ML20114C350
| ML20114C350 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/24/1985 |
| From: | Jens W DETROIT EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NE-85-0048, NE-85-48, NUDOCS 8501300209 | |
| Download: ML20114C350 (4) | |
Text
Q?yne H. Jeno Vko President
, Nuclear Gperationg Fermh2 6400 North Dixe Highway lSOn 013>s884150 Newport. Michigan 48166 January 24, 1985 NE-85-0048 Director of Nuclear Reactor Regulation Attention:
.Mr. B. J. Youngblood, Chief Licensing' Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555
~
Dear Mr. Youngblood:
Reference:
(1)
Fermi 2 NRC Docket No. 50-341 (2)
Detroit Edison letter to NRC, " Primary Containment Coatings Evaluation - Trans-mittal of Responses to Six Additional NRC Staff Questions", EF2-72045, dated January 10, 1985
Subject:
Primary Containment Coatings - Additional
)
Information
.As committed to in a January.ll, 1985 telephone conversation between Mr. G. Thomas (NFC-RSB) and Detroit Edison, the at-tachment documents Edison's responses to Mr. Thomas' queries.
As reflected in Reference 2, the information provided in both the attachment and Reference 2 will be incorporated in-to a future amendment of Report No. DECO-12-2191, "Evaluh-tion of Containment Coatings for Fermi 2."
Please direct any' questions to Mr. O. K. Earle at (313) 586-4211.
Sincerely cc: (* with attachment)
'Mr. P. M. Byron Mr. M._D. Lyngh*
Mr. G. Thomas i
USNRC Document-Control Desk Washington D.C.
2055S f
0 9
8501300209 850124
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s Attachment to NE-85-0048 11.
Are the Byron Jackson ECCS pumpa multistage?
' Response:
The RHR and core spray pumps are single stage, vertical, double suction, centrifugal pumps with a single' stainless steel impeller.
2.
If so, do they have interstage bushings lubricated by
- the pump. fluid?
The debris may cause bearing damage.
t -
Provide any_ test data from the pump vendor.
Response
Response to Question No. 1 indicates the pumps are not multistage.-
Edison does not_believe that there is a significant
^
-potential"for bearing damage due to debris.
The
~ Fermi2 ECCS pump bearings are protected with. mechan-ical seals..-During initial checkout and operation, and during system flushing, the Fermi'2 pumps had been, subjected-to, operation with_ debris, withi he t
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pumps being protected'only via"a-'su"ction side startup strainer to prevent pump. damage from larger objects.
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,' Post-operation inspection-of the pump and the seal-cyclones did not detect any particle or debris' accu-mulation.
The pumps performed in accordance with their acceptance criteria.
3.
With respect to the cyclone separator, what particle size can it block?
' Response -
i Core Spray and RHR_ pumps-are equipped with 1/8-inch size suction strainers at the suppression' pool..fThe 3 trainers-are provided to prevent particulates from entering-and potentially plugging the pump seal'
~
cyclone separator orifice.
The orifices for both.the ls
- CS. pumps and the RHR pumps have a diameter of^
O.140-inches..Since the cyclone' separator orifice-is of a' larger diameter.than the strainer mesh,-
9 particulates.which pass through the mesh will pass through_the.= orifice.Therefore, the cyclone a
-separator preventsLpotential seal. degradation by
. effectively removing from the mechanical seal cavity, F
those_ particles which pass through the suction
. strainer.
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4.
Indicate any instrumentation in the control room l
which would indicate blockage in the cyclone
[.
separator.
Response:-
Fermi 2 has no instrumentation in the control room
' directly indicating _ blockage of the cyclone separator.
Due to the fact that the cyclone separator orifice is larger than the mesh of the suction strainers, block-
- age is not anticipated.
Degradation or impairment of pump performance, however, can be observed by the operator in the control room via the following
?
information:
(a)
Pump seal failures are detected via the floor drain sump level indicators within the ECCS pump rooms, with alarms in the control room.
(b)
ECCS pump discharge flow rate is monitored and recorded in the control room.
5.-
- With respect to the core spray pumps, do they take suction from the condensate storage tank?
Response
The normal ECCS mode for the core spray system is to
[
take suction from the suppression pool.- However, under the Emergency Operating Procedures, the operator may align the valvas to take suction from the condensate storage tank'and inject ~either into
~
the reactor vessel'or the' suppression pool depending _
upon the need of core cooling, flooding or torus level restoration.
6.
Describe the provisions of your1EOPs for alternate system core' makeup, other than ECCS.
^
' Response _
The RPV level control guide of the EOPs for Fermi'2 provides the; operator with the,following~ options-for core cooling and level control:-
~
(a)
Normal feedwater through'use.of the electric-
, driven condensate and heater feed pumps taking suction from the condenser hotwell and injecting
-into_a--depressurized~ reactor vessel.
(b)
Continued' operation of the control rod drive
' water' pump,: injecting condensate into the RPV-
'via the control rod drives.
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(c)
Aligning the Standby Liquid Control (SLC) System in the test mode and injecting condensate from the SLC test. tank into the RPV.
(d)
Aligning the Core Spray System to take suction from the condensate storage tank and injecting into the RPV.
(e)
Utilizing the RHR to RHR-service cross tie and injecting water from the RHR reservoir into the reactor vessel via the RHR service water pump.
(Note that this is a last resort due to the
" dirty"' water from the reservoir.)
This option may also be used for containment flooding via the drywell and torus spray headers to avoid direct injection into the RPV.
In addition to those cooling mechanisms discussed above, two Ladditional options are available to the operators to assist core cooling.
(f)
Use of the Standby Feedwater System, utilizing the dedicated electric driven pumps, and injecting into the reactor vessel.
(g)
The fuel. pool cooling (FPC) system pumps aligned with the RHR pumps and heat exchangers.
In this mode, the FPC pumps take suction front the fuel pool skimmer tanks (with makeup provided via fire hose stations) and return the water via the RHR pumps and heat exchangers into the de-pressurized RPV or into the containmentias desired.
Ascahbeseenfromtheabovedescription,theoperators
~
have, great latitude'in, utilizing all available water sources onstte,' including the(hotwell, condensate storage tanks, RHR
~
reservoir and fuel pool.'
~.
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