ML18046A942
| ML18046A942 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/23/1981 |
| From: | Vincent R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-06-07.C1, TASK-6-7.C1, TASK-RR NUDOCS 8110010160 | |
| Download: ML18046A942 (15) | |
Text
consume11 Power company General Offices: 212 West Michigan Avenue, Jackson, Ml 49201 * (617) 788-0650 September 23, 1981 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - SEP TOPIC VI-7.C.l, INDEPENDENCE OF REDUNDANT ONSITE POWER SOURCES By letter dated November 18, 1980, the NRC issued for comment a draft evalua-tion of SEP Topic VI-7.C.l for the Palisades Plant.
Attached are the Consumers Power Company comments on that document.
Robert A Vincent Staff Licensing Engineer CC Director, Region III, USNRC NRC Resident Inspector - Palisades
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Corrections PALISADES PLANT - SEP TOPIC VI-7.C.l COMMENTS ON NRC EVALUATION
- 1.
Sect V.A, first paragraph:
Diesel Generator 1-1 supplies 2400 voit bus lC, station power transformer 11, 480 volt bus 11 and 480 volt Mcc~1.
D/G 1-2 supplies 2400 volt. bus lD, station power transformer 12, 480 volt bus 12 and 480 volt MCC-2.
See drawing E-1 attached.
- 2.
Sect V.A, second paragraph:
Both chargers are not normally connected to each DC bus.
Plant procedure SOP-30 (item 6.7) states that the battery chargers should be operated as pairs; i.e. either chargers 1 and 2 or cha,.rgers 3 and 4 should be used during normal operation.
T!).is pairing results in one charger operating on each DC bus, and diverse power supplies to each operating charger.
- 3.
Sect V.A, second paragraph:
Charger 2 is powered from MCC-2.
See drawing E-1 attached.
- 4.
Sect V.A, fourth paragraph:
The YOl transfer switch can be operated manu-ally as well as automatically.
In addition, as discussed in CPCo letter of August 17, 1981 (Comment 48) in response to Topic VII-3, sufficient instruments exist independent of bus YOl to allow taki>>g the plant to a safe shutdown condition.
The only instruments necessary are pressurizer level, pressurizer pressure, steam generator level and PCS temperature.
These instruments are avail-able from the redundant preferred AC busses.
- 5.
Sect V.B, Item 3:
Control circuitry exists for the 480 volt tie breakers 52-1118 and 52-1217 to auto trip these breakers upon either of the two conditions specified below.
(These conditions are shown in drawing E-17-2.)
- 1)
- 2)
A tie breaker auto trip will occur whenever an under-voltage condition exists at the secondary of startup transformer #1-2 coincident with a reactor or turbine trip, and prior to the closure ofthe d.iesel generator output breaker.
A tie breaker* auto. trip will occur whenever an*under...:voltage condition exists 6ri 2400 volt bus lC or lD and the associated diesel generator output breaker is* open.
It should be noted that an under-voltage condition on bus lC opens tie breaker 52-1118 and an under-voltage condition on bus lD opens tie breaker 52-1217.
- 6.
Sect V.B, Item 5:
As discussed above in correction 2, only one charger is normally connected to each DC bus.
The charger input and output break-ers can only be manually operated.
There are no provisions for auto-matic control of these breakers.
Upon loss of off-site power, the chargers which were in service prior to the power loss will again power the DC bus upon restoration of power from the diesel genera-tors.
The chargers that were not connected in service prior to the power loss remain out of service when on-site power becomes available.
- 7.
Sect V. B, Item 5:
The statement that the battery chargers are undersized is incorrect.
The chargers were adequately sized for the station batteries which were originally installed in the plant, and are still adequate for the new batteries which are being installed during the current refueling outage.
The following discussion pertains to the plant configuration which will exist after the current refueling outage, and should be considered an update of the staff evaluation.
2 The two new station batteries each have a nominal capacity of approxi-mately 1800 A-H.
The steady state DC loads will be approximately 86 amps on DC bus No 1 and 84 amps on bus No 2.
These values include presently known loads which are being added by planned modifications, and apply to both normal and post-accident conditions.
Each of the two battery Chargers available for each DC bus has a rated
.output of 200 amps.
The single charger which is normally supplying each DC bus, therefore, has sufficient capacity to c~rry bus load as well as charge the battery at a rate of approximately 115 amps.
To facilitate CPCo design of the new batteries, a* 1oad study was performed to conservatively predict the required battery capacity for a post-acci-dent condition involving a loss of off-site power.
This study predicted that 523 A-H would be consumed by loads on DC bus No 1 and 666 A-H on DC bus No 2 over the two hour period following the off-site poweT loss. If the chargers remain available, they would supply 400 A-H to each bus over the two-hour period (200A capacity X 2 hrs).
The total* battery discharge, therefore," would only be approximate).y 123 A-H for station batt.ery No 1 and 266 A-H for battery No 2.
The batteries could clearly be recharged rapidly in this post-accident condition with the available capacity of the single charger on each bus.
If the chargers remained unavailable throughout the post accident period, the new batteries have the capacity to carry DC loads for a substantial period of time beyond the first two.
hours until an off-site or on-site AC power source can be restored.. The new station batteries have a capacity more than twice than that of the original batteries, and are obviously very conservatively sized.
It must also be noted that the dual charger configuration at Palisades offers a degree of redundancy and increased reliability over the confi-guration normally found at current plants.
In a situation in whi.ch off-site power is lost and a diesel generator is not available, the redundant charger powered from the operable diesei can be used to carry DC loads and charge the battery in the opposite division.
The probability that a DC bus will be lost in this situation is therefore greatly reduced.
Palisades DC bus reliability would be expected to be greater than that offered by the more typical current design practice utilizing.single chargers on each DC bus.
The above information is directly pertinent to the GDC-17 considerations which were discussed in SEP Topic VII-3 (NRC letter of January 24, 1981),
and should also be considered in the continuing staff review of that.
issue.
3
- 8.
Sect V.B, Item 7:
The bypass regulator output breakers are interlocked to preclude supplying.more than one preferred AC bus at a time.
The inter-lock scheme has a key lock on each output breaker.
The four breaker locks utilize a single key which is maintained by the Shift Supervisor.
- The key must be inserted in the desired breaker locking device before that breaker can be closed, and with a breaker closed, the key cannot be removed.
Therefore only one breaker can be closed at a time.
RESPONSES TO DEVIATIONS, SECT VI Deviation 1.
Deviation 2; Deviation 3.
Deviation 4.
Deviation 5.
As discussed in"CPCo letter dated August 17, 1981, the only indications deemed necessary for achieving a safe shutdown condition are pressurizer level, PCS pressure, PCS tempera-ture and steam generator levels.
These indications are available from the redund.ant preferred AC busses which are independent of bus YOl.
For convenience a tabulation of the available *redundant instruments and their power supplies is attached.
The 120 VAC instrument bus YOl is certainly desirable, but it is not required.
By letter dated March 3, 1981, CPCo.agreed to submit a Technical Specification change to limit conditions in which busses 11 and l~ could be tied together.
This deviation does not exist at Palisades.
See the dis-cussion above in Correction 5.
This deviation does not exist at Palisades.
See the dis-cussion above in Correction 6.
This deviation does not exist at Palisades.
See the dis-cussion above in Correction 8.
Deviations 6 & 7. *Circuit separation is being addressed in response to 10CFR50.48.
By CPCo letters dated March 19, 1981 and May 19, 1981, design information was submitted for proposed alternate shutdown capability for those instances where separation does not com-ply with 10CFR50 Appendix R req_uirements.
This information is currently under NRC review; and will not be further dis-cussed here.
Indication Requirement
- 1) one level channel per steam genera-tor
- 2) one wide range pressurizer pres-sure channel REQUIRED INDICATION FOR SAFE SHUTDOWN (pg 1 of 2)
Necessary Trans-mitter /Indicator and (or) Recorder la) steam generator E-50A:.
LT-0751 A, B, C or D/LI-0751
- A, B; C or D.
lb) steam generator 2a) 2b)
- E-50B:
LT0752A, B '* C or D/LI.,..0752 A, B, C or D PT0103/PI0103 fT0105A or B/
sub-cooled margin monitor Powe I' Supply
- 1) preferred panels Y-10, Y-20, Y-30
& Y -40 for chan-nels A, B, C & D, respectiv~ly 2a) panel YO-J.
2b) preferred panels Y-30 for PT0105A
& Y-40 for PT0105B Applicable Drawing (Attached)
- 1) E-78, M-311-07-16, M-311-07-18 2a) E-84-3, M-311-01-5 2b) E-84-6, M-311-01-6, M-311-01-6A Comments
- 1) All four channels of steam generator level are supplied by the preferred panels.
The range of these trans-mitters is 39.1-174.3"
- w. c.
It should be noted a that letter:
R.A Vincent W to D M Crutchfield (NRC),
dated 8/17/81, states in Item #26 that two wide range level channels are being installed per steam generator
- 2) The preferred wide range indicator PI0103 is sup-plied by the non-redundant YO~l supply.
The sub-cooled margin monitor is fed from the preferred supplies.
Although the sub-cooled monitor does not provide a direct pres~
surizer pressure readout, its sub-cooled pressure reading can be readily con-verted to a direct pres-surizer pressure.
The ranges for these instruments are:
PT0103- 0-3000 psi PT0105A&B 2500.psi
REQUIRED INDICATION FOR SAFE SHUTDOWN (pg 2 of 2)
Necessary Trans-Indication mitter/Indicator Power Applicable Reg,uirement and (or) Recorder Supply Drawing (Attached)
Comments
- 3) one wide range 3a) col cl leg lA:
3a}_ Y-10 3). E-96-2 3)_ All cold leg indicators temperature chan-.
'rEOlllA/TROlll 3b) Y-10 M-311-01-7, are fed by the pref erred nel per PCS cold M-311-01-13 supplies.
The range of leg 3b) cold leg lB:
3c) Y-20 these instruments is TEOlllB/TROlll 3d) Y-20 0-600°F.
3c) cold leg 2A:
TE0121A/TR0121 Jd) cold leg 2B:
e TE0121B/TR0121
!1 ) one wide range
- 4)
LT010i/LIC0101 4a) Y-10
- 4) E-82-1, 2
- 4) Multiple indication is channel of pres-A or B 4b) Y-20 available through the surizer level LT0101 and 0102 schemes.
The range of these instru-LT0102/LIC0102 a) Y-10 E-82-4 ments is 100.7" to 236".
A, B, c D b) Y-20 The range differs from the LT0103 scheme by applied c) Y-30 d) Y-40 density corrections.
All are fed by the preferred AC supplies.
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