ML20147D117
| ML20147D117 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/29/1988 |
| From: | De Agazio A Office of Nuclear Reactor Regulation |
| To: | Shelton D TOLEDO EDISON CO. |
| References | |
| NUDOCS 8803030238 | |
| Download: ML20147D117 (5) | |
Text
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February 29, 1988 Docket No. 50-346
)ISTRIBUTLON:.
Serial No. D8-88-009 iTecset rv es_. NRC & Local PDRs PDIII-3'r/f ~ KPerkins GHolahan PKreutzer ADeAgazio OGC-WF1 Mr. Donald C. Shelton EJordan JPartlow Vice President - Nuclear ACRS(10)
PDIII-3 Gray File Toledo Edison Company Edison Plaza - Stop 712 300 Madison Avenue Toledo, Ohio 43652
Dear Mr. Shelton:
SUBJECT:
NON-VITAL POWER SUPPLY IN VALVE INTERLOCK LOGIC Attached is a letter which Westinghouse Electric Corporation sent to its customers regarding a valve interlock logic used in some of its plants. Our Instrumentation and Control System Branch has reviewed this problem, and believes that the subject problem could possible exist at the Davis-Besse Nuclear Power Station also.
Please review this information for applicability at Davis-Besse.
Sincerely,
/
/b Albert W. De Aga io, Project Manager Project Directorate III-3 Division of Reactor Projects - III, IV, Y and Special Projects
Enclosure:
As stated cc:
See next page LA/kIII-3 PM/PDII -
PD/P I Office:
Surname:'gKreutzer ADeAgaz d g KPe ins l
Date:
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hartsv111a, south Carolina 29550 Dear Wr Norgant sin erch.
a Carolina Power & Light Company.
N. 5. Robinson Unit.2.
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N Operating Plant Feedbt.sk
'Non vital Power.
$ woo)y Used in Valve Interlock looic'
.6 The'puspose of this letter it to make you aware of a safet
.at an operating plant which has similar design features to y
\\
y concern identified The potential problem involves the capability to establish p recirculation flow.
Pleast refer to the attac,hed sketch.
T accidents, a flow path from the containment sump through th During certain Ramoval/ Low Head Safety Injection (RHR/
injection (HMSly pumos.is required.
eat To esta nums, to the High Head Safety or 5 eiust be opened.
p.3 However pressure transmittern A and B., respectively. Thi inte lvalves A and 8 ar N
feature such that these valves cannot be opened when the RMR$
r ock lo above about 2M psig to 250 psig.
insure that vahes A and I remain closed during noren) interlock logic is The in, tent of this pressure is operation.
pressure piping in the suctlen of the HMS;J and C r of overpressurialng the lower
- RHRS coolcown d
For the operating khe situation resulted in the pote I
ump s.
- 4 non vital power.
could be blocked from opening if the non vital power failed sva 1
a. whets valves A and B valve were powered from separate emergency power.
ough the It is re:tmanded that you review the current interlock logic an arrangements for the subject valves and instrumentation to insu of non vital power still allows both valves to be opened.
ower for the single failure of emergeTe~f power to preclude on It is acceptable ure cpeneQ.
e valve from being y
.h f
I FR0r. REG.2-ATLANTA 12/Ous? 13:00 P.
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FEB 2 41988 Neverber 3, 1987 Page t If remote valve operation cannot be assured be sede to allow continued plant operation., These include byppss'ng these interlock logic or manual operation of the valves using the handwheel.
L(onger-term solutions include changing power supplies Note:
interlock logi,c.
Should you have any questions, please contact me.
Sincerely,
('.*'.;
M b..P ~.g m
G. O. Percival Carolina Area. Project Manager C
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Mr.' Donald C. Shelton Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. 1 h
CC' Donald H. Hauser, Esq.
The Cleveland Electric Radiological Health Program Illuminating Company Ohio Department of Health P. O. Box 5000 1224 Kinnear Road Cleveland, Ohio 44101 Columbus, Ohio 43212 Mr. Robert W. Schrauder Attorney General Manager, Nuclear Licensing Departrent of Attorney Toledo Edison Company General Edison Plaza 30 East Broad Street 300 Madison Avenue Columbus, Ohio 43215 Toledo, Ohio 43652 Mr. James W. Harris Director Gerald Charnoff, Esq.
(AddresseeOnly)
Shaw, Pittman, Potts Division of Power Generation and Trowbridge Ohio Department of Industrial Relations 2300 N Street N.W.
2323 West 5th Avenue Washington. 0.C. 20037 P. O. Box 825 Columbus, Ohio 43216 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Ohio Environmental Protection Agency 799 Roosevelt Road 361 East Broad Street Glen Ellyn, Illinois Columbus, Ohio 43266-0558 i
President. Board of Mr. Robert B. Borsum County Commissioners of Babcock & Wilcox Ottawa County Nuclear Power Generation Division Port Clinton, Ohio 43452 Suite 525, 1700 Rockville Pike Rockville, Maryland 20852 State of Ohio Public Utilities Commission Resident Inspector 180 East Broad Street U.S. Nuclear Regulatory Commission Columbus, Ohio 43266-0573 5503 N. State Route 2 Oak Harbor, Ohio 43449 4
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