ML20086R184
| ML20086R184 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/30/1974 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Goller K US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086R145 | List: |
| References | |
| 325-103174, NUDOCS 8402280723 | |
| Download: ML20086R184 (7) | |
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!!r. K. R. Coller, Assistant Director Scrial No. 325/103174 for Operating Reactors P06M/JTB:JMBjr :clw Directorate of Licensing Office of Regulation Docket Nos. 50-280 United States Atomic Energy Commission 50-281 Washington, D. C.
20545 License Nos. DPR-32 DPR-37
Dear Mr. Coller:
In response to your letter of October 31, 1974, Vepco has completed an analysis of the potential at Surry Power Station for flooding of safety related equipacnt f rom non-Category I (ceismic) sources.
Consideration was given to all systems mentioned in the aforementioned AEC letter as well as all other non-Category I systens having cc.pacitics suf ficient to cause failure of any safety related equipment.
The results of our review and proposed actions are described below.
Our review consisted of the following steps:
1.
Identification of all safety related targets arranged such that their redundancy could be affected by a flooding situation.
2.
Determination of the critical flood volumes which would result in the failure of these safety related targets.
3.
Identification of non-Category I flooding sources having capacities sufficient to provide the predetermined critical flood volumes.
'4h Determination, by onsite inspection, of flood spill paths, collecting areas, building low points, and interconnecting
-paths,of flooding between buildings.
5.
Evaluation of existing and proposed systems and structures intended to mitigate the effects of building flooding.
1 i
6.
Determination of the station modifications required to
(> I prevent failure of the identified tar;ets in a " worst 4)b I
case" flooding situation caused by rupture of a non-3 Category I source.
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Determination of temporary measures which would limit the effects of flooding during the interim while the recommended station nodifications are being made.
The following sunnarizes the results of our evaluation:
1.
The decontamination and fuel buildings drain via pipe tunnels without hold up to the auxiliary building; therefore, no targets were identified in this area.
2.
The charging pumps' cooling water pumps' motors were identified as the most limiting flood targets in the auxiliary building.
Tha flood volume required to ground these motors is approximately 135,200 gal.
3.
Various safety-related control cabinets in the relay roca were identified as the most vulnerable targets in the service building.
Because of the proximity of these vital controls to the floor of tbc service building, major flooding in this area could possibly affect safe shutdown.
4.
No additional targets were identified although consideration was given to the safeguards building, fire p' imps building and yard areas.
Safety related equipment in these spaces would not be affected by any reasonable flood sources due to flood water run-off considerations.
I i
The following non-Category I systems were determined to be the " worst case flood sources for cach of the targets identified above:
i 1.
The fire protection system emergency supply line for the spent fuel pit is normally isolated from the fuel building by a horizontal multimatic valve.
The only other non-i Category I source which would flood the fuel building is a two inch primary grade water branch line which would supply enough volume for this area in approximately 3.5, hours to begin flooding the pipe tunnel to the auxiliary building.
2.
No non-Category I flood sources were identified in the decontamination building which had sufficient capacity to cause failure of the auxiliary building targets.
As described above, the low point of the decontamination building has an unrestricted spill path to the auxiliary building.
1 3.
Of all the non-Category I systems considered, the fire protection system is the most limiting flood source in the turbine buildings because of the large volume of water available to the system. A rupture of the six-inch lines of the fire protection system running cast-west on the north wall of the turbine building above e
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-u[ Pus r = c.+ nw To tir. K. R. Coller l'a n c 3
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v the mezzanine icyc1 would result in flooding in the service building relay room.
As mentioned above, flooding in the service building is considered intolerable due to controls equipment arranger.cnt in the relay room, therefore, no grace time has been calculated for this type flooding.
4.
Of all the non-Category I systems, the fire protection system was determined to be the most limiting flood source which could result in failure of the auxiliary building targets identified above.
The fire protection system supplies the auxiliary building itself, as well as the main steam valve houses (safeguards buildings), which have unrestricted spill paths (via pipe tunnels) to the
~
auxiliary building.
The fire protection system could provide the critical flood volume for the auxiliary building in approximately 27 minutes.
The following station modifications will be Laplemented as a permanent means of mitigating the effects of flooding described above:
A 1.
Installation of water detection switches in the following locations:
a.
On the floor of the pipe tunnel which extends frem the fuel and decontamination buildings to the auxiliary building.
b.
At the 6 ft 10 in-elevation at the access to cach of the pipe tunnels which run from the main steam valve houses to the auxiliary building at the -3 ft 6 in, eleva tion.
f c.
On the floor of the pipe trench inside the relay room.
These switches would activate alarms in the control room to alert operators to a flooding condition.
2.
Alteration of the 24 inch dike presently being fabricated along the north wall of the turbine building (as shown in the attached drawings) to provide separation between the area surrounding the door to the relay room and the rest of the area enclosed by the dike.
3.
Installation of a flow directing pipe sleeve around the fire main above the turbine building mezzanine in the area'above the dikes described above for the purpose of diverting flooding to either end of the dike surrounded s
area.
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4.
Inspection of the fuel building by station personnel J
upon receiving a high sump level alarm in the control room.
We believe the above recommended station modifications would provide adequate grace time for operator action in the event of flooding under the conditions cpecified in the October 31, 1974 AEC letter to Vepco.
During the interim the following temporary measures will be taken at Surry Power Station, Unit Nos. I and 2, to guard against flooding:
1.
An inspection will be made and recorded of the charging pumps' cooling water pumps' area at the frequency of not i
less than three (3) times a shif t and an immediate in-spection will be made of the area if there is indication in the control room of a running fire pulap.
2.
An inspection of the relay room via a television monitor will be performed to detect flooding.
The relay room will be entered, inspected, and logged three (3) times a shift by station perconnel.
3.
An inspection of the fuel building by station personnel upon receiving a high sump 1cvel alarm in the control room will be conducted.
In addition, our analysis did not determine any case where the release cf chemicals from a non-Category I source could cause failure of safety related equipment.
The detailed design of the modifications described above are being finalized ~
end installation will be completed as soon as material availability and station conditions permit. The temporary measur,es have been implemented and will be terminated upon completion of the permanent modifications.
Very truly yours,
/
nM Vice Presidep(-) Power Supply
,v-C. M., tal ings and Production Operations Attachment O
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