::: fault condizions :he cu:put breakers _ open and auxiliary leads are _i==e' ia:ely ::ansf erred Oc cif site p:ver.
The licensee b"elievesj~he'c:5-d r{pliesf.:halliequiremen:sofGDCf171 RIII unders: ands f:c: recent discussi:ns vi:h NRR :ha: Davis-3 esse was judged
- o cenicr= :o GDC 17 bef ore OL issuance based en the above mentiened FSAR s:a:e=ents whiih appear to indicate that (1) the fas: ::ansf er sche:e is uncondi:icnal, and (2) the energency diesel genera:::s are ne called upen :o
, supply _ auxiliary _ pever unless all c:her.pever. sources have been les:.
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[this lis act ;'he casa... SKR =ay: not~ find the des'ign a'eceptable:
RIII re:: -
= ends this =atter be forwarded te NRR fo: : view.
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