ML16340B655
| ML16340B655 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 04/16/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Furbush M PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8104270158 | |
| Download: ML16340B655 (14) | |
Text
Q
'R Docket Nos.:
50-275/323 APR 16 198 CO
/g f/fr. Malcolm H. Furbush Yice President - General Counsel Pacific Gas 8 Electric Company P. 0.
Box 7442 San Francisco, California 94106
Dear Hr. Furbush:
2 ')
14UE12Aa 'R1G 0
EO1A141SSEE
!N i'd.
SUBJECT:
CONTROL SYSTEM FAILURES - DIABLO CANYON NUCLEAR POllER PLANT, UNITS 1
AND 2 The analyses reported in Chapter 15 of the FSAR are intended to demonstrate the adequacy of safety systems in mit,igating anticipated operational occurrences and accidents.
Based on the conservative assumptions made in defining these "design bases" events and the detailed review of the analyses by the staff, it is likely that they adequa4'ely bound the consequences of single control system failures.
"I To provide assurance that the design basis event analyses adequately bound other more fundamental credible failures,you are requested to provide the information delineated. in the. enclosure
@lthin 30 days of receipt of this letter.
Sincerely, Robert L. Tedesco, Assistant
, 'for Licensing Division of Licensing 1
Director cc:
See next page.
Enclosure:
As st~ted DISTRIBUTION:
SEE NEXT PAGE.
8 x04ppo t5F, OFF<CEf/
SURNAME/
DATEP
- B¹3 I:jb 4/1 81 DL BCBuckley 4/)$/81 NRC FORM 318 IID/801 NRCM 0240 DL'N
a""'/g 81
~ (
~ ~ ~ ~ ~
~ ~ y
~ ~
DL:A 4~/81'FFICIAL RECORD COPY
~ ~
~
~ ~ \\
~ ~ ~ I ~ ~ ~ ~ ~ ~ ~
~
~ ~ ~ ~ ~
~ ~ ~i(
~ ~
~ ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~
~ ~ ~ ~
~
/1 USGPO: 1989-329 824
r
,/
V j~ e jig
'I; (
lt J~
n
DISTRIBUTION:
Docket.File 50-275/323 LPDR PDR NSIC TERA LB/f3 Files DEisenhut RPurple SHanauer
'TMurley RMattson RVollmer BBuckley JLee TNovak GLainas JKnight DMuller PCheck WKreger LRubenstein FSchroeder MErnst FMiragli a ASchwencer BJYoungblood EAdensam JRMi 1 ler RHartfield, MPA KKniel OELD IE (3)
BGrimes ACRS
(,16)
ApR 16 1981 OFFICE)
SURNAME/
DATEP
~ ~ I
~ ~ ~
~ ~ ~ ~
~
~ ~ ~ ~ ~
~
NRC FORM 3)8 IID/80) NRCM 0240
~ Tl~ '
~ ~ ~ ~ ~ ~ ~ ~
~
~ ~ ~ ~ ~ ~
i'
~
~ ~ ~ ~ ~ ~ ~
OFF I CIA L ECOR D COPY,
- USGPO: I98~29 824
li 5
'I'>
~
~
'P
~
lgp j~
N
)i
S 4~00
~ ~gw
+
0
~~afl V/
0
<<**++
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHIMGTOM,D. C. 20555 gp ts
<9@
Docket, Nos.:
50-275/323 Mr. Malcolm H. Furbush Vice Pres ident - General Counsel Pacific Gas
& Electric Company P. 0.
Box 7442 San Francisco, California 94106
Dear Mr. Furbush:
SUBJECT:
CONTROL SYSTEM FAILURES - DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1
AND 2 The, analyses reported in Chapter 15 of the FSAR are intended to demonstrate the adequacy of safety systems in mitigating anticipated operational occurrences and accidents.
Based on the conservative assumptions made in defining these "design bases" events and the detailed review of the analyses by the staff, it is likely that they adequately bound the consequences of single control system failures.
To provide assurance that the design basis event analyses adequately bound other more fundamental credible failures, you are requested to provide the information delineated in the enclosure within 30 days.of receipt of this letter.
Sincerely, cc:
See next page.
Enclosure:
As stated Rober t L. Tedesco, Assistant Director for Licensing Division of Licensing
4
<<7ce V)
!c:1, II...sh
~.esi.,nt
.~.~eral Counsel
<c "
=- f I lec:ric Co"iipany
- ,cx 7-'
2 r~.nci "o, California 94106 A
"-if'." G~s h Electric Co;,pany
~.0.. ox 7442 Franci sco, Cal i forni a 94)06
. '.c: E. 'err, Esq.
'~ if, -ni a 7"
v') i c bti 1 iti e s Co-.,:>i s s i on 3 !:il 1 i ster S greet San Francisco, California 94102
!;r. Frederic): Eissler, President Scenic Shoreline Preservation Conference, Inc.
4623 I'ore I'esa Drive Santa
- Barbara, Cali fornia 93105 I!s. Elizabeth f pfelberg 1415 Cozadero San Luis Obispo, California 93401
!Ir. Gordon A. Silver
!'s; Sandra A. Silver 1760 Alisal Street San Luis Obispo, California 93401 Harry tl. Willis, Esq.
Seyt,-our 6 I,'illis 601 California Street, Suite 2100 San Francisco, Cali fornia 94108 hr. Richard Hubbard hHB Technical Associates Suite K
1723 I/amilton Avenue San Jose, Ca'lifornia 95125 f!r. John Ilarrs, I!anaging Editor San Luis Obispo County Telegram-Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406
0 4
I ii
" -.ide t:,>sI -ct,or/Diablo Canyon t.PS c, cry CG..:,15s, Gn v
<,"= ~~
~
~
v ~ vox Di6
~.rrc;o grande, California 93420
.s..",a:
Fl e;; ng t'e l 'ad 11 c~,
=- 1 iforn i a 93 c0
~
r I
l 11,.5) t.sg.
~
CA 4
1 v'1
~
~
~., s)>)'Is ~~gn, f sq.
'",.:1:",~."nolds, Esq.
"=-.iter for Law in the Public Interest l ~?"3 S=" ta fionica Boulevard L.s i, -.;les, C lifornla 90067 l
"-aul C. Valentine Esq.
'.21 Lytton ~venue Palo I'ilto, California 94302
~yron S
~
C..( rgl ov Le".a 1 Affairs Secretary Governor's Office State Capitol Sacrar;,ento, California 95814 Iierbert I(. Sroi"n Esq.
i i 1 I, Christopher 8 Phillips, P.C.
1900 ii Street, N.W.
4'ashington, D.C.
20036 ter. Richard E. Blankenburg, Co-Publisher t;r. ';,'ayne A. Soroyan, lieu:s Reporter South County Publishing Company P. 0.
8ox 460 Arroyo Grande, California 93420 l:r. Jar:,.s 0. Schuyler Vice President
- tJuclear Generation Department Pacific Gas 8 Electric Company P.O.
Box 7442 San Francisco, California 94106 Bruce I/orton, Esq.
Suite 202 3216 l!orth 3rd Street
- Phoenix, Arizona 85012
E 1
F
.r. "..
C. ".'n."-."off
',,austin.h:;use Flectric Corpora.ion
~ II
~
~
Q%
~%4
)
> i,'c>: ~ul >f') Pennsyl vc"rila 15230
> ic.ael
'. ~ Klein, Esq.
l.ilr,.er, Cutler f Pickeriig
.; nir.-;:r, D.
C.
2( GG6
=so
~
vid ".
)
) -)isc(<a):el
)
1725 a..':riet, V.
);as'ii)..',
u ~
C ~
dv).) '3 Califo~ niia Department of Health
~Tie,'.
Ct.icf, Environmental Radiation
'..n'carol Unit "d.'olo-'. I':.;al h Section
/l)l P Street -
Roor)> 498 Sacra.;=n.o, California 95814
'Director
':~)ei gy Fa" i
~ i ties Si ti..9 Diivi s ion Energy Resources Conservation and Devel opii nt Cor;mi s s ion 1111 Hoi'e Avenue Sacramento, California 95825 Energy ",csourccs Conservation and De; lo
"..: nt Cor ))ission ATTt):
Librarian 1111 Hoive Avenue Sacram nto, California 95825 President California Pqblic Utilities Commssion California State Building 350 fwcA11ister Street San Francisco, California 94102 Director, Criitcl'la ar)d
.".n(..".rds Division Office of Padiation Pro",r='..s (P.'R-460)
U, S ~ Envi t oui)iental Pi Gt t i( n A:"ncy l(ashington, 0.
C.
204CO
~4 t
ENCLOSURE RE(VEST FOR ADDITIONAL INFORMATION (1)
Identify those control systems whose failure or malfunction could seriously impact plant safety.
(2)
Indicate which, if any, of the control systems. identified in (1) receive power from common power sources.,
The power sources considered should include all power sources whose failure or malfunction could lead to failure or malfunction of more than one control system and should extend to the effects of cascading power losses due to the failure of higher level distribution panels and'oad centers.
(3)
Indicate which, if any, of the control systems identified in (1) receive input signals from, common sensors.
The sensors considered should include, but should not necessarily be limited to, common hydraulic headers or impulse lines feeding pressure, temperature, level or other signals to two or more control systems.
(4)
Provide justification that any simultaneous malfunctions of the control systems identified in (2) and (3) resulting from failures or mal-functions of the applicable common power source or sensor are bounded by the analyses in Chapter 15 and would not require action or response beyond the capability o$ operators or'afety systems.
~'
t<<
lI
'I