ML19319C225
| ML19319C225 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Davis Besse  |
| Issue date: | 12/21/1976 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 175, NUDOCS 8002060789 | |
| Download: ML19319C225 (4) | |
Text
_.
NRCFoRM 195 UA NUCLEAR REcuLAToRY COMMISSION DOCKET NUM BE R 50-346 in 7e>
'"""I'"
NR,0 DISTRIBUTION FoR PART 50 DOCKET MATERIAL
'O:
i FROM:
DATE OF DCCUMENT Toledo Edison Compsny 12/21/76 Mr. John F. Stolz Toledo, Ohio DATE. R E CEIV E D Mr. Lowell E. Roe 12/27/76 WLETTE R ONOToRIZED PROP INPUT FORM NUMBER OF CCPIES RECEtVED SoRiolN AL
%UNC LASSIFIE D b-OCoPy One signed DEScalPTION ENCLOSU R E phh AcGOT Ltr. re our 10/1/76 ltr. and their 11/3/76 ltr....concerning degraded grid voltage Condition.
@p.}.*5QT F I@[3 Z
a (2-P)
PLANT NAME:
Davis-Besse SAFETY FOR ACTION /INFORMATION vmrTon 12/29/76 RJL ASSIGNED AD:
AR9TNMRn An*
XBRANCH CHTEFt Stolz
[g)
RPANrm rmTvv.
YPROJECT MANAGER; Engle PROJECT MANAGER:
l MLIC. ASST. :
Hylton LIC. ASST. :
i l
LN INTERNAL OlSTRIBUTICN i
MN FILE "
SYSTEMS SAFETY PLANT SYS M S SITE SAFETY &
MNRC PDR HEINEMAN TEDESCO ENVIRO ANALYSTS YI&E
/A)
SCHROEDER BENAROYA DENTON & MIT TIR X OELD T.ATNAR MGOSSICK & STAFF ENGINEERING M
IPPOLITO ENVIRO TECH.
I MIPC MACARRY ltTRICIDOD ERNST i
CASE KNIGHT BALLARD i
HANAUER SIHWEIL i OPERATING REACTORS SPANGLER i
HARLESS PAULICKI STELLO i
SITE TECH.
PROJECT MANAGEMENT REACTOR SAFETY OPERATING TECH.
CAMMILL BOYD ROSS X
EISENHUr STEPP P. COLLINS NOVAK V
SHA0 HULMAN HOUSTON ROSZTOCZY Y
BAER PETERSON CHECK V
BITrLER [3]
SITE ANALYSIS MELTZ V CRIMES VOLLMER HELTEMES AT & I BUNCH t
SKOVHOLT SALTZMAN X J. COLLINS RUTBERG KREGER EXTERNAL DISTRIBUTION CONTROL NUMBER MlPDR: Pt. Clinton. Ohio NAT. LAB:
BROOKHAVEN NAT. TAM.
XTIC:
YNSIC:
LA PDR g7 M r,g "
'ASLB:.
CONSULTA!frS: s /
/
/.
X)CRS /d> CYS 45GisH NG/BE>T.* /# #. //>/19 /2C}
Q l
4 t
< p
/
N7.c poRM ins (2 7e gozoeo787 4-
y TOLEDO EDISON
..q'WW
\\
El gCy '
LOWELL E. ROE December 21, 1976
- * **"* at
\\
3 d
Fecmt.es Devescoment Ept' dh 14191 259-5242 Serial No. 175 2h
.if /
.a gu Docket No. 50-346 f
J$'
'i
/'b.
,7
~*
Mr. John F. Stolz b' !) ~
Chief Light Water Reactors Branch No. 1 :31 vision of Project Management United States Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Stolz:
Your letter to us dated October 1, 1976, described equipment failures during a degraded grid voltage condition at Millstone, Unit 2.
Our letter to you dated November 3, 1976, partially gave the results of an investigation of degraded grid voltage at Davis-Besse No. 1.
We are now transmitting the remainder of our response.
Item 4 i
Provide a description of any proposed actions or modifications to your facility based on the results of the analyses performed in response to Items 1-3 above.
Response
The following modifications are to be made to the facility based on the results of the analyses performed in reponse to Items 1-3:
1.0 The existing setting of 59*.' of rated bus voltage given in response to Item Ic will be lowered to a 30% setting with a time delay of 1/2 second.
2.
Additional undervoltage relays will be added with a setting of 70% in a 1 second time delay.
3.
Additional undervoltage relays will be added with a setting of 90% in a 10 second time delay.
T 8 ;.D THE TCLECO ECISCN COMPANY ECISCN PLAZA 300 MACISCN AVENUE TOLEDO. CHIO 43652
i
.s These modifications are made to protect against degraded grid voltage conditions such as those which occurred at Millstone, Unit 2.
Very truly yours, dh a/12
)
i i
4 1
1 4
i J,
4 A
i E
t i
s i
e i
a I
DISTRIBUTION FOR FIRE PROTECTION EVALUATION LETTERS DEC 17 1976 DATED:
roup 1 Docket File (See Docket Nos. 50-368, Arkansas 2; and 50-477, Atlantic for enclosures)
NRC PDR Local PDR Branch File Branch Chief LPM LA Grouc 2 R. Boyd R. DeYoung L. Crocker D. Vassal 1o F. Wil1iams H. Smith J. Miller R. Heineman R. Tedesco V. Benaroya T. Ippolito EID I&E (7)
K. Goller A. Rosenthal, ASLAB J. Yore, ASLSP bec: NSIC TIC ACRS (16)