ML17331A516
| ML17331A516 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/10/1980 |
| From: | Hunter R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.E.1.2, TASK-TM AEP:NRC:0307E, AEP:NRC:307E, NUDOCS 8012180312 | |
| Download: ML17331A516 (6) | |
Text
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rduR:6012180312 DuC ~ DATE: A0/1O/la lOTAR[ZEO:
NO FACTL:50-315 Oona l o C. Coors'uc l ear Power Vlant r Uni t 1 r Indiana 50-316
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vuclear Fower Plantr Unit 2r Indiana AUTth.jvAi~'E AUTHJR ArFILIAJ IQrv'U>JTE R g r~ ~ S ~
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HAEC Ir'Ie,Nl'F F ILI ATIO,"v OFvTOr'r4,PE
, Office of r4uclear Peactor Regulationr Director OOCKET 050 05000316
SUBJECT:
Provides adal info re automatic initiation i flow indication for auxiliary feeuwater sys.Flow indicators fed from oalance of plant inverter uninterruptable power source fed from Cd "atter y of Unit 1
IZ Ab battery of Unit 2 ~
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INDIANA II MICHIGAN ELECTRIC COMPANY P. O.
BOX 18 BOWI.ING GREEN STATION NEW YORK, N. Y. 10004 P
< ~
cs fTI December 10, 19N)
AEP:NRC:0307E Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
Docket Nos.
50-315 and 50-316 License Nos.
DPR-58 and DPR-74 Auxiliary Feedwater System Automatic Initiation and Flow Indication Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.
S. Nuclear Regulatory Commission Washington, D.
C.
20555
Dear MI. Denton:
The attachment to this letter contains our responses to the request for additional information contained in Mr. S.A. Varga's letter of October 31, 1980 concerning the automatic initiation and flow indication for the auxiliary feedwater systems in the Cook Plant and are applicable to both Units 1 and 2.
Very truly yours, R.
S. Hunter Vice President cc:
R.
C. Callen G. Charnoff John E.
Dolan R.
W. Jurgensen D.
V. Shaller - Br idgman NRC Region III Resident Inspector at Cook Plant - Bridgman goo/
/i
ATTACHMENT TO AEP:NRC:0307E These responses are in the same format as the enclosure to Hr. S.
A. Varga's October 31, 1980 letter.
Response
To Item 1:
The operating bypasses associated with the automatic initiation logic are as follows:
A.
Turbine Driven Auxiliar Feedwater Pum TDAFP):
There are no bypasses in the TDAFP logic which prevent automatic initiation.
B.
Motor Driven Auxiliar'eedwater Pum s
f1DAFP):
C.
Tiie HDAFP's are automatically started by:
low-low steam generator water level in any oil~ of the four steam generators, undervoltage of RCP bus (2/4 logic),
any safety injection actuation signal derived from:
a.
pressurizer pressure
- low, b.
differential pressure between steam lines - high, steam flow in two steam lines - high concident with either 'Tavg-low-low or coincident with steam line pressure-low (Unit 1 only),
ii.
steam line pressure
- low (Unit 2 only),
d.
containment pressure
- high, and e.
manual iv) v)
blackout safeguards sequence (either Unit) loss of main feedwater pumps
I 2
There are two (2) bypasses in the MDAFP automatic initiation logic:
1.,
The P-ll interlock in the Reactor Protection System (RPS) logic is used to allow the manual block of the safety injection actuation signal generated from pressurizer pressure-low.
This interlock is reset automatically when pressurizer pressure goes above 1915 psig for Unit 1 and 2010 psig for Unit 2.
2.
The P-12 interlock in the RPS logic is used to allow the manual block of the safety injection actuation signal generated from; (a) steam flow in two steam lines-high coincident with steam line pressure-low, in Unit 1 and (b) steam line pressure-low, in Unit 2.
This interlock (both Units) is reset automatically when primary system temperature is above the Tavg-low-low setpoints of 541oF.
The remaining signals which generate a safety injection actuation (which in turn automatically initiates the MDAFP starting) and the other automatic MDAFP start signals iis eJ above do not have bypasses in the auxil;ary feedwater initiation logic.
Res onse To Item 2:
The auxiliary feedwater flow indicators, FFI-210, FFI-220, FFI-230 and FFI-240 are fed from the balance-of-p'lant inverter in each unit (non-class Ic).
This is an uninterruptable power source which is fed from the CD battery of Un'.t 1 and the AB battery of Unit 2 (safety related station battery).
One instrument channel per steam generator is provided'.
The flow indication instruments are located on Panel SG in the main control room ard on th appropriate hot shutdown panel for each unit.
Also, each pump has a
discharge pressure indicator in the control room, FPI-244, FPI-253, FPI-254.
The pressure indicators are powered from the same source as the flow in-dicators (FFI's).
Operability of this power source (BOP inverter) is required by the Technical Specifications.
Res onse To Item 3:
The steam generator level measurement systems are all supplied from the vital instrument buses which are Class IE uninterruptable power sources.
There are 4 independent vital instrument
- buses, Channels 1, 2, 3
and 4.
bel ow:
The level instrumentation for the Steam Generators is tabulated A.
Steam Generator No.
1 BLP-110, Channel 4 Indicator BLP-'ill, Channel 2 Indicator-Recorder
BLP-112, Channel 3 Indicator BLI-110*, Channel 4 Indicator-Recorder B.
Steam Generator No.
2 BLP-120, "hannel 4 Indicator BLP-121, Channel 1 Indicator-Recorder BLP-122, Channel 3 Indicator BLI-120*, Channel 4 Indicator-Recorder C.
Steam Generator No.
3 BLP-130, Channel 4 Indicator BLP-131, Channel 1 Indicator-Recorder BLP-132, Channel 3 Indicator BLI-130* Channel 4 Indicator-Recorder 0.
Steam Generator No.
4 BLP-140, Channe',
4 Indicator BLP-141, Channel 2 Indicator-Recorder BLP-142, Channel 3 Indicator BLI-140*, Channel 4 Indicato) -Recorder
- Mide Range Level Indicator All of the indicator and recorder elements have 0'Arsonval move-ments which obtain their energy from the transducer system and require no further energy to drive the indicating devices.
The chart motors of the recorders, which are not required for recorder pen indication, are fed from non-safety grade balance-of-plant control buses.
All of the BLP's have a narrow range of 144" and begin to in-dicate at 431" water (75.1'>> of wide range).
All of the BLI's have a wide range of 575" water.